Know what matters
Know what applies to your project.
Check the conditions below before you finalize the scope. Every answer connects to an official source.
Whitby lists structural alterations, including adding windows or doors, among permit-required work. Do not treat this as a determination for a same-opening replacement.
Source · Town of Whitby
Building Permits · Residential permit types including decks, basements, garages, additions and ADUs
Verified Oct 1, 2026Open official sourceMake a start
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Plan ahead
Fees and timing
From reading to doing
Your next steps.
- Record the scope: existing and proposed opening width, height and location.
- Gather: wall construction, lintel and structural support changes.
- Compare the exact scope with this municipal statement: Whitby lists structural alterations, including adding windows or doors, among permit-required work. Do not treat this as a determination for a same-opening replacement.
- Ask which documents, fees and inspections apply to this exact scope; keep the written response with the project records.
- Resolve approvals before committing to a construction start date.
Trace the evidence
Official sources behind this guide.
These are the source documents linked in the rules above. Check the municipal authority for current requirements before submitting a project.
- Town of Whitby
Building Permits · Residential permit types including decks, basements, garages, additions and ADUs
Source verified Oct 1, 2026
A little more clarity
Common questions.
What should I ask before starting a windows and doors project?
Does this scope qualify as a same-opening replacement, or is an opening alteration permit required?
Does this approve my property-specific project?
No. The published general guidance is verified; zoning, exact scope and other approvals still need to be resolved for your property.
Do you need a permit for windows and doors in Whitby?
Whitby lists structural alterations, including adding windows or doors, among permit-required work. Do not treat this as a determination for a same-opening replacement.
Know the approval terms
The permit decision can involve more than one rule.
Use these plain-language definitions to understand the conditions above, then check the official source for your municipality.
Building permit
A municipal approval required before certain construction, alteration, demolition or change-of-use work can proceed. The permit review checks the proposed work against the Ontario Building Code, local zoning and other applicable law.
Applicable law
Requirements outside the Ontario Building Code that must be satisfied before a building permit can be issued when the Building Code identifies them as applicable law.
Same project, different city
See how this rule changes across Ontario.
Compare the source-reviewed answer for this project across every municipality BuildRules currently covers.
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