$2.50 to $6.00 per square foot. That’s the range I see on almost every interior paint estimate I write, and the spread is bigger than most homeowners expect. Why? Because two paint jobs that look the same on paper rarely cost the same in real life.
I’ve been bidding paint work for 20+ years. Some rooms come in at $1.80 per square foot all-in. Others hit $7 because the prep work eats the schedule. The square-foot number is a starting point, not a final answer. If you’re a contractor trying to bid faster, or a homeowner trying to read a bid, the same math drives both sides. Use our Painting Estimate Calculator to skip the spreadsheet, or read on for the manual process.
Quick Answer
Interior paint estimates run $2.50 to $6.00 per square foot of floor area all-in (paint, primer, sundries, labor, overhead). Material alone costs $0.30-$0.80 per sq ft. Labor is $1-$4 per sq ft (BLS painter wages 47-2141). The square-foot number multiplies by the floor footprint, not the wall surface area, because that’s how most homeowners ask for the bid.
Try EstimationPro free and you can plug in a room and have a clean per-sq-ft estimate ready in under three minutes.
Why “Per Square Foot” Is a Shortcut, Not a Formula
Painters quote two ways: per square foot of floor area or per square foot of wall surface. Homeowners almost always think floor area. Pros think wall area. The translation matters.
A 12x15 bedroom has 180 sq ft of floor. The walls are roughly 8 feet tall and 54 linear feet around the room, which gives 432 sq ft of wall. Add a ceiling and you’re at 612 sq ft of paintable surface. The bid the homeowner sees is “180 sq ft at $4.50 = $810.” The bid I’m actually building is “612 sq ft at $1.32 = $807.” Same money. Different math.
Get this clear with the homeowner up front or you’ll end up arguing about the bid later.
The 6-Step Estimate Process I Use
This is the same checklist I run every time. Skip a step and you leave money on the table or eat the overage yourself.
1. Measure the floor and the walls
Pull the floor square footage from the plan or measure it on site. Then multiply the perimeter by the wall height to get wall surface. For a typical 8-foot ceiling room, wall area is roughly 3.4x the floor area.
2. Subtract openings (or don’t)
Pros disagree on this. I subtract doors and windows that take more than 15 sq ft each. Smaller openings, I leave in. The trim work around them eats the time you’d save on the wall area.
3. Pick the paint tier and calculate gallons
Coverage is 300-400 sq ft per gallon (manufacturer specifications, standard for flat walls). Use 350 as your default. Wall area divided by 350, times two coats, plus 10% waste. So 600 sq ft of wall = 600/350 x 2 x 1.1 = 3.8 gallons. Round up. Always.
4. Add primer
New drywall or color changes need primer. Same math as paint, single coat. Standard primer runs $18-$35 per gallon.
5. Estimate labor by sq ft of wall surface
Interior labor is $1-$4 per sq ft of wall surface (BLS 47-2141 painter wages, May 2024 median $48,660/yr). Most production work lands around $2 per sq ft for clean repaints. Bump to $3-$4 if there’s heavy prep, lots of trim, or wood ceilings.
6. Mark up materials and add overhead
I add 20-25% overhead and profit on top of materials and labor (NAHB builder cost data, RSMeans O&P benchmarks). That covers truck, insurance, payroll taxes, and the actual profit you’re trying to take home.
Worked Example 1: Standard 12x15 Bedroom
Let me run real numbers on a typical bedroom repaint, walls only, mid-grade paint.
| Line Item | Calculation | Cost |
|---|---|---|
| Wall surface | 12+15 perimeter doubled = 54 lf x 8 ft = 432 sq ft | n/a |
| Standard paint | 432 / 350 x 2 coats x 1.1 waste = 2.7 gal, round to 3 | $120 |
| Sundries (tape, plastic, rollers) | Per-room flat | $25 |
| Labor at $2/sq ft wall | 432 x $2 | $864 |
| Subtotal | $1,009 | |
| O&P at 25% | $252 | |
| Bid total | $1,261 | |
| Per sq ft floor (180 sq ft) | $1,261 / 180 | $7.00/sq ft |
That $7 number looks high. It’s not, for a single-room job. Mobilization eats your margin on small jobs. The same crew on a 1,500 sq ft whole-house repaint hits $3.50-$4 per sq ft floor because they’re not loading and unloading every day.
Worked Example 2: Whole-House 1,500 sq ft Repaint
Production work, standard paint, walls and ceilings, average prep.
| Line Item | Calculation | Cost |
|---|---|---|
| Wall + ceiling surface | 1,500 floor x 3.8 multiplier | 5,700 sq ft |
| Standard paint (12 gal) | 12 x $40 | $480 |
| Primer (4 gal) | 4 x $25 | $100 |
| Sundries | Whole job | $120 |
| Labor at $0.55/sq ft wall | 5,700 x $0.55 | $3,135 |
| Subtotal | $3,835 | |
| O&P at 25% | $959 | |
| Bid total | $4,794 | |
| Per sq ft floor | $4,794 / 1,500 | $3.20/sq ft |
That’s the spread. Same paint, same crew, half the per-foot price. Volume changes everything.
