05/15/2026
Structural repairs are not something you want to cut corners on. Permits and engineer inspections are not only important, they are mandatory.
Always hire a professional team, and have a structural engineer asses the structure, before you start any work.
Here is a detailed walk through of the steps needed to start your project. This process cost between $2000-$6000 depending on details.
Replacing a full foundation under an existing structure is one of the most complex, high-risk residential structural projects you can undertake in Ontario. Because you are dealing with structural load-bearing elements, the process is strictly regulated under Part 9 (or Part 4 if engineered) of the Ontario Building Code (OBC).
The entire process moves through a predictable sequence of paperwork, zoning reviews, engineering, and hands-on site inspections to ensure the building doesn't collapse and the final product handles moisture and soil pressures perfectly.
Part 1: The Building Permit Process
In Ontario, building permits are issued by your local municipal building department (not the provincial government). Attempting a foundation replacement without one is a Provincial Offence.
1. Pre-Application & Zoning Review
Before drafting structural details, you must confirm your project complies with the local Comprehensive Zoning By-law.
Setbacks & Footprint: If you are replacing the foundation exactly in its current footprint, you are generally fine. However, if you plan to increase the basement height (pouring taller walls) or alter the footprint, it may affect grading or municipal setbacks.
Conservation Authorities: If the property is near a waterfront, river, wetland, or steep slope, you will likely need a separate permit and clearance from the local Conservation Authority before the municipality will issue a building permit.
2. Engineering & Drawing Requirements
You cannot simply sketch a total foundation replacement on a napkin. Municipalities require detailed architectural and structural plans, usually prepared and stamped by a Licensed Professional Engineer (P.Eng.) or a designer with a BCIN (Building Code Identification Number).
Your application package must include:
Site Plan / Survey: Showing property lines, existing structures, and setbacks.
Shoring & Temporary Support Plans: Crucial for a replacement. The city wants to see exactly how the existing house will be safely cribbed, jacked, and temporarily supported while the old foundation is demolished.
Geotechnical / Soil Report: To determine the soil's bearing capacity (ensuring the new footings are sized correctly for the ground conditions).
Structural Drawings: Detailed blueprints of the new footings, foundation wall thickness, rebar/reinforcement placement, joist/beam connections, and window/door lintels.
Drainage & Waterproofing Plan: Layout of the weeping tile, sump pump, dampproofing, and exterior drainage layer.
3. Submission and Timeline
Applications are increasingly submitted online through municipal portals (like Cloudpermit). Once the permit fees are paid, the building department has a statutory target timeline under the OBC—typically 10 business days for a standard residential project—to either issue the permit or refuse it with a list of required corrections.
Part 2: The Mandatory Inspection Sequence
Once the permit is taped to your window, the real work begins. You cannot just call for an inspection at the very end. The OBC dictates specific stages where work must be inspected before it is buried or covered up. Municipal inspectors are legally required to conduct an inspection within 2 business days of a request.
The sequence for a foundation replacement generally follows these critical checkpoints:
1. Shoring / Temporary Support Inspection
When to call: Once the temporary structural steel beams, cribbing jacks, or engineered shoring systems are completely installed and holding the weight of the house, but before major excavation or demolition of the old foundation begins.
What they check: The inspector ensures the temporary support structure exactly matches the engineer’s stamped shoring plan to guarantee worker safety and structural stability.
2. Ready-to-Pour Footing Inspection
When to call: Excavation is complete, footing forms are built, and rebar/reinforcement is tied, before any concrete is poured.
What they check:
The inspector verifies the footings are sitting on solid, clean, undisturbed, and unfrozen ground.
They ensure the footing depth meets the minimum 1.2-meter frost protection cover required in Ontario.
They measure the width and depth of the forms and verify the rebar placement matches the approved drawings.
3. Foundation Wall / Formwork Inspection (If Concrete)
When to call: If you are pouring concrete walls, this occurs once the wall forms and internal rebar are erected, but before the pour. (If using ICF—Insulated Concrete Forms—they inspect the blocks, bracing, and rebar layout).
What they check: Wall thickness, reinforcement specifications, and window/door buck structural headers.
4. Structural Structural Framing & Tie-In Inspection
When to call: Once the new foundation walls have cured, the house has been lowered onto the new foundation, and the structural connection (sill plates, anchor bolts, joist hangers, and beam bearings) is complete.
What they check: They ensure proper anchorage of the building frame to the new concrete. For instance, verifying that beams have a minimum of 90 mm of solid bearing on the foundation walls.
5. Waterproofing, Drainage, and Backfill Inspection
When to call: Crucial stage. This must be inspected prior to backfilling the excavation.
What they check:
Dampproofing: A clean coat of dampproofing material or an approved exterior drainage membrane wrapper.
Weeping Tiles: Proper placement of the perimeter drainage tile on solid ground, with perforations facing down.
Stone Cover: Verifying the weeping tile is covered by at least 150 mm (6 inches) of clean crushed stone.
Lateral Bracing: Ensuring the foundation walls are laterally supported (either by the first-floor joist system being fully nailed down or via temporary bracing) so the pressure of the backfill doesn't push the new walls inward.
6. Sub-Slab & Plumbing Rough-In (If applicable)
When to call: If you are pouring a new concrete basement slab, this is called after the gravel base, radon/vapour barrier, perimeter insulation, and any under-slab plumbing are laid out, but before the concrete floor is poured.
7. Final Inspection
When to call: Once all exterior grading is sloped away from the new foundation, window wells are installed, and the structural scope of the permit is entirely complete.
What they check: General safety, proper grading to prevent water pooling against the new structure, and ensuring all engineering sign-offs (if third-party engineer reviews were mandated) are filed.
Pro-Tips for a Smooth Process
Keep Drawings On-Site: The inspector is not psychic; they will refuse to do the inspection if a printed copy of the municipally approved permit drawings isn't physically on site.
Do Not Cover Work: If a contractor backfills the foundation before the drainage inspection, the inspector has the legal authority to order you to dig it all back up by hand to prove it was done right.
Field Inspection Reports: Immediately after an inspection, the official will issue a Field Inspection Report. Keep these files clean—when you eventually sell the property, future buyers and home inspectors will ask for proof of the closed permit and successful inspection reports for a major repair like this.
