Marina Feasibility Studies: Slip Demand, Dredging, and the Coverage Test That Fails

A marina feasibility study has to prove three things a lender cannot verify from a rent roll: that there are boats in the trade area that need the specific slips this marina has or proposes to build, that the revenue can be assembled from slip feet, rack spaces, fuel gallons and service hours rather than asserted, and that coverage survives the capital the docks, the basin and the seawall will actually consume over the loan term.

For the regulation itself, section by section, see our 7 CFR Part 5001 Handbook.

The third of those is where marina deals most often come apart, and it is worth stating up front. Marinas carry replacement capital obligations that are large, lumpy and unavoidable: a dredging cycle, dock and piling replacement, a seawall, a travel lift, a fuel system with a regulatory clock on it. Under the conventional coverage definition those obligations sit below the line and the deal looks comfortable. Under the definition USDA applies, they come out of EBITDA before the ratio is taken, and the same marina can move from covering to not covering without a single operating assumption changing.

This article sets out the feasibility half of a marina assignment. How the trade area is drawn on water rather than road. How slip demand is quantified from vessel registrations upward, and why it has to be done by length band rather than in aggregate. How the revenue build comes out of operational units. Which cost lines operators consistently understate. How coverage is tested under each programme, and which loan product the project should be routed to.

It then carries the appraisal analysis as the supporting half, because marina valuation turns on a question the feasibility study cannot answer on its own: what interest the owner actually holds in the ground beneath the docks.

What the study has to prove

Is there unmet demand for the slips this marina has? Not whether boating is popular, and not whether the market is short of slips in aggregate. Whether the trade area contains vessels in the specific length bands the subject can accommodate, in excess of the competing capacity able to serve them.

Can the revenue be built from units? Slip feet by band multiplied by rate per foot, rack spaces multiplied by turns, fuel gallons multiplied by margin, service hours multiplied by labour rate. A marina pro forma that presents a single blended revenue figure has concealed the only thing a lender needs to see, which is the mix.

Does the cost structure carry the capital? Including a dredging cycle whether or not the current owner has been funding one, dock and piling replacement on a component schedule, and an insurance line stressed rather than trended.

Does it cover under the definition that applies? And does it still cover when a dredging permit is delayed, a windstorm renewal doubles, or a submerged land lease resets at market.

The finding that changes the underwriting: the fleet outgrew the slips

The existing appraisal analysis on this site makes the point that permitted marina capacity is close to impossible to replicate, and that the permitted slip count is therefore closer to a licence than to a building. That is correct, and it is the reason marinas trade above what current income supports.

The feasibility-side version of that finding is sharper, and it is the one most market studies miss.

Slip inventory is not just fixed. It is fixed *in a configuration that was set decades ago for a smaller fleet*. Average vessel length has trended upward for a long period, with growth concentrated in the larger outboard and cruiser classes. `` Marina basins, finger piers and dock systems, meanwhile, were laid out when the fleet was shorter. The result is a market that can be simultaneously oversupplied and acutely undersupplied depending on where you cut it.

This is not a subtlety. It inverts the answer.

Consider a trade area with 4,750 competitive wet slips and rack spaces serving an addressable stored fleet of 4,200 vessels. Aggregate capacity is 113 per cent of demand. Reported that way, the market is overbuilt and the study should recommend against.

Now cut it by length band:

*Illustrative. Band shares must be built from the actual registration extract and the actual competitive slip census for the subject trade area.*

The same market is 34 per cent oversupplied in the smallest band and short by a factor of two in the largest. And the bands are not equivalent in revenue: slip rent is priced per linear foot, so a 50 ft berth earns roughly twice a 25 ft berth on length alone, before any premium for scarcity. The shortage is concentrated precisely in the bands that generate the most revenue per unit of basin.

A study that reports aggregate occupancy has told the lender the market is overbuilt when the opposite is true in the only bands that matter to the pro forma.

The corollary, and it is the practical instruction: the highest-return capital project at many existing marinas is not expansion, it is reconfiguration. Converting forty 28 ft slips into twenty 45 ft slips adds no permitted water area, requires no new authorisation in many cases beyond a dock reconfiguration approval, and moves revenue per square foot of basin materially. That is a project a feasibility study can evidence and a lender can underwrite, and it is invisible to any analysis run in aggregate.

Two supporting findings run the same direction and are worth stating because they redistribute where the NOI comes from:

Fuel is a traffic driver, not a profit centre. Per-gallon margins at the fuel dock are thin, and the line carries tank compliance, testing and eventual replacement capital. `` Fuel earns its place by drawing traffic that spends elsewhere, not by earning on its own.

