Does a bigger skylight need a City of Calgary permit?

Yes, a larger skylight requires both a development permit and a building permit from the City of Calgary. That applies whether you are going bigger or smaller; any size change triggers the dual-permit requirement. Replacing a skylight with one of the exact same size does not need a permit.

Why the Size Change Matters

A skylight opening is a structural modification. Cutting a bigger hole in the roof deck means altering the rafters or trusses around it, which is structural work. That takes the project outside the re-roofing exemption under Alberta's Permit Regulation, which only covers work done for appearance or maintenance using a similar type of material with no structural change. Once you are cutting into the structure, the City needs to review the plans.

The development permit addresses land-use and design considerations (how the skylight affects the building's appearance and massing). The building permit covers the structural and weatherproofing work itself, and a Safety Codes Officer will inspect it. You apply for both through the City of Calgary.

If there is any structural damage around the existing opening, the City's guidance is to bring in a structural engineer before the work begins, regardless of whether the skylight size is changing.

A few practical points worth knowing before you start:

• Get the permits pulled before any work begins, not after. Unpermitted structural alterations can complicate a future sale or an insurance claim.
• The contractor should be the one to arrange the permits, but confirm this in writing in the contract before signing. The contract should also state who pays the permit fees.
• A Calgary residential alteration permit runs roughly $206 in 2026 (a processing fee, a base fee, and a Safety Codes Council levy). A development permit fee varies by project; confirm the current amount with the City directly.
• The roofing work around the new opening, including the flashing and the eave protection (ice-and-water shield) where required by the National Building Code, needs to be done to code. Calgary's freeze-thaw cycle and roughly 128 temperature swings a year make proper flashing around a skylight especially important; a poorly flashed skylight is one of the more common sources of interior water damage here.

On the re-roofing side: if a roofer is replacing the shingles around an existing same-size skylight at the same time, that portion of the work does not need a permit on its own. The permit requirement is triggered by the skylight size change, not by the shingle work.

Check with the City of Calgary's permit office to confirm current fees and application requirements before your contractor starts, since details can shift between fee schedule updates.