Roofing
Full roof replacements and repairs with GAF-certified shingles and a 50-year warranty. Most jobs done in 3–5 days.
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CSLB #1078806 · Architect & General Contractor · Building Northern California homes since 2018
San Mateo County’s Top Design-Build & Exteriors Contractor
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Factory-certified by our manufacturer partners
What We Build 
Custom Home & Exterior Services in San Mateo County
Siding
James Hardie fiber cement siding that protects your home and looks great for decades. We handle dry rot repair and full replacements.
Windows
Energy-efficient window replacements that transform comfort and curb appeal. Double-hung, casement, bay, and more.
ADUs
Detached ADUs, garage conversions, and junior ADUs. Design, permits, and construction from start to finish.
Custom Homes
Ground-up custom home construction tailored to your vision. From foundation to finishing touches.
Additions
Seamless room additions that match your home’s existing style. We handle permits, design, and construction.
Building in San Mateo County: What Homeowners Need to Know
San Mateo County spans the Peninsula from the coastal communities of Pacifica and Half Moon Bay to the bayside cities of San Mateo, Burlingame, and Redwood City. The county’s proximity to the Pacific Ocean creates a marine-layer microclimate that demands careful material selection — persistent fog, salt air, and moisture accelerate deterioration on conventional roofing and siding materials faster than in inland Bay Area communities.
Coastal fog is particularly aggressive on the western side of the county. Homes in Pacifica, Moss Beach, and the hillside neighborhoods above Daly City experience near-constant moisture exposure from October through June. We recommend GAF Timberline HDZ shingles with StainGuard Plus for algae and moisture resistance in these areas, paired with James Hardie HZ5 fiber cement siding engineered specifically for high-moisture coastal environments. For the warmer, sunnier bayside cities like Redwood City and San Carlos, cool-roof-rated materials help offset the Peninsula’s rising summer temperatures.
Permit processes in San Mateo County vary by city. Redwood City and San Mateo both offer over-the-counter roofing permits for standard replacements, typically processed in 1–3 business days. Burlingame’s planning department may require design review for exterior changes in the Broadway and Burlingame Park neighborhoods. Daly City and South San Francisco follow streamlined permitting for residential roof and siding projects. ADU construction has surged across the Peninsula — San Mateo County’s pre-approved ADU plan program and California’s AB 68 provisions have made accessory dwellings a practical path for homeowners looking to add rental income or multi-generational living space.
Hamilton Exteriors has completed roofing, siding, window, and ADU projects throughout San Mateo County — from full exterior renovations on Burlingame Craftsman bungalows to roof replacements on Redwood City mid-century homes and new ADU construction in Daly City. Our crews understand the Peninsula’s building code nuances, HOA requirements in planned communities, and the access challenges that come with the county’s hillside lots and narrow driveways.
Rated 4.8 ★ from 39 Verified Northern California Homeowners
What Homeowners Say About Our Work
Real reviews from verified Northern California homeowners.
deborah maxey
in the last week
Great job and very professional the 1st photo is before and the other 2 is upon completion of work.
E
Eric W.
via Yelp
Hamilton Exteriors did an amazing job on my roof. The team was professional, and the quality of work was top-notch. Highly recommend!
R
Robert H.
via Angi
From the very first consultation, we knew we'd made the right choice. The team was knowledgeable and genuinely listened to our concerns about energy efficiency and design. We've already noticed a drop in our energy bills.
L
Laura G.
via Nextdoor
Hamilton Exteriors repaired extensive dry rot damage on our home's exterior. Their attention to detail and commitment to quality were evident throughout the project. Our home looks better than ever.
Our Advantage Why Choose
Why Choose
Hamilton Exteriors?
Transparent Pricing
Every estimate is itemized line by line — materials, labor, permits, cleanup. You see exactly where your money goes before we start.
Factory Trained Installers
Every crew member is manufacturer-certified and vetted — licensed, bonded, insured, and background-checked before they touch your home.
50-Year Warranty
50-year manufacturer warranty backed by our own workmanship guarantee for the full duration. If anything fails, we fix it — free.
Your Own Project Manager
One dedicated point of contact from first call to final walkthrough. You’ll always know who to reach.
Frequently Asked Questions
Didn't find the answer to your question? Call Now (650) 977-3351
What areas do you serve?
We serve Northern California across three regions: the San Francisco Bay Area (six counties from Alameda to Santa Clara), Greater Sacramento (Sacramento out to Roseville, Folsom, and Davis), and the Central Valley (Stockton to Modesto). Our crews are based in Castro Valley. We handle permits and know the building codes for each jurisdiction, which matters because requirements and fees vary significantly between cities.
How does billing and financing work?
We offer $0-down financing with approved credit, 12-month same-as-cash plans, and extended terms up to 15 years for larger projects. You only pay for completed, inspected work — we never ask for full payment before the job is done. Your project manager will walk you through every option during your estimate appointment. We also accept checks, ACH, and all major credit cards.
Are you licensed and insured?
Yes. CSLB License #1078806 — verify it anytime at cslb.ca.gov. We carry $2M general liability, full workers’ comp, and are bonded per California law. We hold GAF Master Elite, Owens Corning Preferred, CertainTeed ShingleMaster, and James Hardie Elite Preferred certifications — each requires annual training and quality audits to maintain. We’re happy to provide proof of insurance before any work begins.
Do I need a permit for my exterior project?
Most exterior projects in Northern California require a building permit. Fees vary by city — Oakland runs $200–$600, Peninsula cities often more. We handle the entire permit process: application, plan submission, and scheduling inspections. Permit fees appear as a separate line item in your estimate so you’ll see every cost upfront. For homes in WUI fire zones (Berkeley Hills, Oakland Hills, parts of Marin), we ensure full compliance with local fire-rated material requirements.
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21634 Redwood Rd Unit F, Castro Valley, CA 94546
Serving Oakland, Berkeley, Fremont, San Jose, Palo Alto, Walnut Creek, San Rafael, Napa, Redwood City & more across Alameda, Contra Costa, Marin, Napa, San Mateo & Santa Clara counties. All 47 cities →