The service yard frequently carries more NOI than the slip rent. Slip income is contracted and recurring, which is why it gets underwritten. Service labour, haul-out, bottom work and winterisation are higher margin, and at a full-service yard they can exceed slip-rent NOI outright. A credit assessed only on the rent roll has underwritten the safest income and ignored the largest.

Market and demand analysis

Defining the trade area

Marina trade areas are drawn on two axes at once, and both bind.

The landside axis is drive time from the vessel owner's residence. For an annual or seasonal slip holder who visits weekly, the practical catchment is tight. For transient and destination demand it is very wide and is not a drive shed at all.

The waterside axis has no equivalent in any other asset class. It comprises:

• Controlling depth in the approach channel and at the berth at mean low water. This sets the maximum draft the facility can serve and therefore caps the addressable fleet at the top end. A basin with four feet at low tide and one with twelve feet are in different businesses.
• Air draft under fixed bridges. A fixed bridge between the marina and open water removes the entire sailboat mast market and much of the flybridge market above its clearance, regardless of how deep the basin is.
• Distance to the inlet or open water. For offshore-oriented powerboats this is a primary rate driver. Two marinas fifteen minutes apart by road can be an hour apart by water.
• Lock and current constraints on river systems, and water level management on Corps-operated reservoirs, which can remove usable season entirely in a drawdown year.

These weight differently by marina type. Coastal saltwater facilities live on inlet distance, air draft and storm exposure. Inland lake and reservoir marinas have a trade area bounded by the water body itself, so the analysis is closer to a captive-market study, with water level as the structural risk. River marinas contend with current, flood stage and debris.

The practical instruction: draw the trade area as the intersection of the drive shed and the navigable shed. A boat owner forty minutes away by car whose vessel cannot clear the bridge is not in the market.

Quantifying slip demand from the ground up

The denominator is registered vessels, not population. Four steps, each of which should be visible.

Step one: registered vessels in the trade area counties. The federal roll-up is the US Coast Guard *Recreational Boating Statistics*, published annually and free. The state registries are more granular and often more current: Florida FWC, Michigan, Texas TPWD, Minnesota and Wisconsin DNR, California DMV vessel registrations. ``

Step two: screen to the addressable fleet. The overwhelming majority of registered vessels are small and trailerable, and they are not slip customers. Screen by length: broadly, vessels under 26 ft are predominantly trailered or home-stored, and the wet-slip and rack market sits above that. `` Then remove vessels stored at private residential docks, which in canal and waterfront-lot markets can be a substantial share.

Step three: split the addressable fleet by length band. This is the step that carries the analysis, for the reasons set out above. Aggregate demand is not actionable; banded demand is.

Step four: add transient and seasonal demand. Cruising traffic, seasonal migration on the Intracoastal and the Great Loop, and event demand. This is a different customer with different economics, priced per foot per night rather than per year.

Worked, on an illustrative coastal trade area:

Then banded as in the table above.

A note on ratios. Practitioners sometimes reach for a national constant, some number of slips per thousand registered vessels. I would not use one, and I would question a study that does. The share of the fleet needing a commercial berth varies enormously with the local mix of residential waterfront, trailer access, ramp capacity and storage alternatives. Derive the ratio locally from the competitive slip census and the addressable fleet, and state the method. A national ratio applied to a canal-front market with private docks on every lot will produce a demand figure with no relationship to anything.

Counting competitive supply

The census has to be built by hand and by band. Sources that make it tractable:

• Marinas.com and comparable directories for facility inventory, slip counts and amenity detail
• Dockwa and Snag-A-Slip for live availability and transient rate, which reveal what a directory will not
• State submerged lands lease registries, which show the preempted area each facility is authorised to occupy, and therefore the ceiling on what it can ever build
• USACE permit databases and public notices for what has been authorised and what is pending

Then canvass. Competing marinas will generally tell you their waitlist by size band, and the waitlist is the single most probative demand evidence available in this asset class. It is worth more than any secondary dataset, because it is the market saying what it cannot get.

The pipeline, and why it is usually empty

New in-water capacity requires, in most jurisdictions, some combination of USACE authorisation under Section 10 of the Rivers and Harbors Act and Section 404 of the Clean Water Act, a state submerged lands lease or consent, state water quality certification under Section 401, and coastal zone consistency review. The process routinely runs years and can be refused outright.

