Roof Installation in Alhambra - Free Inspection, Itemized Written Quote

Fast, Reliable Roof Installation Across Alhambra

Roof installation in Alhambra typically costs between $9,800 and $24,000 depending on the material, the condition of the decking beneath, and whether we’re dealing with original clay tile or composition shingle. On Alhambra’s pre-war Spanish Colonial Revival blocks, a single dislodged clay tile is almost never a one-tile problem. The 1920s felt underlayment beneath the field has usually disintegrated, so probing adjacent courses often converts a repair call into a full underlayment replacement across 15 to 20 squares. We’ve been doing this work in Alhambra long enough to know what hides under old tile. Grant Whitlock leads our Alhambra crews, and he’ll tell you the same thing: the street view looks fine, but the roof is only as good as what’s under it. Call (743) 200-8347 for a written estimate before any work begins.

Call (743) 200-8347

Why Mercer Roofing Is Alhambra’s Preferred Roof Installation Company

Alhambra homeowners call us because we send the technician’s name and photo before they arrive. The person at your door is background-checked, identity-verified, and badged under the Threshold Verified standard. No strangers. No surprises. Every visit starts with a knock, a photo ID, and a written price before a single nail is driven.

We work on the housing stock that defines Alhambra: Spanish Colonial Revival homes along North Almansor Street, Craftsman bungalows around Emery Park, and postwar stucco tract houses south of Valley Boulevard. Each one ages differently. Our crews know that a tile roof on a 1920s home on North Marengo Avenue needs different treatment than a comp shingle roof on a 1950s house near Alhambra Park. That local knowledge means fewer misdiagnosed problems and fewer change orders.

Mercer Roofing is part of the Threshold Group family, founded in 2000. Every job includes the 365-Day Done Right Promise: if the work isn’t right within a year, we make it right. Written guarantee on every repair, included with every job. A live person answers our phone 24/7. Not a voicemail. Not a callback form. A human being.

TPO Roofing Installation in Alhambra

TPO Roofing Installation in Alhambra runs $7 – $11 per square foot installed on the flat and low-slope additions we see behind so many Craftsman bungalows and Spanish Revival homes here. TPO is a single-ply thermoplastic membrane, heat-welded at the seams. It’s what we recommend for the flat rear additions, detached garages, and sunroom roofs common across Alhambra’s older lots. Homeowners on streets like South Granada Avenue and East Main Street ask for TPO when they’re tired of patching built-up roofing that’s seen three decades of San Gabriel Valley sun. A TPO install on a typical 400 – 600 square foot rear addition in Alhambra lands between $2,800 and $6,600, including tear-off, new insulation board, and membrane.

When TPO Is the Right Call

Flat and low-slope roofs in Alhambra bake in the same inland heat that ages shingles. TPO’s white reflective surface cuts that heat load significantly, which matters when the roof sits directly above a bedroom or kitchen. The membrane resists UV degradation better than older built-up systems.

What Installation Involves

We remove the old roof to inspect decking, replace any rotted sections, lay down new insulation board, then heat-weld the TPO membrane in one continuous sheet. Seams are welded, not glued. That’s the difference between a roof that holds through an atmospheric river and one that opens at the first winter storm.

Shingle Roof in Alhambra

A Shingle Roof installation in Alhambra typically runs $5.50 – $8.50 per square foot for architectural composition shingles, installed, including tear-off and new underlayment. On a 1,500 square foot home, that’s roughly $8,250 – $12,750. The Craftsman bungalows near Emery Park and the postwar homes south of Main Street are where we do most of our shingle work. These roofs take the full force of Alhambra’s inland UV load, which bakes granules off composition shingles faster than homeowners expect. We install GAF, CertainTeed, and Atlas shingles, and we give you a written price before any work starts.

Underlayment Matters More Than the Shingle

The shingle is what you see. The underlayment is what actually keeps water out. Alhambra’s heat dries out cheap asphalt felt within 10 to 15 years, long before the shingle itself fails. We specify high-temp self-adhered underlayment on every Alhambra shingle job because the inland San Gabriel Valley heat is simply harder on roofs than westside LA.

Decking and Dry Rot

On Alhambra homes built before 1950, we regularly find sections of decking rotted from decades of slow leaks. We replace damaged decking as part of the written estimate, not as a surprise add-on. You’ll know the full price before we start.

Trusted Brands We Service in Alhambra

We install and repair roofs using manufacturer-recognized brands including GAF, Atlas, Tamko, and Boral. For Alhambra’s Spanish Revival clay tile homes, Boral tile matches the original profiles closely enough that patched sections blend with the 100-year-old field. For the bungalows and postwar comp roofs, GAF and Atlas architectural shingles hold up against San Gabriel Valley UV better than three-tab. We keep common flashing profiles, tile hooks, and underlayment in our Los Angeles warehouse with fast delivery to Alhambra, so turnaround on standard materials stays short. If you have a preferred brand, tell us when you call and we’ll quote it.

Common Roof Installation Problems We See in Alhambra Homes

• Disintegrated felt under original clay tile. On Alhambra’s pre-war Spanish Revival blocks, the 1920s felt underlayment has turned to dust under entire tile fields. The tile on top still looks fine from the street, so water damage appears before the roof itself looks worn.
• Santa Ana wind damage to individual tiles. Every October through December, wind events shear clay tiles off pre-war Spanish Revival roofs across Alhambra, exposing the failed underlayment underneath. A few tiles in the yard is the symptom; rotted felt across 20 squares is the problem.
• UV-baked shingle granules on Craftsman bungalows. Alhambra sits inland and gets significantly more heat loading than coastal LA. Composition shingles on our older bungalows fry their granules off decades early, leaving bare mat exposed to the sun.
• Poorly flashed rear additions. The flat and low-slope additions behind Alhambra’s Craftsman homes were often built with minimal flashing where the addition roof meets the main house. That intersection leaks constantly, and the fix requires opening the wall-to-roof junction and reflashing it properly.

Pricing for Roof Installation in Alhambra, CA

We Also Serve Cities Near Alhambra

Mercer Roofing handles Roof Installation across the western San Gabriel Valley. Beyond Alhambra, we regularly work in South Pasadena, San Marino, Monterey Park, and San Gabriel. Each city has its own housing mix, but the same Threshold Verified standard applies: background-checked, photo-badged, uniformed technicians on every visit.

FAQs About Roof Installation in Alhambra