Free roof inspection with deck photos before we talk money - GAF and Owens Corning certified installation
Before
After
Before
After
Before
AfterFast, Reliable Roofing Company Across Glendora
Most roofing work in Glendora falls into two camps: the tract-home flatlands south of Foothill Boulevard, and the foothill acreage north of it where fire codes, wells, and septic systems change everything. Mercer Roofing handles both. We’ve re-roofed ranches off Sierra Madre Avenue, tile homes in the hills, and everything in between. Our Roofing Company team works exclusively in the San Gabriel Valley, so when you call (743) 200-8347, the person on the other end knows what a Glendora VHFHSZ inspection involves and why your ridge caps blew off last October.
Before a single nail is driven, you get a written price. Every repair carries a written 365-day guarantee. And every technician who arrives at your door has already sent you their name and photo, and will present a photo ID badge before stepping inside. That’s how we’ve operated since 2000, and it’s the only way we know how.
Why Mercer Roofing Is Glendora’s Preferred Roofing Company Company
Glendora homeowners ask us two questions more than any others: “Can you replace this without me standing in the permit line?” and “Who exactly is coming to my house?” Both are fair. On the first: we scope the fire-zone requirements before we quote, not after the permit counter rejects the application. On the second: every Mercer technician is background-checked, identity-verified, and dispatched under the Threshold Verified standard. You receive the name and photo of the person coming before they arrive. They show up in a clean, marked uniform with a photo ID badge. No surprises at the door. Ever.
Grant Whitlock leads our field teams across the San Gabriel Valley. He’s the one holding the crews to the Threshold Verified standard on every job in Glendora, from a straight re-shingle on a 1960s ranch to a full Class A assembly upgrade on a hillside custom. We answer the phone with a live person 24/7. Not a voicemail that says someone will call you back. A real human, at 2 a.m. if that’s when the Santa Ana winds rip a section of flashing loose.
Our pricing is written, line-item, and fixed before work starts. If a repair fails within 365 days, we come back and make it right at no charge. That’s the Done Right Promise, and it’s in writing on every job, not buried in fine print.
Roof Coating in Glendora
Roof Coating in Glendora is a practical choice for flat and low-slope roofs on the commercial structures, carriage houses, and older ranch additions that dot the city’s acreage parcels. A coating job here typically runs $2.50 to $5.50 per square foot depending on the existing surface condition, and it buys you additional years on a roof that’s structurally sound but weathered. On flat-roof sections over patios, detached garages, or original ranch wings, a silicone or elastomeric coating seals hairline cracks and reflects a meaningful share of the San Gabriel Valley’s summer sun.
When Coating Makes Sense on Glendora Acreage
If your flat roof isn’t leaking but the surface is chalking, blistered, or ponding after rain, coating often saves you a full tear-off. We prep the surface, repair seams and flashing, then apply the coating in two passes so the finished membrane sheds water cleanly. On acreage lots where roof runoff flows toward leach fields, we also check downspout discharge as part of the scope, because a coated roof still moves water somewhere.
What Coating Won’t Fix
Coating is not a structural repair. If the decking beneath is rotted, or the roof is already sagging at the drain points, a coating just hides the problem. We tell you that before we coat it. Written quote first, honest assessment included.
Free Roof Estimate in Glendora
A Free Roof Estimate in Glendora from Mercer means we walk the property, inspect the roof and the surrounding site conditions, and hand you a written line-item price before any commitment. For foothill acreage, that estimate has to account for things a flatland quote never considers: septic setbacks, wellhead locations, fire-zone decking requirements, and where a dumpster can actually sit. We include all of it. Call (743) 200-8347 to schedule yours.
What We Check During the Estimate
We look at the existing roof surface, the decking from below where accessible, the flashing at ridges, valleys, and chimneys, and the pitch and drainage pattern. On acreage, we also map where the leach field and wellhead sit relative to the roof edges, because re-routing downspouts after the fact costs time and money that should have been in the first number.
Written Price, Fixed in Advance
The price we write is the price you pay. No change orders because we under-bid the material haul. No surprise upcharge when the permit office flags the fire-zone requirement. We identify those scope items before we quote, which is what makes the estimate genuinely free of risk for you.
Trusted Brands We Service in Glendora
We install and repair shingle and tile systems from GAF, CertainTeed, Boral, and Owens Corning, and we stock the common valley flashing, ridge cap, and underlayment materials for quick turnaround on Glendora roofs. For foothill properties inside the VHFHSZ, Boral concrete tile and Class A-rated asphalt systems from GAF and Owens Corning are the workhorses, because they meet the fire-code assembly requirements without forcing a full redesign. We match existing profiles where possible, so a partial repair on a 20-year-old tile roof doesn’t look like a patch job. Manufacturer warranties apply, and our own 365-day workmanship guarantee runs on top of that, not instead of it.
