Roofing Contractor in Union City, CA

Decoto hills, Alvarado flats and rows of shared townhome roofs

Union City formed in 1959 when Alvarado and Decoto joined, and most of its homes went up over the next three decades. The flats toward I-880 hold 1960s–80s subdivisions with shingle roofs now on their second covering. East of Mission Boulevard, streets climb toward the hills and the Hayward Fault runs along their base, where ground movement shows up on roofs as cracked tile, gaps at chimney flashing and stucco pulling away from roof-to-wall joints.

The other big share is attached housing. Townhome and condo HOAs here often have one continuous roof across several units, with valleys and crickets draining from one owner's section into another's. A leak that shows in unit 3 can start above unit 4, so we trace water across the whole run before anyone pays for a patch.

Weather does the rest. Afternoon wind comes in off the bay across the Alvarado flats, lifting brittle shingle tabs on long two-story ridges, and winter storms from November through March overload the gutters on townhome rows, which then spill against shared walls. Streets on the hill side sit below oak-covered slopes, so leaves and twigs collect in valleys and at roof-to-wall crickets. Hail and snow are rare enough here that we don't sell repairs for them.

Alvarado's sugar mill, Decoto Road and the BART station district

Union City had about 66,196 residents by the Census Bureau's 2024 estimate, and its two old towns still shape how we find a house. Alvarado, on the west side, served as Alameda County's first county seat in the 1850s, and in 1870 E. H. Dyer opened the nation's first successful beet sugar factory there; the site on Dyer Street is California Historical Landmark No. 768. Decoto grew up along Decoto Road toward the hills.

• Getting in: I-880 to Alvarado-Niles Road or Decoto Road, with Mission Boulevard running along the foot of the hills on the east side.
• The BART station district: Union City station opened in 1972, and the newer apartment and townhome buildings near it bring low-slope roof sections into the mix.
• Dry Creek Pioneer Regional Park: East Bay Regional Park District land in the hills above town; streets just below it see more wind and oak litter than the flats.
• Alameda Creek: its flood-control channel and the regional trail beside it run along the city's southern edge toward the bay.

What we can and can't point to in Union City yet

We don't have Union City project photos to post or a review from a Union City address. Here is what we can stand behind: the city is inside our service area, the route from Campbell is I-880 the whole way, and our 64 Google reviews include neighbors who replaced a shared townhome roof together and a townhouse owner whose recurring leak another roofer had only patched.

Services Union City owners and HOA boards book most

• Shared-roof reroofs: one plan and one estimate for adjoining units, so seams between owners don't become the next leak.
• Leak tracing on attached homes: we follow water across party walls and valleys instead of patching the first stain.
• Hillside repairs east of Mission Boulevard: tile resets, chimney and wall flashing, and ridge caps loosened by wind.
• Gutters on the flats: replacing undersized or sagging runs on 1970s ranch and two-story homes.

How a Union City roofing contractor visit runs, start to permit

Once the date is confirmed, we walk the roof, check the attic, and send a photo of each problem with a short note. The free estimate comes in writing, itemized, with repair and replacement priced separately. For an HOA we can write it so the board sees common-area roof work apart from items an owner might handle. Permits for reroofs in Union City come from the City of Union City's building division; on unusual board-managed projects we tell you which approvals the city and your HOA each need before work begins.