How to Estimate Pressure Washing Jobs: Measure, Test, Quote

Short answer: To estimate pressure washing jobs, decide the method before the price. Concrete takes high pressure with a surface cleaner; vinyl siding and asphalt shingle roofs take a soft wash, and pressure on either causes damage you pay for. Measure the surface in square feet, time the spigot with a five-gallon bucket to confirm you have the flow, then convert square feet to hours using production rates you timed yourself. Setup and travel run about 1.3 hours regardless of job size, which is why a minimum charge is not optional.

Almost every unprofitable pressure washing job was priced correctly per square foot and wrong overall, because square footage is the smallest input in the estimate. Method, water, access, and the fixed block of setup and travel decide whether the day pays. The walkthrough below takes fifteen minutes on a house and thirty on a commercial lot.

What do I measure, and in what units?

Different surfaces sell in different units, and blending them into one square-foot number is how deck rails and roofs get given away.

Surface	Unit	How to get it
Driveway, walks, patio	ft²	Wheel or pace length × width; count the apron and the walk separately, they clean at different rates
House siding	ft² of wall, or a price per elevation	Perimeter × average wall height, plus gables as half base × height
Roof	Squares of roof area, 100 ft² each	Footprint × pitch factor from the ground; never by walking it to measure
Deck	ft² of deck floor plus linear feet of rail	Rails price per linear foot and take far longer per square foot than the floor
Fence	Linear feet × height, per side	Two sides is two prices, and the neighbor’s side may not be yours to touch
Commercial lot	ft² by zone	Drive lanes, stalls, entry, and the dumpster pad, which is its own price and its own chemistry

Write the elevations down separately on a house. A rear elevation blocked by a deck, an AC unit, and a hedge is not the same production rate as the open gable on the side.

How do I decide between high pressure and a soft wash?

Before the number, because the method changes the hours, the chemical cost, and your liability. Getting it wrong on the wrong surface is a claim, not a callback.

Surface	Method	What goes wrong with the other one
Concrete, brick, pavers	High pressure with a surface cleaner	Too little pressure leaves lap marks; the wand alone leaves stripes you will be back to fix
Vinyl, aluminum, painted wood, stucco	Soft wash — low pressure, cleaning solution, dwell time, rinse	Pressure drives water behind the siding, etches paint, and forces water past window seals
Asphalt shingle roof	Soft wash only	Pressure strips granules; ARMA’s guidance for algae and moss is a bleach and water solution applied with a sprayer, allowed to dwell, then rinsed at low pressure, and it says never to pressure wash a shingle roof
Cedar, redwood, older wood decks	Low pressure plus the right chemistry and a brightener	Feathering and furring the grain is permanent, and no amount of sanding puts it back
Stamped or sealed decorative concrete	Low pressure, or decline	Pressure strips the sealer, and a reseal is a job you did not quote

Say the method out loud on the estimate. “Siding is cleaned by soft wash at low pressure with a cleaning solution and will not be pressure washed” is the sentence that explains why your bid is higher than the one from the guy with a 4,000 psi wand, and it wins work rather than losing it.

What do I test on site before I quote?

Four tests, none of which takes more than three minutes.

• Flow at the spigot. Fill a five-gallon bucket and time it. Five gallons in sixty seconds is 5 gpm. If the supply cannot keep up with your machine, you need a buffer tank on the trailer and possibly a fill trip, which is a real line.
• The chalk test on siding. Wipe a gloved hand down a painted or vinyl surface. Chalk on the glove means oxidation, and oxidation does not clean off — it becomes more visible once the dirt is gone. Disclose it in writing before, not after.
• Stain identification. Organic growth responds to chemistry and dwell time. Oil in concrete needs a degreaser and may never fully leave. Rust needs its own product and its own line. Tannin bleed, artillery fungus on siding, and battery acid each behave differently, and artillery fungus in particular does not come off.
• Runoff path. Follow the water. Where it goes decides whether you need containment. Wash water reaching a storm drain enters the EPA’s NPDES stormwater program territory, and many municipalities restrict it outright — particularly on commercial lots and anything carrying oil, paint, or solvent residue. Find out before you bid, because vacuum recovery is a different rig and a different price.

Also check the exterior outlets, meter, and light fixtures for water intrusion paths, and look at every window for a failed seal you will otherwise be blamed for.

