Estimating painting cost means building up from measured quantities to a bid price. The build up is: materials + labor + equipment = direct cost, then + overhead = job cost, then + profit = bid price. Each layer has a range, not a fixed number, and your actuals depend on region, project size, surface condition, and risk.
What You Are Pricing
A painting estimate is not a single number per square foot. You are pricing four things: the surface prep, the coating system, the application labor, and the mobilization to get crew and gear to the job. Interior repainting is a different animal than new construction, and exterior work adds weather, access, and substrate issues that change the number fast.
Start by separating the scope. Walls, ceilings, trim, doors, and cabinets each carry their own production rate and material cost. Trim and doors eat labor because you cut in by hand and every linear foot is slow. Ceilings are fast to roll but drywall repair on ceilings kills your budget if you did not price it. Walls are the easiest to predict. Cabinetry is a specialty scope that you should bid separately, often at a per door or per linear foot rate, not lumped into the wall square footage.
Measure paintable area, not floor area. A 2,000 SF house with 8 foot walls typically yields 7,000 to 7,500 SF of paintable wall and ceiling surface once you back out openings. A 10 foot ceiling pushes the paintable area up roughly 25%. Measure the actual wall and ceiling square footage, subtract doors and windows (about 20 SF per door, 15 SF per average window), and that is your coating quantity.
Direct Cost Buildup
Direct cost is what you spend on the job: materials, labor, and equipment. Build each one from a unit, then add them.
Materials. Paint coverage runs 350 to 400 SF per gallon on a smooth, primed wall and 250 to 300 SF per gallon on rough or dark surfaces. For 7,200 SF of paintable surface at 350 SF per gallon you need about 21 gallons for one coat. Two coats on walls, one on ceilings, is the common residential spec, so plan material for the actual coat count. Price paint by the gallon: contractor grade at $25 to $40, premium latex at $45 to $70, specialty or epoxy coatings higher. Add primer separately at $20 to $35 per gallon. Do not forget consumables: caulk, spackle, tape, drop cloths, roller covers, and brush cleaner typically add 5 to 8% to the paint cost.
Labor. Production rates drive the number. A two person crew rolling walls typically lays down 200 to 250 SF per hour per painter on new construction, and 120 to 180 SF per hour on repaint work where you are cutting in, masking, and working around furniture. Trim runs 30 to 50 linear feet per hour. Ceilings run 250 to 300 SF per hour with a pole and an 18 inch nap. Multiply hours by your burdened wage: a journeyman painter runs $22 to $45 per hour loaded, a helper $15 to $25. Burdened means wage plus workers comp, payroll taxes, and benefits, typically 25 to 35% over the base wage.
Equipment. Sprayers, ladders, scaffolding, lifts, and pressure washers. For interior you may have nothing more than ladders and rollers you already own, so equipment is a small allowance. Exterior work on a two story house often needs a boom lift at $300 to $600 per week, or pump jack scaffolding at $150 to $250 per day. Pressure washing ahead of an exterior repaint runs $0.10 to $0.20 per SF.
Step by Step Cost Estimate
For a representative interior repaint, 2,000 SF house, 7,200 SF paintable, two coats walls one coat ceilings:
- Quantities: 7,200 SF paintable, 22 gallons paint, 6 gallons primer, 1,200 LF trim, 12 doors.
- Materials: 28 gal at $45 avg = $1,260. Primer 6 gal at $25 = $150. Consumables and tape = $130. Trim paint 2 gal = $90. Total materials = $1,630.
- Labor: Walls 4,800 SF at 150 SF/hr = 32 hr. Ceilings 2,400 SF at 275 SF/hr = 9 hr. Trim 1,200 LF at 40 LF/hr = 30 hr. Doors 12 at 0.5 hr = 6 hr. Prep and masking 8 hr. Total 85 hr at $30 loaded = $2,550.
- Equipment: Ladders and sprayer allowance = $150.
- Direct cost: $1,630 + $2,550 + $150 = $4,330.
Factors That Move the Number
Surface condition is the biggest swing. A clean primed new wall is cheap to paint. A wall with peeling lead paint, water damage, or heavy texture needs prep that can double the labor. Price prep separately: scrape and sand at $0.15 to $0.40 per SF, drywall repair at $40 to $80 per patch, full skim coat at $0.75 to $1.50 per SF.
Access changes exterior numbers fast. A single story with walkable ground is the baseline. Second story, steep slopes, and shrubs against the house all slow the crew and may force scaffolding or a lift. Count the height and the obstacle cost.
Coating quality and color jumps matter. Dark over light needs three coats. Satin and semi gloss show prep flaws so prep labor rises. Specialty coatings, elastomerics, and epoxy floor paint carry higher material cost and slower production.
Crew makeup and productivity. A lead painter plus two helpers outproduces three leads at a lower blended rate, but only if the leads manage the helpers. Use your real production history, not a textbook number.
Common Mistakes
- Using floor area instead of paintable wall and ceiling area. They are not the same and the gap widens with ceiling height.
- Using a markup instead of a margin. They are not the same. 10% markup on a $4,330 direct cost gives $4,763, while 10% margin gives $4,811. On a tight bid that gap loses jobs.
- Forgetting to burden the labor rate before marking up. Base wage plus 30% burden is the number that goes into the estimate.
- Setting one profit number for every job regardless of risk. A small fiddly repaint with three colors and bad access is not the same profit as a 5,000 SF new build in one color.
- Not checking the bid price against a square foot or unit cost sanity check. If your bid is $2.20 per SF and the market runs $1.80 to $2.40, you are in range. If you are at $4.00, recheck your math.
- Ignoring mobilization and cleanup. Load in, load out, and final clean are real hours.
Putting It Together
Take the $4,330 direct cost from the worked example. Apply overhead at 15% of direct cost = $650. Apply profit at 10% of (direct + overhead) = $498. Bid price = $5,478. That is about $2.74 per SF of floor area, or $0.76 per SF of paintable surface, which sits in the common residential repaint range of $1.50 to $3.50 per floor SF for interior work.
Exterior repaint typically runs $1.25 to $3.00 per SF of wall surface, and new construction interior paint runs $0.80 to $1.50 per SF of paintable area because there is no prep, no masking of furniture, and no cutting in around occupied rooms. Use these ranges as a sanity check against your build up, not as a substitute for measuring the actual quantities and building the unit costs yourself.
Numbers are illustrative and vary by region, project size, and material choice. Use them as a sanity check, not a bid. Use your actual overhead and target profit from your books.