The consequence for a feasibility study is that the supply side is unusually predictable. Unlike self storage or multifamily, where a competitor can be under construction before your study is delivered, marina supply moves slowly and visibly. Check the permit databases and you have most of the pipeline.

The supply that does move is in the other direction. Waterfront land value in many markets exceeds marina income value, and facilities are converted to residential or mixed use and lost. A supply analysis should look for that specifically, because a competitor under contract to a residential developer is capacity leaving the market on a known date, and it is the most supportive single fact a projection can carry.

Institutional capital has noticed. The sale of Safe Harbor Marinas by Sun Communities to Blackstone Infrastructure, announced at approximately $5.65 billion, is the clearest evidence that the asset class is now being priced as infrastructure rather than as leisure real estate. `` Consolidation has professionalised revenue management across the sector, which matters to a feasibility study in a specific way: the competitive set a new entrant faces is increasingly operated by parties who price to demand rather than to habit.

Capture and penetration

Penetration is the subject's share of total trade area slip demand. Capture is its share of the competitive set it actually sits in, meaning its length bands, its draft and its service level.

For marinas, capture must be computed band by band. A subject with 350 slips of which only 40 exceed 40 ft does not capture 8 per cent of the 40 ft-plus market because it holds 8 per cent of the slips. It captures whatever 40 of 350 large-slip spaces in the market represents, which on the illustrative census above is 11.4 per cent, in a band where demand exceeds capacity by 68 per cent and the constraint is absolute.

Cross-check by a second route. Against the waitlist canvass: if competing facilities report multi-year waits above 40 ft and none below 34 ft, the banded capture assumption should reproduce that pattern. If the study's capture assumption implies the subject fills its small slips first, it contradicts the market evidence and one of the two is wrong.

The revenue build

Slip and rack rental

Slip rent is priced per linear foot, and the rate per foot generally rises with length rather than staying flat. Build the line band by band:

• Slips by band, multiplied by feet per slip, multiplied by rate per foot, multiplied by occupancy by band

Never a blended rate. A blended rate makes the small-slip vacancy invisible and prices the large-slip scarcity at the average, which is the arithmetic equivalent of the aggregate-occupancy error described above.

Contract structure differs by geography. Northern markets sell a season; southern markets sell annual contracts. The distinction matters for the ramp, since a seasonal market has one selling window a year and a missed window costs twelve months.

Dry stack is priced per rack space or per foot, generally bundled with unlimited in-and-out launch service. Its economic feature is that it converts a scarce horizontal resource into a vertical one, storing far more boats on far less waterfront, and its return on invested capital can exceed wet slips as a result. ``

The constraint on dry stack is not rack capacity. It is launch throughput. A rack building can be fully leased and still fail to deliver, because on a peak Saturday the forklift cycle, the staging apron and, in tidal locations, the launch window cap how many boats can actually get in the water. A dry stack pro forma that sells 300 rack spaces without a throughput calculation has sold a service it cannot deliver, and the churn shows up in year two. Model the peak-day launch capacity explicitly: cycles per hour, hours of peak demand, staging space, and what happens when two forklifts become one.

The other businesses

Transient dockage. Priced per foot per night, at a substantial premium to the nightly equivalent of an annual slip. Small at storage-oriented marinas, large at destination facilities. ``

Fuel. Gallons multiplied by margin per gallon. Treat as a traffic driver, as above. The capital and compliance load, tank testing and eventual replacement, belongs in the reserve schedule rather than being netted against a thin margin.

Service yard. Labour hours multiplied by billed rate, plus haul-out and launch priced per foot, plus materials. Commonly $500,000 to $3 million in annual revenue at 25% to 35% gross margin. Build it from bay capacity, technician headcount and billable utilisation, not from a percentage of slip revenue. The binding constraint is usually technicians, not demand.

Ship's store, parts and supplies. Commonly $200,000 to $800,000 at 30% to 40% gross margin.

Boat sales and brokerage. Highly variable, often $1 million to $5 million at 10% to 20% gross margin. Transactional and cyclical. It should not be projected as a trend line and, as the appraisal section notes, it should not be capitalised as though it were recurring.

Restaurant and bar. Where leased, rental income. Where operated, a restaurant business inside a marina, carrying restaurant margins and restaurant risk.

Boat clubs and rental fleets. Membership-access operators occupying slips or rack space generate storage revenue plus material service pull-through from a hard-used fleet, and they fill off-peak utilisation. Underwrite the club as a tenant with concentration risk, because it is one counterparty holding a block of spaces.

