Setting your painting price per square foot

Almost nobody asks a painter what you charge an hour. They ask what it costs to do the living room, the downstairs, or "the house." Your hourly rate never reaches the estimate, but every price comes out of it: hours in, square feet out.

"Per square foot" means two different numbers

Paintable wall surface is what you cover: perimeter × ceiling height, minus doors and windows. Floor area is what the homeowner knows, off the listing.

There is no single multiplier between them. The ratio is just perimeter × ceiling height ÷ floor area, so it moves with ceiling height and with how many walls the plan packs into a footprint. A 12 × 14 bedroom with 8-foot ceilings comes out around 2.2× its floor area after door and window deductions; the same room at 9 feet is about 2.5. A big open room runs lower, a cut-up plan with hallways and closets runs higher. Published whole-house shortcuts run from about 2× for walls only to 3.5–4× with ceilings and trim folded in. Use one to sanity-check a measurement, never to price a job.

That gap is your margin. Quote $1.40 while the customer is thinking $1.40 per square foot of floor and, at 2.2×, you collect about 45 cents on the dollar. Write the unit on the estimate: "420 sq ft of wall area, two coats."

Production rate is what turns hours into square feet

Your hourly rate comes from overhead, take-home and billable hours; that calculation has its own guide. Production is the second number: how much surface you cover in an hour, by task. Time three of your own jobs, split by the tasks in the table below. Only the rolling scales with area, which is why small rooms cost more per foot.

Do not shortcut it with an internet number. Published rates for the same-sounding task run from under 100 square feet an hour to several hundred, because they are not measuring the same work: one figure is rolling only, one coat, on open primed drywall; the next is cutting and rolling two coats on textured walls in a furnished room. Both are printed as "square feet per hour." Brush-and-roll figures quoted across the trade cluster around 200 to 350 an hour on smooth walls, and well under half that on heavy texture. Treat it as a check on your stopwatch, not a substitute, and write down which tasks and how many coats sit inside the number you keep.

Work one real room all the way through

Take a 12 by 14 bedroom with 9-foot ceilings and sound drywall: one door, two windows, walls only, two coats, one color. Perimeter 52 × 9 = 468 square feet. Deduct about 20 for the door and 15 per window, so 50 comes off: 420 square feet of paintable wall, against 168 of floor. The figures below are illustrative.

Check the application rows: 4 hours for 840 square feet of coverage is about 210 square feet an hour, the bottom of the band above and right for a furnished room. At $65 all-in, 6.5 hours is $422.50 of labor.

Material: two coats over 420 square feet is 840 square feet of coverage. Cans typically claim 350 to 400 square feet per gallon, so 840 ÷ 350 is 2.4 gallons — three cans, because you cannot buy 2.4. Read the claim as a ceiling, not a promise: it is measured on smooth, sealed, primed surface, and texture, porous drywall and fresh patch pull it down, sometimes to the 250–300 range. Check the spread rate on the product you actually use. With tape, plastic, caulk and compound, call it $150 of material with markup. Total $572.50 — call it $572.

Divide twice:

• $572 ÷ 420 sq ft of wall = $1.36 per square foot of wall
• $572 ÷ 168 sq ft of floor = $3.40 per square foot of floor

Two numbers 2.5× apart for the same money, because 2.5 is this room's ratio and not a constant. Run your three most common rooms through it and you have a price you can publish:

Standard bedroom repaint, $572. Walls only, two coats, one color, up to 14 × 12, ceilings to 9 feet, minor patching, furniture centered and covered. Trim, ceilings, wallpaper removal and color changes quoted separately.

What to add when the room is not that room

A whole house is that math summed, one setup block instead of one per room. Every clause after that price is a condition priced in hours, not a percentage: change one, add hours, divide again.

When a unit price stops being honest at all, that has its own guide.

The rules that decide what the number collects

Sales tax decides what your number actually collects, and there is no national rule on whether painting labor is taxable. Some states tax the whole charge — labor, primer and paint together — when the work counts as repair and maintenance, which a repaint usually does; others treat painting inside new construction or a capital improvement differently, and the line between the two is drawn state by state. Whether you buy materials tax-free on a resale certificate or pay tax as the end user is the same question. Get it from your state department of revenue, or a CPA who does contractor returns, before you publish a price.

One federal rule does travel. EPA's Lead Renovation, Repair and Painting rule requires firms paid to disturb paint in pre-1978 housing and child-occupied facilities to be certified, use trained certified renovators, follow lead-safe work practices, and give the owner or occupant EPA's "Renovate Right" pamphlet before work starts. Firm certification runs five years. There is a minor repair and maintenance carve-out — six square feet or less of interior painted surface per room, 20 square feet or less on the exterior — but the sanding and scraping in an ordinary repaint blows past that immediately, and window replacement and demolition are covered whatever the area. Some states run their own EPA-authorized version instead, so check whether yours is one, and confirm current requirements on epa.gov, not with a training vendor. If older housing is your bread and butter, the certification cost and the containment hours belong in your overhead and every estimate.

Keeping the rate and the printed number together

The risk now is drift: the rate lives in your head, the square-foot number in an old estimate. In DoneQuote your rate and your wall, trim and ceiling prices go into the catalog once, so the number you worked out is the number that goes out.

Measure before you multiply, and build the price from one real room. The hourly rate stays private and the square-foot number is public; they should be the same number in different clothes.