St. Helena Multifamily Exterior Siding & Windows Renovation

Bay Area Siding Company re-sides and re-windows apartment buildings, condominium and townhome communities, and small commercial properties in St. Helena and across the Napa Valley. This page is for property managers, HOA boards, and building owners. We are a Marin-based siding and window contractor. On a multifamily job, the cladding and glass are only half the work. The other half is running a large exterior project on an occupied property without losing control of the schedule, the budget, or resident goodwill.

Planning a building or community-wide project? Request a bid or call (415) 619-5167 to schedule a consultation and site walk.

What changes when the building is occupied

A single-family re-side has one household to coordinate with. A St. Helena apartment building or HOA community has many. Some residents work nights, some work from home, and some have pets, gardens, or patios pressed against the walls we need to reach. We plan the job around that from the start:

• Phasing by building, elevation, or stack. We work one section of the property at a time rather than opening the whole site at once. Each area is closed up and weather-tight before we move to the next.
• A schedule you can hand to residents. We give you a sequence and a timeline before work starts, so notices go out ahead of each phase. Where window work requires entering a unit, we schedule around the written entry notice you're obligated to give tenants.
• Controlled daily footprint. That covers staging areas, debris handling, and access routes kept clear of entries, parking, and shared walkways. We clean up at the end of each day, not just at the end of the job.
• One point of contact. Board members and managers shouldn't have to relay questions between crews. We keep a single line of communication and report progress on an agreed cadence.

Code, fire, and permit exposure across many units

On a multifamily property, a code question gets multiplied by every unit and every opening, so we sort them out during scoping rather than mid-project.

Permitting. Exterior re-cladding and window replacement are permitted work in St. Helena. The authority that reviews and inspects them is the City of St. Helena Building Division, within the Community Development Department. Window replacement typically includes Title 24 energy compliance documentation for the new fenestration. Performance targets vary by climate zone and code cycle, so we confirm the values in effect when the permit is pulled rather than working from a fixed number. We prepare and manage the submittals.

Wildfire. Fire exposure is a real factor in this part of the valley. The 2020 Glass Fire burned into the St. Helena area. Cal Fire's 2025 Local Responsibility Area maps also designated additional upvalley ground as elevated fire hazard, including sections between St. Helena and Calistoga. On a parcel inside a designated zone, the California fire provisions in Chapter 7A can reach specific exterior assemblies. Examples include wall coverings and altered window openings, where multi-paned glazing with at least one tempered pane is generally required. Whether and how that applies depends on the parcel, the product, and whether the work counts as a repair or an alteration. We confirm it with the AHJ before specifying materials. For a board, getting this right once across the whole property is far cheaper than finding out building by building.

Historic context. St. Helena has a National Register historic district and a documented stock of older buildings near downtown. If your property is in or near the historic core, design considerations may apply on top of the building permit. We check what applies to the address before finalizing profiles, colors, and window styles.

Choosing materials for a portfolio, not a single house

Material choice on a multifamily property is mostly about total cost over the building's life. That means upfront price, the repaint cycle, repair logistics on occupied units, and how the exterior holds up in the valley's hot, high-UV summers. We walk the options with you. The ones that come up most:

• Fiber cement and James Hardie. Fiber cement is noncombustible and resists rot and pests, so it is frequently the lead candidate where any part of a property carries a fire-hazard designation. James Hardie's HZ10 line is formulated for California conditions. ColorPlus factory finishes carry a 15-year finish warranty when installed to spec, which can stretch the repaint cycle an HOA budgets for. The substrate carries a transferable 30-year non-prorated limited warranty under the same condition.
• LP SmartSide. This engineered wood is lighter and more impact-resistant than fiber cement and has a warm wood texture. It needs periodic painting, which should be built into reserve planning.
• Vinyl. Vinyl is the most budget-conscious route and never needs repainting. The trade-off is that some products can fade or distort under sustained heat, and dark colors are limited on some lines. We'll be straightforward about where it fits a valley exposure and where it doesn't.

For HOA communities, architectural consistency matters as much as the product. We help boards lock in profiles, trim details, and colors that match the governing documents and any architectural review requirements. That way a building done this year still matches one done in a later phase. There's more on single-building material decisions on the St. Helena siding replacement page and the St. Helena James Hardie page.

Windows as part of the same project

Window replacement is often scheduled alongside re-siding, and doing both together has practical advantages. With the cladding off, openings can be re-flashed properly as part of the new water-management layer. Residents also get one disruption instead of two.

We install windows from Anlin, Milgard, Andersen, Marvin, and Pella, plus aluminum where a slim sightline suits the design. We recommend lines based on budget, unit count, and exposure. West-facing elevations in the valley take a real heat load, so dual-pane, Low-E glass is usually a meaningful comfort upgrade for residents.

We use both retrofit (insert) installs, which keep the existing frame, and new-construction (full-frame) installs, which go back to the rough opening. The choice depends on what the openings show. Details are on the St. Helena window replacement page and the window replacement hub.

How we handle the building envelope

Removing old siding does not mean taking a wall down to the framing. A standard tear-off removes the cladding and exposes the sheathing or substrate, the water-resistive barrier (WRB), and the flashing. That's what we inspect.

Across a multifamily building, conditions vary from elevation to elevation. One side may be sound while another hides moisture damage around decks, balconies, or windows. We document what we find as each section opens and show it to you before the wall is closed. Repairs are priced transparently rather than buried. Framing only enters the picture if the sheathing itself has failed and has to come off, which is a larger scope we flag separately.

What drives cost on a multifamily project

We don't publish prices, because building projects vary too much for a figure to be meaningful. The main drivers are:

• Number of buildings, stories, and total wall area
• Access, including scaffolding or lifts, tight setbacks, and landscaping
• Material and finish selection
• Concealed substrate repair found at tear-off
• Whether windows are included, and how they're installed
• Phasing requirements set by occupancy
• Any fire-zone or historic-district requirements tied to the parcel

We can structure a bid by building or by phase, which helps boards match the work to reserve funding or special-assessment timing.

Examples of our exterior work are in the projects gallery, and nearby communities are listed on the Wine Country service area page.

FAQ

Can residents stay in their units during a re-side? In most cases, yes. We phase the work so each section is closed and weather-tight before moving on, and we coordinate with you on notices. Units only need to be entered when interior window access is required, and we schedule that ahead of time.

Our property is near the upvalley fire-hazard areas. Does that change what we can install? It may. Cal Fire's 2025 maps designated additional upvalley ground, including sections between St. Helena and Calistoga. On a designated parcel, Chapter 7A can apply to wall coverings and altered window openings. The specifics depend on the parcel and scope, and we confirm them with the City of St. Helena Building Division before specifying materials.

Can the work be split across more than one budget year? Yes. We can scope and price the property building by building or phase by phase. Materials and details stay consistent so later phases match earlier ones.

Who handles permits? We do. We prepare and manage submittals with the City of St. Helena Building Division, including Title 24 documentation for window replacement, and coordinate inspections.

Ready to scope your property? Request a bid or call (415) 619-5167 to schedule a consultation and site walk with our team.