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Hamilton Exteriors — roofing, siding, and exterior remodeling in Los Gatos, CA
4.8-star rated by 39 verified Northern California homeowners

CSLB #1078806 · Architect & General Contractor · Building Northern California homes since 2018

Roofing, Siding & Exterior Remodeling in Los Gatos

Serving Los Gatos & Santa Clara County
Licensed Bonded & Insured
$0 Down Financing Available
50-Year Warranty

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Factory-certified by our manufacturer partners

Owens Corning Preferred Contractor
CertainTeed ShingleMaster
GAF Master Elite Contractor
Tesla Powerwall Certified
James Hardie Elite Preferred

Hillside neighborhoods in the Santa Cruz Mountains foothills, including areas near Lexington Reservoir, are in designated WUI fire zones. Class A fire-rated materials are required, and brush clearance is enforced. We work across Los Gatos — including Downtown, Almond Grove and Blossom Hill — with the architect-led design-build approach Hamilton Exteriors brings to every Bay Area project.

Hamilton Exteriors is a Los Gatos general contractor offering architect-led design-build services for homeowners across Santa Clara County. Founded by Alex Hamilton Li, a licensed architect and general contractor (CSLB #1078806), we bring a designer's eye and a builder's precision to every project. From roofing and siding to ADUs and custom additions, we handle the full scope of your home exterior.

Why Choose an Architect-Led Contractor in Los Gatos?

Most general contractors in Los Gatos are tradesmen-only. As an architect and GC, Alex evaluates your home as a complete system. He considers structural capacity, energy performance, fire safety, and aesthetics together. This approach means fewer change orders, better material choices, and a result that fits your home's character.

Our Services in Los Gatos

We provide a full range of home exterior services:

  • Roofing: Asphalt shingles, metal, tile, and flat roofing. GAF Master Elite certified. See our roofing services page.
  • Siding: James Hardie fiber cement siding, wood, and stucco. James Hardie Elite Preferred contractor. See our siding services page.
  • Windows: Energy-efficient replacement windows from leading manufacturers. See our window replacement services page.
  • ADUs: Accessory dwelling units, from garage conversions to new construction. See our ADU construction services page.
  • Home Additions: Second-story additions, room expansions, and bump-outs. See our home addition services page.
  • Custom Homes: Ground-up custom home construction.

Los Gatos-Specific Considerations

Los Gatos presents unique challenges that a local contractor must understand:

  • Fire Risk: The Los Gatos hills are in a Very High Fire Hazard Severity Zone (FHSZ) as designated by CAL FIRE. Homes in these areas require Class A fire-rated roofing materials and Chapter 7A-compliant installation methods, including specific underlayment, edge metal, and venting.
  • Climate: Los Gatos experiences hot summers, often exceeding 95°F in the valley. The foothills are cooler. This microclimate affects material selection, particularly for roofing and siding. Cool-roof materials can reduce cooling costs by 10 to 25 percent according to Oak Ridge National Laboratory.
  • Seismic: The region is near the San Andreas, Calaveras, and Hayward faults. Older homes may need structural reinforcement before adding heavy materials like tile roofing.
  • Permitting: The Town of Los Gatos Building Division handles all permits. Permit fees for a typical roof replacement range from $400 to $800. Your contractor should pull the permit. Visit the Los Gatos Building Department for details.

Pricing Transparency

We provide fully itemized estimates with per-square pricing. For a typical home in Los Gatos:

  • Roof replacement (asphalt shingles): $19,500 to $24,000 for a 2,000 sq ft roof, including tear-off, underlayment, flashing, and permit. See our roof replacement cost guide for a full breakdown.
  • ADU construction: $250,000 to $500,000 depending on size and finishes. See our ADU cost guide.
  • Home addition: $300 to $600 per square foot, depending on complexity.

Get Your Free Quote

Ready to start your project? Call us at (650) 977-3351 or request your free quote online. We serve Los Gatos and all of Santa Clara County. CSLB #1078806.

