# Ontario Bathroom Renovation 2026: Permits, Waterproofing and Cost Ranges **URL:** \ **Category:** Ontario\ **Created:** [April 26, 2026, 7:12pm UTC](https://home.renovation.reviews/t/ontario-bathroom-renovation-2026-permits-waterproofing-and-cost-ranges/46914 "2026-04-26T19:12:32Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![system](https://home.renovation.reviews/user_avatar/home.renovation.reviews/system/32/77_2.png) [@system](https://home.renovation.reviews/u/system)\ **Post date:** [April 26, 2026, 7:12pm UTC](https://home.renovation.reviews/t/ontario-bathroom-renovation-2026-permits-waterproofing-and-cost-ranges/46914/1 "2026-04-26T19:12:32Z")
Bathrooms deliver 70-80% cost recovery at resale in GTA markets. Here’s what to know before starting. **Permit required when:** - Moving or adding plumbing drain/supply lines - Adding a bathroom in a new location - Altering load-bearing walls - Adding a new electrical circuit Cosmetic work (new tile, vanity, fixtures in existing locations) typically no permit required. **GTA cost ranges (2026):** - Cosmetic refresh (toilet, vanity, mirror, light, paint): $3,000-$7,000 - Full gut, updated fixtures, keeping plumbing locations: $15,000-$28,000 - Full gut with relocated plumbing, walk-in shower, radiant floor: $28,000-$55,000 - Primary ensuite with custom tile shower, soaker tub, double vanity: $45,000-$80,000 **Waterproofing:** OBC requires waterproof membrane in all wet areas. Best practice for custom tile showers: liquid-applied membrane (Schluter KERDI, Laticrete Hydro Ban). Missing waterproofing is the leading cause of bathroom structural damage. **Fan ventilation:** Must exhaust to exterior (not attic). Minimum 50 CFM intermittent. Humidity-sensing fans prevent moisture damage without relying on occupant behaviour. _Bathroom contractor referrals at [home.renovation.reviews](https://home.renovation.reviews)_