11 min read · HOA & Multifamily
Townhome and rowhome siding replacement sits at the intersection of HOA and individual-owner concerns, because the buildings are attached: a single structure may contain several owners' homes, share party walls between them, and fall under governing documents that decide who is responsible for what. The questions that matter most are therefore not just technical — they are about responsibility (HOA versus owner), uniformity (the community has to stay architecturally consistent), and how you phase work across units that physically share a roofline and a wall. This guide works through each, with the party-wall flashing detail that attached construction makes critical. For the governance steps an HOA follows, see our HOA exterior renovation guide; to scope an attached-home community, schedule a multifamily exterior assessment.
Attached construction changes the problem
A townhome or rowhome is not a freestanding house with a neighbor nearby — it is one continuous structure divided into homes, sharing roofs, walls, and often the cladding plane across unit lines. That means the exterior is rarely something a single owner can fully control: cladding runs past the boundary between two homes, the weather barrier and flashing have to be continuous across that boundary, and a change to one unit's exterior affects the look and the watertightness of its neighbors. The first thing to establish on any attached-home re-side is that the building, not the individual unit, is the real scope — even when responsibility for paying is divided. Our multifamily siding replacement pillar frames the broader category; attached homes are the version of it where the units literally share walls.
HOA versus owner responsibility
Who pays for and controls a townhome's exterior is decided by the community's governing documents — the CC&Rs and bylaws — not by intuition, and the answer varies widely. In some communities the HOA owns and maintains all exteriors as common or limited-common elements; in others the individual owner is responsible for their unit's exterior while the association controls only the standards. The practical upshot is that before a re-side proceeds, the responsibility question has to be answered from the documents: which components are HOA, which are owner, how the cost is allocated, and who has approval authority over materials and color. Getting this wrong creates disputes that outlast the construction. We don't interpret governing documents — that is the association's and its counsel's role — but we scope the work so it maps cleanly onto whatever responsibility structure the documents define, and our HOA renovation process guide covers how associations run that governance.
Uniformity and architectural consistency
Townhome and rowhome communities derive much of their value from looking like one coherent place, and the governing documents almost always protect that uniformity. A re-side therefore can't be a free-for-all of individual material and color choices, even where owners pay individually — the community's architectural standards govern the product, profile, and color so the building and the community stay consistent. This is actually an argument for a coordinated, community-wide approach: matching a single owner's replacement cladding to aging neighbors is harder and looks worse than re-cladding the shared building or the community to one current standard. We work within the association's approved palette and product standards — James Hardie's ColorPlus and product lines, for example, give a consistent, repeatable specification across many units — so the result reads as one intentional community rather than a patchwork.
Phasing across attached units
Phasing an attached-home community is constrained by the fact that you can't cleanly stop a re-side at a unit line in the middle of a shared wall. The sensible unit of work is the whole building or the whole shared-wall run, completed before moving on, rather than one owner's home in isolation. Sequence buildings by condition and risk first — worst water-intrusion and dry-rot exposure early — then by logistics and, where responsibility is split, by how the cost allocation and approvals line up. Because attached communities repeat the same building type, once one structure is opened and scoped the rest become predictable, which makes a phased program across the community both fundable and forecastable. Coordinating residents and owners through that sequence matters; our resident communication during construction guide covers keeping attached neighbors informed.
Party-wall flashing done right
The technical heart of attached-home re-siding is the party-wall and unit-line flashing. Where the exterior crosses the boundary between two homes — and where the shared roof, wall, and cladding planes meet — the weather barrier and flashing have to be continuous and correctly lapped so water sheds across the boundary instead of finding the seam, and so the fire separation in the rated assembly is preserved. This is precisely the detail that a unit-by-unit, owner-by-owner approach tends to compromise, because each owner's contractor stops at the property line and the joint between them is no one's responsibility. We treat the unit-line and party-wall transition as a primary flashed detail integrated with the WRB, which is the strongest argument for scoping the building rather than the unit. Our flashing failure guide and water-intrusion prevention guide explain why these transitions are where attached buildings most often leak.
Unit-by-unit vs. building-scoped attached-home re-side
| Consideration | Unit-by-unit approach | Building / shared-wall approach |
|---|---|---|
| Party-wall flashing | Compromised at the unit line | Continuous, correctly lapped |
| Architectural uniformity | Patchwork of products and colors | One consistent community standard |
| Water intrusion | Unflashed old-to-new transition | Whole water plane rebuilt |
| Responsibility | Disputes at the boundary | Maps to CC&R cost allocation |
| Forecastability | Inconsistent, per owner | Phased and predictable |
Key takeaways
- Attached homes are one structure divided into units — the building, not the unit, is the real scope
- Party walls carry both the water plane and the fire separation across the unit line; detail them as primary work
- Who pays and controls is set by the CC&Rs and bylaws — answer the HOA-vs-owner question from the documents first
- Architectural standards govern product, profile, and color; coordinated community-wide work beats a patchwork
- Phase by building or shared-wall run, not by individual owner — you can't stop cleanly mid party-wall
- Party-wall and unit-line flashing is the technical heart of the job; a unit-by-unit approach tends to compromise it
FAQ
Quick Answers
Usually not well. The cladding, weather barrier, and flashing run continuously across the shared party wall, so re-cladding half of a shared wall creates an unflashed transition at the unit line that leaks. The sensible scope is the whole building or shared-wall run, even when cost is allocated by unit.
It depends entirely on the community's CC&Rs and bylaws. Some associations own and maintain all exteriors; others make the owner responsible while the HOA controls standards. The responsibility, cost allocation, and approval authority must be answered from the documents before a re-side proceeds.
Almost always, yes. Governing documents protect architectural uniformity, so the product, profile, and color are governed by the community's standards. This is an argument for a coordinated, community-wide approach rather than individual choices that produce a patchwork.
By building or shared-wall run rather than individual unit, completing each before moving on, since you can't stop cleanly mid party-wall. Sequence worst water-intrusion and dry-rot exposure first, then by logistics and, where responsibility is split, by how cost allocation and approvals line up.
It's the flashing and weather-barrier detail where the exterior crosses the boundary between two homes. It has to be continuous and correctly lapped so water sheds across the boundary and the fire separation is preserved. It's the detail a unit-by-unit approach most often compromises.
No — interpreting governing documents is the association's and its counsel's role. We scope the work so it maps cleanly onto whatever responsibility and approval structure the documents define, and we work within the association's approved product and color standards.
Sources
Authoritative references
- James Hardie — official product & installation resources
- Contractors State License Board (CSLB) — verify a California contractor
- CAL FIRE — California Department of Forestry and Fire Protection
External links to government, code, and manufacturer sources. Sierra Siding is not affiliated with these organizations; references are provided for verification.