How to Invoice After Commercial Lot Pressure Washing
Short answer: How to invoice after commercial lot pressure washing means billing a facilities department, not a homeowner. Price flatwork per 1,000 ft² from your own surface cleaner production rate, then add per-unit lines — dumpster pads each, curb and walk by linear foot, gum by the spot, oil by the stain. Bill water haul, wash water recovery, night premium and lot closure separately. Carry the PO, site number and work order on the document, and submit inside their AP cutoff.
The person who watched you work is not the person who pays you. On a lot job the store manager or the on-site super signs a work ticket, and then the invoice travels to a management company two states away where a clerk who has never seen the property decides whether the document is complete enough to process. Everything about how you write it should be aimed at that clerk. The general B2B mechanics are in how to invoice a company; below is what a 60,000 square foot parking lot adds.
What does a commercial lot invoice carry that a driveway invoice never does?
Six blocks a residential invoice has no use for.
| Block | What it reads on a lot job |
|---|---|
| Bill-to and site | Management company as bill-to, physical site address and store number as the service location |
| Reference numbers | PO number, work order number, service agreement number, vendor ID |
| Zones | Each area billed separately, with its measured quantity and unit |
| Spot work | Gum count, oil stain count, grease trap surround, drive-thru lane |
| Environmental | Wash water containment and recovery method, disposal destination |
| Access window | Date, start and end time, lot closure sections, night premium |
| Exceptions | Zones deferred because vehicles were parked, and why |
| Photo index | Zone-by-zone before and after, timestamped, with the lighting used |
| Terms | Net terms as agreed, remit instructions, tax treatment |
The exceptions block is the one that decides whether you get paid in full. On any live lot there will be cars parked where you needed to wash, and the clerk processing the invoice is comparing your total against a scope document. If four rows of stalls did not get done, say so on the invoice with the reason and the proposed return date. Silence there reads as an overbill and holds the whole document.
Where does the square footage on a lot come from?
Measured, per zone, before the quote — and repeated on the invoice so both documents match.
A lot is not one number. It is drive lanes, parking stalls, entry sidewalks, curbing, dumpster pads and specialty areas, and each has a different production rate and a different unit.
| Zone | Unit | Why it is separate |
|---|---|---|
| Drive lanes and stalls | ft², billed per 1,000 | Open flatwork, surface cleaner runs fast |
| Entry sidewalks and awning drip line | ft² | Heavier soil, slower, often hand detail at edges |
| Curbing and wheel stops | Linear feet | Hand wand only, no surface cleaner |
| Dumpster pad and surround | Each | Grease loading, degreaser, contained runoff |
| Drive-thru lane | Linear feet or ft² | Grease and drink spill density is a different job |
| Gas island or fuel canopy | Each, plus canopy ft² | Petroleum residue, overhead work |
| Gum | Spot count, or per hundred | Heat and dwell, purely a time item |
| Oil and hydraulic stains | Spot count or ft² | Degreaser, dwell, agitation, uncertain outcome |
Take the flatwork number from an aerial measurement and verify the perimeter on the walkthrough. Take the linear-foot and per-unit counts by walking it with a counter, because no satellite image tells you there are 412 pieces of gum across the entrance frontage.
How do I turn a lot into billable production hours instead of a guess?
Time yourself once on a measured area and you never guess again.
On flatwork, cleaning speed is driven by water volume far more than by pressure. A surface cleaner is doing work at a rate set by your gallons per minute, the cleaner’s width, and how filthy the concrete is — and the only honest source for your rate is your own machine on your own lot. Mark out a known section, run it, note the clock. Now you have square feet per hour for that surface at that soil level, and every future lot divides straight into hours.
That number is what stops the classic commercial mistake, which is scaling a residential driveway price up to lot size. A driveway price includes a big fixed component of setup and travel spread over 800 square feet. Multiply it by 75 and you have produced a fantasy number that no crew can hit.
Build the price the other way around:
- Measured area ÷ your production rate = wash hours per zone.
- Add mobilization, setup and teardown as fixed hours, not as a percentage.
- Add refill trips if the site cannot supply water at your flow.
- Multiply total hours by your loaded crew-hour cost — wages plus burden, equipment cost per hour, fuel and truck.
- Add chemistry at actual consumption, degreaser separately from general surfactant.
- Add disposal or reclaim cost.
- Add overhead, then margin.
If a per-1,000 ft² figure from a forum lands well under what your own build produces, the useful question is whether your production rate is low or whether the forum poster is quoting a clean, empty, daylight lot with a hydrant on it. Regional labor, soil condition, night work and access change these numbers enormously, and the only price that protects you is the one built from your own cost.
