What does it cost to buy an express car wash?
The short answer: about $1.84 million for the business below, with roughly $313,000 cash to close. The longer answer is the lender's math — and it's worth running before you agree on a price.
The short answer
This is a modeled single express tunnel, built from researched benchmarks — not a listing, and not a promise about any specific wash. The numbers come from the free Parallel Space acquisition calculator's car-wash preset.
| Figure | Amount |
|---|---|
| Year-1 revenue | $1,166,400 |
| EBITDA (35% margin) | $408,240 |
| Seller's discretionary earnings (SDE) | $408,240 |
| Purchase price (4.5× SDE) | $1,840,000 |
| Cash to close (15% equity + 2% closing costs) | ≈ $313,000 |
| Acquisition loan (85% of price) | $1,564,000 |
| Annual debt service (10%, 10 years) | ≈ $248,000 |
| Seller DSCR | ≈ 1.65× |
For context: a mature express car wash runs $1.5–3.0M in revenue with 35–50% four-wall EBITDA (MMCG, 2026). The modeled business above is a smaller single tunnel at $1.17M revenue — the same 35% margin, at the lower end of the revenue range.
How the price is set
The price is 4.5× SDE — a researched multiple for a mature express tunnel. SDE, seller's discretionary earnings, is the cash the business throws off for its owner: EBITDA plus the owner's compensation and add-backs. At the calculator's defaults the owner's labor is already inside EBITDA, so SDE equals EBITDA here: $408,240 × 4.5 ≈ $1,840,000.
Why not a revenue multiple? Because revenue ignores margin. Two washes with the same $1.17M in sales can earn very different amounts — one at 35% margin, another at a much thinner margin — and buyers pay for earnings, not sales. The multiple follows the cash, not the top line.
The lender's math
Most buyers borrow most of the price. At 85% financing, the loan is $1,564,000. The rate is 10% — prime at 7.00% plus the 3.0% maximum spread for SBA 7(a) loans over $350K — over 10 years, which works out to about $248,000 a year in debt service.
Divide the earnings by the debt service and you get the debt-service coverage ratio: $408,240 ÷ $248,000 ≈ 1.65×. The SBA benchmark is 1.25×, so this deal clears it on the modeled numbers, with room to spare.
Read this carefully: under SBA SOP 50 10 8.1 (effective October 1, 2026), the 1.25× DSCR test runs on historical earnings — trailing tax returns, not your projection. The 1.65× above is a forward-looking model. It is a benchmark for judging the deal, not a pass/fail verdict from a lender. The lender will test the business's actual past earnings.
Cash to close is the other number that surprises buyers. At 15% equity ($276,000) plus 2% closing costs ($36,800), you need about $313,000 out of pocket — before working capital. SBA 7(a) requires at least 10% equity on a first-time acquisition, so 15% is a typical buyer contribution, not the floor.
What can go wrong
Add-backs that don't survive
Sellers often add back owner perks and one-time expenses to get to SDE. Lenders discount the ones they don't believe. Every dollar of add-back that falls out cuts SDE by a dollar — and at 4.5×, it cuts the price the math supports by $4.50.
The owner's own labor
If the owner works the tunnel, replacing them costs real money. The model above assumes the owner's labor is already inside EBITDA. Before you trust the $408,240, ask what a hired manager or operator would cost — and whether the earnings hold up after paying them.
Seasonality
Car-wash volume swings by month. Annual averages hide the trough, and the trough is what tests your cash. Look at the monthly shape, not just the yearly total, and make sure the slow months still cover the loan payment.
Frequently asked questions
How much cash do I need to buy an express car wash?
On a $1.84M price, about $313,000 at 15% equity plus 2% closing costs — before working capital. The SBA minimum is 10% equity, so the floor is lower, but 15% is what a typical buyer puts in.
What DSCR does an SBA lender require?
1.25×, tested on historical earnings under SOP 50 10 8.1. A modeled DSCR above 1.25× is encouraging, but it is not the test — the lender looks at trailing earnings, not your forecast.
Why 4.5× SDE instead of a revenue multiple?
Because buyers pay for earnings. A revenue multiple treats a 35%-margin wash and a thin-margin wash as the same business. The SDE multiple prices the cash the business actually produces.
Is the calculator really free?
Yes. The acquisition calculator is free to use, with 19 industry presets and the same lender math shown on this page. There is a $49 full 10-year Excel model for the car wash if you want the complete workbook.
Run your own car-wash deal — free
Change the price, the loan terms, the add-backs, the season shape — and see what the lender's math says about your deal.
Open the free car-wash calculatorWant the full 10-year workbook? The car-wash acquisition model is $49 on Gumroad.
Want a custom model built for your deal? David offers custom model builds, valuations, and FP&A advisory on Contra.