Looking for a reliable general contractor in Hayward? You need someone who understands the city's specific building conditions — from the Hayward Fault running beneath the city to the varied housing stock built across decades. Hamilton Exteriors brings an architect's perspective to every project, backed by a California General Contractor license (CSLB #1078806) and more than 500 completed projects across the Bay Area.
We serve Hayward homeowners with roofing, siding, window replacement, ADU construction, home additions, custom homes, and deck building. Every estimate is fully itemized. Every project gets a dedicated project manager. And every job is led by Alex Hamilton Li, a licensed architect and general contractor who oversees work from initial inspection through final walkthrough.
Get Your Free Quote to discuss your Hayward home project.
Why Hayward Homeowners Choose Hamilton Exteriors
Hayward sits at the intersection of several Bay Area microclimates and geological zones. The city's location along the Hayward Fault means seismic considerations matter on every project. Its mild Mediterranean climate — with coastal fog influence from the bay and occasional 90-degree summer days inland — affects material choices. And the city's building department has specific requirements for permits and inspections that a local contractor should know inside and out.
Most general contractors in Hayward are tradesmen-only. Hamilton Exteriors is different: we are architect-led. That means we evaluate your home as a complete system, not just a checklist of repairs. When we replace a roof, we consider ventilation, structural capacity, and energy performance together. When we design an ADU, we think about how it connects to the existing house and yard. This integrated approach saves you money and prevents problems down the road.
Our Hayward Home Services
Roofing in Hayward
Roof replacement in Hayward typically costs $17,500 to $21,500 for a standard asphalt shingle roof on a 2,000-square-foot home, according to our 2026 pricing data (Hamilton Exteriors 2024-2026 project data). This includes tear-off of the existing roof, synthetic underlayment, new flashing, ridge vents, and permit fees. Permit fees in Hayward run $250 to $600 depending on the scope of work.
Hayward's climate is mild Mediterranean, but the city's proximity to the bay means homes in lower-lying areas can experience fog and moisture that accelerates wear on certain materials. We recommend premium architectural shingles from GAF, CertainTeed, or Owens Corning for most Hayward homes. These carry Class A fire ratings — important given that nearby Oakland Hills and Berkeley Hills are designated Wildland-Urban Interface (WUI) Local Responsibility Areas where Class A roofing is required by California Building Code Chapter 7A. While most of Hayward is not in a WUI zone, the fire rating still matters for insurance and resale value.
We are a GAF Master Elite contractor, a designation held by fewer than 3 percent of roofing companies nationwide. This certification allows us to offer GAF's 50-year system warranty, covering both materials and workmanship.
See our full roofing services page or read our roof replacement cost guide for detailed pricing by material and city.
Siding in Hayward
James Hardie fiber cement siding is the most popular choice for Hayward homes, and for good reason. It resists moisture, fire, and pests — all relevant in the Bay Area climate. We are a James Hardie Elite Preferred Contractor, which means we meet the manufacturer's highest standards for installation quality.
Siding replacement in Hayward typically runs $12,000 to $28,000 depending on the size of your home and the material chosen (Hamilton Exteriors 2024-2026 project data). HardiePlank lap siding, HardiePanel vertical siding, and HardieTrim boards are all available in a range of colors and textures.
We also install wood siding, stucco repair, and engineered wood siding. Every siding project includes proper flashing at windows and doors, weather-resistant barrier installation, and caulking at all joints.
Learn more about our siding services.
Window Replacement in Hayward
Energy-efficient window replacement can reduce your heating and cooling costs by 10 to 25 percent, according to the U.S. Department of Energy. In Hayward's climate, where summer temperatures can reach the low 90s and winter nights dip into the 40s, that translates to real savings.
We install windows from major manufacturers including Milgard, Andersen, and Pella. Double-pane, low-E glass with argon gas fill is standard. Triple-pane options are available for homes near busy streets where noise reduction matters.
Window replacement costs in Hayward range from $800 to $1,500 per window installed, depending on size, material (vinyl, fiberglass, or wood), and whether the frame needs to be replaced or just the sash (Hamilton Exteriors 2024-2026 project data).
See our window replacement services for more details.
ADU Construction in Hayward
Hayward homeowners are building accessory dwelling units (ADUs) at a growing rate, taking advantage of California's relaxed ADU laws and the opportunity to add rental income or multigenerational living space.
A typical Hayward ADU costs $150,000 to $350,000 depending on size, design complexity, and whether it is attached, detached, or a garage conversion (Hamilton Exteriors 2024-2026 project data). Permit fees through the Hayward Building Division add $2,000 to $5,000 depending on the project scope. The city's Development Services department handles ADU permits, and we handle the entire process from design through final inspection.
Hamilton Exteriors designs and builds ADUs in-house, from 400-square-foot studio units to 1,200-square-foot two-bedroom layouts. Every ADU includes a kitchen, bathroom, living area, and separate entrance. We handle all required setbacks, parking requirements, and utility connections.
