Looking for a reliable contractor in Larkspur? Hamilton Exteriors brings an architect's eye and a general contractor's execution to every project in this Marin County community. We serve Larkspur homeowners with roofing, siding, window replacement, ADU construction, home additions, and custom homes — all led by Alex Hamilton Li, a licensed architect and general contractor (CSLB #1078806).
Get your free quote today and see how an architect-led approach makes your Larkspur home project different.
Why Larkspur Homeowners Choose an Architect-Led Contractor
Most contractors in Larkspur are tradesmen-first. They know how to build, but they may not think about how your roof, siding, windows, and additions work together as a system. Hamilton Exteriors is different. Alex Hamilton Li is both a licensed architect and a general contractor. That means every estimate considers design, structural integrity, energy performance, and Marin County building codes together — not just the installation.
This architect-led approach matters especially in Larkspur, where homes range from mid-century moderns in the flats to hillside properties in the WUI fire zone. A roof replacement on a flat Larkspur home involves different considerations than the same job on a steep-slope property near Baltimore Canyon. We evaluate each home individually and provide fully itemized estimates that break out every cost.
Our Services in Larkspur
Roofing
Larkspur's coastal fog and proximity to the San Andreas Fault create specific conditions for roofing. Salt-laden marine air accelerates corrosion on exposed metal components, and seismic activity demands proper fastening patterns. Most of Marin County falls within CAL FIRE's High or Very High Fire Hazard Severity Zones, which means strict Class A fire-rated materials and ember-resistant vents are required for compliance with California Chapter 7A standards.
We install asphalt shingles, metal roofing, tile, and flat roofing systems from GAF, CertainTeed, and Owens Corning. As a GAF Master Elite contractor, we offer the industry's strongest 50-year system warranty.
Typical Larkspur roof replacement costs range from $18,000 to $45,000 for a standard 2,000 sq ft home, depending on material choice and roof complexity. Permits from the City of Larkspur Building Division add $500 to $1,200. Learn more on our roofing services page.
Siding
Larkspur's marine climate demands siding materials that resist moisture and temperature swings. We specialize in James Hardie fiber cement siding, which handles coastal conditions better than wood or vinyl. HardiePlank lap siding, HardiePanel vertical siding, and HardieShingle all carry a 30-year non-prorated warranty and resist fire, rot, and insects.
Siding replacement in Larkspur typically costs $12,000 to $35,000, including removal of old siding, house wrap, trim, and painting. See our siding services page for details.
Windows
Energy-efficient windows reduce heating costs in Larkspur's cool, foggy winters and improve comfort year-round. We install windows from Marvin, Andersen, and Milgard, with double-pane, Low-E glass and argon gas fill. Marin County's Title 24 energy code requires specific U-factor and Solar Heat Gain Coefficient ratings — we handle all compliance documentation.
Window replacement costs in Larkspur range from $800 to $2,500 per window installed, depending on size, material, and glass package. Visit our window replacement services page.
ADU Construction
Accessory dwelling units are a smart way to add living space and property value in Larkspur, where single-family zoning dominates. We design and build attached and detached ADUs, garage conversions, and junior ADUs. Every project includes permit handling with the City of Larkspur, which has specific setback, height, and parking requirements.
ADU construction in Larkspur typically costs $150,000 to $400,000, depending on size and finishes. See our ADU construction services page.
Home Additions
Expanding your Larkspur home — whether a kitchen bump-out, second-story addition, or family room extension — requires careful structural planning, especially in Marin's seismic zone. We handle foundation work, framing, roofing integration, and all finish trades in-house.
Home additions in Larkspur range from $80,000 to $300,000. Visit our home addition services page.
Custom Homes
From ground-up custom homes on Larkspur lots to major remodels that transform existing structures, we bring architect-led design-build to every project. Our process covers site analysis, design, permitting, and construction.
Larkspur Building Permits and Codes
Every exterior project in Larkspur requires a building permit from the City of Larkspur Building Division. Permit fees vary by project scope:
- Roof replacement: $500 to $1,200
- Siding replacement: $300 to $800
- Window replacement: $100 to $300 per window
- ADU: $2,000 to $5,000
- Home addition: $1,500 to $4,000
Hamilton Exteriors pulls all permits on your behalf and schedules all required inspections. We know Larkspur's building officials and inspection process, which means fewer delays and every cost itemized.
Larkspur-Specific Considerations
Fire Safety
Most of Larkspur sits within a CAL FIRE-designated High or Very High Fire Hazard Severity Zone. Homes in these zones must comply with California Building Code Chapter 7A, which requires:
- Class A fire-rated roofing materials (asphalt shingles, metal, tile, or Class A composition)
- Ember-resistant attic and eave vents (1/8-inch mesh or tested assemblies)
- Ignition-resistant exterior walls (fiber cement siding, stucco, or fire-treated wood)
- Tempered glass in windows within 5 feet of the ground
We verify Chapter 7A compliance on every Larkspur project and include all required materials in our estimates.
Seismic Considerations
Larkspur sits near the San Andreas Fault, which runs through western Marin County. While most of Marin is classified as moderate seismic risk, older homes — particularly those built before 1980 — may need structural reinforcement during roof replacement or additions. We assess shear wall adequacy, foundation connections, and roof-to-wall ties on every project and recommend upgrades where needed.
Climate
Larkspur's coastal fog and moderate temperatures create a unique microclimate. Roofs and siding face constant moisture exposure, which accelerates wear on untreated wood and standard metal components. We specify corrosion-resistant fasteners, premium synthetic underlayment, and moisture-resistant siding materials for all Larkspur projects.
Pricing Philosophy
Every Hamilton Exteriors estimate is fully itemized. You see the cost of materials, labor, permits, and cleanup as separate line items. every line itemized, no vague ranges. We quote per-square pricing for roofing ($940 to $1,800 per square depending on material) and per-project pricing for other services (Hamilton Exteriors 2024-2026 project data).
Our pricing includes:
- All materials and labor
- Permit fees
- Tear-off and disposal (roofing, siding)
- Manufacturer warranties
- Workmanship warranty
Excluded from standard pricing: structural repairs discovered during tear-off, additional decking replacement beyond 5 sheets, and upgrades beyond the scope of the original estimate. We quote these contingencies upfront so there are every cost itemized.
Get Your Free Quote
Ready to start your Larkspur home project? Call us at (650) 977-3351 or request your free quote online. We serve Larkspur and all of Marin County with architect-led design-build services.
Hamilton Exteriors | 21634 Redwood Rd Unit F, Castro Valley, CA 94546 | CSLB #1078806
