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
Santa Clara County’s Top Design-Build & Exteriors Contractor
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What We Build 
Custom Home & Exterior Services in Santa Clara 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 Santa Clara County: What Homeowners Need to Know
Santa Clara County is the Bay Area’s largest county by population, spanning the tech corridors of Mountain View and Sunnyvale, the historic neighborhoods of San Jose, and the upscale hillside communities of Saratoga and Los Gatos. With median home values exceeding $1.6 million countywide, homeowners expect premium materials and craftsmanship that protect their investment for decades.
The western foothills — including portions of Los Gatos, Saratoga, and the Monte Sereno area — fall within Wildland-Urban Interface (WUI) fire zones. The Santa Clara County Fire Department requires Class A fire-rated roofing, ember-resistant vents, and non-combustible exterior materials within defensible space zones. The 2020 SCU Lightning Complex fires reinforced these requirements, and Hamilton Exteriors maintains current certification in all WUI-compliant installation methods.
Permit processes across Santa Clara County are generally efficient. San Jose’s Department of Planning, Building and Code Enforcement offers express over-the-counter permits for straightforward roof replacements. Palo Alto’s Architectural Review Board may require design review for exterior changes on homes in designated historic districts, including Professorville and Crescent Park. Mountain View and Sunnyvale both support streamlined permitting for energy-efficiency upgrades including window replacements and cool-roof installations. ADU permits in San Jose benefit from the city’s adopted pre-approved plans, cutting approval time significantly.
Santa Clara County’s climate is warmer and sunnier than the coastal Bay Area, with inland cities like San Jose averaging 300+ days of sunshine annually. This UV exposure accelerates fading on field-painted siding — we recommend James Hardie ColorPlus factory-finished fiber cement for its 15-year color warranty and superior UV resistance. For roofing, tile remains popular on the county’s many Mediterranean and Spanish Colonial homes, particularly in Palo Alto and Los Gatos. Hamilton Exteriors has completed projects across the county — from tile roof restorations on Palo Alto Eichlers to full exterior renovations in the Cambrian neighborhood of San Jose and ADU construction in Campbell and Milpitas.
Service Locations in Santa Clara County
San Jose, CA
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Palo Alto, CA
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Mountain View, CA
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Sunnyvale, CA
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Cupertino, CA
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Santa Clara, CA
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Saratoga, CA
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Los Gatos, CA
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Campbell, CA
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Milpitas, CA
Explore Service Area → Top Cities We Serve
Cities and what makes each one different
San Jose
South Bay's largest city, online permit portal, hot summers favor cool-roof shingles and tile.
View San Jose services →Palo Alto
Strict Architectural Review Board for historic districts (Professorville, Crescent Park) — plan 4-6 extra weeks.
View Palo Alto services →Mountain View
Strict Title 24 enforcement; SRI 16+ cool-roof shingles required on most re-roofs.
View Mountain View services →Sunnyvale
Streamlined online permits in 5-7 days; many original 1950s-1970s low-pitch roofs need TPO, not shingles.
View Sunnyvale services →Cupertino
High-value market where premium architectural shingles deliver the best resale ROI.
View Cupertino services →Saratoga
Hillside WUI fire zones require Class A assemblies, ember-resistant vents and defensible space.
View Saratoga services →Los Gatos
Historic Preservation Zone in downtown — composite shake look-alikes are the standard approved upgrade.
View Los Gatos services →Milpitas
Closest South Bay city to our Castro Valley shop, online permits in about a week.
View Milpitas services → Permits and Compliance
Santa Clara County permit context
Permitting is generally efficient across Santa Clara County. San Jose's Department of Planning, Building and Code Enforcement runs an express over-the-counter track for like-for-like re-roofs, while Palo Alto's Architectural Review Board can add four to six weeks for projects in Professorville and Crescent Park historic districts. Mountain View and Sunnyvale both enforce Title 24 cool-roof requirements (SRI 16+) on most re-roofs, and the western foothills of Los Gatos and Saratoga sit in Cal Fire WUI zones requiring Class A roof assemblies, ember-resistant vents and defensible-space inspections. Hamilton Exteriors pulls every permit in your name, schedules inspections and handles WUI documentation as part of the project.
Rated 4.8 ★ from 39 Verified Northern California Homeowners
What Homeowners Say About Our Work
Real reviews from verified Northern California homeowners.
deborah maxey
a week ago
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 →