Hamilton Exteriors is headquartered in Castro Valley at 21634 Redwood Rd. We are your neighbors, not a drive-in crew. Our office is minutes from every Castro Valley neighborhood, which means faster response times, easier site visits, and a team that genuinely knows the community.
Now Booking Fall 2026: Schedule Your Consultation
Roofing Contractor in Castro Valley
500+ projects
Since 2018
Up to 50-Year
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For local cost factors and planning, read our Roofing cost guide for Castro Valley.
For detailed pricing factors, use our 2026 Bay Area roof replacement cost guide.
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Customer-Service Obsessed
Responsive from consultation through project closeout
Architect and general contractor
One accountable team
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Roofing Services 
Choose the Roofing Service You Need
Roof Replacement
A full roof-system scope based on deck condition, water-control details, ventilation, material choice, permits, and cleanup.
Roof Repair
Targeted diagnosis and repair for leaks, damaged roofing, flashing failures, penetrations, and isolated storm damage.
Roof Inspection
A condition review of roofing, flashings, penetrations, drainage, ventilation, and visible deck concerns before a scope is set.
Gutters
Gutter and downspout planning tied to roof edges, drainage paths, fascia condition, discharge points, and site conditions.
Roofing Systems 
Explore Roofing Systems for Your Home
Asphalt Shingles
GAF shingle systems planned around roof geometry, ventilation, flashing, color, and applicable warranty options.
GAF Energy Solar Roofing
Timberline Solar ES 2 energy shingles coordinated with compatible Timberline roofing, electrical design, permits, and utility requirements.
Metal Roofing
Standing-seam and metal-panel options reviewed for slope, penetrations, drainage, finish, and connection details.
Tile Roofing
Clay and concrete tile systems planned around structural capacity, underlayment, flashing, drainage, and replacement access.
Torch-Down Roofing
Modified-bitumen roofing for eligible low-slope sections, planned around deck condition, drainage, penetrations, flashing, and application details.
TPO Roofing
Single-ply TPO membrane systems planned around attachment, insulation, heat-welded seams, drainage, penetrations, and edge details.
Castro Valley is unincorporated Alameda County, so all building permits go through the Alameda County Planning Department rather than a city building department. Roofing permits typically take 1 to 3 weeks. Hamilton Exteriors handles the full permit process with the county so you don't have to navigate the unincorporated jurisdiction paperwork.
Castro Valley's housing stock is predominantly 1950s to 1970s ranch-style homes on the valley floor, with newer hillside construction in Five Canyons and Palomares Hills. Ranch homes typically have low-to-moderate pitch roofs well-suited for architectural asphalt shingles. Hillside homes often feature steeper pitches and more complex rooflines that require experienced crews.
Castro Valley sits in the East Bay's warm inland microclimate. Summers reach 85 to 95 degrees, and south-facing roofs take significant UV exposure compared to foggy coastal cities. The hills above Crow Canyon and along Cull Canyon are designated fire hazard zones, requiring Class A fire-rated roofing materials and ember-resistant vent systems.
For typical Castro Valley homes between 1,500 and 2,500 square feet, a full roof replacement costs $14,000 to $38,000 depending on material and roof complexity. Asphalt shingles run $900 to $1,100 per roofing square (100 sq ft), while metal roofing ranges from $1,200 to $1,800 per square. Alameda County permit fees add approximately $400 to $1,200.
We serve every Castro Valley ZIP code: 94546 and 94552. From the Redwood Road corridor through Crow Canyon, Five Canyons, Jensen Ranch, Greenridge, and Palomares Hills, our crews are familiar with every neighborhood's rooflines, lot conditions, and access challenges.
Neighborhoods We Serve
Roofing Across Castro Valley Neighborhoods
Local planning starts with the site, neighborhood context, access, and applicable city review.
Crow Canyon
Crow Canyon homes range from 1960s ranches to newer hillside builds. South-facing slopes take heavy UV exposure, accelerating shingle granule loss. We recommend high-performance architectural shingles rated for Castro Valley's warm inland climate.
Five Canyons
Five Canyons is one of Castro Valley's newer developments with homes built in the 1990s and 2000s. Many original roofs are now reaching end of life. The hillside setting means steeper pitches and some fire zone requirements for homes bordering open space.
Proctor
Proctor neighborhood features classic 1950s and 1960s ranch homes with moderate-pitch hip roofs. These straightforward rooflines make for efficient replacements. Many Proctor homeowners upgrade from three-tab to dimensional shingles for improved curb appeal.
