First questions to answer
Before any remediation starts in an attached home, get these answered in writing if you can.
- Where is the water coming from: your unit, a neighbor's unit, or a common element such as the roof or siding?
- What do your declaration and the sub-association's documents say about who maintains that wall, pipe or roof section?
- Does the association carry a master policy, and what does it cover inside individual units?
- Does your own policy include coverage for the interior finishes the master policy excludes?
- Has the neighbor or the association been told in writing, with photos?
Why attached homes are different
In a detached house, the owner controls every pipe and every wall. In a townhome, a party wall separates two households, and plumbing, roof drainage and even attic space can be shared or arranged in ways that send one unit's water into another. A supply line failure behind a neighbor's washer can wet your side of the wall without any sign on theirs.
Many townhome communities in the area have a sub-association that maintains roofs and exteriors, while owners handle interiors. Where exactly the line falls varies from community to community. Some documents draw it at the drywall, others at the studs. That line often decides who arranges and pays for remediation of which materials.
Mold does not respect property lines. If the moisture source sits in the neighbor's unit, cleaning only your side leaves the cause untouched, and growth on their side can reseed yours.
Common townhome scenarios
| Source | Who is often responsible | What to confirm |
|---|---|---|
| Neighbor's plumbing leak | Usually the neighbor and their insurer | Your governing documents and both policies |
| Roof or flashing leak | Often the sub-association, where it maintains roofs | Whether the declaration assigns roofs to the association |
| Shared attic with a loose fan duct | Varies; the fan's owner or the association | Who owns ducts that pass through common space |
| Your own shower or water heater | You and your insurer | Whether moisture crossed into the neighbor's unit |
| Exterior grading or gutters | Often the association | Whether drainage is a common element |
Practical order of operations
Document
Photograph the damage, take dated notes and save every email or letter.
Notify in writing
Tell the neighbor and the association management company what you found and when.
Call your insurer
Report the loss even if you think another party is responsible. Insurers can coordinate with each other.
Coordinate access
A contractor may need to inspect both sides of the party wall. Arrange access early.
Keep remediation records
Keep the scope, photos and any clearance results. A future buyer will ask.
General information for Highlands Ranch, not a quote or professional advice. In an emergency, call 911.