Buying a Waterfront Cottage in Ontario: Legal Checks Before Closing

A cottage on the water feels simple to buy, but the legal picture is often more layered than for a city house. The shoreline, the road in, the septic system and the dock can each have their own rules and their own approval bodies.

This article walks through the main checks to raise with your lawyer before you close. It is general information for Ontario, and the answers depend on the specific property.

Who owns the shoreline?

Most lake and river beds in Ontario are Crown land. Shore lands are the lands below the high-water mark or the maximum regulated contour, whichever is higher.

A strip called a shore road allowance can also sit between a cottage lot and the water. It is one chain (66 feet) wide, was set aside in the 1800s for public roads, and a lot that fronts one does not reach the water's edge unless the allowance has been closed and conveyed to the owner. A Crown shoreline reserve is a similar strip of ungranted Crown land, no more than 30 metres deep, between a water body and private property.

Ask for the survey and the title search, and have your lawyer confirm whether the land you think you are buying actually runs to the water.

Docks, boathouses and work near the water

A Public Lands Act work permit from the Ministry may be needed to build a structure such as a dock or boathouse that touches more than 15 m² of Crown or adjacent shore lands, or to dredge or fill shore lands. Doing that work without a required permit is an offence.

There are exceptions. Structures touching 15 m² or less of shore lands are exempt if they meet the conditions in Ontario Regulation 239/13, a structure floating over shore lands is not treated as touching them, and removing a dock or boathouse without dredging needs no permit.

A separate conservation authority permit is needed for development and some other activities in regulated areas, including floodplains, shorelines, wetlands and watercourses. A conservation authority or municipal permit does not replace a Ministry work permit when one is required. Ask the seller whether existing structures were permitted, because you may inherit the problem.

Buildings, zoning and septic

A municipal building permit is needed to build a new structure over 10 square metres, add to or renovate a building, change its use, or install, alter or repair a septic system. Under the 2024 Building Code, a small shed of no more than 15 m² that is one storey or less, detached, used only for storage accessory to a principal building and has no plumbing needs no permit under section 8 of the Building Code Act, but a cabin does not qualify. Because these thresholds differ, confirm with the municipality before relying on either. Building without a required permit is an offence under the Building Code Act, 1992, with fines of up to $50,000 for an individual on a first offence.

Zoning matters too. If a project needs a zoning change or a minor variance, no permit will be issued until that approval is obtained. In unincorporated areas, permits and inspections are not available, but every building must still comply with the Ontario Building Code.

Septic systems have distance rules. A treatment unit must be at least 15 m from a well and from a lake, river, stream, pond or reservoir, and both treatment units and distribution piping must be at least 3 m from a property line. Every septic installation, repair or upgrade needs a permit and must be inspected. Tanks must be cleaned when sludge and scum fill one-third of the working capacity.

• Ask for permits and final inspection records for additions, decks, docks and the septic system.
• Ask when the septic tank was last pumped and where the well sits relative to the system.
• Ask your lawyer to check zoning for the existing buildings and any plans you have.

Road access and other title issues

Many cottages are reached by a private road. Under the Road Access Act, an access road is a privately owned road that is not a public highway and serves as a motor-vehicle route to one or more parcels, and a landowner generally cannot close it without a court order, apart from limited listed exceptions. Confirm in writing how your access is secured and who maintains it.

Rights of way can sometimes arise through long use. An easement can be acquired by prescription through 20 years of continuous, uninterrupted, open and peaceful use as of right. For Land Titles land, the Land Titles Act bars acquiring rights adverse to the registered owner by prescription, so a prescriptive easement must rest on 20 years of use completed before the land entered Land Titles.

If the driveway meets a provincial highway within MTO Controlled Areas, entrance permits do not pass with title, so a buyer must apply to validate an existing entrance.

Tax points and what to do next

A cottage can be designated as a principal residence. A unit counts as ordinarily inhabited even if you live in it for only a short period in the year, but if the main reason for owning it is to earn income, a short stay will generally not be enough. Where the land is larger than one-half hectare, the excess generally does not qualify unless you show it was needed to use the home as a residence. A family can designate only one home per year, which forces a choice between a city home and a cottage.

If the seller is a non-resident, special rules apply: the seller must notify the CRA within 10 days of the sale, and without a certificate of compliance the buyer may become liable for tax and may withhold 25% (50% for certain property) of the price, less any certificate limit. Tax on new or heavily renovated cottages depends on the facts, so ask an accountant.

• Order a current survey and a title search before you waive conditions.
• Confirm shoreline ownership, any road allowance or shoreline reserve, and the route of legal access.
• Request permits and inspection records for buildings, docks and the septic system.
• Check zoning and conservation authority mapping for your planned use.
• Ask your lawyer and accountant about the principal residence and non-resident rules.

Frequently asked questions