The short answer
In Hamilton, cosmetic work like painting, flooring and replacing cabinets usually doesn't need a building permit. Structural changes, new or moved plumbing, finished basements, secondary suites, new exterior openings, most decks and additions generally do. Electrical work needs a separate ESA permit. Always confirm with the City's Building Division.
Who issues building permits in Hamilton?
The City of Hamilton's Building Division issues building permits for the whole city, including Stoney Creek, Ancaster, Dundas, Glanbrook and Flamborough (Waterdown). Applications are reviewed against the Ontario Building Code and Hamilton's zoning by-law. Burlington and Grimsby are separate municipalities with their own building departments.
Work that usually needs a building permit
- Removing or altering load-bearing walls, beams or other structure
- Finishing a basement where you build walls, add a bathroom or change the layout
- Creating a secondary suite or basement apartment
- Adding a new bathroom, or adding or moving plumbing fixtures and drains
- Cutting new or larger window and door openings in exterior walls
- Additions, garages and most new accessory buildings over 10 m²
- Many decks, especially raised or attached decks
- Installing a wood-burning fireplace or stove
Work that usually doesn't need a building permit
- Painting and wall coverings
- Replacing flooring
- Replacing cabinets and countertops without moving plumbing
- Replacing fixtures such as sinks and toilets in the same location
- Like-for-like repairs that don't change structure
These lists are general guidance. Your specific project, property and zoning can change the answer, so confirm with the City before starting.
Electrical and gas work need their own permits
In Ontario, almost all electrical installation work requires a permit (notification) from the Electrical Safety Authority (ESA), separate from the City's building permit. Work done for hire must be performed by a Licensed Electrical Contractor, who files the permit and arranges the ESA inspection.
Gas appliances and piping must be installed by a contractor registered with the Technical Standards and Safety Authority (TSSA).
How the permit process works
- Prepare drawings showing the existing and proposed work (structural changes may need an engineer).
- Submit the application to the City with drawings and fees.
- The City reviews zoning and Building Code compliance and may ask for changes.
- Once the permit is issued, keep it posted on site.
- Book inspections at required stages — for example framing, plumbing, insulation and final.
Permit review time varies with the size of the project and how busy the City is, so build it into your schedule.
Basement flooding and backwater valves
If your basement has flooded before, ask the City of Hamilton about its Protective Plumbing Program, which has offered grants for backwater valves and related work for eligible homes. Program terms and intake change, so check current details with the City.
What happens if you skip a permit?
Work done without a required permit can lead to orders to stop work or open up finished walls for inspection, and it can cause problems with home insurance claims and when you sell. It's usually cheaper to get the permit up front.
Official sources
Related services
- Basement Renovations in Hamilton
- Bathroom Renovations in Hamilton
- New Construction & Additions in Hamilton
This guide is general information, not legal or engineering advice. Rules change — confirm requirements with your municipality and the relevant authority before starting work.