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Follow these steps to plan your additional residential unit project, apply for a permit and book inspections.
This page is for residential detached houses, semi-detached houses, town and row houses with a maximum of 2 units.
Tip: print this page and use it as a checklist.
On this page:
Before you start, review these steps and gather key details about your project:
If your project involves creating an additional residential unit in your basement or on your main floor visit our page for ARUs in basements or main floors.
You need a building permit if your ARU adds to your home’s footprint.
Before applying, make sure your proposed ARU follows all zoning and planning rules:
Your site plan must show:
Your floor plans must show:
Structural Plans – detail any structural changes being made.
Elevations – Elevations are required, detailing the existing and proposed elevation.
Cross Section – noting materials and dimensions
Helical pile torque calculations and manufacturers technical documentation; the design must be stamped by a professional engineer when 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 calculations - Part 6 design for HVAC and Mechanical – when each dwelling unit has 6 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:
Permit fees depend on your project. 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 application is 15 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):
