About Hamilton Exteriors
An architect-led design-build contractor from Castro Valley. One team designs, permits, and builds your project under one contract.
500+ projects
Since 2018
Up to 50-Year
Select GAF Warranties
Get Your Free Quote
We'll call you within 3–5 minutes to schedule your inspection.
Your information is private and secure
Factory-certified by our manufacturer partners
Design and Construction Under One Roof
Hamilton Exteriors started in 2018 in Castro Valley. Most homeowners hire an architect, then a builder, then spend months between them. We set the company up so that never happens. The person who draws the plan answers for how it gets built.
Today we work across Alameda, Contra Costa, Marin, Napa, San Mateo, and Santa Clara counties. The jobs range from one-day roof repairs to ground-up custom homes. Every estimate is itemized line by line.
Led by a licensed architect and general contractor. Meet the founder
Our Mission
Named for the man who built our nation's foundation, Hamilton Exteriors carries that same conviction: build it right, build it to last. 50+ years of combined team experience, architect-level standards on every build, and one promise — every detail right the first time.
Our Crews at Work
Recent Bay Area Projects
Follow Our Work
See finished projects and job site progress from crews across the Bay Area.
What Homeowners Say About Our Work
Public reviews from Northern California homeowners.
Chandra Williams
a week ago
Roof City did an excellent job on my roof. They were professional, fast, efficient, and clean. They over- delivered on their promise to do a five- star job in two days, which included all materials and permits needed. They deserve a 10 star rating 🌟 ✨ 💫🌟✨💫🌟✨💫☀️🙌🏾😀👍🏾
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!
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.
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.
How Hamilton Exteriors
Manages the Work
Itemized Scope
Your proposal identifies included work, selected materials, permit allowances, payment timing, and exclusions before construction.
Relevant Credentials
Hamilton Exteriors holds CSLB #1078806. We show manufacturer credentials only where they apply to the selected system.
Warranty Review
We explain the product and workmanship warranty terms that apply to your selected scope before work begins.
One Project Contact
One contact coordinates the schedule, field questions, inspections, and project closeout.
Plan Your Project With a Clear Scope
Financing may be available with approved credit for eligible projects.
Tell us about your project. We usually call within 3–5 minutes to schedule the next step.
Call Now (650) 977-3351 
21634 Redwood Rd Unit F, Castro Valley, CA 94546
Serving 88 cities across the Bay Area, Greater Sacramento, and Central Valley. Explore all service areas →