Estimate your 2026 Seattle interior painting project per room or whole-home. Configure dimensions, paint tier (builder-grade through Benjamin Moore Aura / Sherwin-Williams Emerald), wall condition, and trim / door scope. The calculator returns an itemized material, labor, and paint-gallons-needed breakdown so you can compare contractor bids apples-to-apples.
This is the tool version of our Seattle Interior Painting Cost (2026): $1.01–$2.02/sqft, by Room Type, which walks through current labor rates, paint prices per gallon, quality-tier tradeoffs, and timing tips. Read the guide for context; use the calculator below for a specific number.
New drywall and good condition take the same prep time. Poor condition adds patching and sanding. Primer is priced only when Include Primer Coat is on.
Your Estimate
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Add your room details
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How Our Interior Painting Cost Calculator Works
Professional interior painting estimates for Seattle homeowners
Accurate Cost Estimation
Our interior painting calculator prices Seattle-area repaints room by room from Kolmo's own paint catalog and labor rates.
For each room you enter the length, width and ceiling height, the number of doors and windows, whether the ceiling and trim get painted,
the wall texture (smooth, light or heavy), the surface condition (new drywall, good or poor), the trim complexity, and whether the room is
empty or furnished. For the whole job you choose a paint tier and whether a primer coat goes on. Paint is billed by the gallon for each
surface: walls, ceilings and trim are separate lines, each with two coats and a 10% waste allowance. Every labor line bills $62 an hour.
Walls over 10 feet, heavier texture, complex trim and furnished rooms each add labor time, and a major color change adds wall coats.
What The Calculator Includes
Every estimate is itemized, and the lines add up to the total. Materials are the paint for walls, ceilings and trim, each billed by
the gallon at your tier's price, plus a PVA primer line when you turn primer on. Labor is split into surface prep and masking, painting,
final cleanup and touch-up, and primer application when selected, all at $62 an hour. Prep is the line that moves with condition: on a
single 12x12 bedroom in good condition it is 7.3% of the labor hours, on a 15-room walls-only repaint in good condition 8.4%, and on a
15-room home in poor condition with ceilings, trim and primer 34.2%. Higher paint tiers cost more per gallon and take a little longer to
apply, so choosing one raises both the paint lines and the labor lines. There is no permit line. Small jobs are raised to a job minimum,
shown as its own line.
Seattle-Specific Considerations
Seattle's housing stock shapes interior repaints. Bathrooms and kitchens see steady humidity, so a mildew-resistant finish is worth
considering there; in the calculator that means choosing a higher paint tier, and we confirm the product at the walkthrough. Many homes
built before 1980 have plaster walls that need more patching, which the poor-condition setting prices as extra prep time. Popcorn ceiling
removal is not in the calculator. Homes constructed before 1978 may contain lead paint, and lead-safe work practices are scoped at the
walkthrough rather than priced in the calculator. Washington requires contractors to be registered with L&I, bonded and insured, and the
rates in this tool are those of a registered, insured crew, which protects you from liability if an accident occurs on your property.
Using The Calculator Effectively
To get the most accurate estimate, measure each room with a tape measure and enter its length, width and ceiling height in feet,
along with its doors and windows. Turn ceilings and trim on only for the rooms where you want them painted; each adds its own paint and
labor. Pick the paint tier by how the room is used: a basic tier is fine for closets and storage, while hallways, kitchens and bathrooms
benefit from a more durable finish. Choose the surface condition the walls are actually in. "Poor condition" adds patching and sanding
time and gives you a realistic budget for walls that need it. Mark a room as furnished if the furniture stays, since working around it
takes longer. The estimate returns the total, the material and labor split, the square footage painted, the labor hours and a time estimate
in working days, and you can change any input to see how the number moves.
Interior Painting Cost Calculator: common questions
How accurate are the calculator estimates?
Each estimate is shown as a range, 15% below to 15% above the point total, for standard conditions. Final costs may vary based on unforeseen wall damage, additional prep work requirements, or material selection changes. We use current Seattle market rates updated regularly to reflect real contractor pricing.
What is not included in the estimate?
Estimates do not include furniture moving (though we factor in empty vs. furnished rooms), extensive wall repairs beyond standard spackling, popcorn ceiling removal, wallpaper removal, or lead paint abatement. These services require separate quotes as costs vary significantly based on specific conditions discovered during inspection.
Why are Seattle painting costs higher than national averages?
Seattle's higher cost of living translates to higher labor rates for skilled tradespeople. Washington requires contractors to carry a bond and insurance and to register with L&I, which protects you but adds to contractor overhead. Licensed, bonded contractors provide legal protection and accountability that unlicensed painters cannot offer. The calculator itself adds no permit line to an interior repaint.
Why trust this interior painting estimate?
Kolmo LLC, established 2025, is a licensed, bonded and insured Washington general contractor (License #KOLMOL*753JS) working across Seattle and King County. This interior painting calculator prices from Kolmo's own material catalog and labor rates, not national averages. Every estimate returns an itemized breakdown of materials and labor, and the line items reconcile to the total so you can check the arithmetic yourself, and the cost of every option you switch on appears as its own line. Treat the result as a planning estimate rather than a quote: the final price is set after a walkthrough of the actual conditions, which is free and carries no obligation.
What this calculator captures
What the calculator returns for common Seattle jobs in 2026. A whole home runs from about $2.25 per sq ft of home for walls only up to about $4.05 with ceilings, trim, doors and premium paint.
One 12x12 room
$380-$705
Walls only in builder-grade paint at the low end; ceiling, trim, a door and premium paint at the top.
Whole home, about 1,900 sq ft
$4,250-$7,650
Fifteen rooms. Walls only in builder-grade paint at the low end; walls, ceilings, trim and doors in premium paint at the top.
Heavy prep + luxury paint
From $13,000
The same home with every room in poor condition, luxury paint and a primer coat.
Using this calculator
Does the calculator include surface prep and drywall patching?
Yes. Each room has a surface condition: new drywall, good, or poor. New drywall and good condition take the same prep time, which covers light patching and caulking; poor adds patching and sanding time, about $0.32 per sq ft of painted surface on a whole home. Lead-safe work on a pre-1978 home is not in the calculator — we scope it at the walkthrough.
How does paint tier (builder-grade vs premium) affect the estimate?
Builder-grade paint is $35 a gallon, premium $62, eco $65, luxury $85 and designer $110. Every tier gets two coats, and a dark-to-light color change adds a coat. The premium lines take a little longer to apply, so they add labor as well as paint: on a whole home, premium instead of builder-grade adds about $1,400.
Are trim and doors priced separately?
Yes. Trim is a per-room toggle priced by the linear foot, about $0.66 a foot. Each door you count adds its casing and the cutting-in around it, about $14 a door. Painting door slabs is quoted at the walkthrough.
Does it account for Seattle high-moisture rooms (bathrooms, basements)?
Not separately. Bathrooms and basements price like any other room; if you want a mildew-resistant finish, choose a higher paint tier, and we confirm the product at the walkthrough.
Can I estimate accent walls or color changes per room?
The calculator prices one color scheme for the job. A major color change — dark to light — adds a coat of paint and the labor for it in every room. Accent walls are quoted at the walkthrough.