Regional Multipliers
Wages and overhead vary a lot by metro. Use these as rough adjustments to a national average bid (BLS 47-2141 painter wages, RSMeans city cost indexes, 2024-2026 data).
| Metro | Adjustment vs. National |
|---|---|
| New York / NYC metro | +30% to +40% |
| San Francisco / Bay Area | +25% to +35% |
| Seattle / PNW | +15% to +25% |
| Chicago | +5% to +10% |
| Phoenix | -5% to -10% |
| Atlanta | -10% to -15% |
| Houston / Dallas | -10% to -15% |
Pacific Northwest sits in the higher end of that range. I bid most jobs around $4-$5 per sq ft floor for standard interior work. A buddy in Phoenix bids the same scope at $2.75. Different markets, different cost stacks.
Pricing varies by region, season, and house condition. These ranges are starting points, not quotes.
Common Mistakes That Kill Profit
This is where most contractors lose money on paint work. I’ve made every one of these mistakes at least once.
- Bidding floor area when you’re painting walls. A vaulted ceiling room can have 5x the wall surface of its floor footprint. Quote it on floor area and you’ll eat thousands.
- Forgetting prep time. Patching nail holes, sanding, caulking, masking. On older homes I budget 30-40% of total labor just for prep. New construction needs less. Look at the house before you quote.
- Underestimating trim. Doors, windows, baseboards, crown. Trim takes longer per square foot than walls. I use a separate line item: $3-$5 per linear foot of trim painted.
- Skipping primer on color changes. Going from a deep red to a soft white without primer means 4 coats of finish paint. The primer would have been cheaper.
- Not adjusting for ceiling height. Standard 8-foot bid doesn’t fit a 12-foot great room. Add 15-20% labor for high ceilings (lifts, scaffolding, neck strain that slows the crew).
- No allowance for surprises. I’ve pulled wallpaper off plaster walls and found cracks running floor to ceiling. Pad the bid 10-15% on anything older than 1980.
Field Lessons That Saved Me Money
A few things I wish someone had told me 15 years ago.
- Standard paint is the sweet spot. Behr Premium Plus or Valspar Signature ($30-$55/gal) handles 90% of interior jobs. Premium paint matters on high-end remodels or rentals where wash durability is everything. Economy paint is fine for garages and closets.
- Buy primer in 5-gallon buckets. Saves 15-20% over single-gallon prices and you’ll use it.
- Track your hours per square foot on every job. Three jobs in, you’ll know your real production rate. That’s the number that makes your estimates accurate.
- Quote in writing, even on small jobs. A scribbled number on a notepad is how scope creep eats your margin.
Frequently Asked Questions
How much should an interior paint job cost per square foot?
$2.50 to $6.00 per square foot of floor area for a complete interior repaint with mid-grade paint. Single rooms run higher per-foot ($5-$7) because of mobilization. Whole-house jobs run lower ($3-$4) because the crew is already on site and moving fast.
What’s included in a per-square-foot paint estimate?
A complete bid covers paint, primer, sundries (tape, drop cloths, rollers, brushes), labor, prep work (patching, sanding, masking), cleanup, and overhead/profit. Some bids exclude trim or ceilings. Always read the line items, not just the total.
How do you calculate paint quantity per square foot?
Wall surface divided by 350 sq ft per gallon, times the number of coats, plus 10% for waste. A 1,500 sq ft house has roughly 5,700 sq ft of paintable wall and ceiling. That’s about 16 gallons for two coats with waste. Round up.
Is interior paint cheaper per square foot than exterior?
Yes. Interior labor runs $1-$4/sq ft. Exterior labor is $1.50-$5/sq ft because of weather delays, ladder time, and surface prep on siding. Exterior paint is also more expensive per gallon. Expect exterior to cost 20-40% more per square foot.
Should I get multiple paint estimates?
Always. I tell homeowners to get three bids and compare line items, not just bottom-line numbers. The cheapest bid usually leaves out prep, primer, or a second coat. Make sure every bid covers the same scope or you’re comparing nothing.
How long does a per-square-foot interior paint job take?
A two-painter crew handles 1,500-2,000 sq ft of floor area per week on production work with average prep. Heavy prep, trim-heavy rooms, or premium finishes can cut that in half. I budget 5-7 working days for a standard 1,500 sq ft whole-house repaint.
The Real Reason Estimates Take Forever
Here’s what nobody tells you. The estimate isn’t the slow part. The slow part is the follow-up. You bid a job, you wait. The homeowner gets two more quotes, takes a week to decide, calls back with a question, you re-quote, you wait again. Most jobs I lose, I lose because I didn’t follow up fast enough.
Contractors using EstimationPro report cutting estimate prep from 90 minutes to under 15 minutes per bid, and the platform sends automated follow-up emails so you stop losing jobs in the silence after you send the proposal.
Try EstimationPro free. It builds the estimate, generates a clean proposal, sends it, and follows up with the homeowner automatically. You write the bid once. The system chases the close. That’s the difference between a contractor who works nights and weekends and one who actually gets home for dinner. If you also need a quick takeoff before you bid, our Paint Calculator will run the gallons in seconds.
1,500 sq ft Interior Paint Job (Mid-Grade) Line Items
Paint Quality Tiers (Per Gallon)
- Builder-grade contractor paint
- Often needs 3 coats over color changes
- Lower scrub rating
- Best for closets, garages, rentals
- Behr Premium Plus, Valspar Signature
- 2 coats handles most jobs
- Solid scrub rating for kitchens and baths
- Sweet spot for production work
- Sherwin-Williams Emerald, Benjamin Moore Aura
- Often 1-2 coats with rich coverage
- Best wash rating, color depth
- Worth it on high-end remodels
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