How do you prepare a basement underpinning permit application in Toronto?

Basement underpinning permit preparation in Toronto: the application route, document checklist, official City guide and practical next steps.

Permit likely required

Underpinning an existing house foundation requires a building permit.

This is a structural project. The City’s guide describes design, construction stages and engineering reviews. Check adjacent foundations and soil conditions with your design professional.

What changes the answer

Application routeUse the project-specific City guideInfo

Confirm the requirements against the official guide linked below.

Official sourceCity of TorontoBasement underpinning application guide

Verified2026-09-30Open proof

Your preparation checklist

0 of 5 prepared

Preparation checklist for basement underpinning. Reviewed 2026-09-30. Confirm the final submission requirements with the City.

Site plan
Existing and proposed foundation plans
Numbered sequence of underpinning stages
Sections showing the proposed depth
Applicable engineering review forms

Fees and timing

TimelineConfirm the review stream after defining the project.

FeesUse the current City fee schedule for the proposed work.

Next steps

Define the proposed basement depth
Record nearby foundation conditions
Confirm design and inspection requirements with your engineer

Share this project guide

Send the guide to your designer or contractor before agreeing on the scope.

Related project guides

Interior alteration Garage / carport Basement apartment / secondary suite Garden suite