Winter and indoor storage. In northern markets, shrink-wrap, winterisation and inside storage partially offset the closed season and should be modelled as its own line with its own capacity constraint.

Ramp and absorption

Reconfiguration and expansion at an existing marina with a waitlist absorbs fast, and the waitlist canvass is the evidence. This is the most underwritable growth story in the asset class.

New-build capacity absorbs over multiple seasons and, in seasonal markets, absorption happens in windows rather than continuously. Model monthly, and place the openings against the selling season rather than against the construction completion date. A marina that finishes its docks in August in a northern market has missed the year.

Repositioning an underperforming facility has a longer rate ramp than volume ramp, because the discounted slip holder acquired to fill the basin does not become a full-rate customer on schedule.

Seasonality and the working capital trough

Northern marinas concentrate revenue into a compressed open-water season with a winter storage tail. Southern marinas earn more evenly but carry a summer storm exposure that is its own kind of seasonality.

Distribute revenue and cost monthly. Fixed costs, insurance, debt service and a retained core crew continue through the closed season while slip revenue does not. The working capital requirement is set by the cash trough, not the annual result, and a marina credit sized on the annual number will draw its line in the first winter. Put the monthly curve in front of the credit committee with the trough marked.

Cost structure: the lines operators understate

Dredging. The classic understated line and the most common acquisition surprise. Sedimentation is continuous in most basins and channels, and the obligation is real whether or not the current owner has been funding it. Cost is driven less by volume than by spoil disposal and dewatering, and by whether the material is contaminated. Permitting can take a year or more. A feasibility study must carry a dredging cycle and an annualised accrual even where the seller's accounts show nothing, and should confirm that a dredging permit is obtainable rather than assuming it. A marina that cannot dredge loses capacity gradually and permanently. ``

Named-storm and windstorm insurance. In Florida, the Gulf and the Carolinas this has become a step-change cost rather than an inflation line, with large named-storm deductibles that leave a facility effectively self-insured for the first tranche of a loss. Stress it, do not trend it. ``

Submerged land lease payments and reset risk. States charge for use of sovereign submerged land, typically as a fee per square foot of preempted area, a percentage of wet slip revenue, a per-slip charge, or the greater of these, with periodic escalation. Florida administers this through the Board of Trustees and DEP under Chapter 18-21 of the Florida Administrative Code; Texas, New York and Michigan operate their own bottomlands regimes. `` The underwriting item is not the current payment. It is the reset: a lease that renews at market can move a cost line by a multiple, and a lease that does not renew impairs the going concern outright.

Dock and piling replacement. Dock systems have finite lives, shorter in high-energy saltwater environments, and replacement is priced per linear foot or per slip. Deferred dock replacement is the second most common hidden liability after dredging.

Seawall and bulkhead. Long cycle, very large cost, catastrophic failure mode. It belongs on the component schedule even when the current condition is sound.

Travel lift or marine railway. The haul-out equipment is what makes the service yard possible. Its replacement is a large capital event and its downtime removes the highest-margin revenue line.

Shore power upgrades. Larger vessels draw more power, so the same trend that creates the large-slip opportunity creates an electrical capital requirement. Upgrading pedestals and dock service is a real cost attached to the revenue upside and should be paired with it in the model rather than omitted.

Environmental compliance. Stormwater permitting, state Clean Marina programme requirements, spill prevention, pump-out provision, and fuel system testing with eventual tank replacement on a regulatory clock.

Labour. Staffing scales with service intensity. A storage-only marina is lean; a full-service yard is labour-heavy and its constraint is finding technicians, which in many markets is binding and is a legitimate reason to discount a service revenue projection.

Replacement reserves, built from components

A percentage-of-revenue reserve does not work for marinas, and the reason is arithmetic rather than principle. The component obligations are too large and too unevenly spaced for a token accrual to fund them.

``

Build the schedule, annualise it, and compare to whatever the seller's accounts show. The gap is usually large, and it is the number that decides the deal under the USDA coverage test.

Coverage and sensitivity

Two definitions, and the gap between them

Under conventional and SBA practice, coverage is EBITDA over total debt service. SBA underwriting has centred on a minimum of 1.15 times. ``

Under USDA's rule at 7 CFR Part 5001, replacement capital expenditure is deducted from EBITDA before the ratio is taken.

For most asset classes the difference is a rounding item. For marinas it is decisive, because the component schedule above is enormous relative to EBITDA.

