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Follow these steps to plan your addition, apply for a permit and book inspections.
This page is for detached, semi-detached or townhouse homes with up to 2 units.
Tip: print this page and use it as a checklist.
On this page:
You need a building permit for any addition that changes your home’s footprint.
If your project includes a separate living unit, use the additional residential units (ARU) page for different requirements.
You don’t have to confirm zoning before you apply, but it can help if your project is complex or your property has unique zoning.
To check zoning in advance, contact zoning at zoning@waterloo.ca or 519-747-8752.
Be ready to provide:
Check the zoning bylaw.
All drawings must be to scale and dated.
Site plan – show lot size, location and size of the proposed addition, distances to property lines, and all existing buildings or structures.
Floor plans – show existing and proposed construction, including:
Structural plans – include details of all structural changes.
Elevations – show existing and proposed elevations.
Cross-section – note materials and dimensions.
Helical piles – include torque calculations and manufacturer documentation. The design must be stamped by a professional engineer if supporting more than an unroofed deck.
Truss layout – sealed by a professional engineer (if proposed).
Engineered joist layout – sealed by a professional engineer or designer (if proposed).
HVAC and mechanical design (Part 6) – required when the dwelling has six or more bedrooms.
Complete the forms that apply to your project.
Contact us if you’re not sure which forms you need.
Forms you need if you’re applying online
Upload these forms with your building permit application (unless they don't apply to your project):
Forms you need if you’re applying in person
Bring these completed forms to the service counter on the 2nd floor of City Hall (unless they don't apply to your project):
Addition permit fee: $1.26 per square foot – HST does not apply.
Pay when you apply:
We’ll start reviewing your application once payment is received.
Submit your application through the building permit portal.
Upload your drawings and forms when you apply.
The typical time to review an addition is 10 business days.
We may ask for more information before approval.
Once approved, your permit package will be available on the portal.
We’ll email you instructions on how to access it.
Print the full package and keep it visible at the work site.
Under the Ontario Building Code Act, you must book inspections before the work is covered.
Find the required inspections listed on your building permit under "Mandatory Inspections".
Book inspections through the building portal (find it on the left menu):
