SBA Loans for Car Washes: 7(a) and 504 Eligibility, the Equipment-Real Estate Split, and Membership Revenue in the Credit Memo

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  Express car wash rinse cycle, an SBA-financed special purpose business built on membership revenue

In 2025 the private-equity car wash model broke in public: a top-ten chain filed for bankruptcy, the largest automotive services company sold its entire U.S. wash division at a loss, and the industry's benchmark operator agreed to leave the stock market. The single-site operator with an SBA loan did not break. Here is how the SBA finances a car wash, where the 7(a) and 504 programs split the project, what a tunnel costs to build in 2026, and how a lender reads a membership base that now produces four-fifths of wash revenue.

Three transactions define the car wash industry's last eighteen months. In February 2025, ZIPS Car Wash, one of the largest privately held chains in the country, filed for Chapter 11, agreed with its lenders to cut roughly $279 million of debt, took in $15 million of new capital, rejected the leases on 41 locations, and sold sites to competitors, including six in Orlando for $50 million. On April 10, 2025, Driven Brands completed the sale of its U.S. car wash business to Whistle Express for $385 million, $255 million in cash and a $130 million seller note it later sold for $113 million, and reported the whole division as discontinued operations. And in February 2026, Mister Car Wash reported its first billion-dollar year, 548 locations, nearly 2.3 million Unlimited Wash Club members and 79 percent of wash sales from subscriptions, then cancelled its 2026 outlook because it had agreed to a transaction with its longtime private-equity sponsor, Leonard Green & Partners.

Read together, those are the story of a development machine that outran demand, not of a business that stopped working. Loan Analytics' reading of the SBA's loan-level files, published on this site in August, makes the same point from the other end of the market: car wash loans have charged off at 5.25 percent against 7.45 percent for all industries, and new openings had already fallen by roughly 40 percent before the first bankruptcy made headlines. The economics of the sector are covered in this site's car wash bubble analysis, its membership monetization benchmark and its throughput study. This is the loan page: how the SBA treats the asset, where the two programs divide a project, what it costs to build in 2026, and what a credit memo does with membership revenue.

Eligibility, and the label that changes the equity

A car wash is an operating business under SBA rules, which puts it on the eligible side of the line that excludes landlords. What sets it apart is a single word on a list. SBA's Standard Operating Procedure 50 10 8, effective June 1, 2025, enumerates "car wash businesses" among Limited or Special Purpose Properties, alongside gas stations, hotels and funeral homes. The label carries three consequences.

The first is equity. In the 504 program the base borrower contribution of 10 percent of project cost rises to 15 percent for a special purpose property and to 20 percent where the project is both special purpose and a new business, under 13 CFR 120.910. On a $5 million tunnel, a first-time operator brings $1 million instead of $500,000.

The second is valuation. "When the collateral is a Special Purpose Property, the appraiser must be experienced in the particular industry." Where a going-concern value is sought, the appraiser "must have completed no less than four going concern appraisals of equivalent special use property as the property being appraised, within the last 36 months," and must allocate separate values to land, building, equipment and the business. For an acquisition, if the amount financed less the appraised real estate and equipment exceeds $250,000, or if buyer and seller are related, "and the business operates from a Special Purpose Property, the Lender must obtain an independent business valuation performed by a Certified General Real Property Appraiser."

The third is scrutiny. Among the circumstances in which the SOP says SBA may request a feasibility study are "market saturation by industry type and location" and "highly specialized Project property." A new express tunnel in a corridor that already has three meets both descriptions on its face.

The rest of the framework is the standard one. Repayment must come from the business: the debt service coverage ratio "must be equal to or greater than 1.15 on a historical and/or projected cash flow basis and 1:1 on a global basis," and for a start-up or construction project the projections must reach 1.15 "within 2 years from loan funding or, for construction projects, within 2 years from the end of construction." A start-up injects at least 10 percent of total project cost; every 20 percent owner guarantees.

Where 7(a) ends and 504 begins

The two SBA programs divide a car wash project along the useful life of what is being financed, and understanding that line is most of the structuring work.

