Free roof inspection with deck photos before we talk money - GAF and Owens Corning certified installation
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AfterFast, Reliable Roofing Company Across Hillsborough
Most roof replacements in Hillsborough run $1,750 – $2,900 per square for clay tile work, while full re-roofs on the large estates between Black Mountain Road and the Burlingame border typically land between $38,000 and $90,000 depending on tile profile and underlayment condition. Our Roofing Company team knows Hillsborough’s approval process cold: we file the Architectural Review Board submittal with material sample boards, coordinate salvage tile sourcing, and never tear off a single tile before the permit clears. Call (743) 200-8347 and a real person answers, day or night.
Why Mercer Roofing Is Hillsborough’s Preferred Roofing Company Company
Homeowners in Hillsborough call Mercer Roofing because we treat the front door like a security checkpoint. Before any technician sets foot on your driveway, you receive their name and photo. They arrive in a clean, marked uniform and hand you a photo ID badge at the door. That is the Threshold Standard, and every independently owned Mercer location is held to it contractually.
Grant Whitlock leads our team with one rule: written price before any work starts, written guarantee on every repair. No exceptions. Founded in 2000 and part of the Threshold Group family of home-service companies, Mercer Roofing has earned a reputation in Hillsborough for handling the town’s hardest roofing problems: discontinued clay tile profiles, failed underlayment on 1920s Mediterranean estates, fog-driven moss on north-facing slopes. We dispatch from our San Francisco Bay Area office, and crews scheduled for Hillsborough arrive familiar with the ARB’s paperwork rhythm.
Residential Roofing in Hillsborough
Residential Roofing in Hillsborough is dominated by clay tile and slate on custom estates built between the 1920s and 1960s, and that changes everything about how a job is priced and sequenced. A standard asphalt re-roof does not apply here. These roofs frequently arrive at a “tile-off” scenario: the original clay remains structurally sound while the felt underlayment beneath has rotted completely. The right fix is careful tile removal, sorting, new underlayment and flashing, then reinstallation of the original tile. We do this work routinely, and it costs substantially less than a full replacement while preserving what the ARB requires.
Full roof replacement in Hillsborough runs $38,000 – $90,000 depending on square footage, tile profile, decking condition, and whether original material can be reinstalled. Roof repair on these estates typically lands between $900 and $4,500 for flashing, ridge cap, or isolated tile replacement.
Tile-Off and Re-Installation
When original S-mission or barrel-roll tile is still sound, we remove it in sections, label and stack it, replace the failed underlayment, and reinstall tile exactly where it came from. This preserves the original profile and color the ARB expects. The alternative – ripping everything off and installing new tile in a “close enough” profile – gets rejected.
Full Replacement With ARB-Compliant Materials
If the tile itself is beyond saving, we source matching salvage from Bay Area demolition yards or work with manufacturers like GAF, CertainTeed, and IKO for approved replacement profiles. The ARB submittal includes a material sample board and photos of the original tile. We build that packet for you and file it before the roof is opened.
Roof Maintenance in Hillsborough
Roof Maintenance in Hillsborough is not optional – it is calendar-driven. The town’s hillside elevation pulls fog and winter rain up from the Peninsula floor, and that moisture sits on north- and west-facing clay tile long after flatland neighbors have dried out. Moss and lichen colonize those surfaces, and the repeated wet-dry cycle of Bay Area seasons stresses the mortar hip-and-ridge caps that cap nearly every Mediterranean roof in town. We recommend an annual inspection, and maintenance work on Hillsborough estates typically runs $450 – $1,500 per visit depending on scope.
Hip-and-Ridge Cap Repair
Mortar caps crack. Water gets in. The first sign is often a brown stain on a ceiling near an exterior wall. We re-bed and re-point caps using mortar blends matched to the original, and we reinforce with sealant where the ARB permits. This is the most common $600 – $1,200 repair we perform in Hillsborough.
Moss Removal and Underlayment Checks
Concrete and clay tile hold moisture. When moss builds up, it acts like a sponge. We clear it without pressure washing – which can blast the surface off old tile – then check the underlayment beneath for soft spots. Written report included, with photos, every time.