500+

Projects Completed

10+

Years Experience

50yr

Warranty Coverage

4.8

Average Rating

Rated 4.8 ★ from 39 Verified Northern California Homeowners

What Homeowners Say About Our Work

Real reviews from verified Northern California homeowners.

deborah maxey, Hamilton Exteriors customer

deborah maxey

in the last week

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.

Local Expertise

Exterior Projects in Los Gatos, California

Los Gatos has approximately 12,000 housing units. The charming downtown area features historic homes from the early 1900s, while hillside neighborhoods offer larger custom homes with premium roofing requirements.

Los Gatos requires building permits for all roof replacements. Properties in the Historic Preservation Zone have additional review requirements to ensure roofing materials are compatible with the home's architectural character.

Hillside neighborhoods in the Santa Cruz Mountains foothills, including areas near Lexington Reservoir, are in designated WUI fire zones. Class A fire-rated materials are required, and brush clearance is enforced.

$2,200,000

Median home value

33,000

Population

40 minutes

From our office

WUI Zone

Fire-rated materials required

Permit Authority

Town of Los Gatos Community Development Department · (408) 354-6874

Local Tip

Los Gatos's Historic Preservation Zone covers much of downtown — roofing projects on designated properties require compatibility review. Natural wood shake look-alikes in composite material are the most popular approved alternative to original wood roofs.

What We Build

Custom Home & Exterior Services in Los Gatos

Custom Homes services by Hamilton Exteriors in Los Gatos

Custom Homes

Ground-up custom homes designed for Los Gatos's 1880s-1920s Victorians and Craftsman bungalows in historic downtown neighborhoods. Architecture, engineering, permitting, and construction — all under one roof.

ADUs services by Hamilton Exteriors in Los Gatos

ADUs

Detached ADUs, garage conversions, and junior ADUs in Los Gatos. Full design-build with our 60-day permit guarantee.

Roofing services by Hamilton Exteriors in Los Gatos

Roofing

Roof replacement and repair in Los Gatos. Historic downtown requires materials compatible with Victorian/Craftsman character — architectural shingles in period colors, synthetic slate. Asphalt shingles, metal, tile, and cool roofing with manufacturer-backed warranties.

Siding services by Hamilton Exteriors in Los Gatos

Siding

Downtown historic homes have original wood lap/shingle — restoration and fiber cement both common depending on Historic Preservation Zone. James Hardie fiber cement, stucco, and waterproofing for Los Gatos homes with 30-year product warranties.

Windows services by Hamilton Exteriors in Los Gatos

Windows

Energy-efficient window replacement in Los Gatos — Title 24 Climate Zone 4 compliant. Historic downtown windows (bay, specialty shapes, divided-lite) require custom replacement.

Our Advantage

Why Choose
Hamilton Exteriors?

Transparent Pricing

Every estimate is itemized line by line — materials, labor, permits, cleanup. You see exactly where your money goes before we start.

Factory Trained Installers

Every crew member is manufacturer-certified and vetted — licensed, bonded, insured, and background-checked before they touch your home.

50-Year Warranty

50-year manufacturer warranty backed by our own workmanship guarantee for the full duration. If anything fails, we fix it — free.

Your Own Project Manager

One dedicated point of contact from first call to final walkthrough. You’ll always know who to reach.

Serving Los Gatos's Best Neighborhoods

Hamilton Exteriors has completed projects across Los Gatos — from Downtown Los Gatos to Los Gatos Meadows. Here are some of the communities we serve.

Downtown Los Gatos

Downtown Los Gatos is one of Los Gatos's most sought-after neighborhoods. Homes here — 1880s-1920s Victorians and Craftsman bungalows in historic downtown — face specific challenges from valley floor 82-90°F summers. SIGNIFICANT fire risk in hillside neighborhoods — many in VHFHSZ. San Andreas Fault 3 miles west. Los Gatos Hills 5-10°F cooler with more rainfall (22-28 inches). Heavy oak/redwood canopy above town.. Hamilton Exteriors has completed dozens of projects in Downtown Los Gatos, from full roof replacements to custom ADUs.

