Now Booking Fall 2026: Schedule Your Consultation
500+ projects
Since 2018
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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
A complete design-build path from site study and program through architecture, engineering, permits, construction, inspections, and closeout.
Architect-led planning shaped by the lot, views, access, climate, structure, building systems, interiors, budget, and permit constraints.
Coordination for planning review, architecture, engineering, energy documents, fire requirements, utility agencies, comments, and revisions.
Architect-led work for existing homes when the new scope must respond to the original structure, site, systems, and architectural character.
Local planning starts with the site, neighborhood context, access, and applicable city review.
Blithedale Canyon's wooded setting inspires custom homes that integrate with the natural landscape. We design residences around existing redwoods, using large glazing walls and natural materials that connect interior spaces to the surrounding forest.
Cascade Canyon's remote beauty demands custom homes engineered for hillside stability and fire resilience. We build with non-combustible materials, defensible space planning, and foundation systems designed for the canyon's steep, dynamic terrain.
Country Club's prestigious setting calls for architecturally significant custom homes. We design and build residences with premium materials, detailed millwork, and sophisticated floor plans that reflect the elevated standards of this Mill Valley enclave.
We review the lot, survey, zoning, access, utilities, soil information, site constraints, and the homeowner's space requirements.
Architecture, engineering, building systems, selections, permit needs, budget, and construction methods develop through one coordinated process.
We coordinate agency review, site work, foundation, structure, envelope, building systems, finishes, inspections, and documented scope changes.
We complete final inspections and the punch list, organize manuals and closeout records, and review applicable warranty terms.
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 GoogleSwipe 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 |
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.
Didn't find the answer to your question? Call Now (650) 977-3351
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.
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.
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.
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.
For a Mill Valley custom home, request an estimate based on the design, finish selections, and actual lot. Identify site access, grading, foundation work, and any retaining walls separately from the house construction. Confirm design, engineering, permits, landscaping, and specialty features in the written scope before comparing prices.
### Architect-Led Design-Build Unlike most Mill Valley custom home builders, Hamilton Exteriors is led by a licensed architect and general contractor. This means design and construction are handled under one contract, eliminating the coordination gaps that cause delays and cost overruns.
Mill Valley custom homes cost $400 to $850 per square foot in 2026 (Hamilton Exteriors 2024-2026 project data). A 2,500 sq ft home typically runs $1,000,000 to $2,125,000 including design, engineering, permits, and construction. Hillside lots with difficult access or poor soil conditions tend toward the higher end. We provide detailed, itemized estimates at every stage.
Custom home construction in Mill Valley takes 12 to 18 months from permit approval. The design and permitting phase adds 4 to 8 months depending on architectural complexity and local plan review timelines. Total timeline from initial consultation to move-in is typically 18 to 24 months.
Yes. Every new home in Mill Valley requires a building permit from the City of Mill Valley Building Division. The permit process includes plan check, structural review, energy compliance verification, and fire department review for WUI zone properties. We handle the entire permit process as part of our design-build service.
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.
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21634 Redwood Rd Unit F, Castro Valley, CA 94546
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