Dock, boathouse and shoreline permits in Ontario

Docks and boathouses sit at the meeting point of your lot, the shoreline and the lakebed, and each of those can belong to a different level of government. Here is who does what.

Who approves what

Your township

Zoning by-laws often set limits on dock and boathouse size, height, setbacks and use. Many cottage townships require a building permit for boathouses, and some for docks too. The Township of Muskoka Lakes, for example, publishes its own guide to building permit requirements for docks. Call the building department before you design anything.

The province and the lakebed

In Ontario, the beds of most lakes and rivers are Crown land. Rules for building on them have shifted since a 2015 court case. Municipal guidance from 2021 says docks and single-storey boathouses with 15 m² or less in physical contact with the lakebed are no longer reviewed by the ministry, while larger cribs and some shoreline work still need a work permit. Boathouses with living space, bathrooms or saunas, and two-storey boathouses, still need provincial authority, which carries a fee. Confirm the current rules with the local district office.

Fisheries and Oceans Canada

Fisheries and Oceans Canada (DFO) looks at whether work could harm fish or fish habitat. Its Projects Near Water website helps you decide whether your project needs a review. Many small, low-risk dock projects can go ahead without DFO approval if they meet its conditions. Shoreline hardening, dredging and infilling get more scrutiny.

Parks Canada: Trent-Severn and Rideau

If your cottage is on the Trent-Severn Waterway or the Rideau Canal, Parks Canada is in charge of the water. On the Trent-Severn, all work on, under and over the bed and waters requires a Parks Canada permit, including docks, boathouses and boatlifts, whether temporary, seasonal or permanent. The Rideau has its own policies for waterfront owners. Parks Canada also tells applicants to check with the municipality and conservation authority.

Talk to Jeff and Emily

Buying a cottage with a big boathouse or a new dock? We will flag what your lawyer and lender will ask about before you firm up.

Or call or text 416-628-9682

Book a call

Conservation authorities and timing

In parts of Ontario, a conservation authority regulates shorelines, wetlands and floodplains, and may need to approve work near the water. Not every cottage lake falls inside one, so ask your township who covers your area.

In-water work often has timing windows to protect spawning fish, and approvals can take weeks or months. If you plan a new dock or shoreline project after closing, start the paperwork in the off season so the work can happen in summer.

Why permits matter when you buy

• Value. An appraiser may give little or no value to a structure without permits, especially a boathouse with living space.
• Insurance. Insurers ask about boathouses, saunas and living space. Unpermitted structures can complicate coverage.
• Title. If the dock or boathouse sits on the lakebed or an open shore road allowance, you may not own what you think you are buying.
• Orders. You inherit any open order to fix or remove a structure.
• Rentals. Some short-term rental licences look at structures used for sleeping.

What to ask for before you buy

1. Building permits and final inspections for the boathouse and any large dock.
2. Any provincial, DFO or Parks Canada approvals for shoreline work.
3. Whether the boathouse has living space, plumbing or a sauna, and approvals for each.
4. A survey showing where structures sit relative to the lot line and the water.
5. A lawyer's title search for work orders and encroachments.

Paying for a new dock or boathouse

Docks are usually paid for with savings or a HELOC. A large boathouse project can sometimes be folded into a renovation mortgage or a refinance, once permits are in hand. Lenders will not fund work that does not have them. See what your equity could cover with our home equity calculator.