Union City Siding & Windows Replacement

Bay Area Siding Company replaces siding on Union City homes across the bay-plain neighborhoods of southern Alameda County — the older cottages in Decoto and Alvarado and the postwar and mid-century tracts that fill most of the city. We're a Marin-based (Larkspur) siding and window contractor, and we take a re-side start to finish: tear-off, a real look at the sheathing and framing, weather barrier, flashing, and cladding installed to the manufacturer's specification.

Ready to move forward? Request an estimate or call (415) 619-5167 to walk through your project.

When re-siding beats another repair

A lot of Union City's single-family stock went up between the 1950s and the 1970s, and a good share of it still wears the cladding it was built with — mid-century plywood-panel systems, T1-11 grooved sheets, hardboard lap, and older wood. Those materials have a service life, and once they reach it, patching stops paying off. Look for:

• Grooved T1-11 or panel siding that's delaminating, swelling at the bottom edge, or checking along the grain
• Hardboard or composite lap that's soft, chalky, or crumbling where it meets the ground or a hose bib
• Caulk and paint that fail season after season no matter how carefully they're redone
• Sections that give or flex under hand pressure, or fasteners backing out
• Musty odors, staining, or bubbling paint on interior walls that back up to the exterior

When two or more of these show up together, the wall is usually telling you the problem is behind the surface, not on it.

Why a full tear-off beats siding over the top

It's tempting to fur out and cover a tired wall, but on a home of this era that hides the exact things worth checking. Original mid-century tracts frequently went up before building-paper and flashing details were what they are now, and some never had a proper water-resistive barrier at all. Taking the old cladding off is the only way to see the sheathing, find concealed rot around windows and at the mudsill, and rebuild the drainage layer correctly. Covering over also stacks weight on the wall and can seal moisture in. Tear-off costs more at the start and leaves you a wall that's right from the sheathing out.

Choosing a material

We install several systems and will lay out the trade-offs at your house rather than over the phone. A few starting points:

• James Hardie fiber cement — durable, low-maintenance, noncombustible fiber cement; a common upgrade path off T1-11 (see the local Union City James Hardie page)
• Fiber cement — the wider category, other manufacturers included
• LP SmartSide — engineered wood that keeps a warmer, wood-grain look
• Vinyl siding — a lower-cost, low-maintenance choice where it suits the home

We also work in CertainTeed, wood, and aluminum. On a mid-century ranch or a two-story tract home, the material conversation is usually about matching the horizontal lines the house was designed around while cutting the repainting cycle.

What to expect: our process

1. Consultation — we look over the existing walls, talk through goals, and get a sense of budget.
2. Measure and spec — exact measurements and a written scope of work.
3. Permit — we pull the City of Union City building permit the job calls for before work starts.
4. Tear-off and substrate inspection — old cladding comes off and we inspect sheathing and framing before anything new goes up.
5. Weather barrier and flashing — a water-resistive barrier and flashing at every opening and penetration, installed to shed water.
6. Install to spec — new siding fastened and detailed to the manufacturer's instructions.
7. Finish and walkthrough — trim, finish, cleanup, and a final review together.

Union City-specific things to know

Permits. Exterior residential work in Union City runs through the City of Union City Building Division. The city publishes a "Work Not Requiring a Construction Permit" list for minor items, and a full siding replacement falls outside it — a re-side is a permitted alteration. Small like-for-like patch repairs may be another matter, so the honest answer is that scope decides it, and we confirm the requirement with the Building Division as part of scoping rather than guessing.

Not a fire-zone city — plan for the real conditions instead. Union City sits on the flat of southern Alameda County and is not in a Very High or High Fire Hazard Severity Zone the way the East Bay hill cities are, so this isn't a project where Chapter 7A ignition-resistance drives the material choice. What actually shapes the spec here is bay-plain weather: damp, foggy winters, wind off the bay, and warm-to-hot late-summer afternoons inland from the shoreline. That mix rewards a stable, moisture-tolerant cladding and careful flashing far more than it rewards any particular fire rating.

Neighborhoods and housing stock. Union City was formed in 1959 by joining the older Decoto and Alvarado districts, and those two areas hold the city's oldest homes — Alvarado is one of the earliest settlements in the county. Around them are decades of postwar and later subdivisions. That means a re-side here is often a mid-century tract home or an aging T1-11 wall, and the goal is usually a cleaner, lower-maintenance exterior that still reads true to the era.

What affects the cost

We don't post prices because no two walls are alike. The real drivers are the size and number of stories on the home, the cladding you choose, how much concealed substrate repair turns up once the old material is off, whether trim and windows are being integrated at the same time, and access around the lot. A walkthrough is the only way to price it honestly.

Frequently asked questions

Do I need a permit to replace siding in Union City? A full re-side is a permitted alteration through the City of Union City Building Division; it isn't on the city's "work not requiring a permit" list. Minor repairs can be different, so we confirm the exact requirement for your scope before we start, and we handle the paperwork.

My house still has the original T1-11 — is that worth replacing? Often, yes. Grooved plywood panels that are delaminating, swelling, or holding moisture are a common reason Union City owners re-side, and it's usually the moment to upgrade to a more durable, lower-maintenance material and correct the barrier and flashing underneath.

Is fire-rated siding required here? Union City is on the bay plain and isn't in a designated fire-hazard zone, so noncombustible cladding isn't mandated the way it is in the East Bay hills. Fiber cement is still a strong choice here for durability and low upkeep — just for different reasons.

How long will a re-side take? It depends on the home's size, the material, what we find at tear-off, and permitting. We give you a realistic timeline once we've measured and scoped the work.

Get started

We'll look at your walls, talk through materials, and lay out the process end to end. Doing windows too? See Union City window replacement, or explore the wider East Bay service area and finished work in our project gallery.

Call (415) 619-5167 or request an estimate.