CSLB #1078806 · Architect & General Contractor · Building Northern California homes since 2018
Serving Northern California From the Bay Area to Sacramento
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Factory-certified by our manufacturer partners
3
Regions Served
500+
Projects Completed
50-Year
Warranty Coverage
4.8
Google Rating
Service Areas
From the Bay Area to Sacramento. One Standard.
Licensed, bonded, and insured across Northern California: the San Francisco Bay Area, Greater Sacramento, and the Central Valley. Find your Bay Area county below to see what we're building near you.
We operate from Castro Valley, CA (Alameda County) and serve homeowners across the Bay Area (Alameda, Contra Costa, Marin, Napa, San Mateo, and Santa Clara counties), Greater Sacramento (Sacramento, Roseville, Rocklin, Folsom, Elk Grove, Davis, and Auburn), and the Central Valley (Stockton, Lodi, Manteca, Tracy, and Modesto). We do not serve Hamilton, Ontario or areas outside Northern California.
Alameda County, CA
Oakland · Fremont · Hayward · Berkeley · San Leandro · Dublin · Pleasanton · Livermore · Union City · Alameda · Castro Valley
Contra Costa County, CA
Antioch · Walnut Creek · Concord · San Ramon · Richmond · Lafayette · Orinda · Danville · Brentwood · Pittsburg
Napa County, CA
Napa · American Canyon · St. Helena · Calistoga · Yountville
Santa Clara County, CA
San Jose · Palo Alto · Mountain View · Sunnyvale · Cupertino · Santa Clara · Saratoga · Los Gatos · Campbell · Milpitas
Marin County, CA
Larkspur · Mill Valley · Novato · San Rafael
San Mateo County, CA
Redwood City · San Mateo · Burlingame · Daly City · South San Francisco
What We Build 
Custom Home & Exterior Services in Northern California
Siding
James Hardie fiber cement siding that protects your home and looks great for decades. Dry rot repair, full replacements, and fresh paint.
Windows
Energy-efficient window replacements that improve your home's comfort and curb appeal. Professionally installed with a full warranty.
ADUs
Detached ADUs, garage conversions, and junior ADUs that add living space and rental income. Design, permitting, and construction under one roof.
Additions
Seamless room additions that match your home's existing style. Second stories, room extensions, and full remodels, end-to-end.
Custom Homes
Ground-up custom home construction tailored to your vision. Architect-led from foundation to finishing touches.
Ready to start? (650) 977-3351
Call now — we pick up in minutes. Or fill out the form above and we'll call you.
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 →
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.