Which lines cover water supply and wash water recovery?
Two of the biggest cost drivers on a lot, and both are invisible on a residential invoice.
Water. Flow is the whole job, and flow consumes. A machine running four gallons a minute for six productive hours has moved roughly 1,440 gallons. A buffer tank on a trailer does not hold a day’s worth of that, so either the site provides a usable supply or you are hauling — and refill trips are lost production hours that belong on the invoice as their own line. Some cities will issue a hydrant meter permit for exactly this; that permit fee is a pass-through line.
Wash water. This is where commercial diverges from residential completely. Under the Clean Water Act, discharging wash water into a municipal storm sewer generally requires an NPDES permit, and the permits that exist are written for facilities rather than for a contractor washing somebody’s parking lot — the EPA’s NPDES stormwater program is the framework. The practical compliance path is to not discharge at all: berm or dam the drains, vacuum the process water into a tank, and either haul it or release it to sanitary sewer where the local utility allows it, sometimes with pretreatment conditions. Many municipalities also run their own mobile washer registration program.
Write that method on the invoice: drains protected, water recovered, gallons collected, disposal destination. It is the line that distinguishes your bid from the cheaper one, and it is also the line that protects the property owner, which is why property managers pay for it without much argument once they understand it.
What does night work add to the invoice?
Everything that comes with an empty lot, and it needs to be priced as its own set of items rather than folded into the rate.
- Shift premium. Crew pay is different at 2 a.m., and so is the rate at which people work.
- Lighting. Tower or trailer lighting is equipment cost, and without it the after photos are useless.
- Traffic control. Cones, barricades, signage, and a person managing the one car that always drives through.
- Sectioning. Working a live lot in quadrants means additional setups and teardowns, not one.
- Coordination. Getting the lot cleared, keys, gate codes, and someone reachable at midnight.
Put the access window on the invoice — date, start time, end time, and which sections were closed when. On recurring accounts this becomes the record that shows you honored the agreed window, which matters the first time a tenant complains about noise.
Who am I actually billing, and what does their AP department need?
Whoever the PO says, and the answer is almost never the person on site.
| Document | Why it holds payment if missing |
|---|---|
| PO number on the invoice | Most AP systems cannot match an invoice without it |
| Site or store number | Multi-site owners route costs by property |
| Work order number | Ties your invoice to their maintenance ticket |
| W-9 on file | No payment is issued to an unregistered vendor |
| Certificate of insurance | Usually with the management company named as additional insured |
| Signed work ticket | On-site acknowledgement that the work happened |
| Correct remit-to | A remit address that differs from your letterhead stalls things |
Get the PO before the trailer leaves the yard, not after. Work performed without a PO on a commercial account is the most common reason a lot invoice sits unpaid for ninety days, and it is entirely preventable with one text message.
Terms are set by them, not by you, and they will be net 30, 45 or 60. Argue about the number before the work, in the agreement, not on the invoice. Then submit fast: their payables cycle has a cutoff date, and an invoice that lands on the wrong side of it does not wait a day, it waits a full cycle. Twenty-four hours from completion is the target. When one does age past terms, the escalation path in how to get clients to pay works, but on a commercial account the first step is nearly always confirming the invoice was actually received in the portal.
What changed between the walkthrough and the invoice?
Lots have a distinctive list, and each item should have been approved before you did it.
- Parked vehicles. Zones you could not reach. Either deferred with a return date or credited.
- Gum count off. The walkthrough count was from the entrance; the actual count came from walking the whole frontage.
- A grease field nobody mentioned. Dumpster surrounds and drive-thru lanes hide the worst of it, and degreaser plus dwell plus agitation is a different rate than open flatwork.
- Striping condition. Faded paint lifts under any real cleaning. Photograph and disclose before you start, and never repair it silently.
- Water not available. A spigot that turned out to be locked, dead, or a quarter of the flow you needed.
- Drain layout. More storm inlets than the plan showed means more containment setups.
- Surface you did not price. Asphalt is not concrete and does not take the same approach; if a section turned out to be asphalt, that is a scope change.
Every one of those becomes a change order with a photo and a number, sent to whoever holds the PO, before the work happens. On commercial accounts an unapproved extra is not a negotiation — it is a line the AP system will simply refuse.
How do photos work when the job was done at 2 a.m.?
Fixed positions, consistent lighting, one set per zone, and shot in a way a person who has never been to the property can follow.
