Walk the job before you price it
Every accurate painting estimate starts on site. Guessing from a phone call is how you end up paying to work. Walk each room or each side of the exterior, and write down what you see: surface condition, ceiling height, number of colors, and anything that slows you down like heavy furniture, stairwells, or landscaping tight against the siding.
Take photos of problem areas: peeling trim, water stains, cracks, chalky siding, or patched drywall. Those photos protect you later if the customer forgets what shape the surface was in, and they remind you what you priced when you come back to start the job.
Measure and photograph on the first visit. Going back for a second look costs you an hour you will never bill for.
Measure the paintable square footage
For interiors, measure each wall: length times height gives you wall square footage. Add ceilings separately (length times width). Subtract only the big openings like doors and large windows; small ones barely change the paint you use, and the time spent cutting around them balances it out.
For exteriors, measure the perimeter of the house times the wall height, then adjust for gables and subtract large openings. Keep trim, doors, shutters, and railings as separate counts, usually by linear foot or by piece, because they take more labor per square foot than flat wall.
The number you end up with is your billable square footage. Everything else in the estimate hangs off it.
Count prep, coats, and materials
Prep is where painting jobs are won or lost, and it is the part new estimators undercount most. List every prep task the surface actually needs, then decide how many coats each surface gets. Two finish coats over a color change or bare patches is a different job than one maintenance coat over the same color.
Work out materials from the measured area. Paint coverage per gallon is printed on the can by the manufacturer, so divide your square footage by that rate, multiply by the number of coats, and round up. Do the same for primer where the surface calls for it.
- Washing, scraping, sanding, and deglossing
- Caulking, patching, and spot priming
- Masking, plastic, drop cloths, and tape
- Primer plus the number of finish coats
- Paint gallons by surface and by color
- Sundries: rollers, brushes, trays, and blades
Turn measurements into line items
Price labor from your own production rate. If you know from past jobs how many square feet of wall your crew paints per hour, divide your billable square footage by that rate to get labor hours, then multiply by your loaded hourly cost per person, including payroll burden, not just wages.
Materials go in at your actual cost, including delivery. Overhead (insurance, vehicle, phone, marketing, your own estimating time) and profit go on top as your markup. Markup is a business decision you make from your numbers, not a number you copy from the internet.
| Line item | How you size it |
|---|---|
| Prep labor | Hours per task, from the walk-through list |
| Paint labor | Billable sqft divided by your production rate |
| Paint and primer | Sqft divided by coverage on the can, times coats |
| Sundries and masking | Small percentage of materials, or a flat per-room figure |
| Overhead and profit | Your markup on top of real costs |
Mistakes that eat your profit
- Pricing from the customer's description instead of a site visit
- Counting one coat when the color change or surface condition needs two
- Ignoring prep time because it does not feel like painting
- Forgetting trim, closets, and ceilings in the room count
- Quoting wage-only labor and leaving payroll burden and overhead unpaid
- Not stating exclusions, so drywall repair becomes your free add-on
What the customer should see
A finished painting estimate should read like a scope of work: the areas covered, the prep included, the number of coats, the paint line or grade you priced, and what is excluded, like drywall repair or moving furniture. Add your business details, the total, and how long the price is valid.
You can build this on site with an app like EstimateBook: describe the job by voice or snap photos of the rooms, and it drafts itemized line items you can edit for quantities, prices, and markup before sharing a polished PDF. Treat any draft as a starting point and check it against your measurements before it goes to the customer.