Water Damage in a Triple-Decker or Condo: Whose Insurance Pays When the Leak Came From Upstairs

Half the water damage calls we get in Dorchester, South Boston, and Somerville start the same way: the unit above had a leak, and now your ceiling is on the floor. Here is how responsibility actually works, and what to do in the first hour.

The short version

In most Massachusetts condo and multi-family situations, each owner's policy covers their own unit's damage first, and the insurers sort out who was at fault afterward. That process is called subrogation, and it happens between the insurance companies, not between you and your neighbor. Your job is to get your own claim open and your own unit dried.

What is yours and what is the association's

Read your condo documents. Most Massachusetts associations use a "walls-in" split: the association's master policy covers the structure, common pipes, and shared walls; your HO-6 policy covers everything inside your unit including drywall, flooring, cabinets, and contents. If the leak came from a pipe in a shared wall or a roof, the master policy may be primary. If it came from a neighbor's dishwasher, their policy is where subrogation ends up.

What to do in the first hour

1. Get the water stopped. Knock, call, or get the super to shut the valve upstairs.
2. Photograph everything before you move a thing. Ceiling, walls, floor, furniture.
3. Call a restoration contractor to start drying. Your policy requires you to prevent further damage, and the clock on mold is 48 hours.
4. Open a claim on your own policy. Do not wait for the neighbor's insurer to call you; they will not.
5. Notify the association in writing, even if you think it is not their problem.

The HVAC leak pattern

In newer condo buildings around Boston, the most common source is a condensate line or a failed fitting on a mini-split or air handler in the unit above. These leak slowly, for weeks, inside the ceiling cavity, and you do not see it until drywall sags or mold appears. By then both units need remediation. We worked a South Boston job this summer where the upstairs unit's HVAC leak had been running long enough to put mold in both units; the downstairs rebuild went through the owner's policy and the upstairs through theirs.

Why one contractor for both units helps

When both units use the same restoration company, the moisture documentation is consistent, the drying is coordinated, and the adjusters get one set of photos instead of two conflicting stories. It usually gets both claims paid faster.