What do I photograph?

Every elevation before you touch anything, with something in frame for scale. Then the defects, individually and close: cracked or brittle siding, failed caulk, rotted trim, oxidized panels, loose gutter sections, rusted flashing, gaps at the J-channel. The oil stains with a tape across them. The runoff path. The spigot and the hose route. On a roof job, all four sides from the ground plus any lifted or missing shingles. These photos are both the record when a homeowner says the crack was not there before, and the reference you price from that evening instead of guessing at the memory of the back yard.

What do I have to ask before I leave the driveway?

• When was it last cleaned, by whom, and with what method?
• Are there any window leaks or interior water problems already?
• Do you want the gutter faces brightened? That is a separate product, separate labor, and a separate line — it is not part of a house wash.
• Any plants you care about, and is anything newly planted?
• Pets, kids, cars to move, gate codes, and are you home that day?
• Any exterior outlets or fixtures you already know are bad?
• Is this for a sale, a rental turnover, or an HOA letter? A deadline is worth pricing.
• On commercial: after-hours only? Is there a wash-water rule for this property? Who signs the completion, and what is the payment process?

The gutter question is the one operators forget most. A customer who expected clean gutter faces and got a clean roofline is unhappy for a reason you could have priced.

How do I turn square feet into a price?

With production rates you measured, not rates from a forum. Time three jobs per surface type with your own machine, your own hose length, and your own crew, then keep the numbers on the phone.

Surface and setup	One operator’s timed production
Concrete drive, 20 in surface cleaner at 4 gpm	1,150 ft² per hour
Concrete with heavy oil, pre-treat and agitate	380 ft² per hour
Vinyl siding, soft wash, single story	1,450 ft² per hour
Vinyl siding, soft wash, second story from the ground	850 ft² per hour
Wood deck floor, low pressure plus brightener	300 ft² per hour
Deck rail	22 linear feet per hour

Worked example, a driveway plus a house wash:

Step	Calculation	Amount
Driveway and walk	980 ft² + 180 ft² = 1,160 ft² ÷ 1,150	1.01 hr
Siding, single story with two gables	1,720 ft² ÷ 1,450	1.19 hr
Setup, hose run, plant pre-wet, teardown	Fixed	0.75 hr
Travel, round trip	Fixed	0.55 hr
Total on the clock		3.50 hr
Operator, van, machine and overhead	3.50 × $78.00	$273.00
Chemical	14 gal of mix at your costed price per gallon, plus driveway pre-treat	$23.40
Cost		$296.40
Price at 40% margin	$296.40 ÷ 0.60	$494.00
Quoted	Rounded	$495.00

Cost your chemical per gallon of finished mix — jug price divided by jug volume, times the gallons you actually use — rather than per job. Then check the result as revenue per hour: $495 ÷ 3.5 = $141.43. Because material is a small share of a wash ticket, revenue per hour is the number that has to hold across every job you take, and it is a far better guide than a per-square-foot rate.

The $78.00 hour and the 40 percent margin above are one operator’s figures, not a benchmark. Loaded hourly cost moves with insurance class, whether you run a solo rig or a two-person crew, and how much of the season the trailer sits; achievable margin moves with local competition, water-discharge rules, and how much roof and commercial work you take. Published per-square-foot rates vary by a factor of two or more between markets, so treat them as a sanity check on the order of magnitude and rebuild your own numbers from your own timed jobs.

Why does every job need a minimum charge?

Because the fixed block does not shrink. Setup, hose run, plant protection, teardown, and travel came to 1.3 hours on the job above and would be nearly identical on a 220 ft² patio — which is about twelve minutes of actual cleaning.

Sell that patio at your driveway square-foot rate and you have committed a 1.5-hour block for roughly the price of lunch. Set the minimum at the price of your smallest profitable block: fixed time plus a half hour, multiplied by your target revenue per hour. Say it on the phone before you drive, in one sentence, and stop quoting small jobs by the square foot entirely.

What does the estimate miss most often?

