What happens if my bathroom renovation damages a neighbour's unit in a Vancouver strata building?

If your bathroom renovation causes damage to a neighbouring unit in a Vancouver strata building, you are almost certainly liable for all repair costs — and depending on the circumstances, your strata corporation's insurance deductible could also land on you. This is one of the most financially risky aspects of condo bathroom renovations in Metro Vancouver, and understanding the liability chain before work begins is critical.

Under the BC Strata Property Act, owners are generally responsible for the maintenance and repair of their individual strata lot, and that responsibility extends to damage caused by work performed within their unit. If your contractor accidentally damages a shared plumbing stack, cracks a drain line, or causes a water leak that seeps into the unit below, you bear responsibility for the resulting damage — not the strata corporation. This can include drywall repair, mould remediation, flooring replacement, and even temporary accommodation costs for displaced neighbours.

Water damage is by far the most common problem. In Metro Vancouver's humid climate, even a small leak from a poorly connected drain or inadequate waterproofing can cause serious damage before anyone notices. Water travels along pipes and through concrete — the damage often appears in a unit that is not directly below yours, making diagnosis and repair more complicated. Mould can establish within 48 to 72 hours in Vancouver's ambient humidity, turning a minor leak into a major remediation project costing $5,000 to $20,000 or more.

The Insurance Deductible Problem

Many Metro Vancouver strata corporations have shifted to water damage deductible bylaws that assign the strata's insurance deductible to the owner whose unit is the source of the water damage. Strata insurance deductibles in BC have risen dramatically in recent years — $25,000 to $100,000 or more is now common for water damage claims. If your renovation causes a leak and the strata files an insurance claim, you could be responsible for that entire deductible on top of any uninsured damages. This is why your own strata unit owner's insurance (HO-6 policy) is absolutely essential, and you should confirm your policy covers renovation-related damage before work begins.

Protecting Yourself

Require your contractor to carry adequate liability insurance — most strata corporations mandate a minimum of $2 million in commercial general liability, and many now require $5 million. Get a certificate of insurance naming the strata corporation as an additional insured. Verify the contractor's WorkSafeBC coverage with a clearance letter. If your contractor does not carry proper insurance and causes damage, you have no recourse through their policy and must cover everything yourself or through your own insurance.

Document everything before work begins. Request a pre-renovation inspection of neighbouring units — photograph existing conditions in the units below, beside, and above yours. Many strata corporations now require this as part of the renovation approval process. This documentation protects you from claims that pre-existing damage was caused by your renovation.

Waterproofing is your best protection. Insist on a proper waterproofing membrane system (Schluter Kerdi or equivalent liquid-applied membrane) for all shower and tub areas, with documented installation including photographs. A properly waterproofed shower installed by an experienced contractor virtually eliminates the risk of water damage to neighbouring units. The cost of professional waterproofing — $1,500 to $4,000 for a standard shower — is trivial compared to a single water damage claim.

Finally, confirm your strata's specific bylaws regarding renovation liability and insurance requirements before signing any contractor agreements. Every strata corporation in Metro Vancouver has slightly different rules, and understanding yours upfront prevents expensive surprises.