Free roof inspection with deck photos before we talk money - GAF and Owens Corning certified installation
Before
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AfterFast, Reliable Roof Installation Across San Mateo
Roof installation in San Mateo runs $14,000 – $28,000 for a standard composition shingle re-roof on a postwar ranch, and $28,000 – $55,000 for standing seam metal. Most jobs take 3 – 7 days once materials land. We work in San Mateo every week, and we know which roof planes here fail first. Call (743) 200-8347 to schedule a free estimate with a written price before any work starts.
Why Mercer Roofing Is San Mateo’s Preferred Roof Installation Company
We built our reputation in San Mateo by treating the fog as a design input, not an afterthought. Homeowners in Baywood, Aragon, and Hillsdale call us because we specify stainless-steel fasteners and zinc strips on re-roofs where other bidders quote the inland spec. Every technician who arrives at your door is background-checked, identity-verified, and badged under the Threshold Standard. You get their name and photo before they arrive.
Our Roof Installation team has torn off enough layers in San Mateo to know what hides under the shingles: rotted wood shake underlayment, corroded nails, moss colonies thicker than the granules they feed on. We put every price in writing before the first fastener goes in, and every installation carries our 365-Day Done Right Promise. If something isn’t right within a year, we make it right.
Key Takeaways
- Coastal-spec fasteners and zinc strips are standard on our San Mateo bids, not upsells.
- Written price before work starts, always. No change orders on the invoice.
- 365-Day Done Right Promise with a written guarantee on every installation.
- Live person answers the phone 24/7. A real human, not a voicemail tree.
Standing Seam Metal Roof in San Mateo
Standing seam metal roof work in San Mateo costs $28,000 – $55,000 on a typical ranch home, and it’s the single best answer to the fog corridor’s persistent dampness. The concealed fastener system means no exposed screws to corrode in salt-laden air, and the panel profile sheds moss far better than granular surfaces. For homes in the western ZIP codes near San Mateo Highlands, where north-facing planes stay wet nearly year-round, metal often outlives two composition roofs.
Panel Spec and Fasteners
We order 24-gauge steel panels with a Kynar finish, and we fasten them with stainless-steel clips made for marine exposure. Standard painted steel clips will fail inside 15 years here. The difference in material cost is maybe $400 – $700 on a full roof, and it buys three decades of not thinking about corrosion.
Why It Costs What It Does
Metal runs roughly double the price of architectural shingles because the labor is slower and the underlayment spec is stricter. We install high-temperature ice and water shield across the entire deck on metal jobs in San Mateo, not just at eaves and valleys. That one upgrade prevents the condensation staining that plagues cheaper metal installs in fog zones.
Tile Roof in San Mateo
Tile roof installation in San Mateo runs $30,000 – $60,000 depending on profile and underlayment scope, and it’s common on the Craftsman and vernacular Victorians near downtown where homeowners want the original look. Concrete and clay tile handle fog well, but the underlayment underneath is what fails first here. We strip everything to the deck and install a two-layer modified bitumen system rated for continuous damp exposure before the first tile goes down.
Underlayment Before Tile
On tile jobs in San Mateo we don’t shingle over old felt. The fog pushes moisture through porous underlayment within eight to ten years. A full tear-off with a modern high-temp membrane adds $3,000 – $6,000 to the job, and it’s the difference between a roof that lasts forty years and a tile job that leaks at year twelve.
Weight and Structural Check
Tile is heavy, and some 1950s ranch framing in Baywood and Hillsdale wasn’t designed for it. We check rafter spacing and deck condition before quoting tile. If the framing needs reinforcement, we say so in the written estimate, with a line-item price, before work begins.
Trusted Brands We Service in San Mateo
We install and repair roofs using manufacturer-recognized shingle lines from GAF, CertainTeed, and Owens Corning, and we work with standing seam panels from Atlas and Boral-approved fabricators. Because we’re in San Mateo weekly, we keep common flashing profiles, ridge caps, and zinc strips stocked for fast turnaround on local jobs. No waiting two weeks for a warranty-matched accessory that should have been on the first truck.
Common Roof Installation Problems We See in San Mateo Homes
- Corroded fasteners from salt-laden fog. Standard electro-galvanized nails fail in as little as 8 – 12 years near the San Bruno Mountain gap. We specify stainless or hot-dip galvanized on every San Mateo install, written into the estimate.