Trusted Brands We Service in Hillsborough
Mercer Roofing installs and repairs manufacturer-recognized shingle and tile systems from GAF, CertainTeed, Owens Corning, IKO, Atlas, Tamko, and Boral. For Hillsborough specifically, we stock the flashing, ridge cap, and fasteners most often needed on 1920s – 1950s clay tile and slate roofs, which means fewer supply runs mid-job. When a replacement shingle or tile course is called for, we work with these brands because their warranties survive a Hillsborough fog season intact. Fast turnaround for Hillsborough customers is a scheduling priority, not a promise we make lightly.
Common Roofing Company Problems We See in Hillsborough Homes
- Failed underlayment beneath sound clay tile. The original 80-year-old felt has broken down while the tile above still looks fine. We see this on nearly half the 1920s – 1940s estates we inspect, and the fix is a tile-off re-felt, not a full replacement.
- ARB rejection due to substitute tile profiles. Contractors who order new S-mission tile in a standard profile instead of sourcing salvage get bounced by Architectural Review. The delay costs weeks, and the homeowner pays for redesign.
- Mortar hip-and-ridge failure from thermal cycling. Fog-wet winters followed by dry 80-degree summers expand and contract mortar until it cracks. Water follows the crack into the roof deck. We re-bed caps every year.
- Moss and lichen on north-facing tile slopes. Hillsborough’s elevation keeps these surfaces damp for months. Moss holds moisture against the tile and accelerates spalling. We treat it as maintenance, not an afterthought.
Pricing for Roofing Company in Hillsborough, CA
A typical roof repair in Hillsborough runs $900 – $4,500. Full tile-off re-felt and reinstallation of original clay tile on a 3,000-square-foot estate generally lands between $18,000 and $35,000. Full replacement with ARB-compliant material runs $38,000 – $90,000. What moves the number: square footage, tile profile availability (salvage costs more than new), decking condition, and the number of penetrations (skylights, chimneys, plumbing vents). Every estimate is a written line-item price. No work starts until you have signed it. Call (743) 200-8347 to schedule your free estimate.
We Also Serve Cities Near Hillsborough
Hillsborough sits between San Mateo and Burlingame, and our crews serve clients from Los Angeles to San Diego, San Jose, and San Francisco. If your property is outside Hillsborough but near the Peninsula, ask about scheduling. For full details on our service area and the Threshold Standard, see our Roofing Company coverage, and for Hillsborough-specific permitting and review guidance, see Roofing Company in Hillsborough.
Serving Hillsborough, CA - Our Local Coverage Area
We’re based in the Hillsborough 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 Roofing Company in Hillsborough
Yes, any exterior roof alteration on the city’s predominant 1920s – 1950s Spanish Colonial Revival and Mediterranean estates must go through Hillsborough’s Architectural Review Board. The submittal needs a material sample board, photos of the original tile profile and color, and a written description of the proposed work. Mercer Roofing builds the packet, files it, and handles the review calendar. Call (743) 200-8347 for specifics about your property.
We source matching salvage S-mission and barrel-roll tiles from demolition yards across the Bay Area. Many original Hillsborough tile profiles from the 1920s – 1940s are no longer manufactured, so matching salvage is the only way to satisfy the ARB’s color-and-profile consistency rule. This step adds weeks to the timeline, but it is the difference between passing review and getting bounced. Call (743) 200-8347 and we will tell you whether your tile profile is still in production.
We sequence the job so the roof is never opened before the permit clears. The ARB review typically runs 4 – 8 weeks depending on submittal completeness. We file the packet, wait for approval, order salvage tile if needed, and only then schedule tear-off. No part of your roof sits exposed to Hillsborough’s fog-driven rain while a committee deliberates. Call (743) 200-8347 for a timeline on your property.
Because fog-wet winters followed by dry Bay Area summers create repeated thermal and moisture cycling that stresses mortar caps until they crack. Water follows the crack into the roof deck and sometimes into the house. We see this failure on a large share of older Hillsborough estates. Re-bedding and re-pointing those caps is a $600 – $1,200 repair, and it is far cheaper than replacing rotted decking. Call (743) 200-8347 for an inspection.
Generally no, not on the 1920s – 1950s Spanish Colonial Revival, Mediterranean, and Tudor homes that define Hillsborough’s housing stock. The ARB enforces material-consistency standards that keep original clay tile and slate as the default. Exceptions are rare and require documented evidence that the original material cannot be restored. A written price for either path comes before any work starts. Call (743) 200-8347 to discuss yours.
Written by Grant Whitlock, Owner at Mercer Roofing, serving Hillsborough and the greater Peninsula with the Threshold Verified standard since 2000.