Shannon

Homeowners in Shannon trust Hamilton Exteriors for everything from siding upgrades to second story additions. Common issues we address here include historic downtown homes with aging slate/shake roofs needing sensitive renovation. Our team knows Santa Clara County's Title 24 Climate Zone 4 requirements and takes pride in work that enhances the neighborhood's character.

Blossom Hill

From energy-efficient window installations to ground-up custom homes, Blossom Hill residents choose Hamilton Exteriors for our design-build expertise. With Los Gatos's microclimate — Dramatic variation within small area — material selection matters. We handle architecture, engineering, permits, and construction.

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 (six counties from Alameda to Santa Clara), Greater Sacramento (Sacramento out to Roseville, Folsom, and Davis), and the Central Valley (Stockton to Modesto). Our crews are based in Castro Valley. We handle permits and know the building codes for each jurisdiction, which matters because requirements and fees vary significantly between cities.

How does billing and financing work?

We offer $0-down financing with approved credit, 12-month same-as-cash plans, and extended terms up to 15 years for larger projects. You only pay for completed, inspected work — we never ask for full payment before the job is done. Your project manager will walk you through every option during your estimate appointment. We also accept checks, ACH, and all major credit cards.

Are you licensed and insured?

Yes. CSLB License #1078806 — verify it anytime at cslb.ca.gov. We carry $2M general liability, full workers’ comp, and are bonded per California law. We hold GAF Master Elite, Owens Corning Preferred, CertainTeed ShingleMaster, and James Hardie Elite Preferred certifications — each requires annual training and quality audits to maintain. We’re happy to provide proof of insurance before any work begins.

Do I need a permit for my exterior project?

Most exterior projects in Northern California require a building permit. Fees vary by city — Oakland runs $200–$600, Peninsula cities often more. We handle the entire permit process: application, plan submission, and scheduling inspections. Permit fees appear as a separate line item in your estimate so you’ll see every cost upfront. For homes in WUI fire zones (Berkeley Hills, Oakland Hills, parts of Marin), we ensure full compliance with local fire-rated material requirements.

Why Choose an Architect-Led Contractor in Los Gatos?

Most general contractors in Los Gatos are tradesmen-only. As an architect and GC, Alex evaluates your home as a complete system. He considers structural capacity, energy performance, fire safety, and aesthetics together. This approach means fewer change orders, better material choices, and a result that fits your home's character.

How much does a general contractor cost in Los Gatos?

General contractor rates in Los Gatos vary by project type. For a roof replacement, expect $19,500 to $24,000 (Hamilton Exteriors 2024-2026 project data). For an ADU, $250,000 to $500,000. Hamilton Exteriors provides itemized estimates so you see exactly where every dollar goes.

Do I need a permit for a home addition in Los Gatos?

Yes. The Town of Los Gatos requires permits for most structural work, including additions, roof replacements, and ADUs. Permit fees vary by project scope. Hamilton Exteriors handles all permit applications and inspections.

What is the best roofing material for a Los Gatos home?

For most Los Gatos homes, premium architectural asphalt shingles offer the best balance of cost and performance. In the hillside fire zones, metal roofing is recommended for its Class A fire rating and 40 to 70 year lifespan.

How long does a roof replacement take in Los Gatos?

Most asphalt shingle roof replacements take 2 to 4 days. Metal and tile roofs take longer, typically 5 to 10 days. Permit issuance adds 1 to 2 weeks before work starts.

Does Hamilton Exteriors serve all of Santa Clara County?

Yes. We serve all of Santa Clara County, including Los Gatos, San Jose, Palo Alto, Mountain View, Sunnyvale, Cupertino, and Saratoga. See our Santa Clara County service area page.

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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 →

Hamilton Exteriors — Serving Los Gatos, CA