What is it?
An encroachment is when part of a building or structure crosses the property line and sits on someone else’s land. Fences, sheds, the corner of a garage, roof eaves, decks, driveway paving, air-conditioner units and steps are common examples.
It goes both ways. Your structure may be over the neighbour’s line, or the neighbour’s structure may be on your land. Front steps or a wall that extend onto the city’s road allowance are encroachments too.
Even a few centimetres count. It may cause no trouble today, but it surfaces as a dispute when you sell, build a new fence or add on to the house.
How do you find out?
- A survey (SRPR): a licensed Ontario Land Surveyor measures the boundaries and the position of structures and draws them. Anything over the line is shown on the plan and in the report. The surveyors’ association (AOLS) says only a surveyor holding a Certificate of Authorization may do legal boundary surveys.
- Limits of an old survey: a fence, shed or deck built after the survey is not on it. If the seller’s survey is old, it may not match what is there now.
- A fence is not the boundary: fences are often put where it was convenient, not on the line. The boundary is fixed by the surveyor’s markers in the ground (iron bars) and the registered plans.
- The neighbour’s new survey: encroachments often come to light when the house next door is sold or the neighbour surveys before building a fence.
- The title search: if earlier owners registered an encroachment agreement or an easement, it turns up in your lawyer’s title search.
Does long use make it mine?
No. Section 51 of Ontario’s Land Titles Act says that no one can gain an interest against the registered owner of Land Titles land by any length of possession. If your home is registered under Land Titles (your lawyer confirms this from the parcel register), a neighbour who has used a strip of your yard for decades does not own it.
There is an exception. Section 44 of the same Act says registered land remains subject to any title the adjoining owner has already acquired by possession or improvements. Section 44 does not say when such a right must have arisen, but because of section 51 it is usually one that arose before the land moved into Land Titles, under the old Registry system. An old fence line or driveway may carry such a right, so your lawyer should check the type of title (for example a converted title) and its history.
How it is resolved
| Option | How | When it fits |
|---|---|---|
| Leave it and register an agreement | Sign an encroachment agreement with the neighbour and register it, usually with a condition such as removal when the structure reaches the end of its life | Eaves or an old garage that are hard to move and cause little harm |
| Grant an easement | Register a permanent easement over the encroached strip. Municipal consent may be needed | A driveway or steps that must stay in use |
| Remove or move it | Move the fence to the line or take the shed down | When moving is cheap and you want the dispute over |
| Sell a sliver of land (boundary adjustment) | Buy or sell the encroached piece and change the boundary. Needs municipal consent under section 50 of the Planning Act | A large encroachment where both sides agree |
| Court | Ask for an order to remove it or for damages if no agreement is possible | The last resort. Costly and slow |
Whichever route you take, the document must be registered to bind the next owner. A verbal deal ends when the neighbour changes.
What about fences?
Ontario’s Line Fences Act says an owner may build and maintain a fence to mark the boundary (section 3). Where the Act applies, an owner in a dispute over sharing the work or cost can apply to the municipal clerk to have fence-viewers decide each side’s share (section 4 (1)).
Toronto is different. The City says the Line Fences Act (except section 20, about former railway lands) does not apply in Toronto and that the City has no role in disputes about the location or cost of boundary fences. Fence height, materials and construction are set by the City’s Fence Bylaw, and for neighbour disputes the City points to free community mediation through TNG Community Services.
Outside Toronto (Markham, Vaughan, Richmond Hill, Mississauga and so on), ask the city whether it runs the Line Fences Act process and what its own fence by-law says.
Does title insurance help?
An owner’s title insurance policy often covers loss from an encroachment that existed when you bought but that you did not know about. This is why many lawyers suggest title insurance instead of a new survey.
There are limits. The policy does not tell you where the boundary is, it does not cover a structure you build after buying, and problems you already knew about may be excluded. Check the exact coverage and exclusions in your policy and ask your lawyer.
Example
Two years after buying a detached house in Vaughan, the neighbour sells and gets a new survey. It shows one side of your back deck crosses the lot line by about 30 cm onto their land. The previous owner built the deck, and the survey you received when you bought was made before the deck existed.
The neighbour worries that their buyer’s lawyer will object. Through lawyers, the two homes sign and register an encroachment agreement saying that when the deck is rebuilt it will be kept inside the line. You also notify the title insurer you bought a policy from at closing and ask whether part of the legal cost is covered.
What to watch out for when buying
- Ask the seller for any existing survey and compare it with the actual fence, shed and deck positions. Tell your lawyer about anything that differs.
- The standard contract usually does not require the seller to provide a new survey. If you plan a fence or an addition, consider making a new survey a condition or ordering one yourself.
- If the title search shows an encroachment agreement, an easement or an encroachment agreement with the city, read the document to learn its conditions.
- If front steps or a wall extend onto the city’s road allowance, a permit or agreement may be needed depending on the city. In Toronto, check with 311 or the responsible division.
