How we estimate interior painting cost
Every estimate combines a national price for each part of the job with a local labor adjustment for your province. Here is exactly how that works and where the numbers come from.
The formula
For each line item we multiply a quantity (driven by your wall area, number of coats, prep level, and paint grade) by a national unit cost, then apply a quality-grade factor. A regional labor multiplier is applied to the labor portion only — materials are priced nationally. We show the itemized result as a ±18% range.
National unit costs
| Line item | National unit cost | Source |
|---|---|---|
| Surface prep & masking | $0.41 / sq ft | ref |
| Primer coat | $0.29 / sq ft | ref |
| Wall paint | $0.15 / sq ft | ref |
| Wall painting labor | $0.52 / sq ft | ref |
| Ceilings | $0.87 / sq ft | ref |
| Trim, doors & windows | $4.05 / sq ft | ref |
Regional labor multipliers
Each province's labor multiplier is its median painter wage relative to the national median, from the Government of Canada Job Bank wage data (Painter, NOC 73112); the three territories where Job Bank suppresses painter wages carry a disclosed territorial carpenter-wage proxy. Multipliers are bounded to a sane range and applied to the labor share of each line item, so materials stay nationally priced while labor tracks local wages.
Data vintage & limitations
Compiled June 2026 from public cost aggregators and government wage data — these are derived estimates, not live contractor quotes. Local prices vary with project complexity, access, and material availability; always confirm with a licensed contractor before budgeting.