The 504 program finances fixed assets: land, the building, site work, canopies and vacuum stalls, and "long-term machinery and equipment." Its debentures run 10, 20 or 25 years under 13 CFR 120.933, and machinery financed with a 504 debenture must have a remaining useful life that supports the term, which in practice means ten years or more. A tunnel's conveyor, wraps, arches, dryers and water reclamation system meet that test; the point-of-sale gates, controllers, software and signage generally do not. The 504 debenture is capped at $5 million ($5.5 million for small manufacturers and certain energy projects), sits in second position behind a bank's first lien of roughly half the project, and does not fund working capital, chemicals, inventory or soft costs.

The 7(a) program finances everything, up to a $5 million gross loan: real estate on a 25-year term, equipment on up to 10 years or its useful life, and working capital, start-up chemicals, technology and franchise fees on shorter terms. It is one loan from one lender, which is why smaller projects and acquisitions of existing washes tend to use it. Above $500,000 the lender must take available collateral, including a lien on the real estate, to the extent needed to fully secure the loan, and the SOP values improved real estate at no more than 85 percent of market value for that purpose.

The practical split on a ground-up express tunnel is therefore: land, building, site work and the long-life tunnel equipment into a 504 structure at 20 or 25 years for the real estate and 10 years for the equipment, with the special-purpose equity injection; and short-life equipment, technology, chemicals, opening inventory and working capital into a 7(a) loan or the bank's first lien. The dividing line that shapes the split is the useful-life test on one side and the 504 program's fixed-asset-only limit on the other.

One change arrives on October 1, 2026 for buyers of existing washes. SOP 50 10 8.1, issued August 14, 2026, applies to applications assigned an SBA loan number on or after that date and rewrites change-of-ownership lending: lender summaries of the new appendix describe a 1.25 debt service coverage floor for first-time acquisitions, measured on historical or adjusted earnings rather than post-closing projections, and a lender-ordered quality of earnings report where the business purchase price is $3 million or more, excluding owner-occupied real estate. A buyer of a $4 million operating tunnel who files in September is underwritten under the June 2025 rules; a buyer who files in October is not.

What a tunnel costs to build in 2026

The reason the equipment-real estate split matters is that the numbers have moved past the 7(a) ceiling. A car wash construction contractor's 2026 breakdown puts the equipment alone for a conveyor tunnel at $1.4 million to $2.1 million, a complete project at $2.6 million to nearly $7 million, and a 120-foot tunnel commonly at $3.5 million to $8 million or more depending on market and features. A national design-build contractor's regional table for a standard 120-foot express tunnel with 25 or more vacuum stations, excluding land, runs $2 million to $5 million in the Southeast and Texas, $2.5 million to $6 million in the Midwest, $3.5 million to $7 million or more in the Northeast and $4 million to $10 million or more on the West Coast, with land adding $500,000 to $2 million in most suburban markets and more than $4 million on the West Coast. The same source notes that Section 232 tariffs of 50 percent on steel and aluminum have raised the cost of the tunnel shell, the vacuum canopies and the mechanical infrastructure. Permitting adds two to six months, especially for water discharge, and the calendar from land acquisition to opening runs 12 to 24 months.

At those figures a suburban express tunnel on purchased land is a $4 million to $8 million project. The 7(a) program's $5 million gross loan covers a secondary-market tunnel on inexpensive land and little else; the corner-lot suburban tunnel that the consolidators built by the hundred is a 504 structure or a conventional loan. That is the arithmetic behind the site's earlier finding that SBA-financed washes have performed better than the industry: the program's ceiling kept its borrowers out of the most expensive sites.

Membership revenue in the credit memo

The subscription model is now the industry's revenue base. Mister Car Wash reported that Unlimited Wash Club sales were 79 percent of total wash sales in the fourth quarter of 2025, up from 75 percent a year earlier, with membership up 7 percent to nearly 2.3 million and comparable-store sales up 2.9 percent for the year. A single-site operator's membership share will be lower, but a stabilized express tunnel without a majority of revenue on subscription is now the exception.

The SOP has no paragraph on membership revenue. What it has is the rule that projections must carry "the supporting assumptions," including "justification for revenue growth" and "a comparison to current industry trends," and the rule that the analysis "must support and justify the reasonableness and attainability of the assumptions." A lender applies those rules to a membership base in four steps.