Water source, when there is no working spigot and the tank has to be filled. Second-story reach, where ladders, extension wands, or a lift change both hours and insurance. Oxidation on siding and painted surfaces, which becomes more visible after cleaning and must be disclosed rather than absorbed. Rinsing down and post-treating landscaping, plus replacing the plants you kill anyway. Screens, which are a service to remove, clean, and re-hang, not a favor. Rust and battery acid, which need separate chemistry and a separate line. Gutter face oxidation. Hot water, which costs more per hour to run than cold — if you priced cold and used hot, you gave away the difference. And on commercial work, the after-hours premium, the cones and barricades, and the signature you need at four in the morning.

Mileage is the quiet one. Travel between jobs on a route day adds up faster than in most trades, and those miles are deductible if the log holds up, which is what how to track mileage for taxes covers.

How do I write it so a damage claim doesn’t land on me?

Four blocks, all short.

A pre-existing conditions section that names what you found and references the photos by elevation. A method statement per surface, saying explicitly which surfaces get low pressure and which get high, and why. Disclaimers for the three things that genuinely do not clean off: oxidation, artillery fungus, and stains that have etched into concrete. And a customer-preparation list — close windows, move cars, retract awnings, turn off attic fans, secure pets — with a line saying the work proceeds on the assumption it was done.

Name your insurance on the page. On a roof or a soft-wash job, the fact that you carry it and the low-bidder does not is the actual difference between the two quotes, and it belongs in writing. The pressure washing estimate template puts these blocks in order.

What do I keep after the job?

Actual hours per surface against your estimated hours, chemical used, and the before-and-after photo set. Three jobs of honest timing beats any published production table, and it is what turns your rates from borrowed to owned.

Keel is an iOS app that keeps all of it on the phone: no account, no bank connection, no cloud, no login, and an App Store privacy label reading Data Not Collected. It does not write the estimate — that stays wherever you build it today. What it does is everything after the yes. The invoice goes out from the driveway before the hose is rolled, with your own numbering, your logo, your brand color, and a payment link the customer scans as a QR code off your screen, which for residential wash work means getting paid the same day rather than chasing a check — the same structure as the pressure washing invoice template. Chemical, fuel, and equipment receipts get photographed and read on device by Apple Intelligence, so a season of surfactant and sodium hypochlorite purchases is actually there at tax time, alongside the categories in self-employed tax deductions. Every route leg is a logged mile, and the year exports as a single file. Free covers unlimited invoices, receipts, and mileage; Keel Pro is a one-time $249.99 Lifetime purchase, not a subscription. You can get it on the App Store.

Frequently asked questions

How do I measure a house for a pressure washing quote? Take the perimeter and multiply by average wall height for the wall area, then add gables as half the base times the height. Record each elevation separately, because a rear wall blocked by a deck, a condenser, and shrubs cleans far slower than an open side wall. Note the story count, since second-story reach changes both hours and equipment.

Should I charge by square foot or by the hour for pressure washing? Quote the customer a flat price, but build it from hours. Convert measured square footage into hours using production rates you timed with your own machine, add the fixed setup and travel block, then apply your target revenue per hour. Pure square-foot pricing underprices small jobs badly, because the fixed block does not scale down.

What is a minimum charge for pressure washing and why do I need one? It is the price of your smallest profitable block of time. Setup, hose run, plant protection, teardown, and travel take roughly the same time whether the job is 200 or 2,000 square feet. Without a minimum, a small patio consumes a 1.5-hour slot for a fraction of what that slot is worth. Publish it on the phone.

When should I soft wash instead of pressure wash? On vinyl and aluminum siding, painted wood, stucco, cedar, and any asphalt shingle roof. Soft washing uses low pressure, a cleaning solution, and dwell time rather than force. ARMA’s guidance on asphalt shingles is explicit that a pressure washer causes granule loss and can shorten roof life, and the same force drives water behind siding and past window seals.

How do I price a roof cleaning estimate? By roof area in squares, measured from the ground using footprint and pitch factor rather than by walking it. Price the chemical volume, the dwell and rinse time, the plant protection and rinse-down, and the access risk separately. State clearly that the roof is soft washed and not pressure washed, and photograph any lifted, cracked, or missing shingles before you start.

What should a pressure washing estimate include to protect me? Pre-existing conditions with photo references, a method statement naming which surfaces get low pressure, disclaimers covering oxidation, artillery fungus, and etched stains, a customer preparation list, your minimum charge, your insurance, and what you will not clean. Add the water source and power arrangements, because a missing spigot changes the equipment and the price.

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This article is general information, not professional or tax advice.