A homeowner asks what it costs to paint a bedroom. You can answer per room, per square foot or per hour. Underneath, all three are the same sum: the hours the job takes, times what an hour of your crew has to bring in, plus materials. The method you quote in is a sales choice. The hours are not a choice; they are what the job takes.
For a painting business, the Painting Contractors Association (PCA) gives you two tools for getting the hours right: a standard for measuring surfaces, and standards for prep and color that tell you what you are promising. Its own site also carries a guide to building production rates, written by an estimating-software company. This article puts them together.
Step 1: Measure the way the standard does
PCA Standard P10 exists because, in its words, “there is a relationship between surface area and the amount of labor and materials required,” and when measurement is consistent, “labor production rates and material spread rates may be accurately determined from past painting and decorating work.” Measure every job the same way and last month’s jobs can price next month’s. Its rules that matter most indoors:
Step 2: Time your own production rates
A production rate is how fast your crew does one task. The PCA guide, written for PCA by the software company PaintScout, defines it as “the average amount of time it takes to complete a task,” broken down by square feet per hour, linear feet per hour or hours per item. Its method: time an average painter, not your fastest, working at a comfortable pace; record the surface, the number of coats and anything else that changes the speed; and repeat the timing several times for each surface, because one run is not enough. Its own example is a painter who covers 425 square feet of previously painted walls, two coats, in 5 hours: 85 square feet per hour.
That is their example, not your number. Keep a separate rate for each line you will price:
| Line | Unit | What changes the rate |
|---|---|---|
| Walls | sq ft per hour | Coats, texture, sheen, wall height |
| Ceilings | sq ft per hour | Height, texture, whether the walls are being painted too |
| Baseboard and trim | linear ft per hour | Profile, enamel or flat, caulk needed |
| Doors and frames | hours per item | Panel or flat, one side or two, hardware off |
| Windows | hours per item | Casing only, or sash and muntins |
| Setup and cleanup | hours per room | Furniture, floor protection, distance from the truck |
Step 3: Price prep as its own line
Prep is the part of the job a homeowner cannot see in a photo of the room, and PCA Standard P14 gives you words for it. It defines four levels of surface preparation for repainting:
Two lines in P14 belong in your estimate. A contract may set different levels for different surfaces, “for example, Level 4 on doors and trim and Level 2 on walls” (5.8). And a contract that does not state a level “will be assumed to imply Level 2” (5.9). So name the level, and price the hours for it on their own line. When the homeowner wants the walls smoother, you change one line instead of defending the whole number. If the house was built before 1978 and the prep disturbs paint, the EPA’s Renovation, Repair and Painting rule requires certification and lead-safe work practices; see who needs RRP certification.
Step 4: Coats and color changes
PCA Standard P3 puts the cost of color plainly: “As the number and placement of paint colors increase, labor productivity decreases. As paint colors deepen, application and additional material costs increase.” It sorts interior jobs into color levels, from one color for the whole project (Level I) to unlimited colors and deep tones (Level IV), and says that when the bid documents name no colors, the painter assumes Level II: no more than two colors on the project and one per room. It also says the colors selected must be capable of full, uniform coverage once the specified number of coats is applied according to the manufacturer’s instructions.
Turn that into estimate lines: state the number of coats you priced, state the color assumption, and add a color-change line when the new color is far from the old one, whether that means a primer coat or an extra finish coat. If the homeowner switches to a deep accent wall after the job is priced, that is a change to the contract; see change orders. And promise the finish the standard defines: P1 judges a properly painted surface “without magnification at a distance of thirty-nine (39) inches or one (1) meter, or more, under finished lighting conditions and from a normal viewing position.”
A worked example
Say a painter is pricing a 12-by-14-foot bedroom with 8-foot ceilings: walls, ceiling, baseboard, one door and one window casing, two coats, Level 2 prep, a color close to the old one. The production rates below are placeholders to show the arithmetic; use your own.
That is about 13 hours. Multiply by your billing rate, the figure an hour of crew time must bring in to cover wages, labor burden, overhead and profit (see your real hourly cost and markup vs. margin). At a placeholder $65 an hour, labor comes to $845. Add paint and sundries at your cost plus markup; gallons are the area times the coats divided by the spread rate on the product’s data sheet. If the new color needs a third wall coat, add half the wall hours, 2.6 here, and the extra paint.
For the wage side of that rate, the Bureau of Labor Statistics puts the median pay of construction and maintenance painters at $23.75 an hour in May 2025, with the lowest 10 percent earning less than $37,440 a year and the highest 10 percent more than $78,810. Painting and wall covering contractors employ 42 percent of them, and 31 percent are self-employed. A wage is not a billing rate; the billing rate is what the wage, the burden and the overhead add up to.
Per room, per square foot or per hour?
Once the hours are right, the quoting method is a choice about what the customer sees:
The square-foot trap matters because cost guides publish per-square-foot figures anyone can look up. HomeAdvisor’s interior painting guide, updated June 17, 2026, puts typical interior projects at $965 to $3,089, quotes $2 to $6 per square foot including paint and materials, and lists a bedroom by its 120 square feet at $240 to $720. The same guide says labor makes up 75 to 95 percent of the total cost. A 10-by-12 bedroom with 8-foot walls has 352 square feet of wall, nearly three times its floor area, so ask which square foot any per-square-foot figure means before you compare your price with it.
Whatever method you choose, a homeowner who sees a range before calling arrives knowing roughly what to expect. That is what NapkinPrice™ does: it shows an instant price range on your own website. Whether you use a tool or a simple range table, the range should come from the same production-rate math you use to write the estimate.