How to value a car wash from members to price

Why car washes sell on SDE, not car count

A car wash is an operating business, often on land the owner also owns. Buyers pay for the cash it can produce, and the lines that decide that cash, labor, chemicals, utilities, repairs, and rent, vary a lot between an express tunnel, a full-service wash, an in-bay automatic, and self-serve bays. That is why car count and revenue are cross-checks and the price is normally set as a multiple of SDE.

SDE is the total financial benefit to one owner who works in the business. It starts from profit and adds back the owner's pay, interest, depreciation, and personal or one-time costs. Larger washes and groups of washes are often priced on EBITDA instead, which treats a manager's pay as an expense. Know which measure a broker means before you compare multiples.

Example

Illustrative example. These are example inputs so the math is visible, not a real wash, a market average, or a benchmark. An express tunnel sells 30,000 retail washes a year at a $14 average ticket, $420,000. It has 1,500 unlimited members paying $30 a month. Each month 4% cancel, 60 members, and 60 new ones sign up, so the club holds at 1,500 and bills $540,000 over the next 12 months, 55.1% of revenue. Add $20,000 of add-ons and other income and revenue is $980,000.

Expenses are rent $150,000, chemicals $70,000, water, sewer, electric, and gas $80,000, paid staff $190,000, repairs $55,000, insurance $25,000, card fees, software, and marketing $45,000, and other costs $25,000, for $640,000 in all. Rent is 15.3% of revenue. At 3 washes per member per month the site washes 84,000 cars a year, about $11.67 of revenue per car.

The seller ran $5,000 of personal costs through the wash, so it is added back. SDE is $980,000 − $640,000 + $5,000 = $345,000, a 35.2% margin on revenue. If you hired a manager for $65,000 a year instead of running the site yourself, the cash flow would be $280,000.

Step 1: test the membership club

A big member count is only worth something if it holds. The number to watch is sign-ups needed to stay flat: members times the monthly cancel rate. In the example that is 1,500 × 4% = 60 a month, and the wash signs up exactly 60, so the club stays at 1,500.

Now change one input. If 5% cancel each month instead of 4% and sign-ups stay at 60, the club drifts down to about 1,362 members by month 12 and bills about $514,735 instead of $540,000. SDE falls to about $319,735, and at the same 3.5x to 4.5x range the midpoint after equipment drops by about $101,059. One extra percentage point of monthly cancellations moves the midpoint by about $101,059, which is why monthly member reports matter more than the total on the listing.

Step 2: apply a multiple range and subtract equipment due soon

At an example range of 3.5x to 4.5x SDE, the wash is worth $1,207,500 to $1,552,500, with a $1,380,000 midpoint at 4x. One full turn of SDE is $345,000 of price, so pick the range from recent sales of the same wash type, ideally from a broker who can show you the closed deals.

The multiple already assumes working equipment, so do not add equipment value on top. Price what will need replacing in the next few years. In the example that is $100,000, which brings the range to $1,107,500 to $1,452,500 and the midpoint to $1,280,000. The $1,350,000 asking price is 3.91x SDE, inside the range after equipment and above its midpoint, so ask what justifies the higher end: a growing club, newer equipment, or a long lease.

Step 3: value the land and building on their own

Many sellers own the land under the wash. Do not multiply SDE by the whole price. Charge the wash the market rent it would pay a landlord, so SDE reflects the business alone, then value the land and building on that rent and a cap rate the way you would any small commercial property. When you buy the land, add that market rent back to cash flow for the loan, because you are no longer paying a landlord.

For example, an in-bay automatic with self-serve bays earning $96,000 of SDE after a $36,000 market rent is worth $288,000 to $336,000 at 3x to 3.5x, or $238,000 to $286,000 after $50,000 of equipment due soon. At an 8% cap rate the land and building are worth $36,000 ÷ 8% = $450,000, so the business midpoint plus the real estate is $712,000. A $750,000 ask would leave $300,000 for the business, 3.13x SDE and above that range. These are example inputs, not market cap rates.

