Free roof inspection with deck photos before we talk money - GAF and Owens Corning certified installation
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AfterFast, Reliable Roof Installation Across San Leandro
Roof installation in San Leandro typically runs $11,000 to $19,500 for a complete tear-off and re-roof on a standard post-war ranch, depending on roof pitch, layers beneath, and material choice. Most full replacements here take three to five working days once materials are staged. If you’re calling from Washington Manor, Broadmoor, or Estudillo Estates, we know the exact roof profile on your block before we even pull up.
Mercer Roofing has been roofing Bay Area homes since 2000, and our crews know San Leandro’s housing stock the way a local knows the back roads. Call (743) 200-8347 for a written, line-item quote before any work starts. No one touches your roof until you’ve seen the price in writing.
Why Mercer Roofing Is San Leandro’s Preferred Roof Installation Company
San Leandro homeowners keep calling us back because we treat the front door the same way we treat the roof deck: with respect. Every technician who arrives at your home is background-checked, identity-verified, and uniformed. You get their name and photo before they arrive, and they’ll badge in with a photo ID at your door. That’s the Threshold Verified standard, and it matters if you’re home alone, wrangling kids, or simply don’t want to open the door to a stranger you weren’t expecting.
Our reputation in San Leandro is built on roofs that stay watertight through the bay’s salt air and the occasional fall Diablo wind. We’re part of the Threshold Group family, founded in 2000, and every independent location is held to the same standard. The written guarantee on every repair and installation is simple: if it’s not done right within 365 days, we make it right. That promise is on paper, not just in a handshake.
Calls are answered by a live person, 24/7. Not a voicemail. Not a call-back form. When you call about a leak on Estudillo Avenue or a tear-off quote on Dutton, a real human picks up.
Roof Flashing Installation in San Leandro
Roof flashing installation in San Leandro addresses a problem this city knows better than most: salt-laden marine air off the bay corrodes flashing, vents, and fasteners far earlier than the shingles themselves. Flashing is the metal material at every roof penetration – chimneys, vent pipes, skylights, valleys – and in San Leandro’s flatlands, it fails first. Rusted flashing is a leading cause of roof leaks in Washington Manor and Broadmoor, where homes sit fully exposed to the Bay’s northeast-southwest air flow.
When Flashing Fails Before Shingles
On a 1951 ranch, the original galvanized flashing was never engineered for sixty-plus years of salt spray. We regularly replace flashing around plumbing vents and furnace flues on roofs where the shingles still have a decade of life left. If your leak starts at a pipe boot or chimney base, the flashing is the culprit, not the shingle field.
What Flashing Replacement Costs Here
Standalone flashing repair or replacement on a San Leandro home typically runs $350 to $1,200, depending on the number of penetrations and whether the decking around them has rotted. When flashing is done as part of a full roof installation, we include new drip edge, pipe boots, valley metal, and step flashing in the written quote. No separate line item sneaks in later.
TPO Roofing Installation in San Leandro
TPO roofing installation in San Leandro is the right choice for flat or very low-slope sections, like the additions and garage roofs common on post-war ranch homes and the flat-roofed commercial buildings along East 14th Street. TPO is a heat-welded single-ply membrane that reflects UV rather than absorbing it, which matters during San Leandro’s warm autumn stretches when Diablo winds push temperatures up.
TPO on Residential Additions
Many San Leandro ranchers have a flat-roofed sunroom or back addition built in the 1970s and 1980s. Those roofs were often done in hot-mopped asphalt or old rolled roofing that has long since cracked. A fresh TPO membrane seals those sections for 20-plus years and handles standing water better than anything else we install.
What TPO Costs in San Leandro
Residential TPO installation in San Leandro generally runs $8 to $12 per square foot installed, so a 400-square-foot addition roof lands between $3,200 and $4,800. Commercial flat roofs scale similarly by square footage, with thicker 60-mil or 80-mil membranes running toward the higher end. Every TPO job includes a written price and our 365-Day Done Right Promise.
Trusted Brands We Service in San Leandro
We install and repair roofs using shingle brands that homeowners recognize and manufacturers stand behind, including GAF, CertainTeed, Owens Corning, Atlas, and Tamko. For San Leandro customers, that means if you have a GAF warranty question or need Atlas color-matched shingles for a partial re-roof on a Broadmoor home, we can source them fast. We keep common valley metal, drip edge, and flashing stock for San Leandro jobs on hand, which shortens the time between quote and first nail.
If you’ve got a specific shingle brand on your current roof and want the new section to match, tell us when you call. We’ll note it in the quote.
