Free roof inspection with deck photos before we talk money - GAF and Owens Corning certified installation
Before
After
Before
After
Before
AfterFast, Reliable Roof Replacement Across Union City
Most Union City homeowners replacing a roof spend between $12,000 and $28,000 for a complete asphalt shingle replacement on a typical single-family home, with the job taking 2 – 5 days from tear-off to final inspection. We’re Crestview Roofing, and our crews work Union City regularly, from the older ranch homes near Decoto Road to the newer developments off Whipple Road. Our San Francisco Bay Area office coordinates scheduling and dispatch, so we’re not driving in blind from Sacramento or San Jose. You get a live trackable arrival time, a written price before any shingle comes off, and before-and-after photos sent to your phone. Call (325) 246-5075 to schedule your free estimate.
Why Crestview Roofing Is Union City’s Preferred Roof Replacement Company
We’ve been replacing roofs since 2000, and Union City’s mix of 1950s tract housing, 1970s split-levels, and newer infill near the BART corridor means we’ve seen nearly every roof type and condition the Bay Area throws at us. The marine layer that rolls in off San Francisco Bay sits on Union City longer than it does inland cities, and that persistent moisture is hard on roof decking, especially on homes with inadequate attic ventilation.
Our customers in the Alvarado and Old Alvarado neighborhoods tell us the same thing: they chose us because we showed up when we said we would, sent a photo of the technician before he arrived, and never changed the price after work started. That’s The Relay Visibility Guarantee in action, and it’s how we do every job in Union City.
Calls are answered by a live person, 24/7. No voicemail loops, no “call back Monday” when your ceiling stain is spreading on a Saturday evening.
Every replacement comes with our 365-Day Done Right Promise. If anything we install fails within a full year, we fix it at no charge, including a free second visit. It’s in writing, included with every job, no extra cost.
Flat Roof Replacement in Union City
Flat Roof Replacement in Union City, CA addresses the low-slope roofs common on Bay Area additions, ADUs, and commercial-style residential builds where standard shingles won’t shed water properly. In Union City, we see these most often on garage conversions in the Decoto area and on mid-century homes near Alvarado Boulevard where the original design used tar and gravel or early membrane systems now past their lifespan. A typical flat roof replacement here runs $8,500 – $18,000 depending on square footage, whether the insulation board needs replacement, and whether we upgrade to a modern TPO or modified bitumen system.
Drainage and Ponding Issues
Flat roofs in Union City collect water where the marine layer keeps surfaces damp for days. We inspect scuppers, interior drains, and crickets (the tapered wedges that divert water) as part of every replacement. Poor drainage that gets fixed during tear-off prevents the callbacks we see from homeowners who only replaced the membrane and left the slope problems untouched.
Building Code and Energy Upgrades
Union City falls under California Title 24 energy requirements, which means replacement flat roofs need minimum R-30 insulation value in most cases. We handle the insulation upgrade, the permit pull, and the inspection scheduling so you don’t have to coordinate with the city yourself.
Roof Replacement Contractor in Union City
Roof Replacement Contractor in Union City, CA means a company that handles the full scope, not just the shingles. At Crestview Roofing, we manage permit applications with the city, coordinate dumpster placement on tight Union City streets, protect landscaping during tear-off, and pass all inspections before we call the job complete. A full asphalt shingle replacement on a 1,800-square-foot Union City home typically runs $14,000 – $22,000 using architectural shingles from GAF or CertainTeed, while premium upgrades or complex rooflines can push toward $28,000.
Decking and Structural Repairs
Union City’s older homes, particularly in the Alvarado district, often have original 1×6 plank decking that’s warped, delaminated, or hiding old leaks. We don’t cover bad wood with new shingles. If your decking needs replacement, we quote it upfront, in writing, before work starts, typically adding $2,000 – $5,000 to the total depending on how much needs swapping out.
Manufacturer Warranties That Transfer
We install systems qualified for GAF Golden Pledge and CertainTeed SureStart Plus warranties, which cover materials and workmanship for 50 years and are fully transferable when you sell your Union City home. That’s a real selling point in this market, and we register every warranty so you don’t have to track paperwork.
Trusted Brands We Service in Union City
We install GAF, CertainTeed, and Owens Corning roofing systems on Union City homes, and we stock common repair components locally so we’re not waiting on delivery trucks from across the Bay. Our crew leaders are certified in the installation methods each manufacturer requires for full warranty coverage, and we pull the exact shingle color samples from our inventory so you see your actual material, not a screen rendering, before you commit. For homeowners near the Union Landing shopping area or up in the hills toward the Hayward border, that means faster turnaround from estimate to completion and no surprises about what your roof will actually look like.
