Windsor By-law 148-2025, s. 5.2.13(a) — Building and Property Standards By-law

Stairs – Interior – Single Unit Dwelling The stair tread rise and run for residential interior single dwelling unit shall not exceed the following unless existing acceptable to the Officer:

• (i) Maximum rise 210 mm
• (ii) Minimum tread 230 mm
• (iii) Minimum run 200 mm
• (iv) If run is less than 240 mm, a 25 mm nosing is required
• (b) Stairs – Residential – Not Within
• (i) Maximum rise 210 mm
• (ii) Minimum tread 240 mm
• (iii) Minimum run 212 mm
• (iv) If run is less than 240 mm, a 25 mm nosing is required
• (b) Stairs – Non-residential
• (i) Rise minimum 125 mm, maximum 200 mm
• (ii) Minimum run of 230 mm, must be uniform
• (iii) If run is less than 240 mm, a 25 mm nosing is required
• (iv) Existing winders of not more than 3 in 90 degrees and not more than 1 set between floors are permitted and where each tread is not less than 30 degrees and each tread is not greater than 45
• (c) Stairs – Service Rooms – curved/spiral Stairs may exceed the requirements in 1.13
• (c) if serving only service rooms, service spaces and other rooms unused in industrial occupancies serving equipment and machinery, or existing curved and spiral stairs in dwelling units acceptable to the officer.