Exterior renovation on a multi-unit property is a different job than a single-family re-side, and it's run differently. You're balancing a budget across many units, keeping tenants or homeowners in place while the work happens, holding a consistent look across a community, and satisfying code and fire requirements building by building. Bay Area Siding Company, a Larkspur-based siding and window contractor, handles multifamily and HOA exterior work in Clayton — re-siding and window replacement at portfolio scale, planned around the people who live there.

This page is for property managers, HOA boards, and apartment and rental owners. If you're a single-family homeowner, start with Clayton siding replacement or window replacement instead.

Planning a community or portfolio project? Call (415) 619-5167 or request a bid.

What we do for multi-unit properties

• Full-community and building-by-building re-siding — tearing off failing cladding across many units and re-cladding to a consistent, board-approved standard.
• Portfolio window replacement — matched units across buildings, with retrofit or full-frame installs chosen per opening.
• Combined siding-and-window scopes — sequenced so flashing and cladding integrate correctly, done once rather than as separate disruptions.
• Phased scheduling for occupied buildings, so no household loses use of their home longer than necessary.

Clayton's multifamily and HOA reality

Clayton's residential growth through the 1980s and 1990s produced a number of planned developments and community associations — the Oakhurst and Keller Ranch build-outs among them — alongside condominium and townhome stock and smaller rental buildings. Two things shape exterior work on these properties.

First, architectural consistency matters to boards. A community that re-sides has to come out looking like one community, not a patchwork — same profile, same color program, same trim details across every building, often governed by the association's architectural guidelines. We work to a single approved standard across the whole scope and document it so the board can approve once and hold the look.

Second, fire-zone compliance applies at scale. Cal Fire's updated maps place much of Clayton in a Very High Fire Hazard Severity Zone, and in designated fire-hazard areas California Building Code Chapter 7A can require noncombustible or ignition-resistant exterior wall coverings and specific glazing at altered openings — depending on the parcel and the scope of work. Across a multi-building property, that's a decision with real budget and material implications, which is why it's worth settling early. Noncombustible fiber cement is frequently the material of record on Clayton foothill parcels for exactly this reason. We confirm what applies to each property with the Contra Costa County Building Division rather than assuming.

Working around tenants and residents

The hardest part of occupied multifamily work isn't the siding — it's doing it without upending people's lives. We plan the sequence around that: staging that keeps entries, parking, and egress usable; clear resident notice ahead of each building or elevation; predictable daily start and stop; and a work order that moves through the property in a logical progression so any given household is affected for the shortest sensible window. For owners, that also protects occupancy and reduces the friction that generates complaints and turnover.

Budgets and the long view

Boards and owners are spending shared or invested money, so the exterior decision is as much financial as aesthetic. A durable, low-maintenance cladding costs more up front and less over the hold: noncombustible fiber cement, for instance, takes repainting and rot repair largely off the reserve schedule compared with aging wood or hardboard, and it addresses the fire-zone question at the same time. On windows, moving a community off failed-seal, single-pane, or draft-prone units cuts resident complaints and energy load. We lay out the trade-offs so a board can weigh first cost against the reserve study and the maintenance runway — not just the lowest bid.

Permitting and how a portfolio job runs

The City of Clayton contracts its building function to the Contra Costa County Building Division, which handles plan check, permits, and inspections. We manage the permitting for the scope. The work follows the single-family logic at multiplied scale: remove cladding down to the sheathing and substrate, inspect and renew the water-resistive barrier (WRB) and flashing at every opening, then install siding and windows to spec, building by building. Concealed substrate repair is more likely to surface across an aging multi-unit property, so we build assessment and a change process into the plan rather than pretending every wall is identical. Framing is only involved where sheathing has failed — flagged and priced as added scope.

Cost drivers on multi-unit work

The number is driven by unit count and building configuration, the cladding and window systems chosen, how much concealed repair the tear-offs reveal, access and staging across the site, the phasing required to keep buildings occupied, whether fire-zone assemblies apply, and whether siding and windows are combined. We scope it against the actual property, not a per-unit guess.

Comparing materials for a board packet? See fiber cement, vinyl, CertainTeed, and LP SmartSide; for windows, the window hub. Review completed work in our project gallery and our Contra Costa service area.

FAQ

Can you keep our buildings occupied during the work? Yes — occupied phasing is standard for multifamily. We stage to keep entries, parking, and egress usable, notify residents ahead of each building, and sequence the work so any household is affected for the shortest reasonable window.

How do you keep the look consistent across an HOA community? We work to a single board-approved standard — profile, color, and trim — across the entire scope and document it, so the association approves once and the community comes out matching rather than patched.

Does the Clayton fire zone affect a whole multifamily property? It can, at scale. Much of Clayton is in a Very High Fire Hazard Severity Zone, and Chapter 7A may require noncombustible cladding or specific glazing at altered openings depending on each parcel and scope. We confirm requirements with the Contra Costa County Building Division and factor them into the material spec and budget up front.

Do you provide documentation our board or ownership needs to approve a bid? Yes. We provide a clear scope and material spec suited to board review and reserve planning, and we're glad to walk boards or owners through the trade-offs between first cost and long-term maintenance.

Let's scope your Clayton property

Call Bay Area Siding Company at (415) 619-5167 or request a bid. We'll walk the property, assess the buildings, and build a phased plan and material spec your board or ownership can act on.