Roofing
Roof inspections, repairs, and replacements planned around condition, drainage, ventilation, material choice, and permits.
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Home Remodeling Contractor in Castro Valley
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What We Build 
Available Services in Castro Valley
Siding
Exterior wall planning for cladding, weather barriers, flashing, trim, moisture damage, and required permits.
Windows
Window replacement based on opening measurements, frame condition, glass needs, flashing, efficiency, and installation method.
ADUs
Property feasibility, design, permits, utilities, and construction planning for accessory dwelling units and garage conversions.
Additions
Planning for room extensions, second stories, structural changes, building systems, permits, and construction sequencing.
Custom Homes
Site review, architecture, engineering, permits, and construction coordination for a ground-up home.
Decks
Site, structural, material, railing, access, and permit planning for new decks and major deck renovations.
500+
Projects Completed
10+
Years Experience
50yr
Warranty Coverage
4.8
Average Rating
Google rating 4.6 ★ from 47 public reviews
What Homeowners Say About Our Work
Public reviews from Northern California homeowners.
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 🌟 ✨ 💫🌟✨💫🌟✨💫☀️🙌🏾😀👍🏾
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.
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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 Castro Valley, California
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.
$1,050,000
Median home value
61,000
Population
5 minutes
From our office
Permit Authority
Alameda County Building Inspection Department · (510) 670-5400
Local Tip
Castro Valley is Hamilton Exteriors' home base. As an unincorporated community, permits go through Alameda County rather than a city building department. The county process is straightforward and we know the inspectors and requirements well from years of local projects.
Project Management How Hamilton Exteriors
How Hamilton Exteriors
Manages the Work
Itemized Scope
Your proposal identifies included work, selected materials, permit allowances, payment timing, and exclusions before construction.
Relevant Credentials
Hamilton Exteriors holds CSLB #1078806. We show manufacturer credentials only where they apply to the selected system.
Warranty Review
We explain the product and workmanship warranty terms that apply to your selected scope before work begins.
One Project Contact
One contact coordinates the schedule, field questions, inspections, and project closeout.
Serving Every Castro Valley Neighborhood
Hamilton Exteriors is headquartered in Castro Valley at 21634 Redwood Rd. We have completed projects across every neighborhood, from the valley floor to the hillside communities.
Crow Canyon
Crow Canyon's hillside homes face unique challenges from slope, fire zones, and UV exposure. We handle roofing, siding, decks, and additions designed for the terrain. Our crews know the access routes and site conditions throughout the Crow Canyon corridor.
Five Canyons
Five Canyons is one of Castro Valley's newer communities with homes from the 1990s and 2000s. Original roofs and siding are reaching replacement age. Hillside lots here are ideal for elevated decks with valley views. We work within community design standards.
Proctor
Proctor is Castro Valley's classic post-war neighborhood with 1950s and 1960s ranch homes on flat lots. These homes are prime candidates for second-story additions, garage-to-ADU conversions, and full exterior upgrades. We have completed dozens of projects on these blocks.
Palomares Hills
Palomares Hills offers larger lots and a semi-rural character. Custom homes, expansive decks, and detached ADUs take advantage of the space and views. Fire zone compliance is required for some properties. Our architect designs to the specific lot.
Jensen Ranch
Jensen Ranch is a family-oriented neighborhood with well-maintained homes from the 1970s and 1980s. Roof replacements, siding upgrades, and backyard ADUs are the most common projects here. Flat lots and good site access make for efficient construction.
Fairview
Fairview spans a range of home styles and lot configurations. From mid-century ranches to newer construction, we tailor each project to the specific property. Gentle slopes in parts of Fairview create opportunities for raised decks and split-level additions.
Greenridge
Greenridge's mature tree canopy creates a lush setting but also contributes to moisture-related exterior issues. Fiber cement siding and composite decking resist the damp conditions under tree cover. We protect significant trees during construction.
Lake Chabot Area
Homes near Lake Chabot enjoy a natural setting with recreation access. Decks, outdoor living spaces, and exterior renovations that connect the home to its surroundings are popular projects in this area.
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 general contractor cost in Castro Valley?
General contractor rates in Castro Valley typically range from $150 to $250 per hour for labor, or 10 to 20 percent of total project cost for project management (Hamilton Exteriors 2024-2026 project data). Hamilton Exteriors provides itemized estimates that break out materials, labor, permits, and overhead separately. For a typical roofing project, expect $15,000 to $35,000. For an ADU, $200,000 to $400,000. For a home addition, $250 to $550 per sq ft.
Do I need a permit for home improvements in Castro Valley?
Yes. Alameda County requires building permits for most home improvements, including roof replacement, siding replacement, window replacement, ADUs, additions, and decks. The Alameda County Building Department issues permits and conducts inspections. Hamilton Exteriors handles all permit applications for our clients.
How long does a roof replacement take in Castro Valley?
Most residential roof replacements in Castro Valley take 2 to 5 days, depending on roof size, material, and complexity. A straightforward asphalt shingle job on a single-story home may take 1 to 2 days. Tile or metal roofs, multi-story homes, and complex designs can take a week or more.
What is the best roofing material for Castro Valley?
For most Castro Valley homes, premium architectural asphalt shingles offer the best balance of cost, durability, and appearance. Metal roofing is a good choice for hillside homes where fire resistance is a priority. Tile suits Mediterranean-style homes but adds significant structural load. We help you choose based on your home's architecture, budget, and site conditions.
Does Hamilton Exteriors serve all of Castro Valley?
Yes. We serve all Castro Valley neighborhoods, from the downtown area to the hillside properties along Palomares Road and Crow Canyon Road. Our office at 21634 Redwood Rd Unit F is centrally located for quick response times.
21634 Redwood Rd Unit F, Castro Valley, CA 94546
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