How to Estimate a Painting Job

Ask ten painters how they price a job and you'll get answers ranging from a confident per-square-foot number to "I look at it and I know." Both work until they don't. The per-square-foot rate quietly loses money on the house with sixteen-foot ceilings and forty years of failing caulk, and the gut number stops being reliable the moment you hire a second crew who doesn't share your gut.

What follows is the long way. It takes longer than guessing, and it's the reason some painting companies survive a bad quarter.

Measure paintable area, not floor area

Floor square footage is a real estate number. It tells you almost nothing about how much paint you're moving. What you want is wall and ceiling area, which means length times height for each wall, added up, minus the openings.

Whether you subtract openings is a judgment call worth being consistent about. Most painters deduct only the large ones, a picture window or a sliding door, and leave standard doors and windows in the total. The logic is that cutting in around a window takes more time per square foot than rolling the wall it sits in, so the area you "lose" gets paid back in trim labor you didn't itemize separately.

Ceilings get measured separately from walls, because they price differently. Rolling overhead is slower than rolling a wall, and if the ceiling is textured you're looking at meaningfully higher paint consumption for the same area.

For exteriors, add the elevations the same way, then look hard at the substrate. Smooth siding, rough cedar, stucco, and brick absorb wildly different amounts of paint over the same measured area. Rough stucco can drink close to twice what smooth siding does.

Decide the number of coats before you price anything

Coat count changes the estimate more than almost any other single decision, and it's the one most often left vague until the crew is already on site. Two finish coats over a primed, previously painted wall in a similar color is the baseline. Going dark over light, light over dark, or any color over bare drywall pushes you to primer plus two, and sometimes primer plus three for deep reds and yellows.

Write the coat count into the estimate as an explicit line. When a customer later asks why the neighbor's quote was cheaper, "theirs is one coat, mine is two over primer" is an answer. "It's just what I charge" is not.

Labor hours are the estimate

Materials feel like the cost because they're the part you buy. On most residential paint jobs, labor runs somewhere around two thirds to three quarters of the total. Get the hours wrong and nothing else you do to the estimate matters.

A working figure most painters land near is 150 to 350 square feet per hour per painter for rolling, and the spread inside that range is the whole game. Spraying a vacant new build with no furniture, no cut-in, and no masking sits at the top. Brushing and rolling an occupied house with furniture to move, floors to protect, and trim to cut sits at the bottom, sometimes below it.

Then estimate prep separately, because prep does not scale with area at all. Scraping failing exterior paint, filling nail holes, sanding, caulking gaps, patching drywall, and masking are all their own hours, driven by condition rather than size. A small house in bad shape will beat a big house in good shape for total prep time, every time.

• Setup, masking, and protection, per room or per elevation
• Surface repair: patching, filling, sanding, caulking
• Cut-in hours, which scale with trim and opening count rather than wall area
• Rolling or spraying hours from your square foot per hour figure
• Cleanup and final walkthrough

Materials, including the part people forget

Paint coverage is usually quoted around 300 to 400 square feet per gallon for one coat on a smooth surface. Multiply by coats, divide by coverage, then round up to whole gallons, because you buy in gallons and five-gallon buckets rather than in decimals. Interior paint commonly runs somewhere in the twenty to fifty dollar per gallon range, exterior higher, and specialty products higher still.

The forgotten half of materials is everything that isn't paint. Primer, caulk, spackle, sandpaper, tape, masking film, drop cloths, roller covers, brushes, and the sundries that get consumed and thrown away. Some painters carry this as a percentage of paint cost, others as a per-day figure. Either works. Leaving it out entirely does not, and it's the most common gap in an otherwise careful estimate.

Then add the two things that pay you

Everything so far is job cost. Your overhead, the truck payments, insurance, the phone, the person answering it, the software, rent on the shop, has to be recovered across the jobs you actually sell. Applied as a percentage on top of job cost, that commonly lands in the forty to sixty percent range for a small painting outfit, though the honest answer is whatever your books say it is.

Profit comes after that, as its own number, typically in the fifteen to twenty-five percent range. Profit is not your salary. If you're on the tools, your labor hours belong in job cost at your burdened rate, and profit is what the business earns on top for taking the risk. Merging the two is how owners end up working sixty-hour weeks for what feels like a wage.

Worth knowing the difference between markup and margin here, because applying a twenty-five percent markup and calling it a twenty-five percent margin costs you real money on every job you sell.

Where the estimate usually goes wrong

Not in the math. In the information. Most bad paint estimates come from pricing a job three days after walking it, from memory, without the photos in front of you. The ceiling height gets rounded down, the water damage on the north elevation gets forgotten, the customer's comment about wanting the trim a different color never makes it into the coat count.

Whatever you use to capture the walkthrough matters more than the pricing formula. Photos of every elevation and every room, a note on substrate and condition, and a record of what the customer actually asked for will do more for your margins than a more sophisticated rate card. If those photos and that conversation can feed straight into a drafted scope instead of a blank document waiting for you at nine at night, so much the better.

The painters who price well aren't doing harder math. They're just pricing from what was actually there.