Step 4: test the loan and the largest price this cash flow covers

The SBA's 7(a) program is a common way to finance a small business purchase. The SBA says 7(a) terms are generally 10 years or less unless the loan finances real estate or equipment with a longer useful life, with up to 25 years for real estate. The lender sets the rate and down payment.

In the express tunnel example, 10% down leaves a $1,215,000 loan. At 10.5% over 10 years the payment is $16,394.60 a month, or $196,735.23 a year. With a $65,000 manager, the $280,000 of cash flow covers that 1.42 times, and $83,264.77 a year is left after the loan. On $260,000 of cash in, the down payment, $25,000 of closing costs, and the $100,000 of equipment, that is a 32.0% cash-on-cash return.

At a 1.25 minimum DSCR with the same down payment, rate, and term, $280,000 of cash flow would cover a loan on a price of about $1,537,091. That is an illustration of coverage, not a bid or a loan offer.

Common pitfalls

Counting members who already left. Ask for monthly billing reports, not a member total, and match them to the card processor's deposits. Look for months with many cancellations.

Trusting revenue you cannot prove. Match car counts to the wash software, the tax returns, and the water bill. Lenders underwrite documented cash flow, and buyers rarely pay for cash a seller says was never reported.

Counting equipment twice. Do not add equipment value to an SDE multiple. Subtract replacements due soon instead, and get the age of the conveyor, dryers, pumps, and controller.

Mixing up SDE and EBITDA multiples, or wash types. A multiple quoted on EBITDA, or on an express tunnel, applied to a self-serve wash's SDE overstates value. Ask how every multiple you see was measured.

Run your own numbers

The car wash valuation calculator loads with this exact express tunnel example. Pick the wash type, replace the inputs with the wash's own numbers, and it rebuilds the club, SDE, the value range, the asking multiple, the loan, DSCR, and the largest price this cash flow covers, then prints the whole thing. For a quick check of loan coverage alone, use the DSCR calculator.

These pages run the math on the numbers you type. They do not supply market data, and nothing here is an appraisal, a business valuation, a loan offer, or financial, tax, legal, or investment advice. Have a business broker, a CPA, a lender, and an attorney review any wash and its lease or land before you buy.

Sources

U.S. Small Business Administration, 7(a) loan program terms, conditions, and eligibility, https://www.sba.gov/partners/lenders/7a-loan-program/terms-conditions-eligibility (accessed November 11, 2026). Describes 7(a) maturities of 10 years or less unless financing real estate or equipment with a longer useful life, and up to 25 years for real estate.

Steps

1. Get the tax returns, the wash software reports, and the bills

   Ask for three years of business tax returns, two years of monthly car counts and membership reports from the wash software, the card processor's statements, twelve to twenty-four months of water, sewer, and electric bills, the lease or the deed, and a list of the equipment with its age.

2. Rebuild revenue: retail washes, the club, and add-ons

   Retail revenue is retail washes times the average ticket. Membership revenue is the members billed each month times the price, after cancellations and sign-ups. Add detailing, add-ons, and vending.

3. Calculate SDE

   SDE = revenue minus chemicals, utilities, paid staff, repairs, rent, insurance, card fees, marketing, and other costs, plus owner perks and one-time costs run through the business. Leave the owner's pay, loan interest, and depreciation out of expenses.

4. Apply a multiple range and subtract equipment due soon

   Multiply SDE by a low and a high multiple from recent sales of the same wash type. Subtract what it will cost to replace the conveyor, dryers, brushes, pumps, or pay stations in the next few years.

5. Value the land and building separately if they are included

   If the real estate is part of the sale, charge the wash a market rent, value the land and building on that rent and a cap rate, and add them to the business value. When you buy the land, add that market rent back to cash flow for the loan, because you are no longer paying a landlord.

6. Test the loan and find the largest price this cash flow covers

   Take off a manager's pay if you will hire one, compare the cash flow with the loan payment, and work out the largest price this cash flow covers at the lender's minimum DSCR.

Questions