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Measure the actual surfaces (walls, ceilings, trim, doors), apply your crew's production rates to get labor hours, price materials from a coverage calc, then add overhead and markup to hit a 30-50% gross margin. Room-price rules of thumb ($350-$800 a room, ~$2-$6 per sq ft of floor) are only a sanity check — build the real number from measurements so prep-heavy jobs don't lose money.
Why Room-Price Guessing Fails
Plenty of painters quote by feel — "that's a $600 room." It works until it doesn't. Two rooms of the same size can be wildly different jobs: one has smooth walls in good shape and takes one coat; the other has patched drywall, high ceilings, dark walls going light (three coats), and a day of prep. Quote both at $600 and the second one loses money.
The fix is to estimate from the actual surfaces and the actual work, not a memorized room price. It takes a few more minutes and it is the single biggest lever on whether a painting business is profitable. The method below is how the pros do it.
The Estimating Method
Measure the surfaces
Measure the paintable area of each surface type separately: walls (perimeter x height, minus openings), ceilings (length x width), and trim, doors, and windows by count or linear feet. Surface type matters because each paints at a different speed.
Apply production rates
Multiply each surface by your crew's production rate (square feet per hour, including prep) to get labor hours. Walls roll fast; trim and doors are slow per square foot. This converts area into real hours instead of a guess.
Add prep time honestly
Prep is where estimates die. Patching, sanding, caulking, masking, and priming can equal or exceed the painting time on an older home. Walk the job and add prep hours explicitly — do not bury them.
Price the materials
Calculate paint from coverage (about 350-400 sq ft per gallon per coat) times your number of coats, plus primer, caulk, tape, plastic, and sundries. Mark materials up over cost.
Add overhead and profit
Layer overhead (insurance, vehicle, software, marketing) and your target profit onto labor plus materials. Aim for a final price with a 30-50% gross margin.
Production Rates
Production rates are the engine of an accurate estimate: how much of each surface one painter completes per hour, prep included. Your real rates come from timing your own crew, but these ranges are a reasonable starting point for interior repaints:
| Surface | Typical production rate | Notes |
|---|---|---|
| Walls (roll) | 150-200 sq ft/hr | Faster on open, smooth walls; slower with cut-in |
| Ceilings | 150-250 sq ft/hr | Faster if sprayed; slower rolled overhead |
| Trim / baseboard | 50-100 linear ft/hr | Prep and taping drive this more than paint |
| Doors (per side) | 2-4 doors/hr | Panel doors slower than flat; spraying faster |
| Windows | 1-3 per hr | Depends heavily on divided lites and masking |
Track your own rates. The single most valuable thing you can do is time a few real jobs and calculate what your crew actually produces per hour. Once you know your true rates, your estimates stop being guesses — and you can bid tighter than competitors who are padding for uncertainty.
2026 Price Ranges
Use these only as a sanity check against your built-up estimate, not as your quoting method. Ranges vary widely by region, prep, and coats.
| Job | Typical range |
|---|---|
| Interior, per sq ft of floor | $2-$6 |
| Standard interior room | $350-$800 |
| Interior, whole home (per sq ft) | $3-$7 |
| Exterior, per sq ft | $2-$5 |
| Labor as % of price | 50-70% |
Materials and Markup
Materials are usually 15-25% of a residential repaint — labor is the bigger cost. Calculate paint from coverage: about 350-400 square feet per gallon per coat. A 12x12 room with 8-foot ceilings has roughly 384 sq ft of wall; two coats is about 2 gallons. Add primer where you are covering dark colors or bare patches, plus caulk, tape, plastic, and sundries.
Mark materials up 15-50% over your cost — you are carrying, transporting, and warrantying them. Then price labor to hit your target gross margin. The final number should have labor, materials, and overhead all covered with a healthy net profit left over. If your quote does not clear a 30% gross margin, re-check your hours or your rate, not just your paint cost.
Estimating Mistakes
- Underestimating prep. The number-one profit killer. On older homes, prep can equal painting time. Walk it and price it explicitly.
- Forgetting coats. Dark-to-light, bare drywall, and drastic color changes need extra coats. One missed coat can halve your margin.
- No production rates. Without them you are guessing hours, which means padding on some jobs (and losing bids) and underbidding others (and losing money).
- Not itemizing the estimate for the customer. A clear, itemized quote wins more jobs at higher prices than a single scribbled number — and it protects you on scope.
- Never updating your rates. Paint and labor cost more every year. Re-check your material costs and labor rate at least annually.
Software That Builds the Estimate
You can estimate on paper, but painting estimating software does the surface math, applies your production rates, prices materials, and turns out a clean itemized proposal in minutes — then follows up on it. For a painting business quoting several jobs a week, that speed wins more work at better margins. Two tools lead the category.
PaintScout is built for painters. You enter surfaces and it applies production rates to produce accurate labor hours and a polished, itemized proposal your customer can approve online. See our painting estimating software guide for the full breakdown.
DripJobs pairs estimating with automated follow-up — the texts and emails that turn a quote into a signed job. If you are losing work by not chasing quotes, the CRM side pays for itself. More in our painting CRM guide.
Frequently Asked Questions
- How do painters estimate a job?
- Measure the surfaces, apply production rates to get labor hours, price materials from a coverage calculation, then add overhead and markup. See the step-by-step method.
- How much should I charge to paint a room?
- A standard interior room runs $350-$800 depending on size, height, coats, and prep — but use that only as a sanity check against a real, measured estimate.
- What is a production rate?
- How much of a surface one painter completes per hour, prep included. Walls roll at 150-200 sq ft/hr; trim and doors are much slower. See the production rate table.
- What markup should I add to materials?
- 15-50% over cost on materials, with labor priced to hit a 30-50% gross margin on the whole job.
Estimate from surfaces and production rates, never from a memorized room price. Measure each surface, apply your crew's real production rates for honest labor hours, add prep explicitly, price and mark up materials, and layer on overhead and profit to a 30-50% gross margin. Once you are quoting several jobs a week, let PaintScout build the estimate and proposal, or DripJobs if you also want a CRM to chase and close the quotes.