Night photography is genuinely harder and it is not optional, because the reviewer is looking at your images in an office next week. Use the light tower for both the before and the after, from the same spot, or take the before at dusk during setup rather than in full dark. Include something identifiable in frame — a light pole number, a stall number, the dumpster enclosure — so a zone can be matched to the invoice line without guessing.
Then index them. “Zone 3 — north drive lane — before” and “Zone 3 — north drive lane — after” beats forty untitled images every time. Some portals want them uploaded with the invoice; some want a PDF. Either way the naming does the work.
When does the money actually arrive, and what makes it faster?
On their cycle, and the only levers you control are completeness and speed.
Same-day collection does not exist on a lot job. What replaces it is a document so complete that nobody has a reason to email you a question — because every question adds a full cycle, not a day. In practice that means: PO on the invoice, zones matching the scope document exactly, exceptions disclosed, photos indexed, signed ticket attached, submitted through whichever channel they specified rather than the one that is convenient for you.
Recurring service agreements — quarterly lot washes, monthly dumpster pads — invoice per service with the agreement number on each one, not as a lump at the end of the term. It keeps each service tied to a verifiable date and photo set, and it keeps your cash arriving on a rhythm instead of in one annual lump. The receipt side of the transaction matters too, since some property managers need a payment record separate from the bill; what is a receipt covers the distinction.
What do I keep after the lot invoice goes out?
The invoice, the photo index, the signed ticket, the disposal record, and the fuel and chemical receipts from that night. Commercial accounts are also the ones most likely to ask you for a copy eighteen months later, so how long the file lives matters — see how long to keep tax records.
Keel is an iOS app that holds that whole side on the phone. Everything stays on the device — no account, no bank connection, no cloud, no login — and the App Store privacy label reads Data Not Collected. Build the invoice in the truck with your own numbering series, logo and brand color, add the payment link as a QR code, and send the PDF while the crew is loading cones. The degreaser invoice and the disposal ticket get photographed and read on device with Apple Intelligence, the drive to a site an hour out goes into the mileage log, and Freeboard shows cash minus tax reserve minus committed invoices — which on net-45 commercial work is the difference between a good month and a month that only looks good. Reports, an Accountant Pack of CSV plus a one-page summary PDF, and a one-file year export all sit on an append-only hash-chained ledger. Free is $0 with unlimited invoices, receipts and mileage; Keel Pro is a one-time $249.99 Lifetime purchase, not a subscription.
Frequently asked questions
Should a commercial lot be billed per square foot or as a flat price?
Quote a flat price per zone, but build it from measured square footage and your own production rate, and show the quantities on the invoice. A management company reviewing a lump sum has nothing to check it against; the same total broken into drive lanes by the thousand square feet, curbing by linear foot, and gum by the spot answers its own questions and matches the scope document.
Do I need a PO number before washing a commercial lot?
On nearly every managed property, yes, and getting it after the fact is far harder than getting it before. Accounts payable systems match invoices to purchase orders, and work with no PO can sit indefinitely while somebody decides who authorized it. Ask for the PO in writing when the schedule is confirmed, and put it on the invoice, the work ticket and the photo index.
Where is the wash water supposed to go?
Not into a storm drain. Under the Clean Water Act, discharging wash water to a municipal storm sewer generally requires a permit, and the practical compliance route is not discharging: block the inlets, recover the water by vacuum, and haul it or release it to sanitary sewer where the local utility permits that. Write the method and destination on the invoice.
How do I bill for parking stalls I could not reach because cars were there?
Disclose them on the invoice as deferred zones, with the reason and a proposed return date, and bill only what you cleaned. Do not quietly bill the full scope and hope nobody counts. The reviewer is comparing your total against a scope document, and an unexplained gap is the fastest way to have the entire invoice put on hold rather than one line questioned.
Can I charge extra for night work on a parking lot?
Yes, and it should be itemized rather than buried in the rate. Shift premium, tower lighting, cones and traffic control, and the extra setups that come from working a live lot in sections are all real costs of the access window the property required. Put the window on the invoice with start and end times and which sections were closed.
How fast should a commercial pressure washing invoice go out?
Within about a day of finishing. Accounts payable runs on cycles with a cutoff, so an invoice that misses the cutoff does not wait a day — it waits until the next run. Speed only helps if the document is complete, though: PO number, site number, matching zone quantities, disclosed exceptions and indexed photos, submitted through the channel the client specified.
This article is general information, not professional or tax advice.
How do I actually get paid?
The part that gets you paid
An invoice in under a minute, on your iPhone.
Pick a client, add a line, send a clean PDF — or say it in words and confirm the draft. Your own pay-me link goes on as a QR code. Free to start; unlimited invoices and your own branding are Pro.
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