- Moss and lichen on north-facing planes. The marine layer keeps north slopes damp year-round, and moss can void a manufacturer warranty within a decade. Zinc strips and algae-resistant shingles are standard on our western San Mateo bids.
- Rotted original wood shake underlayment. In 1950s – 1970s ranch tracts, we often find original wood shakes buried under two or three layers of composition. The shake never dried out, and the deck underneath is mush. Full tear-off and redecking is the only honest fix.
- Low-slope leaks at eaves and valleys. Low-pitched ranch roofs (3:12 – 5:12) shed water slowly, and persistent dampness overwhelms standard felt. We add ice and water shield at every valley and eave on these homes, regardless of code minimum.
Pricing for Roof Installation in San Mateo, CA
Here’s what San Mateo homeowners should budget. A composition shingle re-roof on a 1,200 – 1,800 square foot ranch runs $14,000 – $28,000, with the coastal-spec fasteners and zinc strips adding $800 – $1,500 over an inland bid. Standing seam metal runs $28,000 – $55,000. Tile runs $30,000 – $60,000. The spread reflects deck replacement, roof pitch, number of layers torn off, and whether we’re reinforcing framing for heavier materials. Every Mercer bid includes the coastal-spec hardware as a line item, so you can compare it against a cheaper quote that skips it. Call (743) 200-8347 for an exact written quote. Estimates are free.
We Also Serve Cities Near San Mateo
Beyond Roof Installation in San Mateo, our crews work regularly in Burlingame, Belmont, Millbrae, and San Carlos. The fog and salt air don’t stop at the city line, and neither do the moisture management details we spec on every job.
Serving San Mateo, CA - Our Local Coverage Area
We’re based in the San Mateo 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 Mateo
Because San Mateo sits in the Peninsula fog corridor, and north-facing roof planes near San Mateo Highlands stay damp enough to grow moss heavy enough to void manufacturer warranties within 8 – 10 years. Zinc strips release ions when wet that block moss and lichen from establishing. In inland Peninsula cities like San Jose, biological growth is far slower, so the strips aren’t a standard line item there. Here, they’re cheap insurance against a warranty rejection. Call (743) 200-8347 and we’ll show you a written line-item cost for zinc on your exact roof.
Stainless steel or hot-dip galvanized fasteners, no exceptions. The salt-laden fog that pushes through the San Bruno Mountain gap corrodes standard electro-galvanized nails in under a decade, leading to shingle blow-offs and flashing failures. We write the fastener spec into every San Mateo estimate, with the brand and coating listed. If a bid doesn’t say what fasteners it uses, that’s your answer: it’s using the cheap inland spec. Call (743) 200-8347 for a written quote that names the hardware.
The coastal spec adds roughly $800 – $1,500 to a composition re-roof: stainless fasteners instead of electro-galvanized, zinc strips along ridges and hips, algae-resistant shingle granules, and ice and water shield extended past code minimum at eaves and valleys. The inland spec skips those, so the bid looks cheaper up front. But fasteners fail at year ten and moss voids the warranty at year eight. You pay for a second roof inside fifteen years. The coastal spec is the cheap version, once you do the math over a decade. Call (743) 200-8347 for an estimate that shows both specs side by side so you can decide with real numbers.
Most Baywood ranches sit between 3:12 and 5:12 pitch, which is the lower limit for standard architectural shingles. It can work, but you need ice and water shield at all eaves, valleys, and any pitch transitions, not just the first three feet code requires. Without that extended membrane, persistent fog-driven dampness works through standard felt and leaks at the slow spots. We also recommend zinc strips on these low-slope planes because water moves slowly and moss loves it. Call (743) 200-8347 and we’ll assess your exact slope and quote the membrane scope in writing.
We tear it out. Here’s what we actually see: in the Baywood neighborhood, we tore off a 1958 ranch’s third layer of composition shingles and found the original wood shake underlayment had rotted from years of fog-driven moisture. Nobody had ever removed it. We replaced the decking, added ice and water shield in the valleys, and installed CertainTeed architectural shingles with stainless-steel fasteners and zinc strips along the ridge. The homeowner now has a roof that should outlast the fog cycle that killed the previous three. Burying new shingles over rotted shake just repeats the cycle. Call (743) 200-8347 for a free estimate with an honest decking scope in writing.
Written by Grant Whitlock, Owner at Mercer Roofing, serving San Mateo and the surrounding Peninsula.