- Settling while you are on good terms with the neighbour is cheapest. A dispute that grows can end in court and puts off buyers when you sell.
What the law and official sources say
Quotes are copied word for word. The "In plain words" lines are our explanation, not an official translation.
Despite any provision of this Act, the Real Property Limitations Act or any other Act, no title to and no right or interest in land registered under this Act that is adverse to or in derogation of the title of the registered owner shall be acquired hereafter or be deemed to have been acquired heretofore by any length of possession or by prescription.In plain wordsOn land registered under the Land Titles system, no one gains ownership or a right against the registered owner just by possessing or using the land for a long time.
Source: ontario.ca/laws/statute/90l05 · checked Oct 30, 2026
All registered land, unless the contrary is expressed on the register, is subject to such of the following liabilities, rights and interests as for the time being may be subsisting in reference thereto, … 3. Any title or lien that, by possession or improvements, the owner or person interested in any adjoining land has acquired to or in respect of the land.In plain wordsUnless the register says otherwise, registered land stays subject to any right an adjoining owner already acquired by possession or improvements. This is why your lawyer checks the history of an old fence line or driveway.
Source: ontario.ca/laws/statute/90l05 · checked Oct 30, 2026
An owner of land may construct, maintain and keep up a fence to mark the boundary between the owner’s land and adjoining lands.In plain wordsA landowner may build and keep up a fence that marks the boundary with the neighbouring land.
Source: ontario.ca/laws/statute/90l17 · checked Oct 30, 2026
If the owner of any land wishes to have a fence that marks the boundary between their land and the land of an adjoining owner constructed, repaired or reconstructed, the owner of the land may, using the prescribed form, notify the clerk of the local municipality in which the land is situated that the owner wishes fence-viewers to view and arbitrate what portion of the fence each owner shall construct, reconstruct or repair and maintain and keep up.In plain wordsIn municipalities where the Act applies, an owner who wants a boundary fence built or repaired can ask the municipal clerk to have fence-viewers decide each owner’s share.
Source: ontario.ca/laws/statute/90l17 · checked Oct 30, 2026
The City does not have a role in resolving disputes about the location or costs of boundary fences between properties. … The Line Fences Act, except for section 20 (lands formerly used as part of a line of railway) does not apply in Toronto.In plain wordsThe City of Toronto does not get involved in disputes over where a boundary fence sits or who pays, and the Line Fences Act (except its railway-lands section) does not apply in Toronto. You settle it with the neighbour, through mediation or with legal advice.
Source: toronto.ca/services-payments/building-construction/apply-for-a-building-permit/fences/ · checked Oct 30, 2026
Only holders of a valid Certificate of Authorization (C of A), issued by the Registrar of the Association of Ontario Land Surveyors may offer cadastral (legal boundary) surveying services to the public.In plain wordsOnly a surveyor holding a Certificate of Authorization from the Association of Ontario Land Surveyors may offer legal boundary surveys. To confirm an encroachment, hire one of them.
Source: aols.org/public-protection · checked Oct 30, 2026
Common questions
The neighbour’s fence is inside my lot. Whose land is that strip?
The registered boundary governs, so it is still yours. Land under the Land Titles system does not become someone else’s through long use. Rights from the old Registry days can survive, though, so check the survey and title history with your lawyer before you talk to the neighbour.
Can I still sell a home with an encroachment?
Yes, but the buyer’s lawyer may raise it. Check the survey ahead of time, and for a small encroachment register an agreement with the neighbour so the deal goes smoothly. Often the buyer’s title insurance lets the sale proceed.
Do I have to split a fence cost with my neighbour?
No law forces an equal split. In municipalities where the Line Fences Act applies, fence-viewers can set each owner’s share, but the Act does not apply in Toronto and the City stays out of it. Agreeing with the neighbour is the usual way; otherwise seek mediation or legal advice.
Is title insurance enough without a survey?
Many lawyers suggest exactly that. The policy usually covers loss from an encroachment you did not know about, but it does not tell you where the boundary is. If you plan a fence or an addition, you need a survey. Check the coverage in your policy.
What if my eaves or steps extend onto city land?
That is an encroachment on the road allowance, and the city may require a permit or an encroachment agreement. Procedures differ by city, so ask 311 in Toronto or your own city, and talk to your lawyer.
Guides that use this term
Sources checked
- Land Titles Act, R.S.O. 1990, c. L.5, ss. 44, 51 (e-Laws) · checked Oct 30, 2026
- Line Fences Act, R.S.O. 1990, c. L.17 (e-Laws) · checked Oct 30, 2026
- City of Toronto, Fences (Fence Bylaw, boundary disputes) · checked Oct 30, 2026
- Association of Ontario Land Surveyors, Public Protection · checked Oct 30, 2026
- Planning Act, R.S.O. 1990, c. P.13, s. 50 (consent for boundary changes) · checked Oct 30, 2026