*Illustrative, and the point is the structure rather than the figures.*

The same marina covers comfortably under one definition and fails under the other. Nothing operational changed. The only variable is whether the capital the docks and the basin will certainly consume is recognised before the ratio or after it.

Two practical consequences. First, route the deal with the coverage definition in mind from the beginning, because discovering this during underwriting means restructuring rather than adjusting. Second, a marina pro forma with a thin reserve is not conservative, it is wrong, and it will be corrected by the lender at the worst possible moment.

``

Sensitivities that mean something for marinas

A dredging event pulled forward. Not a percentage. Model the permit taking eighteen months instead of six and the disposal classification coming back contaminated. This is the asset class's characteristic shock and it has a real probability.

Insurance renewal at a multiple. In windstorm-exposed markets, test the renewal rather than the trend, and test the year in which a named-storm deductible is actually consumed.

Submerged lease reset at market. Where the lease renews inside the loan term, this is not a sensitivity, it is a scheduled event with an unknown value, and the study should say so.

Slip mix. Test the projection with the large-slip premium removed and the small slips at their actual band occupancy. If the deal only works because the top two bands fill at full rate, the credit is a bet on the length distribution holding.

Storm season with a lost quarter. A direct hit removes docks, a season of revenue, and the transient business simultaneously, while the rebuild consumes the reserve. Model the compound effect rather than a revenue haircut.

Fuel margin compression and technician vacancy, each of which caps a revenue line independently of demand.

Break-even stated as slips

The most useful single output is not a table. It is: the marina covers at 1.00 times with 214 of its 280 slips occupied at contract rate, and at 1.15 times with 238. That is a number a harbourmaster can check against the dock plan in March and know whether the year is working.

Compute it band by band, because occupancy is not fungible: 238 slips filled from the bottom of the length distribution does not produce the same revenue as 238 filled from the top.

Programme routing

SBA 7(a). Suits going-concern acquisition, partner buyout, working capital and refinance up to the programme maximum. Marinas sit on SBA's special purpose property list, which brings going-concern appraisal treatment, business-value allocation and heightened collateral scrutiny, and makes a third-party feasibility study likely. ``

SBA 504. Often the better structural fit for marinas, because the programme funds long-lived fixed assets and a marina is unusually fixed-asset heavy. Docks, seawalls, dry stack buildings and haul-out equipment are the kind of long-lived improvement the debenture structure is designed for. It does not fund working capital, which in a seasonal marina is a genuine gap requiring a separate facility. ``

USDA Business and Industry under 7 CFR Part 5001. Underused for marinas and worth checking early, because the rural population threshold opens more often than sponsors expect. A great many marinas sit on inland lakes, river systems and rural coastline in communities well under the threshold. Loan sizes exceed 7(a). An independent feasibility study is required for new businesses. The stricter coverage definition applies, which is the trade. ``

USDA Community Facilities. Relevant where the borrower is a public body, non-profit or tribe, which in this asset class means the municipal marina and public boating access facility. Eligibility for a boating facility as an essential community facility requires checking against current definitions, and the Direct and Guaranteed programmes are governed separately and are not the same test. Determine this before scoping a municipal project. ``

Conventional and specialty. Banks active in marina lending generally want a demonstrated operator, conservative leverage and a coverage cushion above the SBA floor, and increasingly treat the facility as a business credit with real estate support. Infrastructure and private equity capital now competes at the portfolio level, which affects exit assumptions in a way it did not five years ago.

When a third-party feasibility study is required

• Start-up or new construction with no operating history
• Change of use, repositioning, or a material change in the operating model
• Special purpose property, which marinas are
• Projections not supported by historical operations
• The lender's own credit policy, independent of any agency requirement

Independence is the operative test rather than the label. A study prepared by a party with an interest in the transaction closing is not a third-party study whatever the cover page says.

Where marina projects fail

Dredging discovered after closing. The single most common failure. A deferred obligation, an unobtainable permit, or contaminated spoil that multiplies the disposal cost.

Slip mix mismatched to the fleet. Small slips vacant, a waitlist above 40 ft the marina cannot serve, and a projection built on aggregate occupancy that never identified the problem.

Dry stack throughput bottleneck. Racks sold, boats not launchable on peak days, churn in year two.

Permitting delay on expansion. The Section 10 and 404, submerged lands, 401 and coastal consistency stack running years past the construction schedule and past the loan's interest reserve.

Storm loss against a large deductible. Docks destroyed, a season lost, the reserve consumed, and coverage gone for two years.