Read our ADU cost guide for detailed pricing by size and type.
Home Additions in Hayward
Adding square footage to your Hayward home is often more cost-effective than moving, especially in the Bay Area's competitive housing market. A second-story addition in Hayward typically costs $250 to $450 per square foot, while a ground-floor addition runs $200 to $350 per square foot (Hamilton Exteriors 2024-2026 project data).
Hayward's location on the Hayward Fault means structural tie-down inspections are scrutinized closely during the permitting process. We work with structural engineers to ensure your addition meets current seismic codes. This is not a place to cut corners — proper engineering protects your investment and your family's safety.
See our home addition services and read our second-story addition cost guide for more information.
Custom Homes in Hayward
Building a custom home in Hayward requires navigating the city's planning department, design review process, and building codes. We handle all of it, from initial site analysis through final occupancy permit.
Custom home construction in Hayward typically costs $350 to $600 per square foot, depending on finishes, site conditions, and design complexity (Hamilton Exteriors 2024-2026 project data). We work with architects (including our own in-house architect, Alex Hamilton Li) to create homes that fit your lot, your lifestyle, and your budget.
Deck Building in Hayward
A well-built deck extends your living space and adds value to your home. We build decks using pressure-treated lumber, cedar, composite decking (Trex, TimberTech), and tropical hardwoods.
Deck costs in Hayward range from $30 to $60 per square foot for basic pressure-treated wood to $50 to $80 per square foot for premium composite materials (Hamilton Exteriors 2024-2026 project data). All decks include proper footings, joist hangers, and railing systems that meet California Building Code requirements.
Hayward Building Permits and Codes
Every construction project in Hayward requires a building permit from the Hayward Building Division. This includes roof replacements, siding replacement, window replacement, ADU construction, home additions, and deck building.
Hamilton Exteriors pulls all permits on your behalf. We know the Hayward permitting process, including the required inspections and documentation. Permit fees vary by project type:
- Roof replacement: $250 to $600
- Siding replacement: $150 to $400
- Window replacement: $100 to $300 per window
- ADU: $2,000 to $5,000
- Home addition: $1,000 to $4,000
- Deck: $200 to $600
These fees are included in our itemized estimates, so there are every cost itemized when the permit is issued.
Why Hayward's Location Matters for Your Home Project
Hayward sits on the eastern shore of San Francisco Bay, at the intersection of several geological and climatic zones. Here is what that means for your home:
Seismic risk. The Hayward Fault runs directly through the city. According to the U.S. Geological Survey, there is a 31 percent probability of a magnitude 6.7 or greater earthquake on the Hayward Fault within the next 30 years. Every project we do in Hayward includes seismic considerations — from proper roof-to-wall connections to structural reinforcement in additions and ADUs.
Climate. Hayward has a mild Mediterranean climate with average highs of 70 degrees in summer and 58 degrees in winter. But the city's location means it gets more fog and moisture than inland cities like Livermore or Pleasanton. This affects material choices: we recommend corrosion-resistant flashing and premium underlayment for roofs, and fiber cement siding that resists moisture better than wood.
Fire risk. While most of Hayward is not in a designated WUI zone, the nearby Oakland Hills and Berkeley Hills are. Homes in Hayward's hillside neighborhoods — particularly those near the eastern city limits — may fall into a Very High Fire Hazard Severity Zone (FHSZ) as designated by CAL FIRE. We can check your property's fire zone status during a design consultation.
How We Price Projects in Hayward
Every Hamilton Exteriors estimate is fully itemized. You see exactly what each component costs: materials, labor, permits, and cleanup. We do not give lump-sum bids that hide markups.
Pricing ranges for common Hayward projects:
- Roof replacement (asphalt shingles): $17,500 to $21,500 for a 2,000-square-foot home (Hamilton Exteriors 2024-2026 project data). Includes tear-off, underlayment, flashing, ridge vents, and permit.
- Siding replacement (fiber cement): $12,000 to $28,000 depending on home size. Includes weather-resistant barrier, flashing, and trim.
- Window replacement: $800 to $1,500 per window installed. Includes frame, glass, labor, and permit.
- ADU construction: $150,000 to $350,000. Includes design, permits, construction, and finishes.
- Home addition: $200 to $450 per square foot. Includes structural engineering, permits, and construction.
- Deck building: $30 to $80 per square foot. Includes footings, framing, decking, and railing.
These ranges assume standard conditions. Complex projects — steep hillside lots, multi-story homes, or properties requiring structural reinforcement — may cost more. We provide a precise estimate after an on-site inspection.
Get Your Free Quote for Your Hayward Home Project
Ready to start your Hayward home improvement project? Hamilton Exteriors is an architect-led design-build firm serving Hayward and all of Alameda County. Every project is backed by Alex Hamilton Li, a licensed architect and general contractor (CSLB #1078806), and our team of experienced craftsmen.
Call (650) 977-3351 or Get Your Free Quote online. We look forward to working with you.
