What Inspections Are Required During a Renovation?
Date Published
Inspections are the checkpoints that confirm hidden work complies with the Ontario Building Code before it is covered by drywall, flooring, or insulation. Skipping or failing inspections leads to costly rework and legal risk. Homeowners should know which holds apply to their scope, who books them, and what must be visible when the inspector arrives.
Building and Structural Inspections
Structural inspections occur before concealing framing—after beams, lintels, joists, and shear walls are installed per approved drawings. Examiners verify member sizes, connectors, fire separation, and stair framing. Foundation and footing inspections precede pours on additions. Never close walls until framing inspection passes if it is listed on your permit card.
Plumbing Rough-In
Plumbing inspections review drain slopes, venting, water supply sizing, and approved materials before walls close. Adding a bathroom, moving a kitchen sink, or roughing in a basement suite triggers this hold. Inspectors look for test plugs, proper trapping, and protection of penetrations through fire-rated assemblies.
HVAC and Mechanical Rough-In
Mechanical inspections cover furnace replacement, duct routing, ventilation rates for habitable rooms, and makeup air for exhaust systems. Kitchen range hoods, HRV units, and gas appliance venting are common review points. Energy retrofits that alter building envelope performance may need additional documentation.
Electrical Rough-In and Service
Electrical safety authority inspections—separate from municipal building inspectors in Ontario—review panel upgrades, new circuits, outlet spacing, GFCI and AFCI protection, smoke and carbon monoxide device placement, and bonding. Rough-in occurs before insulation and drywall where wiring is visible. Service upgrades may need utility coordination and additional clearances.
Insulation and Vapour Barrier
Insulation inspections confirm R-values, continuous vapour barrier strategy, and air sealing at penetrations before drywall installation. Basement renovations and exterior wall upgrades frequently require this hold. Missing insulation inspection is a common reason inspectors order drywall removal.
Final Building Inspection
Final inspections verify completed construction matches the permit—handrails, guard heights, fire separation, egress windows, plumbing fixtures, and general life safety. Outstanding minor items may generate deficiency lists to close before permit closure. Only after final approval should you consider the project fully compliant for occupancy and resale disclosure.
Who Schedules and What to Keep on Site
The permit holder or contractor typically books inspections with required notice. Keep the permit card, approved drawings, revision log, and prior inspection reports on site. Failed inspections need corrective action and rebooking before concealment. Supervised construction tracks each hold on a shared schedule so trades do not race ahead and bury problems.
Practical Takeaway
Match your inspection plan to the permit card—not to memory. Each rough-in is a quality gate that protects you from invisible defects. Treat passed inspections as documented proof for insurance, resale, and peace of mind.