Submerged lease reset or non-renewal. The cost line moves by a multiple, or the going concern is impaired outright.

Fuel treated as a profit centre. Staffed and stocked accordingly, losing money on a thin-margin line carrying compliance capital.

Brokerage income projected as a trend. Transactional, cyclical revenue underwritten as though it were contracted.

Working capital sized on the annual result. The first closed season, every time.

Technician vacancy capping the service yard. The highest-margin line constrained by labour supply rather than demand, which no market study addresses unless it looks.

The bottomland interest never established. Which is where the appraisal takes over, and where the most expensive discovery in marina lending is made.

What the appraisal will test

The feasibility study establishes whether the operation covers. The appraisal establishes what the asset is worth, and in marinas that turns on a question with no counterpart in other asset classes.

Three things at once

Most special-purpose properties combine real estate with an operation. A marina adds a third element that no other asset class carries in the same form: a regulated right to use land the owner may not own.

The physical asset is straightforward enough to list: upland acreage, docks and piers, a dry-stack storage barn, a fuel system, haul-out equipment, and typically a building or two for service bays and a ship's store.

The ownership structure underneath it is not. Some marinas sit on land held entirely in fee. Many sit partly on submerged land leased from a state or a municipality under a long-term agreement, and that distinction is the first thing to establish in any marina assignment.

Treat a marina as ordinary income-producing real estate and the number will be wrong, because the entitlements frequently move value more than the improvements do.

The submerged land question comes first

This is where marina appraisal genuinely diverges from everything else in commercial valuation.

What interest does the owner hold in the bottomland? Fee simple, a long-term state or municipal lease, a licence, or some combination across different portions of the property.

If leased, what are the terms? Remaining term, renewal rights, rent and rent escalation mechanism, permitted uses, and the item that matters most in practice, assignability on sale.

Submerged-land lease assignability issues derail deals during due diligence with enough regularity that it should be treated as a primary diligence item rather than a technicality. A marina whose slips sit on bottomland under a lease that requires state consent to assign, or that has a short remaining term, is a materially different asset from one held in fee.

The valuation consequences are direct. A lease with fifteen years remaining and uncertain renewal supports a different value from a ninety-nine year lease or a fee interest, and the difference is not a footnote. It is a leasehold versus fee simple distinction affecting the entire income capitalisation.

State frameworks for conveying or leasing bottomland vary considerably. Some states have codified formulas for determining consideration on conveyance, distinguishing filled from unfilled bottomland and directing that due consideration be given to riparian rights in establishing value. Others lease only, on standardised terms. The applicable regime is jurisdiction-specific and it is not optional reading.

Riparian and littoral rights, the rights attaching to land bordering water, sit alongside this. They govern access, wharfing out, and in some jurisdictions the extent of permitted structures. They are part of the legally permissible test in highest and best use, and they can be the constraint that determines what the site can ever become.

Permitted capacity is the asset

Marina real estate frequently appraises at a higher value than operating cash flow alone would support. Buyers pay for the impossibility of replicating permitted waterfront capacity.

New marina permitting is difficult, slow and in many jurisdictions effectively unavailable. Environmental review, dredging permits, habitat protection, and public trust doctrine constraints combine to make additional slip capacity something that largely cannot be created. What exists is what there is.

So an existing permitted slip count is closer to a licence than to a building. It has scarcity value independent of the cash flow it currently produces, and a marina operating below its potential still holds capacity a competitor cannot build.

The appraisal implication is a genuine analytical tension. An income approach anchored to current operations may understate a facility whose permitted capacity is under-exploited. But a value materially above income support requires explanation: what specifically is the scarcity, how is it evidenced in the market, and would a buyer actually pay for it.

The underlying real estate commonly represents 40% to 60% of total marina transaction value, with premium coastal upland trading in the range of $200 to $500 per square foot, plus the value of the submerged land interest.

The physical constraints that cap value

Marina capacity is limited by physical facts that cannot be engineered away, and each one belongs in the site analysis.

Water depth at low tide, the draft, determines the size of vessel the facility can accommodate. A marina with four feet at low tide serves a different and much smaller market than one with twelve.

Slip length and turning radius. Slips are the water spaces between piers, and their dimensions cap vessel size independently of depth. Larger vessels pay substantially more per foot, so slip configuration drives revenue mix directly.

Dredging obligations: whether the basin and channel require periodic dredging, at what cost and interval, and whether permits for it are in hand. A recurring dredging obligation is a capital item that must appear in the reserve analysis, and a marina that cannot obtain a dredging permit faces gradual loss of capacity.

