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Basement Renovation Permits in Ontario: What You Need to Know

Finishing your basement? Here's when you need a permit and when you don't, plus tips for a smooth approval process.

PermitEasy Team2026-02-107 min read

In This Article

Overview

Basement renovations are one of the most common home improvement projects in Ontario. Understanding when you need a permit can save you time, money, and legal headaches.

When Is a Permit Needed?

You WILL need a building permit if your basement renovation includes:

  • New bedrooms - Egress window requirements
  • New bathrooms - Plumbing and drainage
  • Structural changes - Moving walls, adding beams
  • HVAC modifications - New ductwork or furnace relocation
  • Electrical work - New circuits, panel upgrades (ESA permit)
  • Gas line work - Fireplace, stove connections

No Permit Required

You typically don't need a permit for:

  • Cosmetic updates - Paint, flooring, trim
  • Drywall - If no structural changes
  • Cabinet installation - If no plumbing/electrical changes
  • Light fixture swaps - Same location, same type

Second Suite Requirements

Creating a secondary suite (basement apartment) requires:

  • Building permit
  • Fire separation between units
  • Separate entrance
  • Adequate ceiling height (1.95m minimum)
  • Proper egress windows
  • Smoke and CO detectors
  • Zoning compliance verification

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Disclaimer

This article is for informational purposes only and does not constitute legal advice. Building codes and requirements change frequently. Always verify current requirements with your local building department before starting any construction work.