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Custom Home Builder in Marin County
500+ projects
Since 2018
Limited Lifetime
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Share your site and project goals. Our architect-led team will discuss feasibility, design, permits, and construction planning.
Custom home certifications, brands, and contractor credentials
Customer-Service Obsessed
Responsive from consultation through project closeout
Architect and general contractor
One accountable team
Licensed, bonded, and insured
Verified business credentials
Start With the Custom Home Service You Need
Ground-Up Custom Homes
A complete design-build path from site study and program through architecture, engineering, permits, construction, inspections, and closeout.
Custom Home Design
Architect-led planning shaped by the lot, views, access, climate, structure, building systems, interiors, budget, and permit constraints.
Custom Home Permits
Coordination for planning review, architecture, engineering, energy documents, fire requirements, utility agencies, comments, and revisions.
Site-Specific Additions and Renovations
Architect-led work for existing homes when the new scope must respond to the original structure, site, systems, and architectural character.
How Hamilton Exteriors
Manages Your Custom Home Project
Site and Program Study
We review the lot, survey, zoning, access, utilities, soil information, site constraints, and the homeowner's space requirements.
Design and Scope Coordination
Architecture, engineering, building systems, selections, permit needs, budget, and construction methods develop through one coordinated process.
Permits and Construction
We coordinate agency review, site work, foundation, structure, envelope, building systems, finishes, inspections, and documented scope changes.
Move-In and Closeout
We complete final inspections and the punch list, organize manuals and closeout records, and review applicable warranty terms.
Homeowner Reviews of Our Construction Work
Public feedback from remodeling and related construction projects.
Kevin L
via Google
We hired them for a bigger renovation. Alex was very responsive, which I appreciated. We changed a couple requirements during the job and they worked with us on it without making it complicated. Overall, everything went pretty smooth and their quality of work is solid. I recommend them highly!
Jacob Rothwell
via Google
Alex Li helped me with my basement remodeling, they were super efficient, and the work came out better than I could’ve ever imagined! Thank me later!
Maan D
via Google
Had Hamilton Exteriors do a full kitchen renovation. Natasha helped a lot with scheduling and coordination which made things easier on our end. We got regular updates and didn’t feel left in the dark at any point. The team paid attention to details and made sure everything was installed properly. the whole process felt pretty smooth and the kitchen came out really clean. happy with the final result
Lekan Ajayi
via Google
This service was good and very efficient, all remodeling was done to liking. Jacob was a great worker and helped with answering questions that was needed. Would recommend to others.
Google rating: 4.6/5 from 47 public reviews
Read reviews on GoogleCompare Broad Custom Home Starting Points
Swipe to compare all options.
| Feature | Ground-Up Home | Hillside Home | Existing-Home Transformation |
|---|---|---|---|
| Starting condition | Vacant or cleared building site | Sloped or access-constrained site | Existing residence and systems |
| Early investigation | Survey, utilities, zoning, and soils | Survey, soils, slope, drainage, and access | Existing plans, field verification, and selective investigation |
| Main structural focus | New foundation and complete structure | Foundation, retaining, drainage, and seismic design | Connections between existing and new work |
| Design coordination | Whole-home program and systems | Home, site, views, and construction access | New scope, existing character, and occupied-home constraints |
| Dedicated guide | Ground-up custom homes | Start with custom home design | Site-specific renovation |
Plan Your Construction Budget With Approved Credit
Financing may be available for eligible custom home construction scopes with approved credit. During early planning, we align the project scope and payment milestones, then explain which current lender programs and terms may fit the proposed work.
Ask which current options fit your custom home project.
Call Now (650) 977-3351 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, Greater Sacramento, and the Central Valley. Our published guides cover 14 counties and 88 cities. Our Castro Valley and Sacramento offices support local estimating, permit coordination, and project planning across these regions.
How does billing and financing work?
Financing may be available for eligible projects with approved credit. Available terms depend on lender approval, project scope, and current programs. Your project manager can review the options that apply before work begins. We also accept checks, ACH, and major credit cards.
Are you licensed and insured?
Yes. Hamilton Exteriors holds CSLB License #1078806, active general liability coverage, and the required contractor bond. We also hold GAF Master Elite and James Hardie Elite Preferred credentials. We can provide current proof of coverage before work begins.
Do I need a permit for my exterior project?
Permit requirements depend on the project scope and local jurisdiction. Hamilton Exteriors coordinates required applications, plan documents, corrections, and inspections. Permit fees and allowances appear in the proposal before construction begins.
How much does custom homes cost in Marin County?
Custom Homes costs in Marin County vary by city — from Larkspur to San Rafael. With median home values averaging $1,600,000 across the county, we see a range of project scopes. Hamilton Exteriors provides free, itemized estimates for every Marin County project with no hidden fees.
How long does it take to build a custom home in Marin County?
Most custom homes in Marin County take 12-18 months from design to completion. The Marin County permitting process adds 2-4 months. We manage every phase so there are no gaps between design, permits, and construction.
Does Hamilton Exteriors handle permits for custom homes in Marin County?
Yes. We handle all custom home permitting in Marin County and Marin County — architectural plans, structural engineering, soils reports, Title 24 energy compliance, and city submissions. We navigate Marin County planning departments daily.
Can I build a modern farmhouse in Marin County?
Absolutely. Modern farmhouse is one of our most requested styles in Marin County. We design and build everything from contemporary modern to craftsman and Mediterranean. Many homeowners in Novato are choosing modern designs that complement the neighborhood character.
Do you build on hillside lots in Marin County?
Yes. Many lots in Marin County and Marin County are on slopes. We have extensive experience with hillside construction, including retaining walls, custom foundations, and grading. Our engineers evaluate every lot for feasibility.
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.
Also serving Marin County
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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 →