Sorting Out Whose Fault It Is on a Shared Property

Why this matters

On a condo, a duplex, an HOA, or any property with common and private areas, finding the fault is only half the problem. The other half is whose it is: whose equipment failed, who has authority to approve the repair, and who owes the bill. Get the diagnosis right and the ownership wrong and you have done good work for a person who will not pay, or a repair someone else had the sole right to authorize. This is not about tracing the fault physically. It is about mapping the fault onto a boundary of responsibility that is invisible in the equipment but decisive for who you talk to and who you invoice.

Common versus exclusive, the line that matters

Shared properties draw a line between what everyone shares and what belongs to one owner or tenant. The names differ, common elements and limited common elements in a condo, common area in an HOA, shared versus demised space in a lease, but the shape is the same: some equipment serves the whole property and is the association's or owner's responsibility, and some serves one unit exclusively and is that occupant's. The failed component sits on one side of that line. Which side decides everything downstream about authorization and billing, so establish it before you propose a repair.

Find the demarcation point for your trade

Every trade has a physical point where shared responsibility hands off to private. It is where "the building's" becomes "the unit's," and it is where the responsibility usually splits.

• Plumbing: typically the unit's isolation valve or the point where a branch leaves the shared riser or main; the riser is commonly shared, the fixtures and the branch past the valve commonly private, though a specific declaration or lease can move that line.
• Electrical: commonly the unit's own panel or meter; the service and feeders are commonly shared, the branch circuits past the unit panel private, again subject to how the property is actually declared.
• HVAC: a unit's own air handler and refrigerant lines are commonly private; a shared boiler, chiller, cooling tower, or common loop is commonly the association's.
• Appliance: almost always private to the occupant, unless the property furnishes it, in which case the owner carries it.
• Pool and grounds: commonly a shared amenity under the association, so the pad equipment is usually common regardless of which unit's window overlooks it.

Treat these as the usual split, not a rule, because the property's own governing documents or lease can and do reassign the boundary. When money turns on it, the documents decide, not the convention.

Read the documents when the boundary is contested

If the failed component sits right on the line, or the parties disagree, the answer is in the paperwork, the condo declaration, the HOA rules, the lease, not in your read of what seems fair. You are not the arbiter of the boundary; you are the person who diagnoses the fault and reports honestly which side of the stated line it falls on. Say what you found and where it sits, and let the owner, association, or manager reconcile it against their documents. Guessing the ownership to be helpful is how you end up in the middle of a dispute you had no stake in.

Separate the fault from the blame

Whose equipment failed and whose behavior caused it are two different questions, and shared properties conflate them constantly. A shared drain backing up because one unit put grease down it is a shared component with a private cause. A private fixture failing from a building-wide water quality issue is a private component with a shared cause. Report both cleanly, what failed and what appears to have caused it, with evidence, and resist being pulled into assigning blame between neighbors. Your credibility on a shared property depends on being the one who reports facts, not the one who takes a side.

Confirm who authorizes before you turn a wrench

The person standing in front of you is often not the person who can approve the repair or pay for it. A tenant cannot authorize work on a shared component; an owner cannot authorize work on the association's equipment; a resident manager may have limited spending authority. Confirm you are talking to whoever actually controls the affected component before you commit labor or parts, and get the authorization from them, not from whoever happened to open the door. The diagnosis is yours to make; the decision to repair belongs to whoever owns the boundary the fault fell on.

References

• Trade-standard practice on service demarcation between common and private systems
• General guidance on condominium declarations, HOA governing documents, and lease responsibility clauses
• See related: The Tenant Reports It but the Landlord Pays (decision tree); Tracing a Fault Across a Shared System