Neighbour's New Build Damaged My Foundation in Ontario

Excavation, piling or new construction next door can be followed by new cracks, sticking doors or a shifting foundation at your home. It is stressful, and it is hard to know who is responsible, especially when the building work is still going on.

This article walks through how to protect your evidence, what surveys and local records can show, and the Ontario boundary and tree rules that sometimes come into these disputes. Who is legally responsible depends on the facts, and a lawyer can confirm your position.

First steps when you notice damage

Act early. Damage can get worse, and repairs or weather can erase the best evidence. Take the steps below before anything is changed.

• Photograph and measure cracks, with a ruler in the picture and the date noted.
• Record when you first saw each problem and what work was happening next door that week.
• Keep earlier photos, inspection reports, renovation records and appraisals that show your home's condition before the work.
• Write down the names of the builder, the owner and any engineer or surveyor you can identify.
• Tell your home insurer promptly and ask what your policy covers and what notice it requires.

If you think the damage is serious or the house may be unsafe, get a qualified engineer to look at it. An independent report is often the foundation of any later claim.

Pre-construction surveys and what they show

A pre-construction condition survey is a record of a building's state before nearby work starts, usually with photos and notes on existing cracks. If your neighbour or their builder offered one, or if you arranged one yourself, it gives you something to compare with the damage you see now.

If none was done, do not assume you have no case. Older photos, your own inspection reports and an engineer's opinion about the cause and timing may still help. How much weight each carries depends on the facts.

Local rules and records

Municipalities may pass by-laws about structures, so permits, inspection records and by-law requirements for the neighbouring project are worth asking about. Contact your municipality to find out what permits were issued and how to make a complaint. Those records can help show what work was approved and when it took place.

Whether a by-law breach, if there was one, helps a civil claim for damage depends on the facts and the type of claim, and is worth discussing with a lawyer.

When the work touches the boundary

Construction sometimes raises boundary questions: did the excavation or the new structure cross onto your land? The Line Fences Act process does not decide where the property line is, and the Ontario government says owners must settle boundary disputes themselves, often with legal advice and a survey.

Establishing a boundary through plans and documents is cadastral surveying, which requires a licence under the Surveyors Act, although unlicensed individuals may work under the direction and supervision of a licensed member. If the boundary's location is in doubt, an owner may apply to the Director of Titles to confirm it under the Boundaries Act, with an up-to-date signed plan of survey and the field notes. Once a boundary is confirmed and certified, it is deemed to be the true boundary despite any other Act.

Other boundary features can be affected too. A tree growing on the boundary is the common property of both owners, and injuring or destroying it without their consent is an offence under the Forestry Act. A person convicted under that Act faces a fine of up to $20,000, up to three months in prison, or both. If a tree falls on a line fence, the owner or occupant of the land where the tree stood must immediately remove it and repair the fence.

What to do next

• Keep your evidence organized: photos, reports, dates, emails and insurer correspondence.
• Put your concerns to the builder and the property owner in writing, and keep copies.
• Do not repair or alter damaged areas until they have been documented, unless safety requires it.
• Ask your municipality about permits and inspections for the neighbouring work.
• Speak with a lawyer early. Time limits can apply to claims, and a lawyer can confirm which ones fit your situation.

Frequently asked questions