Free roof inspection with deck photos before we talk money - GAF and Owens Corning certified installation
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Before
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Before
AfterFast, Reliable Roof Installation Across Campbell
A full roof installation in Campbell typically runs between $14,000 and $28,000 for a standard single-story ranch, depending on decking condition, roof pitch, and shingle grade. Most Campbell jobs take four to eight working days from tear-off to final inspection. If you live in the neighborhoods between Winchester Boulevard and the Los Gatos Creek Trail, you already know the moisture problem: roofs here stay wetter longer than in Sunnyvale or Santa Clara, and that changes how a roof has to be built. Call (743) 200-8347 and we’ll give you a written price before a single nail goes in.
Why Mercer Roofing Is Campbell’s Preferred Roof Installation Company
Campbell homeowners call us because of what’s under the shingles, not just the shingles themselves. The ranch homes concentrated between Hamilton Avenue, San Tomas Expressway, and Highway 17 were mostly built from 1950 to 1975, and their low-slope roofs (3:12 to 4:12 pitch) trap moisture against the decking for months at a time. We’re the roof installation team that opens the deck and tells you what’s actually there before pricing a re-roof. That’s why our written quotes in Campbell routinely include decking replacement figures that other bids bury or skip entirely.
Grant Whitlock, who leads Mercer Roofing, made the rule that no crew starts a Campbell job without a written price in the homeowner’s hand. That’s not a courtesy; it’s the only way to do honest work on roofs this old and this prone to hidden substrate damage. And because we know who’s coming to your door matters as much as the work itself, every technician shows up in uniform with a photo ID badge, and we send you their name and photo before they arrive. That’s the Threshold Verified standard, and it’s contractually required across every Mercer location.
When Campbell residents from the Pruneyard area to the San Tomas neighborhood call us, a live person answers, 24/7. Our crews work Campbell regularly, and we stock the flashing sizes, ice and water shield rolls, and low-slope-rated underlayment our local jobs actually need. A roof installation in Campbell has to be specified for Campbell’s wet microclimate or it will fail early. That’s the local knowledge we build into every estimate.
TPO Roofing Installation in Campbell
TPO Roofing Installation in Campbell is the right call for flat and very low-slope sections on ranch additions, carports, and patio covers, where shingles can’t drain properly and the area stays damp for months after each winter rain. In Campbell, a TPO installation typically runs $9 to $13 per square foot installed, including membrane, insulation board where needed, and new edge metal. That’s for a mechanically attached or fully adhered TPO system rated for our wet winters, not the thinner economy membranes that fail at the seams within a decade.
Where TPO fits on Campbell homes
We see plenty of Campbell ranches with a shingled main roof and a flat section over a back addition or enclosed patio. The flat part is always the first failure point, because the 1×6 skip-sheathing under it soaks up what the low slope can’t shed. We specify TPO there, fully adhered, with a white reflective surface that also helps during our hot summer afternoons off the Santa Cruz Mountain foothills.
What TPO replacement actually costs here
The honest number for a typical 400-square-foot flat section in Campbell is $3,600 to $5,200, and that goes up if we have to cut out saturated decking first. On the older ranches between Rincon Avenue and Dell Avenue, the substrate under a flat roof is often soft and needs replacement before membrane goes down. If someone quotes half that price, ask what membrane thickness and seam detail they’re actually including. A cheap TPO job in this climate is a leak waiting one atmospheric river to happen.
Shingle Roof in Campbell
A Shingle Roof in Campbell is the standard choice for the 3:12 to 4:12 pitched ranch homes that dominate the housing stock, and a full tear-off and re-shingle here typically runs $14,000 to $26,000 for a 1,200- to 1,800-square-foot home. The number that moves most in Campbell is decking replacement, because the wet microclimate funneled through the Los Gatos Creek corridor saturates old 1×6 skip-sheathing and early plywood far more often than in drier neighboring cities. We write that line item into the estimate up front.
Why low-slope ranch roofs need a different spec
On a 3:12 roof, water moves slowly. That’s the whole story. Slow water finds every seam, every nail hole, every softened felt section, and it sits there through our wet winters. On a recent 1968 ranch off Rincon Avenue, our crew tore off two layers of shingles, replaced fourteen squares of saturated decking, laid ice and water shield through the valleys and along the eaves, and then set GAF architectural shingles on a rebuilt ridge. The shingles were never the problem. The substrate was.
What we install on Campbell’s shingle roofs
We install and honor manufacturer-recognized shingle brands including GAF, CertainTeed, IKO, Atlas, and Tamko, matched to the pitch and exposure of each section. Every shingle job starts with a written price that includes the full material spec, so you can compare bids line by line. The 365-Day Done Right Promise applies to the entire installation, not just the shingles: if the work isn’t done right within a year, Mercer makes it right.
Trusted Brands We Service in Campbell
We install GAF, Atlas, and Tamko shingles in Campbell most often, and we stock the common flashing sizes and ridge vent profiles for those lines so we’re not waiting on a supplier mid-job. GAF architectural shingles are what we recommend most on Campbell’s low-slope ranches, because they handle slow-draining roofs better than three-tab and carry long material warranties we can register for you. Written into every quote is the exact material list, so you know which brand and grade you’re paying for before we start.
