An inspection is independent verification that the structural, plumbing, mechanical and fire safety work in your home meets the Ontario Building Code, done before that work disappears behind drywall. Timing is the entire point. Once a wall is closed, what sits behind it cannot be assessed without opening it again. There is a second benefit homeowners appreciate later. A renovation that passed every required inspection leaves a documented municipal record that the work was done correctly. That record supports your insurance position, removes friction at resale, and answers the buyer’s lawyer before the question is asked.
| Good to know: The required inspections are covered by your building permit fee. You do not pay per visit, so a contractor has no financial reason to skip one. Re-inspections after a failure may carry an extra fee in some municipalities. |
The Ontario Building Code requires the permit holder to notify the building department when construction reaches each prescribed stage. Which stages apply depends on your scope. These come up most often in residential renovation:
| Inspection | When It Is Called | What Is Checked |
| Framing | After structural framing, before insulation or drywall | Stud spacing, headers, blocking, beams, posts and connections. On load-bearing wall removals, that the beam and posts match the structural drawings. |
| Insulation and vapour barrier | After insulation, before drywall | Insulation levels against Code energy requirements, and vapour and air barriers sealed at every location, including penetrations and rim joists. |
| Plumbing rough-in | After drain, waste, vent and supply rough-in, before walls close or concrete covers below-grade drains | Drain slope, venting and fixture locations under Part 7 of the Building Code. |
| HVAC and mechanical | With framing, once ductwork, HRV or ERV and exhaust are roughed in | Ventilation, exhaust and heating layout against the Code. |
| Fire separation | Legal basement suites and any fire-rated assembly | Type X drywall, fire-stopping at every penetration, and rated doors with self-closers. For a secondary suite, this stands between you and a legal tenant. |
| Final and close-out | At completion | The finished work against the approved drawings, all earlier deficiencies corrected, and the permit closed. |
Your project is not finished until the permit is closed, a distinction many homeowners only discover at resale.
Inspectors are not assessing your taste, your finish quality or whether the tile is level. They check Code compliance and nothing else:
When an inspector finds a deficiency, they list the required corrections. Work on that stage stops, the corrections are made, and the inspection is rebooked. That costs days at minimum, and considerably more if the problem is structural.
The best inspection preparation happens months before an inspector arrives. Confirm these five points in writing before you sign:
Legally, calling in inspections is the permit holder’s responsibility. On a well-managed renovation the contractor holds the permit and handles all scheduling, and that arrangement should be written into your contract.
A failed inspection means a deficiency notice, a correction and a rebooked visit. Under the Building Code, inspections are generally carried out within two business days of the notice, so a failed stage typically costs the better part of a week once the correction work is included. Annoying, but recoverable.
Work closed in without its required inspection may have to be opened so it can be inspected after the fact. Drywall comes off. Concrete gets cut. That cost lands on the homeowner, rarely on the contractor who skipped the step. Failing to notify the building department at a prescribed stage is also an offence under the Building Code Act, not just a procedural lapse.
The version that hurts most arrives at sale time. Uninspected or unpermitted work found during due diligence unsettles buyers and lenders, and commonly produces a price reduction or a condition requiring remediation. If a previous owner did unpermitted work, it can often be resolved through a retroactive permit, though that usually means exposing concealed work. Deal with it before listing, not during a sale, when your negotiating position is weakest.
| The bottom line: The saving from skipping an inspection is always smaller than the eventual cost of having skipped it. |
At Maple Leaf Quality Renos, every required inspection is booked at the correct construction stage, coordinated directly with the municipal building department and the ESA, and passed before any phase of work is closed in. Every project is handed over with complete permit documentation and a closed permit.
Book a free, no-obligation consultation for honest answers about your project before you commit to anyone.
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