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ADU Contractors near Martinez, CA
prefabADU
1111 Western St, Fairfield, CA CA 94533 19.9 milesprefabADU is a Bay Area ADU builder with 16+ years of experience offering affordable kits and plans from under $45K. With 12 state-approved plans valid across California, they simplify permits, design, and installation for homeowners.
read moreADBC Architecture
460 Mandana Boulevard, Oakland, CA 94610 14.6 milesADBC Architecture completed an 800 SF detached ADU in East Bay, CA in 2025, designed for multigenerational living. Built with thermally modified wood and steel, the backyard cottage features high ceilings and large windows for a spacious feel.
read moreAdapt Dwellings
5944 Claremont Avenue, Oakland, CA 94618 12.9 milesADUs add rental income & property value. Services include garage conversions, detached ADUs, JADUs & granny flats. ADU Feasibility Studies cover code, utilities & ROI. Architectural services via Adapt Dwellings ensure smooth approval to construction.
read moreAlpha1 Builders
3147 Dwight Road, Elk Grove, CA 95758 46.3 milesAlpha1 Builders in Elk Grove, CA specializes in ADU construction, including garage conversions, attached, detached, junior, and multi-tenant ADUs. They manage design, permitting, and build, helping homeowners add value and rental income.
read moreHilario Construction
Santa Rosa, CA 95405 42.9 milesHilario Construction is a Santa Rosa ADU contractor offering full-service accessory dwelling unit construction, including permits, design, and turnkey delivery. Serving Santa Rosa, Windsor, and Petaluma, they build detached ADUs, granny flats, and in-law suites compliant with California ADU laws.
read moreADU Builders Bay Area
111 N Market St Suite 1150, San Jose, CA 95113 45.8 milesADU Builders Bay Area specializes in detached ADUs, garage conversions, in-law suites & more. Expert ADU contractors offering transparent pricing, full permitting & quality construction throughout the Bay Area.
read moreDecor Builders
800 Charcot Avenue, San Jose, CA 95131 43.8 milesDecor Builders is a San Jose-based ADU contractor with 15+ years of Bay Area experience. They offer full-service ADU design and construction, including granny flats and in-law suites, handling permits, engineering, and project management.
read moreMetricon Homes
2010 Crow Canyon Road, Suite 100, San Ramon, CA 94583 17 milesMetricon Homes offers ADU construction and garage conversion services. Choose from 5 sizes: Marigold, Camellia, Magnolia, Dahlia, and Sunflower. Their Design to Doorstep process covers custom design to completion. Licensed contractor: Tobin Brinker, License #1128717.
read moreApex ADU Builders
10050 North Foothill Boulevard, Los Angeles, CA 95014 46.8 milesApex ADU Builders is a Los Angeles-based contractor specializing in accessory dwelling unit construction. Services include new builds, garage conversions, permitting, and design. Costs range from $80K–$400K, with potential ROI 35% higher than homes without ADUs.
read moreAnura Design
367 Civic Drive, Pleasant Hill, CA 94523 2.8 milesAnura Design specializes in ADU design, offering styles from modern farmhouse and contemporary steel to Mediterranean stucco. Their interiors feature open-concept layouts, natural wood tones, and refined finishes tailored to compact, functional living spaces.
read moreMTR
1984 Enterprise Boulevard, West Sacramento, CA 95691 48.7 milesMTR (Modern Technology Resources Inc.) offers full-service ADU design and construction in Sacramento, CA. Services include custom builds, garage conversions, permit management, and prefab options—helping homeowners add value with functional, affordable accessory dwelling units.
read moreJeff Martinez Construction
11 Susie Ct, Oakley, CA 94561 23.1 milesJeff Martinez Construction Inc. builds ADUs in Oakley, CA with 27+ years of experience. Services include detached ADUs, garage conversions, permits, finishing, and landscape integration across Contra Costa County.
read moreUrban Shore Builders
226 Delfino Avenue, Point Richmond, CA 94801 15.5 milesUrban Shore Builders offers full-service ADU design & construction, including garage conversions, detached units & additions. As a turnkey ADU contractor, they handle permits, design & build. Services include plumbing, electrical, HVAC & retaining walls.
read moreCollins Remodeling
2651 Blanding Avenue, Alameda, CA 94501 17.1 milesCollins Remodeling is a licensed ADU contractor in Alameda, CA, specializing in detached ADUs, garage conversions, JADUs, and granny flats. They manage permitting, design, and construction, helping homeowners add value and rental income.
read moreOther cities in California
- North Highlands
- Sacramento
- North Hollywood
- Agoura Hills
- Encino
- Los Angeles
- Tarzana
- Long Beach
- Hollywood
- Glendale
- Valley Village
- Pasadena
- Burbank
- Downey
- Beverly Hills
What you need to know
ADU Contractors in Martinez, CA: Building in the Heart of Contra Costa County
Martinez, the county seat of Contra Costa County, is a historic waterfront city with a rich architectural heritage and a growing demand for additional housing. As housing costs continue to rise throughout the Bay Area, ADU contractors in Martinez, California are playing a vital role in helping homeowners maximize their property value and create additional living space. With its mix of Victorian-era homes, craftsman bungalows, and mid-century properties, Martinez presents unique opportunities and challenges for ADU construction professionals.
Understanding Martinez ADU Regulations and Permitting
Before breaking ground on an accessory dwelling unit in Martinez, homeowners and contractors must navigate the city's specific zoning and building codes. Martinez follows California state ADU law while also enforcing its own local guidelines. Key regulatory considerations include:
- Zoning compliance: ADUs are generally permitted in single-family and multifamily residential zones throughout Martinez.
- Size limitations: Detached ADUs can be up to 1,200 square feet, while attached ADUs are typically limited to 50% of the primary dwelling's square footage.
- Setback requirements: A minimum 4-foot rear and side setback is required for most new detached ADUs.
- Historic district considerations: Some areas of Martinez fall within historic overlay zones, requiring additional design review to preserve the city's architectural character.
- Parking requirements: In many cases, replacement parking is not required when a garage is converted into an ADU.
Types of ADUs Built by Martinez Contractors
Experienced ADU builders in Martinez, CA are skilled in constructing a variety of unit types to suit different property layouts and homeowner needs. The most common ADU types in the area include:
- Detached ADUs: Standalone structures built in the backyard, ideal for larger lots common in Martinez's residential neighborhoods.
- Garage Conversions: Transforming existing garages into livable space, a popular and cost-effective option.
- Attached ADUs: Units added directly to the existing home, sharing at least one wall with the primary structure.
- Junior ADUs (JADUs): Units up to 500 square feet created within the existing footprint of a home.
Why Hire a Local ADU Contractor in Martinez?
Working with a licensed ADU contractor familiar with Martinez ensures your project moves smoothly through the city's Building and Planning Department. Local contractors understand the nuances of building on hillside lots, working near the Carquinez Strait waterfront, and dealing with the region's seismic requirements. They also have established relationships with local inspectors and subcontractors, which can significantly reduce project timelines and costs.
Whether you're looking to generate rental income, house a family member, or increase your property's resale value, investing in an ADU in Martinez, California is a smart long-term decision. Contact a qualified local ADU contractor today to start planning your project.