It separates the two revenue streams. Retail washes are transactional and weather-driven; memberships are recurring and priced monthly. A projection that reports a blended wash count and an average ticket has not told the underwriter what share of revenue is contractual.

It applies a churn assumption to the recurring stream and asks where it came from. Recurring revenue is treated as more durable than retail revenue, which is why the sector attracted securitized debt, but it is haircut for attrition, and a study that projects membership growth without a stated monthly churn rate and a source for it has not justified the growth.

It stress-tests price. Membership plans in the $25 to $50 a month range compete on a corridor, and the downside case is not fewer members but the same members at a lower plan. The case has to be carried through to coverage.

It tests the ramp against the two-year window. Industry estimates put a new express tunnel at 70 to 80 percent of stabilized volume within 12 to 18 months, which is consistent with the SOP's requirement that a construction project reach 1.15 coverage within two years of completion, but only if the membership sign-up curve in the projection is supported by the operator's own conversion data or by comparable openings.

For an acquisition, the membership base is also the asset being valued, which is why the independent business valuation and, from October, the quality of earnings report for larger deals matter more in this sector than in most: a wash that has been discounting plans to hold its member count shows the strain in its trailing twelve months, not in its forecast.

Where SBA money has gone, and where the risk sits

The 2025 distress was concentrated where SBA money was not. ZIPS was built by roll-up acquisition into corridors that competitors were entering at the same time, and its restructuring rejected leases, which is to say sites, rather than tunnels. Driven Brands exited a division it had assembled by acquisition. The lesson for an SBA credit memo is about site selection and corridor saturation, not about the wash business, and it is the reason the SOP's "market saturation by industry type and location" trigger is the right one to take seriously.

Loan Analytics' analysis of the SBA loan files, published on this site, shows car wash charge-offs at 5.25 percent against 7.45 percent for all industries, with openings down roughly 40 percent from the peak before the first bankruptcy. Where that lending went by state, and how it has performed, is the subject of the next table.

Two features of that record matter for 2026 underwriting. Average loan size has risen with tunnel cost, which pushes more projects into 504 structures and raises the equity injection at exactly the moment the special-purpose rule adds five points to it. And the charge-off advantage belongs to a population of loans that were mostly made before 2022, when a tunnel cost less and corridors had fewer of them; a study that leans on the sector's historical performance without checking the corridor's current tunnel count is quoting the wrong base rate.

What the study has to prove

For a car wash the eligibility section is short. The substance is in four places.

The corridor. Every existing and permitted express tunnel within the trade area, with its membership pricing, because saturation is the SBA's named trigger and the industry's named failure. Municipal moratoriums and water-discharge permitting belong here too; several jurisdictions have restricted new washes, and a site that cannot be permitted is not feasible at any price.

The ramp. Monthly wash volume and membership sign-ups from opening to stabilization, with the source for the curve, carried to the 1.15 coverage test within two years of construction completion, and the year-one liquidity where coverage is not reached in year one.

The split. Revenue by stream, retail and membership, with churn and price assumptions stated, and the downside case on price carried through to coverage.

The budget. Land, building, equipment with useful lives, soft costs, contingency and the tariff exposure on steel, with the 504 and 7(a) allocations shown, the special-purpose equity injection reconciled, and the appraisal and valuation requirements the SOP attaches to special purpose collateral.

Three questions that sort the deal

Is it a new tunnel or an existing wash? A ground-up tunnel is a 504 structure with the special-purpose equity, a bank first lien and a two-year ramp to 1.15 coverage from completion. An acquisition is usually a 7(a) loan with an industry-experienced appraisal, an independent valuation, and, for applications numbered on or after October 1, 2026, the 8.1 rules on historical coverage and quality of earnings.

Does the corridor have room? The SOP's saturation trigger and the sector's 2025 failures point at the same fact. The study has to count the tunnels.

Does the membership base hold at a lower price? If the projection survives a plan-price downside and a stated churn rate, the business is financeable. If it survives only on member growth, it is the projection the Inspector General's audits were written about.

The car wash was the poster child for overbuilding in 2025. It was also, on the federal loan tape, one of the safer things the SBA has financed. Both are true, and the difference between them is the site.