Common Roof Installation Problems We See in Campbell Homes
- Moss and algae colonizing north- and west-facing planes. The Los Gatos Creek corridor pushes marine moisture inland and Campbell roofs stay wetter than Sunnyvale or Santa Clara roofs just a few miles north. We remediate the moss, then lay a moisture-rated underlayment so it doesn’t return through the deck.
- Saturated, delaminated decking found only after tear-off. On homes built 1950 to 1975 with original 1×6 skip-sheathing, the low pitch traps winter moisture against the deck for months. That’s why our Campbell quotes include a written decking-replacement line item, not a surprise change order.
- Flashing and valley failures during atmospheric river events. Concentrated winter rain overwhelms low-slope drainage on these aging ranch roofs and exposes every weakened valley, sidewall, and chimney flashing instantly. We spec wider valley metal and ice and water shield through valleys and eaves so the roof is built for the worst week of the year.
- Early plywood decking that’s soft under the felt. We routinely find plywood decking that looks solid from the attic but crumbles under a pry bar once the shingles are off. Our crews show you the damage, point by point, before any replacement board goes in, and the price gets set in writing before that work starts.
Pricing for Roof Installation in Campbell, CA
The honest range for a full roof installation in Campbell is $14,000 to $28,000 for a standard 1,200- to 1,800-square-foot ranch. TPO sections run $9 to $13 per square foot. What changes the number here more than anything is decking: on a 1960s home with original skip-sheathing, expect $2 to $4 per square foot extra for replacement boards, and on a wet lot near the creek corridor, that line item is common, not rare. You’ll get a written, line-by-line estimate before any work starts, and that price doesn’t change once we’re on the roof. No change orders, no discovered-problem add-ons. If it’s not right within 365 days, we make it right. Call (743) 200-8347 and ask for the Campbell-specific material spec.
We Also Serve Cities Near Campbell
Our Roof Installation team works Campbell’s surrounding communities regularly, bringing the same Threshold Verified vetting and honest substrate pricing to Saratoga, Los Gatos, Santa Clara, and Cupertino. Saratoga’s hillside homes have different drainage issues than Campbell’s ranches, but the fixed written price and the badge-at-the-door promise don’t change. If you’re in any of those areas, call (743) 200-8347 and we’ll send the same local crew we trust in Campbell.
Serving Campbell, CA - Our Local Coverage Area
We’re based in the Campbell 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 Campbell
Campbell roofs sit in a wetter microclimate than Sunnyvale or Santa Clara, because the Los Gatos Creek corridor funnels marine moisture off the Santa Cruz Mountains and traps it against the low-slope roofs on our 1950s – 70s ranch stock. The result is more decking replacement, more moss remediation, and a real need for ice and water shield through valleys and eaves, all of which add legitimate material and labor costs. A Campbell quote that doesn’t include those line items is underpricing the job. Call (743) 200-8347 and we’ll walk you through exactly where the money goes.
If the decking is saturated, delaminated, or soft under the felt, it must come out, because new shingles nailed into rotten wood won’t hold, and the failure will be worse than what you’re replacing now. On Campbell’s 1950s and 60s ranches, we frequently find original 1×6 skip-sheathing that’s too far gone to reuse, and we show you every damaged board before we cut it. Code also requires solid, clean nailable decking under any new shingle roof. A roofer who says “we can shingle over it” without looking at the deck is not doing you a favor. Call (743) 200-8347 and we’ll inspect the deck before pricing anything.
For Campbell’s low-slope ranch roofs, we spec ice and water shield through all valleys and along the eaves, a synthetic moisture-rated underlayment on the field, and wider valley metal than the standard 24-inch, because our wet winters overwhelm narrower flashing. On pitches at or below 4:12, we also install a low-slope-rated underlayment that seals around fasteners, which matters when water sits on the roof for days after an atmospheric river event. Flashing is replaced, never reused, at every penetration, roof-to-wall joint, and valley. The material spec is written into your estimate, line by line. Call (743) 200-8347 for the exact spec for your roof.
We install GAF, CertainTeed, IKO, Atlas, and Tamko shingles in Campbell, matched to your roof’s pitch and exposure. For most Campbell ranches we recommend GAF architectural shingles, because their nail strip and wind rating hold up well on low-slope roofs that drain slowly through wet winters. Every quote names the specific brand, grade, and color, and we register the manufacturer warranty for you when the job is complete. If you want to compare two shingle grades side by side for your own roof, call (743) 200-8347 and we’ll show you the difference in writing.
Put the two bids side by side and compare five specific line items: decking replacement allowance, underlayment type and grade, ice and water shield placement, flashing detail (are valleys widened and all penetrations replaced?), and the written warranty term. In Campbell, the bid with the honest decking allowance costs more up front and less over a decade, because the cheap bid is counting on your low-slope roof holding up without substrate work. If either bid won’t put those line items in writing before work starts, that’s your answer. Call (743) 200-8347 and we’ll send a written, comparable estimate for your roof.
Mercer Roofing serves Campbell with honest substrate pricing, fixed written estimates, and a 365-Day Done Right Promise on every installation. Call (743) 200-8347 today for a free inspection and a price in writing.
Written by Grant Whitlock, Owner at Mercer Roofing, serving Campbell, CA.