The paint is the cheap part. Every commercial painting job that loses money loses it on prep and access, not on the gallons.
So if you’re figuring out how to quote commercial painting jobs, the number you have to get right isn’t coverage or coats. It’s the prep hours and how you’re going to reach the work. Get those wrong and no markup on materials saves you.
Measure the real surface, not the floor
Start with square footage of the actual paintable surface. Walls, ceilings, trim, doors, whatever’s in scope. Measure it, don’t guess it off the lease plan.
Wall area is perimeter times ceiling height, minus the big openings like storefront glass and roll-up doors. Ceilings are the floor footprint. Trim, doors, and frames get counted separately because they paint at a completely different rate than open wall.
Break it out by surface type. A thousand square feet of smooth drywall and a thousand square feet of concrete block are not the same job. Block drinks paint and slows the roller. Get the counts by surface so your labor and material math actually lines up with what the crew will hit.
Prep is the variable that decides the job
Two identical buildings can have prep hours that differ by half. That’s the whole ballgame.
New drywall that just needs a light sand and a prime coat is fast. Repaint over a wall that’s been patched, has old failing coatings, grease in the breakroom, water stains, or forty nail holes from the last tenant is slow. Now add masking, covering floors and fixtures, moving or draping furniture in an occupied space, and taping off everything you’re not painting.
Walk the site and grade the prep honestly. Is it clean and empty, or is it a lived-in space full of stuff you have to work around. Is there existing coating failure you’ll have to scrape and spot-prime, or worse, an unknown coating that needs a bonding primer. Old surfaces, high-touch surfaces, and anything with existing damage all add hours.
Price prep as its own labor line so you can see it. When you bury prep inside a per-square-foot number, you stop noticing that this job needs twice the prep of the last one, and that’s exactly how you underbid.
Coats and coverage set your materials
Coverage is roughly 350 to 400 square feet per gallon per coat on smooth surface, less on rough or porous block, less on the first coat over bare or patched wall.
Count the coats honestly. A color change, especially going light over dark or covering a red or deep accent wall, is two coats minimum and sometimes a tinted primer plus two. Repainting the same color on a sound surface might be one. Bare drywall is prime plus two. Don’t quote one coat and hope.
Materials are paint, primer, and the consumables people forget: tape, plastic, masking paper, rollers, brushes, tips, caulk, patching compound. Consumables are real money on a big job. Price the good paint the spec calls for, not the cheap stuff, and mark materials up like any other job cost.
Even after all that, materials are usually the smaller half of a commercial paint bid. Labor is the bigger half, and prep is the swing inside labor.
Access is a line item, not an afterthought
How the crew reaches the work changes the price more than most estimators admit.
Ten-foot walls you roll from the floor are one thing. Twenty-five-foot ceilings in a warehouse or atrium mean scissor lifts or boom lifts, which means rental cost, delivery, and a slower, more careful pace up in the air. Stairwells, high exterior work, anything over a roofline, all of it adds equipment and time.
Then there’s when you’re allowed to work. Occupied offices, retail floors, restaurants, and schools often mean nights, weekends, or working around people during the day. After-hours work carries a labor premium and it’s slower because you’re setting up and tearing down protection every shift. If the client wants zero disruption to their operation, that’s a real cost, so build it in and say so in the quote.
Write the scope so change orders pay you
Commercial paint scope creep is constant. “Can you also do the trim.” “The back hallway too, right.” “We decided we want the ceilings after all.”
Spell out exactly what’s included: which surfaces, how many coats, what color scheme, what prep level you priced for. Then spell out what triggers a change order. Hidden damage you find behind furniture, additional surfaces, a color change after you’ve started, a coating that needs more prep than the walkthrough showed. Put a number and a signature on the change before the brush moves, not after.
Managing that on a commercial account with multiple buildings is where it gets away from you. We built facility maintenance software so a change order is a logged, approved line instead of a text you half-remember, and the same quoting and work order tools keep the original scope attached to the job so there’s no argument about what you agreed to paint.
Quote the prep, price the access, hold the scope, and the paint takes care of itself. If you’re bidding commercial repaints and watching prep quietly eat the margin, see how TradelyHQ keeps the scope and the change orders straight.