Do You Need a Permit for a Bunkie in Ontario? Rules Explained

One of the most common questions from first-time bunkie buyers is: do I need a permit?

The answer is: it depends — on your municipality, the size of your bunkie, whether it has a foundation, and whether you’re adding plumbing or electricity. This guide covers Ontario specifically, since that’s where most bunkie buyers are located.

The General Rule in Ontario

Under Ontario’s Building Code, you generally do not need a building permit for an accessory structure (like a bunkie) if it meets all of the following:

Less than 10 square metres (108 sq ft) in floor area
Not attached to another building
No plumbing
Not located in a floodplain or other regulated area

If your bunkie is larger than 108 sq ft — and most are — you will likely need a building permit.

What Happens if Your Bunkie is Over 108 sq ft?

For structures over 108 sq ft, you need to apply for a building permit with your local municipality. Here’s what that typically involves:

Submit drawings — a site plan showing where the bunkie will sit on your property, plus floor plans and elevations
Pay permit fees — typically $300 to $1,500 depending on the municipality
Meet setback requirements — your bunkie must be a certain distance from your property lines, the water (if on a waterfront lot), and other structures
Pass inspections — typically a foundation inspection and a framing inspection

The process sounds intimidating but it’s usually straightforward for a simple bunkie.

Setback Requirements

Setback requirements vary significantly by municipality, but common rules include:

Side and rear yard setbacks — typically 1.2 to 3 metres (4–10 feet) from property lines
Shoreline setbacks — often 15 to 30 metres (50–100 feet) from the high-water mark on waterfront properties
Septic setbacks — if you’re adding a toilet or water, you must be a certain distance from your septic system

Always check with your specific municipality — these numbers vary and the map of where you can build can be complicated.

Cottage Country Municipalities

If your bunkie is at a cottage, the rules are often stricter. Many cottage country municipalities have additional zoning bylaws around:

Shoreline protection — very strict setbacks near the water
Maximum lot coverage — limits on how much of your lot can be covered by buildings
Designation of structures — whether a bunkie counts as a “secondary dwelling” (which triggers more requirements)

Some popular cottage municipalities and their general approach:

Municipality	General Approach
Muskoka	Strict shoreline rules; permits required for most bunkies
Haliburton	Generally permit required over 10 sq m
Prince Edward County	Permit required over 10 sq m; check agricultural zone rules
Kawartha Lakes	Permit required over 10 sq m; zoning varies by area

This table is for general guidance only — always verify with the specific township office.

What About Electricity in a Bunkie?

Adding electricity to a bunkie always requires a permit — specifically an electrical permit from the Electrical Safety Authority (ESA). This is separate from the building permit.

An ESA permit ensures your electrical installation is safe and meets code. The work must be done by a licensed electrician or, in some cases, by the homeowner with an owner-built permit.

Do not skip the electrical permit — it’s a safety issue and can also affect your home insurance.

What About Plumbing in a Bunkie?

Adding plumbing — a toilet, sink, or shower — significantly increases complexity:

You need a building permit (regardless of size)
You need a plumbing permit
If you’re not connected to municipal sewer, you need septic capacity — which may require a septic system expansion or permit

Many bunkie owners skip plumbing entirely and use the cottage’s existing bathroom. This is often the simplest and cheapest approach.

Tips for Navigating Permits

Call your municipality first — most building departments are happy to answer preliminary questions before you apply
Be honest about your plans — trying to sneak a bunkie past the building department rarely ends well; fines and demolition orders are real possibilities
Get everything in writing — if a building inspector tells you that you don’t need a permit, get that in an email
Check your insurance — some home insurance policies require that all structures on your property be built to code; unpermitted buildings can create coverage issues

The Bottom Line

For most standard bunkie sizes (120–200 sq ft), expect to need a building permit in Ontario. The process is manageable, costs a few hundred dollars, and gives you legal peace of mind. Skipping permits can create problems when you sell your property.

When in doubt, call your local building department. They’re not the enemy — they’re there to help you build safely.