San Leandro homeowners deserve a contractor who brings an architect's eye to every project. Hamilton Exteriors, led by Alex Hamilton Li (Architect and General Contractor, CSLB #1078806), provides full-service design-build contracting across San Leandro. From roof replacements and siding installations to ADUs and custom homes, we handle every phase of your project with transparent pricing and city-specific expertise.
Why Choose Hamilton Exteriors as Your San Leandro Contractor
Most general contractors in San Leandro focus on execution alone. Hamilton Exteriors is different. We are architect-led, which means we evaluate your home as a complete system — considering structural capacity, energy performance, fire safety, and aesthetics together. Every estimate is fully itemized, with per-square pricing and no lump-sum surprises. We have completed over 500 projects across the Bay Area since 2018, and we bring that experience to every San Leandro job.
Our Services in San Leandro
Roofing
San Leandro homes face a range of roofing challenges. The city sits in a mild Mediterranean climate, but coastal fog from the Bay can accelerate corrosion on exposed flashing and untreated metal components. Homes in the San Leandro Hills and areas near the Oakland border may fall within Wildland-Urban Interface (WUI) Local Responsibility Areas, where Class A fire-rated roofing materials are required under 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 50-year system warranties. A typical asphalt shingle roof replacement on a 2,000 sq ft San Leandro home costs $18,000 to $25,000, including tear-off, underlayment, flashing, and permit fees. Get Your Free Quote.
Siding
San Leandro's older housing stock — much of it built before 1970 — often features original wood siding that requires replacement or repair. We install James Hardie fiber cement siding, a durable, fire-resistant material that performs well in the Bay Area's coastal climate. HardiePlank and HardiePanel products resist moisture, rot, and termites, and carry a 30-year non-prorated warranty. Siding replacement on a typical San Leandro home ranges from $12,000 to $30,000 depending on square footage and complexity.
Windows
Energy-efficient window replacement improves comfort and reduces utility bills. We install windows from major manufacturers that meet California Title 24 energy code requirements. San Leandro's mild climate means double-pane, low-E windows are sufficient for most homes. Window replacement costs $800 to $1,500 per window installed, depending on size, material (vinyl, fiberglass, or wood), and glazing options. Explore our window services.
ADU Construction
San Leandro allows accessory dwelling units (ADUs) under state law and local zoning. We handle the entire process — design, permitting, and construction. A typical attached ADU (500 to 800 sq ft) costs $180,000 to $300,000. Detached ADUs run $200,000 to $350,000. Permit fees through the City of San Leandro Building Department typically add $3,000 to $8,000. We include permit fees in our itemized estimates. Read our ADU cost guide.
Home Additions
Adding square footage to your San Leandro home increases living space and property value. We design and build second-story additions, room additions, and bump-outs. Costs vary widely: a 400 sq ft ground-floor addition runs $120,000 to $200,000, while a second-story addition on a similar footprint costs $200,000 to $350,000. Structural tie-down inspections are common in San Leandro due to proximity to the Hayward Fault, and we account for that in our planning. See our addition services.
Custom Homes
For homeowners who want a completely new home on their San Leandro lot, we offer full custom home design and construction. Every project begins with a site analysis and architectural design by Alex Hamilton Li. Custom home costs in San Leandro typically range from $350 to $600 per square foot, depending on finishes, site conditions, and complexity. Learn about custom home building.
Decks
San Leandro's mild climate makes outdoor living spaces a valuable addition. We build decks using composite, cedar, and pressure-treated lumber. A typical 300 sq ft deck costs $15,000 to $30,000. Permit fees through the city are $200 to $500. Explore deck options.
San Leandro Building Permits and Codes
Every construction project in San Leandro requires a building permit from the City of San Leandro Building Department. Permit fees vary by project scope:
- Roof replacement: $300 to $600
- Siding replacement: $200 to $400
- Window replacement: $100 to $300 per window
- ADU: $3,000 to $8,000
- Home addition: $1,500 to $5,000
- Deck: $200 to $500
Hamilton Exteriors handles all permit applications and scheduling of inspections. We never suggest skipping the permit process — it protects you at sale and ensures code compliance.
San Leandro Climate and Construction Considerations
San Leandro's location on the eastern shore of San Francisco Bay creates specific conditions for home exteriors:
- Coastal fog and corrosion: Salt-laden marine air accelerates corrosion on exposed metal components. We specify stainless steel or coated fasteners and flashing in all San Leandro projects.
- Mild temperatures: Average highs of 70°F in summer and 55°F in winter mean less thermal stress on materials, but moisture from fog and rain requires proper ventilation and waterproofing.
- Seismic risk: The Hayward Fault runs through the East Bay, and San Leandro is within the zone of expected strong ground motion. We follow current California Building Code seismic requirements, including structural tie-downs for additions and roof replacements.
San Leandro Fire Safety
While much of San Leandro is not in a designated Very High Fire Hazard Severity Zone (FHSZ), properties in the San Leandro Hills and areas near the Oakland border may fall within WUI Local Responsibility Areas. For those homes, California Building Code Chapter 7A requires:
- Class A fire-rated roofing materials
- Non-combustible or fire-resistant siding
- Ember-resistant vents
- Tempered glass in windows within 5 feet of the ground
We assess fire zone requirements during every initial inspection and include any necessary upgrades in our estimate.
Get Your Free Quote
Ready to start your San Leandro home project? Call us at (650) 977-3351 or Get Your Free Quote. We will schedule a complimentary on-site inspection and provide a fully itemized estimate within 48 hours.
Hamilton Exteriors 21634 Redwood Rd Unit F, Castro Valley, CA 94546 CSLB #1078806
Serving San Leandro and all of Alameda County.
