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Toronto skylight permits

Do you need a permit to install a skylight in Toronto?

Check Toronto skylight permit rules, including the small-building exemption and the structural-member condition.

2 min readReviewed Oct 1, 2026
The short answerConditional

Some skylight installations do not require a building permit when Toronto's listed small-building and structural conditions are met.

Toronto lists skylight installation as permit-exempt when the existing building is a house or small building three storeys or less and the work does not require removal of more than one rafter, joist or similar structural member, except a truss.

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Start with these conditions. The official reference is attached to each one.

Small-building skylightCan be permit-exemptLikely allowed

Toronto lists a skylight exemption for a house or small building three storeys or less when its structural condition is met.

Official sourceCity of TorontoWhen Do I Need a Building Permit? · Permit-required and permit-exempt project examples
Verified2026-10-01Open proof
Structural impactLimited for exemptionConditional

The exemption requires that the installation not remove more than one rafter, joist or similar structural member, with a truss excluded from that allowance.

Official sourceCity of TorontoWhen Do I Need a Building Permit? · Permit-required and permit-exempt project examples
Verified2026-10-01Open proof

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Preparation checklist · Reviewed 2026-10-01

Fees and timing

TimelineConfirm roof framing before cutting the opening. A change that affects more framing than expected can change the permit requirement.
FeesNo building-permit fee applies to an installation that satisfies the City's stated exemption. Structural work can trigger a permit and fee.

Next steps

  1. Confirm the building is within the small-building condition
  2. Identify rafters, joists and trusses before cutting
  3. Check how many structural members are affected
  4. Verify permit needs if the opening expands

A few questions you might have.

Can I install a skylight without a permit in Toronto?

Yes in the specific circumstances Toronto lists: a house or small building three storeys or less, with limited structural-member removal.

What if the skylight opening cuts a roof truss?

Toronto's exemption specifically excludes a truss from the limited-member condition, so that scope should be reviewed before work proceeds.

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