Canadian building code question

What are the building code requirements for sunrooms and solariums in Canada?

Sunrooms and solariums must meet structural glazing requirements, energy code provisions, and may need to be thermally separated from the main dwelling. Requirements depend on whether the space is heated, how it connects to the house, and the province's energy code.

Sunrooms and solariums are popular additions, but they sit at the intersection of structural, energy, and glazing code requirements. A heated sunroom that is open to the main living space is treated differently from an unheated, separated solarium. The energy code implications are significant because large glazing areas can affect whole-building energy compliance. Safety glazing, structural loading for the glazing system, and foundation requirements complete the code picture.

What to check first

  • Heated sunrooms open to the main dwelling must meet full energy code requirements for the glazing and envelope.
  • Unheated sunrooms separated by an exterior-rated wall and door may receive different energy code treatment.
  • Safety glazing, structural wind and snow loads on glazing systems, and foundation requirements all apply.

Jurisdiction notes

National baseline

The NBC sets structural, safety glazing, and general construction requirements for sunrooms.

Energy code

Energy code treatment varies significantly based on whether the sunroom is heated, separated, and how the province classifies the space.

Municipal permits

Sunroom additions typically require building permits and may trigger zoning setback or lot coverage reviews.

Work through it in this order

  1. Determine whether the sunroom will be heated, separated from the main dwelling, or both.
  2. Check how the provincial energy code classifies the sunroom for glazing area and thermal performance requirements.
  3. Verify safety glazing requirements for all glazing in the sunroom assembly.
  4. Confirm structural load requirements for the glazing system and foundation.

Common questions

Can a sunroom be exempt from energy code requirements?

Some provinces allow exemptions for unheated sunrooms that are thermally separated from the main dwelling, but the specific criteria vary.

Do sunroom walls need insulation?

If the sunroom is heated and open to the dwelling, all walls and glazing must meet energy code thermal requirements.

Do I need a permit for a sunroom?

Yes. Sunroom additions change the building footprint and typically require a building permit.