“Do I really need a permit for this?” It is one of the most common questions we hear — and one of the most important to get right. Unpermitted work can void insurance, derail a home sale, and in the worst cases require finished work to be torn open for inspection. Here is a practical guide to how building permits actually work for renovations in Ontario.
When you need a permit
Under the Ontario Building Code, a building permit is required for most work that affects structure, safety systems, or building services. For renovations, that typically includes:
- Removing or altering load-bearing walls, or adding beams and new structural openings
- Additions of any kind — ground-floor, second-storey, or third-storey
- New or enlarged windows and doors where the opening changes
- Underpinning or lowering a basement, and creating a second unit (basement apartment)
- Most plumbing and drain work, and HVAC changes like new ductwork or a new furnace location
- Decks above a certain height and attached structures
- Changing a building’s use — for example, converting commercial space
When you generally don’t
Purely cosmetic work normally requires no permit: painting, flooring, cabinetry, trim, tiling, replacing fixtures in the same location, or re-shingling a roof with the same materials. Fences (outside of pool enclosures) and small detached sheds under the size threshold are also typically exempt.
The grey zone is bigger than most people think, though. “Just opening up the kitchen” almost always involves a structural wall. “Just finishing the basement” usually involves new plumbing, new circuits, and fire-separation requirements. When in doubt, ask — a good builder will tell you honestly, because we are the ones legally and professionally on the hook for building to code.
What the process actually looks like
- Drawings. Permit applications need scaled drawings showing existing and proposed conditions, with structural details designed or reviewed by a qualified professional.
- Application. Filed with your municipality along with fees. Complete applications for straightforward projects are often reviewed within a couple of weeks; incomplete ones bounce back and restart the clock.
- Permit issued — then inspections. The permit is not the end; it is the beginning of a series of municipal inspections at defined stages: footings, framing, insulation, plumbing rough-in, and final. Work cannot be covered up until its inspection passes.
What skipping a permit really costs
The uncomfortable truths about unpermitted renovation work:
- Insurance risk. If unpermitted work is implicated in a claim — say, a fire traced to wiring — your insurer may deny coverage.
- Resale risk. Buyers’ lawyers and home inspectors increasingly ask for permit history. Unpermitted structural work becomes a negotiating lever against you, or a deal-breaker.
- Stop-work orders. A neighbour’s complaint can bring an inspector, a stop-work order, and a requirement to expose finished work for inspection.
- Safety. The code is not bureaucracy for its own sake — it is a century of lessons about what fails and what kills. Fire separations, egress windows, and guard heights all exist for reasons.
How a good builder makes permits painless
At Lusso, permits are simply part of the service: we produce the drawings, file the applications, schedule the inspections, and stand in front of the inspector — for every project, without being asked. When you are comparing builders and one quote is strangely lower, ask directly: “Does this include design, permits, and all inspections?” The answer tells you a great deal about how the rest of the project will run.
A renovation done with permits is worth more, insures cleanly, sells smoothly, and — most importantly — is built to keep your family safe.
Planning a major renovation? Talk to us — we’ll tell you exactly what your project needs, and handle all of it.