Palomares Hills
Palomares Hills homes sit on larger hillside lots with complex rooflines and multiple ridges. Fire zone compliance is critical here. We install Class A fire-rated materials and ensure proper ember protection at eaves and vents.
Jensen Ranch
Jensen Ranch is a well-maintained neighborhood with homes built primarily in the 1970s and 1980s. Many of these roofs are on their second or third replacement cycle. We handle multi-layer tear-offs and address any decking damage common in older installations.
Greenridge
Greenridge homes are predominantly 1970s construction with composition roofing. The neighborhood's tree canopy creates debris accumulation that accelerates wear. We recommend regular maintenance alongside quality materials rated for 30+ years.
Fairview
The Fairview area of Castro Valley includes a mix of mid-century homes and some newer infill. Roof access can be challenging on hillside lots. Our crews bring experience with tight-access properties and steep-slope safety systems.
Lake Chabot Area
Homes near Lake Chabot enjoy views but face exposure to afternoon winds and sun. Proper ventilation is essential to prevent heat buildup in attics. We install ridge and soffit venting systems alongside every roof replacement in this area.
Project Management How Hamilton Exteriors
How Hamilton Exteriors
Manages Your Roofing Project
Roof and Deck Review
We inspect the roof covering, accessible deck conditions, flashing, penetrations, ventilation, and drainage before defining the scope.
Roof System Scope
Your proposal identifies tear-off, deck repairs, underlayment, flashing, ventilation, selected GAF materials, permits, and cleanup.
Weather-Tight Installation
We coordinate dry-in, roofing installation, flashing details, ventilation, daily cleanup, required inspections, and site protection.
Warranty and Closeout
We review eligible GAF product and workmanship warranty terms, complete final checks, and provide the project closeout information.
Latest Roofing Projects
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Google rating 4.6 ★ from 47 public reviews
Roofing Project Reviews
Homeowner feedback from this type of project.
Chandra Williams
a week ago
Roof City did an excellent job on my roof. They were professional, fast, efficient, and clean. They over- delivered on their promise to do a five- star job in two days, which included all materials and permits needed. They deserve a 10 star rating 🌟 ✨ 💫🌟✨💫🌟✨💫☀️🙌🏾😀👍🏾
Abe Mendoza
a month ago
Very Satisfied with Hamilton Exteriors work replacing roof. Good price and flexible payment plans. They took care of the permits and cleanup. Great communication and response times. Highly recommend.
Ernesto Garlitos
a month ago
The team dis an excellent job on our roof. Carlos and his team are punctual, communicative and kept the worksite clean throughout the project. There was a slight delay in the beginning but the whole process felt smooth and stress free. Alex was generous enough to add in extra service worth $759. Highly recommended, honest roofing work.
Laarni yet
a month ago
They offered a reasonable price for my roof replacement, and overall I’m satisfied with the work. The main issue was that it took quite a while to finish because of the permit process. At one point, I was worried that the roofing materials left at the property might be stolen, so I texted them about it. They responded to my message right away, which I appreciated, and luckily nothing was stolen. Overall, the price was fair, they were responsive when I had concerns, and the project was completed.
Google rating: 4.6/5 from 47 public reviews
Read reviews on Google Mid Market
Roofing Costs in Castro Valley
$14,000–$38,000
Median home value in Castro Valley: $1,050,000
Prices for typical Castro Valley homes of 1,500–2,500 sq ft. Asphalt shingles: $900–$1,100 per roofing square. Metal roofing: $1,200–$1,800 per square. Alameda County permit fees: approximately $400–$1,200. Actual costs depend on home size, roof pitch, materials, and project complexity. We provide free, itemized estimates.
Get Your EstimateCompare Roofing Systems for Your Home
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| Feature | Asphalt Shingles | Metal Roofing | Tile Roofing | Torch-Down | TPO | Integrated Solar |
|---|---|---|---|---|---|---|
| Roof geometry | Sloped roofs | Sloped roofs | Sloped roofs | Low-slope roof sections | Low-slope roof sections | Compatible sloped roof sections |
| Early design review | Deck, ventilation, and flashing | Panel layout and penetrations | Structural load and underlayment | Deck, slope, drainage, and application details | Deck, insulation, attachment, and drainage | Solar access and electrical layout |
| Main coordination point | Roof-system warranty | Panel and finish details | Tile access and replacement | Membrane layers, seams, and flashings | Attachment, welded seams, and edge details | Roofing and electrical scope |
| Visual character | Architectural shingle courses | Clean standing seams | Clay or concrete profiles | Granulated or smooth membrane | Light-colored single-ply membrane | Low-profile energy shingles |
| Dedicated guide | Asphalt shingles | Metal roofing | Tile roofing | Low-slope roofing | Low-slope roofing | GAF solar roofing |
Roofing Financing
Plan Your Roof Project With Approved Credit
Financing may be available for eligible roof replacements and larger roofing projects with approved credit. During your roof consultation, we review the scope and explain current lender programs, terms, and payment timing.
