Rate 631 is the long-standing rate group for janitorial and building cleaning services. WSIB moved to a classification system based on NAICS industry codes in 2020, and cleaning work now sits inside the Janitorial Services class, but operators still refer to it as Rate 631.
What it means for your pricing:
WSIB is a real cost on every hour billed
You pay a premium as a share of insurable payroll, so it has to be built into your bid price or it comes straight out of your margin.
The 2026 average premium rate is $1.23 per $100 of insurable payroll
That is down from $1.25 in 2025. Your own rate is set off your class plus your individual claims experience, so a clean safety record lowers what you pay relative to the class.
The 2026 maximum insurable earnings ceiling is $121,700 per worker
Earnings above that are not subject to WSIB premiums.
Your exact rate appears on your WSIB premium rate statement, available through your WSIB online account. For your bid, the figure that matters is your real per-hour WSIB cost, which wonable folds into the priced proposal alongside the ESA wage floor.