Frequently asked questions

Are car washes eligible for SBA loans?

Yes. A car wash is an operating business, and both 7(a) and 504 finance it. SOP 50 10 8 lists "car wash businesses" as Limited or Special Purpose Property, which raises the 504 borrower contribution to 15 percent, or 20 percent for a new business, and requires an industry-experienced appraiser.

Should I use 7(a) or 504 for a car wash?

504 finances the land, building, site work and long-life tunnel equipment through a bank first lien plus an SBA-backed debenture of up to $5 million, on 10, 20 or 25-year terms. 7(a) finances the whole project, including short-life equipment, technology, chemicals and working capital, up to a $5 million gross loan. Larger ground-up tunnels use 504; acquisitions and smaller projects usually use 7(a).

How much does an express tunnel cost to build in 2026?

Contractor estimates put tunnel equipment at $1.4 million to $2.1 million, a complete project at $2.6 million to $7 million, and a 120-foot express tunnel at $3.5 million to $8 million or more depending on region, before land of $500,000 to $2 million in most suburban markets. Steel tariffs of 50 percent have raised shell and canopy costs.

How does a lender treat unlimited membership revenue?

As recurring revenue, more durable than retail but haircut for churn. The SOP requires projections to carry supporting assumptions and a comparison to industry trends, so a credit memo will expect revenue split between retail and membership, a stated churn rate with its source, a price downside case, and a ramp that reaches 1.15 coverage within two years of construction completion.

What changes for buying an existing car wash after October 1, 2026?

SOP 50 10 8.1 applies to applications assigned an SBA loan number on or after October 1, 2026. Lender summaries describe a 1.25 debt service coverage floor for first-time acquisitions on historical earnings and a lender-ordered quality of earnings report where the business purchase price is $3 million or more.

Does the 2025 car wash distress affect SBA lending?

The bankruptcies and exits were private-equity roll-ups built on aggressive site acquisition. On the SBA loan tape, car washes have charged off at 5.25 percent against 7.45 percent for all industries. The relevant lesson is corridor saturation, which is also the SOP's named trigger for a feasibility study.

Sources:

1. ZIPS Car Wash, Chapter 11 restructuring, February 2025, as reported in Professional Carwashing & Detailing's 2025 year-end review (December 19, 2025) and CRE Daily citing CoStar (lease rejections and site sales).

2. Driven Brands Holdings, Form 8-K exhibits of February 25, 2025 and April 10, 2025 (sale of U.S. car wash business to Whistle Express), and Form 10-K for fiscal 2025 (discontinued operations, seller note sale).

3. Mister Car Wash, Inc., fourth quarter and full year 2025 results, February 18, 2026, and Form 10-K for fiscal 2025.

4. U.S. Small Business Administration, SOP 50 10 8, Lender and Development Company Loan Programs, effective June 1, 2025: Section B, Chapter 1 (Credit Standards, Collateral, Appraisals, Business Valuations); Section C, Chapter 1 (Limited or Special Purpose Property, Borrower's Contribution, Feasibility Studies).

5. U.S. Small Business Administration, 13 CFR 120.910 (borrower contributions), 120.931 (debenture limits), 120.933 (debenture maturities) and 120.160 (loan conditions), Electronic Code of Federal Regulations.

6. U.S. Small Business Administration, Information Notice 5000-880695, Issuance of SOP 50 10 8.1, August 14, 2026, effective October 1, 2026, and lender summaries of the change-of-ownership appendix published August 2026.

7. EB3 Construction, "How Much Does a Car Wash Tunnel Cost? A Project Budget Breakdown," April 2026.

8. Terrapin Construction Group, "Average Cost to Build a Car Wash in the USA (2026)," April 2026.

9. Delta Capital Group, "How Much Does It Cost to Open a Car Wash in 2026?", June 2026 (permitting and development timeline).

10. Loan Analytics, "The Car Wash Bubble That Wasn't," August 2026, and "The Express Car Wash Membership Monetization Benchmark," May 2026 (SBA loan-file charge-off and openings analysis).

11. U.S. Small Business Administration, Office of Inspector General, High Risk 7(a) Loan Review Program management advisories, 2017 through 2020 (recurring findings on repayment ability).