Protection: exposure to storm, wave, wind and, in northern markets, ice. Breakwaters, bulkheads and basin configuration all affect both operating risk and insurance cost.

Flood zone, wetlands and marsh designation, which constrain what can be built and rebuilt.

Parking, a genuine constraint that is frequently overlooked. Older guidance suggested ratios of 1.5 to 2.5 cars per slip; contemporary practice runs closer to one space for every two slips. A facility short of parking is capacity-limited on land regardless of its water capacity.

Utilities to the docks, meaning power, water and pump-out, which determine what class of vessel the facility can serve.

Wet slips and dry stack

The two storage modes have different economics and should be modelled separately.

Wet slips keep the vessel in the water. Revenue per slip is a function of length, and the slip occupies waterfront that cannot be replicated.

Dry stack stores vessels indoors on racks, launched on demand by forklift. The critical economic feature is that dry stack allows an operator to store far more boats on far less waterfront: it converts a scarce horizontal resource into a vertical one.

That has real valuation consequences. A property with dry stack capacity, or with entitlements permitting its construction, holds an expansion option that a wet-slip-only facility does not. Conversely, dry stack is a building. It carries construction cost, maintenance and functional obsolescence in a way that docks do not.

The three approaches

Income is generally preferred, and for a full-service facility it is the only approach capable of handling the revenue mix. The discipline is separating recurring contracted income from transactional income, and reflecting that difference in either the capitalisation rate or the structure of the analysis.

Sales comparison conventionally uses price per slip as the unit of comparison, with price per linear foot as an alternative that better accommodates differences in slip size. Both require adjustment for the elements that drive marina value: draft, protection, upland area, dry stack, service capability, and above all the nature of the submerged land interest.

Comparables are scarce. Marinas transact infrequently, and a genuinely comparable sale, similar market, similar draft, similar tenure, may not exist within a useful radius.

Cost approach has a specific complication. Land can represent as much as 80% of total value in a marina, and that land value is difficult to establish directly, frequently requiring extraction from improved sales. Once land dominates the value conclusion, the cost approach becomes largely a land valuation exercise with a depreciated improvement addendum.

Highest and best use, and the bulkhead question

Marina highest and best use analysis carries a technical wrinkle worth knowing, because appraisers genuinely differ on it.

When valuing the site as though vacant, do you assume the bulkhead and docks exist?

Practice varies. The argument for assuming they exist is practical: many regulatory agencies no longer permit new bulkheads, on ecosystem grounds. If the analysis assumes a genuinely vacant, unimproved shoreline, it is assuming a site that could not be developed as a marina at all today, which produces a land value bearing no relation to what the market would pay.

The more defensible position, and the one the specialist literature suggests, is that highest and best use as vacant should include the bulkheads and piles, because they represent entitlements and physical works that cannot be recreated rather than ordinary improvements.

Whichever position the appraiser takes, it should be stated and reasoned rather than left implicit, because it moves the land value substantially and a reviewer will want to know which assumption was applied.

Capitalisation rate selection

This is where the largest single errors occur. Cap rate misapplication alone can cost a seller between $500,000 and $2 million on a mid-market marina transaction.

The reasons it goes wrong are specific to the asset class.

Applying a general commercial rate. Marinas are not retail, not industrial and not hospitality, and borrowing a rate from any of those misprices the risk.

One rate across all income streams. Contracted slip income and boat brokerage income do not carry the same risk and should not carry the same rate.

Ignoring tenure. A leasehold interest in bottomland with a finite term requires different treatment from a fee interest, and a rate applied without reference to the lease has ignored the property's largest structural feature.

Ignoring scarcity. Where permitted capacity genuinely cannot be replicated, market participants price that, and a rate derived from replicable assets will not reflect it.

Where marina appraisals go wrong

• Submerged land interest not established, or assignability not confirmed.
• Draft and slip dimensions not analysed, so the vessel market the facility can actually serve is never established.
• Revenue streams aggregated into one NOI with one rate.
• Dredging obligations omitted from the reserve analysis.
• Parking constraint missed.
• Comparables adjusted on price per slip without adjusting for slip size, draft or tenure.
• Highest and best use as vacant left ambiguous on the bulkhead question.
• Boat brokerage income capitalised as though it were recurring.