Ask which current options fit your roofing project.
Call Now (650) 977-3351 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, Greater Sacramento, and the Central Valley. Our published guides cover 14 counties and 88 cities. Our Castro Valley and Sacramento offices support local estimating, permit coordination, and project planning across these regions.
How does billing and financing work?
Financing may be available for eligible projects with approved credit. Available terms depend on lender approval, project scope, and current programs. Your project manager can review the options that apply before work begins. We also accept checks, ACH, and major credit cards.
Are you licensed and insured?
Yes. Hamilton Exteriors holds CSLB License #1078806, active general liability coverage, and the required contractor bond. We also hold GAF Master Elite and James Hardie Elite Preferred credentials. We can provide current proof of coverage before work begins.
Do I need a permit for my exterior project?
Permit requirements depend on the project scope and local jurisdiction. Hamilton Exteriors coordinates required applications, plan documents, corrections, and inspections. Permit fees and allowances appear in the proposal before construction begins.
How much does a roof replacement cost in Castro Valley?
A roof replacement in Castro Valley typically costs $17,800 to $27,500 for a standard 2,000 sq ft home with architectural asphalt shingles, including tear-off, underlayment, flashing, labor, and permit fees (Hamilton Exteriors 2024-2026 project data). Metal roofs run $28,000 to $45,000, and tile roofs range from $30,000 to $55,000. Every Hamilton Exteriors estimate is fully itemized so you see exactly where your money goes.
Do I need a permit for a roof replacement in Castro Valley?
Yes. Castro Valley is in unincorporated Alameda County, and the Alameda County Building Inspection Department requires a permit for any roof replacement. Permit fees typically range from $500 to $800. Hamilton Exteriors handles the entire permit process, including application, plan submission, and scheduling inspections.
How long does a roof replacement take in Castro Valley?
A standard asphalt shingle roof replacement on a Castro Valley home typically takes 3 to 5 days from start to completion, including tear-off, underlayment, installation, flashing, and cleanup. Metal and tile roofs may take 5 to 7 days. Weather delays are uncommon during dry season but can add time during winter months.
What roofing material is best for Castro Valley homes?
For most Castro Valley homes, premium architectural asphalt shingles deliver the best balance of cost, durability, and aesthetics. They offer a 50-year system warranty, Class A fire rating, and proven performance in our Mediterranean climate. Metal roofing is an excellent choice for hillside homes in fire-prone areas, and tile suits Mediterranean-style homes if the structure can support the weight.
How do I know if I need a full replacement or just a repair?
If your roof is over 20 years old and showing widespread issues like curling shingles, granule loss, or multiple leaks, a full replacement is more cost-effective. If damage is isolated to a small area and the rest of the roof is in good condition, a repair may extend its life by 5 to 10 years. We provide a honest assessment during your on-site inspection and will recommend repair where it makes sense.
Your Next Step
Plan Your Project With a Clear Scope
Financing may be available with approved credit for eligible projects.
Tell us about your project. We usually call within 3–5 minutes to schedule the next step.
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Roofing in nearby cities
Project Planning in Castro Valley
Castro Valley is an unincorporated community of approximately 61,000 residents with roughly 23,000 housing units. Most homes were built between the 1950s and 1970s during the suburban expansion of the East Bay, meaning many roofs and exteriors are original or on their second replacement cycle.
As an unincorporated area, Castro Valley building permits are issued by the Alameda County Building Inspection Department, not a city building department. Permit processing typically takes 5-10 business days for straightforward roof replacements. Hamilton Exteriors handles all county permit applications on your behalf.
Castro Valley sits in a sheltered inland valley that experiences slightly warmer summers and cooler winters than bayside communities. The area receives about 20 inches of rain annually, and homes in the hillside areas above the valley floor face increased wind exposure.
21634 Redwood Rd Unit F, Castro Valley, CA 94546
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