Interior painting in Ontario: what it costs, and why prep is everything

Painting looks simple until you price it. Here’s what interior painting costs in Ontario, and why the prep — not the paint — decides how the finish holds up.

Fresh paint is the cheapest way to transform a room — but the difference between a job that looks great for a decade and one that peels in a year is almost entirely in the prep.

What it costs

Single room

$400 – $1,200

Main floor

$2,500 – $6,000

Whole home interior

$6,000 – $15,000+

Ranges depend on square footage, ceiling height, how much patching and priming is needed, paint quality, and whether trim, doors, and ceilings are included or walls only.

Why prep drives the price

• Patching, sanding, and priming take real time — often more than the painting itself.
• A big colour change (dark to light) can add a coat.
• Older walls, water stains, or repairs add hours before a brush touches the wall.

When you compare quotes, compare the prep — a low number that skips it isn’t a deal. Describe your project to the HomeCopilot planner for a scope and a realistic range, then get matched with a pro who does the prep right.