Understanding what building inspectors look for — and when they look — prevents the costly mistake of covering up work before inspection.
The Inspection Sequence for a Typical Renovation
Not all inspections happen at the same time. Different stages of work require specific inspections, and the sequence matters:
1. Pre-construction/Site meeting (some municipalities): For complex additions, inspectors may require a site meeting before work begins to review plans.
2. Foundation/Footing inspection: Before pouring concrete for any new foundation work. Inspector verifies: footing size, depth, bearing on undisturbed soil, reinforcement if required.
3. Framing/Rough-in inspection: After framing, rough-in plumbing, rough-in electrical, HVAC rough-in, and insulation — but BEFORE drywall. This is the most comprehensive inspection and must pass before any covering.
What inspectors check at rough-in:
- Framing connections and fire blocking
- Plumbing: proper pipe sizing, slope, venting
- Electrical: conductor sizing, box fill, rough-in placement
- Insulation coverage and vapour barrier
- Window and door installation (if applicable)
4. HVAC inspection: Ductwork and mechanical equipment before concealment.
5. Electrical ESA inspection: Separate from building inspection — ESA inspector reviews electrical rough-in. Both inspections (ESA + building) must be passed.
6. Insulation inspection: In some municipalities, a specific inspection for insulation before drywall is required.
7. Final inspection: After all work is complete. Inspects: all installed systems operational, fire separation complete, guards and railings at required heights, smoke and CO alarms installed, drainage working.
Common Inspection Failures
Framing: Missing fire blocking in wall cavities at floor levels, improper joist hangers, missing squash blocks.
Plumbing: Insufficient drain slope, improper vent sizing, missing cleanouts.
Electrical: Improper box fill calculations, missing GFCIs, aluminum/copper connections without approved connectors.
Insulation: Compressed batts, incomplete coverage, vapour barrier on wrong side.
The Inspector Is Not Your Enemy
A failed inspection is not a catastrophe — it’s a correction. Fix the deficiency, schedule reinspection. Inspectors are a quality check that protects your investment.
Inspection experiences — positive and frustrating — are shared at home.renovation.reviews.
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