Water Damage Between Strata Units: Who's Responsible?

If you own a strata lot in BC, the question of who pays when water damages your unit, or your neighbour's, is the single most common strata dispute we see. The honest answer is that water damage in BC strata units is governed by a layered system: the Strata Property Act, your building's bylaws, the strata's master insurance policy, and your own condo (HO-6) policy all interact. Most owners assume "the strata pays for everything" or "it's always my problem." Both are wrong. Below we walk through how responsibility is actually allocated, how the deductible chargeback works under Strata Property Act s. 158, and what to do in the first 24 hours after water appears.

Why water damage is BC's most common strata dispute

Water damage is consistently among the top categories of strata-property claims in BC by frequency. The reasons are structural: aging building envelopes from the 1990s leaky-condo era, dense in-suite plumbing in newer high-rises, dishwashers and laundry in every unit, and an owner population that increasingly includes renters and short-term-rental guests who don't know where the shutoff valve is.

The Civil Resolution Tribunal, which handles many strata disputes, publishes many water-damage decisions. The patterns are predictable. Owner left a tap running. Dishwasher hose failed at the connection. Toilet supply line burst while owner was on vacation. Hot-water tank ruptured. Each scenario triggers a different liability outcome.

The good news: BC has clearer rules than most provinces. The bad news: most owners and many council members don't know them, which is how a significant deductible chargeback lands on the wrong person.

Negligence vs common-property failure: the core distinction

Two questions decide almost every water-damage case in BC strata law:

1. Where did the water originate? A unit's exclusive plumbing (under-sink lines, dishwasher hose, toilet supply, washing machine connection) is the owner's responsibility. In-wall stack plumbing, the building envelope, the roof, and shared mechanical systems are common property and the strata's responsibility.
2. Was anyone negligent? Did an owner or occupant act, or fail to act, in a way that caused or worsened the damage?

The big trap: even when the failure was a hidden defect inside the unit (a 20-year-old toilet supply line nobody could see), s. 158 still allows the strata to charge the deductible back to the owner whose strata lot was the source. Fault and origin are different concepts in BC strata law, and origin is what triggers the chargeback.

How the s. 158 deductible chargeback actually works

This is the mechanism that surprises owners most. Here's the sequence:

1. Water originates in or escapes from your strata lot.
2. Damage spreads to other units or common property.
3. The strata files a claim against the corporation's master insurance policy.
4. The insurer pays out the damage minus the strata's deductible (often a significant five- or six-figure amount post-2020).
5. The strata, using s. 158(2)(c), charges that deductible to you as a debt to the corporation.
6. If you don't pay, the strata can lien your strata lot.

You do not have to be negligent for this to happen. BC case law has confirmed that s. 158 chargebacks can flow from the lot of origin without proof of fault, and the Civil Resolution Tribunal has applied that approach consistently. CRT decisions have upheld significant chargebacks against owners whose ageing fridge or dishwasher water lines failed while they were at work. Confirm current case law before relying on any specific decision.

The chargeback is not a fine and does not require a hearing or bylaw notice. It's a statutory debt. But the strata still has to prove the strata lot was the origin, and the owner has the right to dispute that finding at the CRT.

Your own condo policy: the missing piece

Most BC condo owners hold an HO-6 (condo) policy. The basic policy covers your contents, your upgrades, and personal liability. To handle a s. 158 chargeback, you need three specific add-ons:

Strata deductibles climbed sharply during and after the 2020 BC strata insurance crisis, and many owners still hold policies sized for the old low-deductible era. If your building's water deductible has climbed significantly and your policy maxes out below that, the gap lands on you personally. We've seen this exact scenario at a Sea-to-Sky council table: a retired owner facing a five-figure shortfall on a leak she couldn't have prevented.

What to do in the first 24 hours after water appears

The decisions you make in the first day shape everything that follows.

• Stop the source. Find the shutoff. If you can't, call the strata's 24/7 emergency line.
• Photograph everything. Walls, floors, ceilings, contents. Before any cleanup.
• Call the strata first. Even if the water seems contained to your unit, they need to know in case neighbours are affected and to start the insurance process.
• Notify your own insurer within 24 hours. Don't wait to see who's responsible. Delayed notification can void coverage.
• Keep damaged items. Don't toss the cracked dishwasher hose or the burst supply line, they're evidence.
• Document every call. Date, time, name, what was said. A written log is your best protection in a CRT dispute.
• Don't sign anything. Some restoration companies push owners to sign work authorizations on the spot. Let the strata's insurer scope the work first.

For deeper coverage on the claims process itself, see our strata insurance claim walkthrough.

Common scenarios and how they typically resolve

A few real-world patterns:

• Owner overflows tub. Owner pays the strata deductible. Owner's HO-6 loss-assessment coverage reimburses owner if the policy is sized correctly.
• Dishwasher hose fails while owner is at work. Owner is the origin even though they did nothing wrong that morning. Deductible charges back. HO-6 should respond.
• In-wall stack pipe bursts. Strata pays the deductible. No chargeback to any owner. The strata's claim experience may push up next year's premium for everyone.
• Building envelope leak during atmospheric river. Strata pays the deductible. If multiple units are damaged, the strata's claim might be capped by sub-limits. Check the policy.
• Hot-water tank in a unit fails. Owner is the origin. Deductible charges back. Many BC condo carriers now require annual or biennial hot-water tank replacement after 10 years to maintain coverage.
• Tenant causes the damage. Owner is still the origin. Owner pays, then pursues the tenant separately under the residential tenancy agreement.

For neighbour-to-neighbour water disputes that don't go through insurance (small drips, repeated minor leaks), see our guide to the CRT strata dispute process.

How councils should respond to water claims

If you sit on a strata council, your job after a water event is sequential: secure the source, mitigate further damage, document the origin, file the claim, and only then start the chargeback conversation. Skipping the origin investigation is the most common council error we see, and it's the fastest way to lose at the CRT. Section 158 gives you a powerful tool, but only if you use it properly.

If your council is dealing with an active water claim and you want a second set of eyes on the chargeback process before invoicing an owner, reach out to us. We've walked dozens of councils through this and we'll tell you straight if your position is solid or if you need to keep digging on the source.