Union City Multifamily Exterior Siding & Windows Renovation

If you manage an apartment community, sit on a condo or townhome association board, or own a rental building in Union City, an exterior renovation is a capital project. It needs a clear scope, a defensible budget, and a schedule that keeps residents housed and informed while the work moves around them. Bay Area Siding Company re-sides buildings and replaces windows for multifamily and light-commercial properties across the Bay Area from our base in Larkspur. We plan the work building by building, so a board or owner can approve it, fund it, and explain it to residents.

Planning a re-side or window project? Request a bid or call (415) 619-5167 to set up a site walk.

Start with a condition survey

Many multifamily exteriors in Union City went up alongside the city's postwar and mid-century growth. The city was incorporated in 1959 from the older Decoto and Alvarado districts, and the decades of building that followed used the materials of their time. Those include grooved plywood panel siding such as T1-11, hardboard lap, and older painted wood. On a single house, one failing wall is a weekend of worry. On a complex, the same failure pattern tends to repeat across every building that faces the same way or shares the same details.

That's why we start with a walk of the whole property instead of a quote per elevation. We look for:

• Swelling, delamination, or soft bottom edges on panel and hardboard siding, especially near grade, sprinklers, and downspouts
• Paint that fails first on the same exposures every cycle
• Staining or rot at window sills, trim, and the joints where balconies, stairs, and walkways meet the wall
• Resident reports of leaks or damp drywall on shared wall types

The survey tells you whether you're facing isolated repairs or a systemic re-side. It also shows where to start if the work has to be phased over several budget years.

What the work actually involves

A proper re-side removes the old cladding down to the sheathing. That exposes the sheathing, the water-resistive barrier (WRB), and the flashing so they can be inspected. Where sheathing has deteriorated, usually around openings and at the base of walls, we replace those sections. Framing only comes into play if the damage goes deeper than the sheathing, and we document that and discuss it with you before it changes the scope. From there, a new WRB goes on, and every window, door, and penetration is flashed. The new siding is then installed to the manufacturer's specification.

Covering old siding with new siding can look cheaper on a bid sheet. On a multi-building property, though, it hides the same concealed damage many times over, and it leaves a board or owner with no record of what's behind the wall.

Window replacement follows the same logic. A retrofit (insert) install sets a new unit inside the existing frame. It's faster and less disruptive for occupied units. A new-construction (full-frame) install removes the old frame so the opening's flashing can be rebuilt, which is the right call where sills show rot or water history. On many complexes, the answer is retrofit for most openings and full-frame where the survey shows trouble. Combining windows with a re-side is often efficient, because the flashing at each opening is being redone anyway.

Phasing around residents

Occupied buildings are the defining constraint of multifamily work, and the schedule deserves as much attention as the spec. We build the plan with management or the board:

• Building-by-building or stack-by-stack sequencing. Scaffolding, tear-off, and cleanup are confined to a defined area and finished before moving on.
• Advance notice for interior access. Window replacement requires entering units, and California law (Civil Code §1954) requires reasonable written notice to tenants for entry. We give management the unit schedule early so notices go out properly.
• Daily site protection. Walkways, parking, landscaping, and entries stay usable, with debris removed as we go.
• One point of contact. Resident questions go through management or the board, not to crews on ladders.

Weather matters for staging too. Union City's damp, foggy winters and wind off the bay favor scheduling so that walls opened in the morning are wrapped by day's end. The warm late-summer afternoons inland from the shoreline affect paint and caulk application windows.

Permits in Union City

Exterior alterations in Union City are permitted through the City of Union City Building Division. A full re-side or window replacement is not on the city's list of work that doesn't require a permit. Window replacement also carries a Title 24 energy-compliance submittal for the new fenestration.

Multifamily buildings can bring review considerations a single-family re-side doesn't. Depending on the building's size, occupancy, and construction type, some wall assemblies may have fire-resistance requirements, such as walls close to property lines or between buildings. We confirm what applies to your specific buildings with the Building Division during scoping rather than assuming.

Union City sits on the bay plain and is not in a Very High or High Fire Hazard Severity Zone. Wildland-urban-interface (Chapter 7A) requirements are therefore not generally what drives the material choice here, though we still verify parcel-specific conditions.

Balconies and elevated walkways. California requires periodic inspection of exterior elevated elements. SB 721 applies to apartment buildings, and SB 326 applies to condominium associations. We don't perform those inspections. When a re-side opens the wall where balconies and walkways attach, though, the timing is worth coordinating with your inspector or engineer, so those junctions are flashed and closed up once.

Materials that hold up across a portfolio

For an HOA, architectural consistency usually matters as much as durability. The goal is one approved profile and color scheme applied across every building, and a product line that will still be available when a future phase comes up. We install several systems:

• James Hardie fiber cement and fiber cement generally. Durable, noncombustible, and rot- and pest-resistant, with long repaint intervals, especially with factory finishes. This is a common replacement for failing T1-11.
• LP SmartSide. Engineered wood with a wood-grain look and good impact resistance, which helps on ground-floor walls near parking and landscaping.
• Vinyl and CertainTeed lines. Lower upfront cost and no repainting, where the look suits the property.

For windows, we install Milgard, Anlin, Andersen, Marvin, Pella, and aluminum units. Standardizing on one line simplifies future unit turnovers and replacements.

Budgeting and what drives cost

We don't publish prices, because multifamily bids depend heavily on the property. The main drivers are:

• Total wall area and building height, which set scaffolding and access needs
• How much sheathing replacement the tear-off reveals
• Material and finish choice
• Number of window openings, and the mix of retrofit and full-frame installs
• Balcony, stair, and walkway interfaces
• How finely the work is phased around residents

For associations, a well-documented scope helps the board line the project up with its reserve planning and present it clearly to owners. For rental owners, lower-maintenance cladding changes the long-term repaint and repair cycle, and that belongs in the comparison alongside the upfront number.

See finished exteriors in our project gallery. Single-family owners in town can start with our Union City siding replacement and Union City window replacement pages. We serve properties throughout the East Bay.

FAQs

Do we need a permit to re-side our Union City apartment buildings? Yes. A full re-side or window replacement is a permitted alteration through the City of Union City Building Division. Multifamily buildings may also have fire-rated wall requirements depending on construction type and location, and we confirm those with the Building Division before work begins.

Can residents stay in their units during the project? In most cases, yes. We phase the work by building or section, and we coordinate interior access for window replacement so management can give tenants proper written notice.

Can we phase the work over more than one budget year? Often, yes. A property-wide condition survey identifies the buildings in the worst shape. Standardizing the product line and color keeps later phases consistent with earlier ones.

Is fire-zone construction required for our property? Union City is not in a Very High or High Fire Hazard Severity Zone, so Chapter 7A wildfire provisions generally don't drive the spec. Other code requirements, such as fire-rated assemblies on certain multifamily walls, can still apply and are confirmed per building.

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