Common Roof Replacement Problems We See in Union City Homes
- Attic condensation from marine air. Union City’s proximity to the Bay means overnight humidity stays elevated through much of the year. Poor ventilation traps that moisture against the underside of roof decking, causing rot that isn’t visible from the street until tear-off reveals spongy plywood.
- Original shingle failure on 1960s – 1980s homes. Many properties near Decoto Road and the older Alvarado streets have roofs that were last replaced in the 1990s with 20-year shingles now well past their functional life. The granules wash into gutters, the tabs curl, and the underlayment becomes the only waterproof layer left.
- Valley leaks from accumulated debris. Oak and sycamore trees line several Union City neighborhoods, and leaves pack into valleys and behind chimneys. When the organic matter holds moisture against flashing for months, the metal corrodes and water finds its way to ceilings.
- Flat roof membrane splits from thermal cycling. The Bay Area’s temperature swings, narrow compared to inland California but still significant across seasons, stress older modified bitumen and EPDM membranes. We see this most on garage conversions and second-story additions where the original builder used residential-grade materials on a low-slope surface.
Pricing for Roof Replacement in Union City, CA
Here’s what Union City homeowners actually pay for roof replacement with Crestview Roofing:
| Service | Typical Range |
|---|---|
| Basic asphalt shingle replacement (1,500 – 2,000 sq ft) | $12,000 – $18,000 |
| Architectural shingle upgrade with new underlayment | $16,000 – $24,000 |
| Complex roofline (multiple valleys, steep pitch, dormers) | $20,000 – $28,000 |
| Flat roof replacement (TPO or modified bitumen) | $8,500 – $18,000 |
| Roof decking replacement (per 500 sq ft) | $2,000 – $5,000 |
What moves you within these ranges? Roof size and pitch are the big ones. Steeper roofs take longer and require more safety setup. The number of layers being torn off matters too, Union City has plenty of homes with two layers that need to go to the deck before new shingles go down. We give you a written, line-item quote before any work begins. The number on that page is the number on your invoice. No change orders unless you add something, and even then, we write it down and you approve it first. Call (325) 246-5075 for your free estimate.
We Also Serve Cities Near Union City
Our crews work throughout the East Bay, and we regularly handle Roof Installation in Union City and surrounding communities. If you’re in Fremont, Newark, San Lorenzo, or Castro Valley, the same live-trackable arrival times, written pricing, and 365-Day Done Right Promise apply. We also offer Roof Repair in Union City for homeowners who aren’t ready for full replacement but need targeted fixes that last. For a complete overview of our replacement services, visit our main Roof Replacement page, or learn more about what we offer specifically for Roof Replacement in Union City.
Serving Union City, CA – Our Local Coverage Area
We’re based in the Union City area and know this community well. Use the map below to see our service coverage – if you’re nearby, we can almost certainly help.
FAQs About Roof Replacement in Union City
We typically schedule estimates within 2 – 3 business days for Union City addresses, and our San Francisco Bay Area dispatch office routes crews efficiently to minimize drive time to neighborhoods from Alvarado to the newer developments near Whipple Road. Call (325) 246-5075 to check next available openings, estimates are free.
Yes, we replace roofs throughout Union City, including Alvarado, Old Alvarado, the Decoto corridor, and the residential areas between Union Landing and the Hayward border. Our crews know the local permit requirements and inspection schedules, so work moves smoothly regardless of which ZIP you call home.
We provide emergency tarping and temporary weatherproofing when a roof fails suddenly, but full replacement is planned work that requires permits, material orders, and dry weather for proper installation. If you’re facing an active leak, call (325) 246-5075 and we’ll get a technician out to secure your home while we schedule the permanent replacement.
Union City pricing sits in line with Fremont and Newark, slightly below Peninsula markets like Redwood City due to lower permit fees and easier crew access. Your specific home, not your ZIP code, drives most of the cost. Call (325) 246-5075 for an exact quote, estimates are free.
Every replacement includes our 365-Day Done Right Promise covering workmanship, plus the full manufacturer warranty on materials, up to 50 years on qualifying GAF and CertainTeed systems. Both are in writing, included at no extra cost, and transferable to the next owner when you sell your Union City home.
Written by Dylan Pace, Owner at Crestview Roofing, serving Union City since 2000 as part of the Relay Home Co. family.