Common Roofing Company Problems We See in Glendora Homes
- Ridge cap blow-offs from Santa Ana winds. The foothill corridor funnels wind straight down the canyons each fall, and the first thing to fail is almost always the ridge cap. We see it on flatland ranches and hillside customs alike, and the fix is mechanical fastening plus adhesive, not just more nails in the same old holes.
- Wood shake roofs stopped at the permit counter. Glendora enforces the VHFHSZ rule that prohibits replacing shake with like material north of Foothill. Homeowners budget for a straight swap, then find out they need a full Class A assembly. We scope that from day one so the quote already reflects reality.
- Dry-rotted decking on south and west exposures. The San Gabriel Valley sun bakes the south-facing slopes of older ranches, and water that gets under worn shingles does the rest. We routinely replace decking sections during re-roofs, especially on 1950s and 1960s builds where the original sheathing was never rated for this climate.
- Downspouts dumping onto leach fields. On acreage lots with private septic, we regularly find downspouts terminating right over the drainfield. The first big rain pondsover the field, the system backs up, and the homeowner has a drainage problem they didn’t have before. We re-pitch the runs away from the field as part of the re-roof scope.
Pricing for Roofing Company in Glendora, CA
An asphalt shingle re-roof on a standard Glendora ranch runs $14,000 to $24,000, depending on tear-off requirements, decking replacement, and whether the property falls inside the VHFHSZ Class A assembly requirement. Hillside tile homes with steeper pitches and complex flashing typically land between $28,000 and $55,000. Flat-roof coating work runs $2.50 to $5.50 per square foot. The big variables here are fire-zone compliance, decking condition, material haul distance, and whether a dumpster can sit near the structure. We lay every one of those numbers out in the written estimate so there’s no second conversation about what things “really” cost. Call (743) 200-8347 to schedule a free estimate.
We Also Serve Cities Near Glendora
Mercer Roofing handles roofing work across the eastern San Gabriel Valley, including Azusa, San Dimas, Covina, and La Verne. If your property sits in one of those cities but has the same foothill or acreage characteristics we see in Roofing Company in Glendora, the same written-price, fire-zone-scoped estimate process applies. Dispatch and scheduling are coordinated from our Los Angeles office; crews serve Glendora and neighboring cities locally.
Serving Glendora, CA - Our Local Coverage Area
We’re based in the Glendora 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 Glendora
If your property is inside the Glendora city limits, a re-roof requires a city of Glendora building permit, even if you’re on acreage with a well and septic system. The city’s permit process for properties inside the VHFHSZ also triggers the Class A fire-rated assembly review, which means the materials and underlayment combination have to meet the California Building Code fire standard before the permit is issued. Call (743) 200-8347 and we’ll check your parcel and tell you exactly which path applies before you spend a dollar.
No, not if your home sits inside the designated Very High Fire Hazard Severity Zone north of Foothill Boulevard. Glendora enforces the VHFHSZ rule that prohibits replacing wood shake with like material, so a shake-to-shake swap is not a permitted scope. You can keep an existing shake roof until it needs replacement, but once you re-roof, the new assembly must meet Class A fire-rating standards, which typically means a tile, metal, or Class A-rated asphalt system with the required underlayment. We factor that into every Glendora foothill quote.
Roof drainage and downspout discharge must be directed away from your leach field and wellhead, not just toward a city storm drain. We map both features during the estimate and scope the downspout runs so winter runoff doesn’t pond over the drainfield or wash contaminants toward the well. On one 1970s ranch off Sierra Madre Avenue, we re-pitched two downspout runs during a re-roof specifically because the original routing sent every winter storm’s worth of runoff straight over the leach field. That’s the kind of thing a flatland roof quote never catches.
The San Gabriel Mountain foothill corridor funnels and amplifies Santa Ana wind events, and ridge caps and flashing at the eaves and valleys take the brunt of that uplift each October and November. It’s not poor installation; it’s geography. The fix is mechanical fastening with adhesive, plus field inspections of adjacent tiles or shingles, so one lifted cap doesn’t turn into a season-long leak. Call (743) 200-8347 after a wind event and we’ll get a crew out to assess it before the next storm.
Each structure gets its own line item: square footage, pitch, decking condition, and fire-zone compliance assessed separately for the main house, the detached garage, the shop, and any ADU. Material haul and staging time across a long driveway or open lot get added as a single shared cost, not multiplied per structure. We write it all out in the estimate so you can see exactly what each building costs and make informed choices about what to re-roof now and what can wait.
Get Your Written Glendora Roof Estimate
You should know exactly who’s coming to your door and exactly what the work will cost before you commit to anything. Call (743) 200-8347 to schedule your free estimate. We’ll send the technician’s name and photo before they arrive, they’ll badge in at the door, and you’ll have a written line-item price in hand before any work begins.
Written by Grant Whitlock, Owner at Mercer Roofing, serving Glendora and the San Gabriel Valley.