Does replacing a window the same size need a permit in Ottawa?

No, replacing a window with the same size window in an existing opening typically does not require a building permit in Ottawa. This is considered maintenance and repair work under the Ontario Building Code.

Window replacement permits are only required when you're making structural changes to the building. This includes creating new window openings, enlarging existing openings, or removing structural elements like headers or load-bearing components. If you're simply removing an old window and installing a new one in the exact same rough opening, no permit is needed.

However, the installation must still meet Ontario Building Code requirements even without a permit. This means proper flashing, air sealing, insulation, and ensuring the new window meets current energy efficiency standards for Ottawa's Climate Zone 6. Experienced installers are familiar with these code requirements and install accordingly.

There are some exceptions to consider. If your home is designated heritage property, you may need heritage approval even for same-size replacements. Additionally, if you discover structural issues during the replacement that require repair, those structural modifications could trigger permit requirements.

For peace of mind, an experienced installer will keep the work code-compliant without the hassle of permit applications. Professional installers carry WSIB coverage and liability insurance, protecting you from potential issues during the replacement process.

For a quote on a like-for-like replacement, go through Ottawa Window Pros — and ask the installer to confirm what your specific job needs for code compliance.