If you own a home in Concord, you know the East Bay climate is different from San Francisco or Oakland. Summer temperatures regularly push past 100°F, and the Concord Fault runs directly beneath the city. Your home's exterior needs to handle thermal cycling, seismic risk, and the occasional winter storm — all while looking good on your block.
At Hamilton Exteriors, we are a full-service design-build contractor serving Concord homeowners with roofing, siding, windows, ADUs, home additions, and custom homes. We are led by Alex Hamilton Li, a licensed architect and general contractor (CSLB #1078806). We bring an architect's eye to every project, from a straightforward roof replacement to a ground-up custom build.
Ready to discuss your project? Get Your Free Quote.
Why Concord Homeowners Choose Hamilton Exteriors
Most general contractors in Concord are tradesmen who subcontract design work. We are different. As an architect-led design-build firm, we handle the full process — from initial design through permit approval and construction — under one roof. This means fewer handoffs, fewer miscommunications, and a single point of accountability for your project.
We have completed over 500 projects across the Bay Area since 2018, including dozens in Concord and the surrounding Contra Costa County communities. Our team knows the Concord building department, the local code requirements, and the specific challenges that come with East Bay homes.
Our Services in Concord
Roofing in Concord
Concord's hot inland summers put significant stress on roofing materials. Temperatures above 100°F cause asphalt shingles to expand and contract, accelerating granule loss and curling over time. A typical asphalt shingle roof replacement in Concord costs between $17,500 and $21,500 for a 2,000 sq ft home, including tear-off, underlayment, flashing, and permit fees (Hamilton Exteriors 2024-2026 project data). Permit fees in Concord typically run $250 to $550, depending on the scope.
We install GAF Timberline HDZ shingles with a 50-year system warranty, metal roofing for fire-prone hillside properties, and tile for Mediterranean-style homes. Every roof replacement includes a full inspection of the decking, ventilation, and flashing — not just a shingle swap. See our roofing services in Concord page for details.
Siding in Concord
Fiber cement siding from James Hardie is the most popular choice in Concord. It resists the heat, resists moisture from winter rains, and carries a Class A fire rating — important in a county where the East Bay hills are designated Very High Fire Hazard Severity Zones by CAL FIRE. We are a James Hardie Elite Preferred Contractor, the highest certification level.
Siding replacement costs vary widely by home size and material. A typical fiber cement siding project on a 1,500 sq ft home runs $15,000 to $25,000. We provide fully itemized estimates so you see exactly where your money goes. Learn more about our siding services in Concord.
Window Replacement in Concord
Older Concord homes — many built in the 1950s through 1970s — often have single-pane windows that leak heat in winter and let in solar gain in summer. Replacing them with dual-pane, Low-E windows reduces energy bills and improves comfort. Window replacement costs $600 to $1,200 per window installed, depending on size, frame material, and glass package (Hamilton Exteriors 2024-2026 project data).
We install windows from major manufacturers and handle all Concord permit requirements. See our window replacement in Concord page.
ADU Construction in Concord
Concord allows accessory dwelling units on most single-family lots under California's statewide ADU laws. A typical detached ADU in Concord costs $200,000 to $400,000, depending on size, finishes, and site conditions (Hamilton Exteriors 2024-2026 project data). We handle the full process: design, engineering, permit application, and construction.
Concord's ADU permit fees are generally $2,000 to $5,000, and the city's planning department reviews ADU applications within 60 days under state law. We have built ADUs in Concord and know the local process. See our ADU construction in Concord page for more.
Home Additions in Concord
Adding square footage to your Concord home — whether a second story, a family room bump-out, or a primary suite — requires careful structural planning, especially given the Concord Fault's seismic activity. A ground-floor addition costs $300 to $500 per square foot, while a second-story addition runs $400 to $700 per square foot (Hamilton Exteriors 2024-2026 project data).
Every addition we design includes a structural engineer's review to ensure the new construction ties safely into the existing foundation and framing. See our home additions in Concord page.
Custom Homes in Concord
If you are building a new home in Concord, we offer full design-build services from site analysis through final occupancy. Custom home costs in Concord start at $400 per square foot and climb with finish level and site complexity (Hamilton Exteriors 2024-2026 project data). We handle all permitting, including Concord's planning and building department reviews.
Deck Building in Concord
A well-built deck extends your living space into Concord's warm summer evenings. We build decks using composite materials (Trex, TimberTech) and pressure-treated lumber. Deck costs range from $30 to $60 per square foot installed. See our deck building in Concord page.
Concord-Specific Considerations
Fire Risk
Parts of Contra Costa County's East Bay hills — including areas near Mount Diablo State Park — are designated Very High Fire Hazard Severity Zones (FHSZ) by CAL FIRE. While much of Concord's flatland is outside these zones, homes in the hillside neighborhoods west of downtown and near the Concord Naval Weapons Station may fall within WUI areas. If your home is in a fire zone, we use Class A fire-rated materials and install ember-resistant vents and flashing.
Climate
Concord's inland climate means summer highs above 100°F are common. This thermal cycling — daily expansion and contraction of roofing and siding materials — accelerates wear. We select materials rated for high-temperature environments and ensure proper attic ventilation to reduce heat buildup.
Seismic Risk
The Concord Fault runs through the city, and the nearby Hayward Fault is considered one of the most dangerous in the United States by the U.S. Geological Survey. Any structural work — additions, ADUs, custom homes — must account for seismic loads. We incorporate continuous load paths, shear walls, and proper foundation connections in every project.
Permits
Concord requires building permits for most exterior work, including roof replacements, siding replacement, window replacement, ADUs, additions, and decks. The Concord Building Division handles permit applications and inspections. We pull all permits on your behalf and schedule all required inspections.
How We Price Projects
Every Hamilton Exteriors estimate is fully itemized. You see the cost of materials, labor, permits, and cleanup as separate line items. We do not give lump-sum bids that hide markups. Our pricing is competitive for the quality of work we deliver — architect-led design, licensed installation, and comprehensive warranties.
For a precise quote on your Concord project, call us at (650) 977-3351 or Get Your Free Quote online.
Related Reading
- Contra Costa County service area
- Roof replacement cost guide
- ADU cost guide
- Home addition cost guide
Ready to Start Your Concord Project?
We would love to talk about your home. Call (650) 977-3351 or Get Your Free Quote online. We serve all of Concord and the surrounding Contra Costa County communities.