Common Roof Installation Problems We See in San Leandro Homes
- Multiple shingle layers over skip-sheathing. The 1949 – 1955 tract homes in Washington Manor and Broadmoor were built with wood skip-sheathing (spaced boards, not solid plywood) and have often been re-roofed twice since. Tearing off two or three layers of composition shingle adds a full day and extra dumpster fees – and you can’t see it from the curb before the job starts.
- Salt-air corrosion on flashing and fasteners. San Leandro’s position on the Bay’s eastern shoreline means metal roof components rust faster here than in Castro Valley or San Lorenzo. We replace corroded vent collars and chimney flashing on nearly every full install in the flatlands.
- Uplift and cracking from Diablo wind events. Fall winds gusting off the coastal hills tear at brittle, aged shingles on low-pitch roofs with narrow overhangs. If the original drip edge and starter strip were never upgraded, the first row of shingles lifts like a loosened seam.
- Undersized gutters on 1920s and 1930s bungalows. The older Estudillo Estates homes often have original half-round gutters that can’t handle heavy atmospheric river rain. When we install a roof on those homes, we check the gutter capacity and flag it in the quote if it’s undersized.
Pricing for Roof Installation in San Leandro, CA
A complete tear-off and architectural shingle roof installation on a standard 1,200 to 1,500 square-foot San Leandro ranch typically runs $11,000 to $17,500. That includes tear-off of one layer, new synthetic underlayment, ice and water shield in valleys, drip edge, new flashing, and haul-off.
If your home in Washington Manor or Broadmoor has multiple shingle layers stacked over skip-sheathing, expect $1,200 to $2,800 in additional tear-off labor and disposal. Homes in Estudillo Estates with clay tile re-roofs or complex gable intersections run higher, sometimes $19,000 to $26,000 depending on accessibility and sheathing condition.
Every quote is written, line-itemed, and given to you before work begins. No change orders unless you approve them first. Call (743) 200-8347 for a free estimate.
We Also Serve Cities Near San Leandro
Our Roof Installation crews cover San Leandro and the surrounding East Bay communities, including San Lorenzo, Castro Valley, Oakland, and Alameda. If you’re just over the city line, we’ll still come out, scope the roof, and give you the same written quote. Learn more about our San Leandro service area at San Leandro.
Serving San Leandro, CA - Our Local Coverage Area
We’re based in the San Leandro 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 Installation in San Leandro
Because Washington Manor’s 1949 – 1955 tract homes almost always carry two or three layers of composition shingles over original skip-sheathing, while Castro Valley’s housing stock skews newer and typically has a single layer over solid plywood. Tear-off labor, dumpster fees, and the extra crew time add $1,200 to $2,800 to a San Leandro job. Call (743) 200-8347 and we’ll tell you exactly what to expect for your street.
Skip-sheathing is a roof deck made of spaced wood boards rather than continuous plywood or OSB. It was standard on San Leandro’s post-war tract homes because it saved lumber. Today, it matters because shingles can’t be nailed to gaps, which often means adding a solid plywood layer before the new roof goes on. That’s a real cost we flag in the written quote, not after tear-off.
Yes. San Leandro sits directly on the Bay’s eastern shoreline, and the marine layer pushes salt-laden air over the flatlands nearly every night. Metal flashing, vent collars, and fasteners corrode measurably faster here than in Castro Valley or San Lorenzo just a few miles east. It’s common for us to replace flashing on a San Leandro roof where the shingles still have five to eight years left. Call (743) 200-8347 for an inspection.
We spec materials differently for low pitches. Architectural shingles are rated down to 2:12 with proper underlayment, but on 3:12 and lower we add ice and water shield in the valleys and any dead spots where water pools. We also check that the drip edge and starter strip are installed to manufacturer spec, because low-pitch roofs are less forgiving of sloppy edge work.
Often yes, but not always. We inspect the roof edges, flashing points, and attic decking for signs of layered roofs before quoting. In Washington Manor and Broadmoor, we quote multi-layer tear-off as a likely line item because we see it on nearly every block. We were called to a 1951 ranch in Washington Manor where the homeowner’s “new” roof was actually three layers of composition shingles over skip-sheathing, and the salt air had eaten the flashing around the vents down to rusty lace. Our crew stripped it all to the decking, added ice and water shield in the valleys, and installed GAF architectural shingles with a starter strip and ridge vent. The homeowner was shocked the tear-off added a full day and two dumpsters – but the quote had flagged that exact scenario upfront.
If you’re pricing a roof in San Leandro and want a straight answer, call (743) 200-8347. We’ll send a background-checked, photo-badged technician, put every number in writing, and stand behind the work for a full year. That’s the Threshold Standard – and it’s how Grant Whitlock runs Mercer Roofing.
Written by Grant Whitlock, Owner at Mercer Roofing, serving San Leandro since 2000.