Project template
Your preparation checklist
Use it as a working list. The final submission still needs to match your actual scope and the City’s current requirements.
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What to do next
- Measure the existing opening
- Define the proposed size/location
- Identify structural framing changes
- Apply before altering the opening
Official sources behind this page
Cambridge lists new windows or doors among typical building-permit projects.
Increasing the size of an existing opening is explicitly given as an example.
Cambridge reviews permit plans for Ontario Building Code and applicable-law compliance.
Need the full project answer?
The main guide keeps the permit trigger, zoning questions, documents, fees, timing and next steps together.
Open the windows / doors guide