Canada · Kitchens & baths

What are the building code requirements for bathroom renovations in Canada?

Bathroom renovations that modify plumbing, electrical, or ventilation systems require permits and must comply with plumbing fixture requirements, GFCI electrical protection, mechanical ventilation, waterproofing in wet areas, and accessibility provisions where applicable.

Bathroom renovations are one of the most permit-intensive residential projects because they involve plumbing, electrical, and ventilation in a moisture-critical space. The code regulates fixture placement and connections, GFCI protection for all receptacles, exhaust ventilation capacity, waterproofing and moisture control in shower and tub areas, and accessibility provisions in required barrier-free washrooms.

What to check first

  • Plumbing permits are required for fixture relocation or addition, and connections must meet code.
  • GFCI-protected receptacles and proper electrical grounding are required in all bathrooms.
  • Mechanical exhaust ventilation must meet minimum capacity requirements for moisture control.

Jurisdiction notes

National baseline

The NBC and national plumbing code set plumbing fixture, ventilation, and fire separation requirements for bathrooms.

Provincial electrical code

GFCI requirements and outlet placement rules are set by the provincial electrical code.

Accessibility

Where a barrier-free washroom is required, specific fixture placement, clearance, and grab bar provisions apply.

Not professional advice

CodeCan reports what the published building code says. It is not legal, engineering, or architectural advice, and it does not certify compliance. Building codes are adopted and amended provincially and enforced locally — always verify with your authority having jurisdiction (AHJ) before you build.

Work through it in this order

  1. Determine which code-regulated systems are affected and apply for applicable permits.
  2. Verify plumbing fixture placement, connections, and venting per the plumbing code.
  3. Confirm GFCI protection, grounding, and lighting requirements per the electrical code.
  4. Ensure exhaust ventilation capacity meets code and that wet area waterproofing is properly specified.

Common questions

Do I need a permit for a bathroom renovation?

If plumbing, electrical, or structural changes are involved, yes. Cosmetic-only changes like replacing tiles or fixtures in the same location may not require a permit.

Is a bathroom exhaust fan required?

Yes. The building code requires mechanical exhaust ventilation in bathrooms for moisture control.

What waterproofing is required in a shower?

Shower enclosures require waterproof membranes or materials behind the finish surface to prevent moisture migration into the wall and floor structure.