What a lender is reading for

On the feasibility side

• Is the trade area drawn as the intersection of the drive shed and the navigable shed, with draft and air draft applied?
• Is slip demand built from vessel registrations, screened to the addressable fleet, and split by length band?
• Is competitive supply censused by band rather than in aggregate, and does it include the waitlist canvass?
• Does the capture assumption reproduce the waitlist pattern the market actually shows?
• Is revenue built per linear foot by band rather than blended, and is dry stack constrained by launch throughput rather than rack count?
• Is the service yard built from bays, technicians and utilisation rather than as a percentage of slip revenue?
• Is there a dredging cycle in the model whether or not the seller funded one?
• Is the replacement reserve built from a component schedule?
• Is coverage tested under the definition that applies to the programme being used?
• Is break-even stated as slips occupied, by band?

On the appraisal side

• Who owns the bottomland, and if it is leased, is the lease assignable and how long does it run? This is the first question and it can be dispositive.
• What is the permitted slip count, and can it be expanded? Permitted capacity is the scarce asset.
• What is the draft at low tide, and what vessel market does that serve?
• Are the revenue streams separated, with recurring income distinguished from transactional?
• Is there a dredging obligation, and is it funded?
• Does the capitalisation rate reflect the tenure and the risk mix, rather than a generic commercial rate?
• Does the value conclusion exceed what income supports, and if so, is the scarcity argument evidenced rather than asserted?

Marinas reward specialist analysis more than almost any asset class, because the value drivers, a lease with a state agency, a permitted slip count, four feet of water at low tide, are not visible in a rent roll and do not appear in a generic income model. The Appraisal Institute publishes a dedicated text on the subject, which is itself an indication that the asset does not fit the standard framework. The feasibility side has the same character: the number that decides the deal is usually the one nobody put in the projection.

For the cross-asset framework, demand regimes, valuation methods and reviewer tests, see the 2026 Feasibility Methodology Atlas.

Frequently asked questions

Does an SBA loan for a marina require a feasibility study?

Marinas sit on SBA's special purpose property list, which raises the likelihood substantially. The requirement most commonly attaches on start-up or new construction, on a change of use or operating model, where projections are not supported by historical operations, or under the lender's own credit policy. Confirm against the operative SOP at the date of application.

How is slip demand calculated for a marina feasibility study?

From vessel registrations rather than population. Count registered vessels in the trade area counties, screen out the small trailerable fleet and boats stored at private residential docks, then split the addressable remainder by length band. The banding is not optional: aggregate demand routinely shows a surplus in the same market that has an acute shortage above 40 ft.

Why do marina deals fail the USDA debt service coverage test?

Because 7 CFR Part 5001 deducts replacement capital expenditure from EBITDA before the ratio is taken, and marina replacement capital is unusually large. Dredging, dock and piling replacement, seawall and haul-out equipment together can consume enough EBITDA to move a marina from comfortable coverage under the conventional definition to below 1.00 under the USDA one, with no operating assumption changing.

Can a marina be financed through USDA?

More often than sponsors expect. The rural population threshold opens for a great many inland lake, river and rural coastal marinas. Business and Industry is the usual route for private borrowers. Community Facilities applies only to public bodies, non-profits and tribes, so it is the municipal marina route, and eligibility for a boating facility has to be checked against current essential community facility definitions.

Which marina costs are most often understated?

Dredging first, because the obligation exists whether or not the current owner has funded it and the cost is driven by spoil disposal rather than volume. Then named-storm insurance, which is now a step-change cost in windstorm-exposed markets rather than an inflation line. Then submerged land lease reset risk, dock and piling replacement, and shore power upgrades tied to serving larger vessels.

Is it better to expand a marina or reconfigure the slips?

Frequently reconfiguration. Converting a block of small slips into fewer large ones adds no permitted water area and often needs no new in-water authorisation, yet it moves revenue per square foot of basin materially, because slip rent is priced per linear foot and the shortage is concentrated in the largest bands. Expansion requires the full permitting stack and can take years or fail outright.

*Prepared by UnionMetric Appraisal & Feasibility. Submerged land tenure, riparian rights and permitting are governed by state and local law and vary substantially by jurisdiction; nothing here is legal advice. Revenue and margin ranges reflect published sources at the date of writing and are planning references rather than substitutes for property-specific analysis. Last updated: 2026-07-31.*

*Feasibility methodology, demand arithmetic, reserve component schedules and worked examples in this article are illustrative planning frameworks and require calibration to the subject market and facility. Loan programme parameters change by fiscal year and should be confirmed against the operative agency guidance at the date of application.*