Adu Construction
Brother & Brother Builders
Accessory Dwelling Unit Construction at Brother & Brother Builders
Among the many building services offered by Brother & Brother Builders, accessory dwelling unit (ADU) construction represents one of the ways this San Jose general contractor helps property owners make the most of their land. Operating from 3109 Stevens Creek Blvd Ste A in the 95117 area, the company brings its full-service building expertise to a type of project that has become increasingly relevant across Santa Clara County, where homeowners often look to add living space, accommodate extended family, or expand the functionality of an existing lot.
How This Work Fits Into the Brother & Brother Builders Portfolio
ADU construction sits naturally alongside the broader range of work Brother & Brother Builders handles, including custom homes, new home construction, second story additions, garage conversions, and room additions. Because the company operates as a full-service building contractor, an ADU project can draw on the same design-build approach the firm applies to larger construction efforts. That means architectural services, floor plan development, and modern home design can all feed into a single, coordinated ADU build rather than being handled as disconnected pieces.
For property owners considering a secondary unit, this integrated capability matters. An ADU is not simply a small structure — it involves foundations, framing, utilities, and finish work that must meet the same standards as any permanent residence. Brother & Brother Builders approaches these units with the practical construction knowledge it has developed serving homeowners throughout the region.
What an ADU Project Involves in Plain Language
An accessory dwelling unit is a self-contained living space located on the same lot as a primary home. Depending on the property and the owner's goals, it may take the form of a detached backyard building, an attached addition, or a conversion of existing space such as a garage. Brother & Brother Builders offers garage conversion services as well, giving property owners more than one path toward adding usable square footage.
In broad terms, an ADU build can involve several stages the company is equipped to handle:
- Design and planning, supported by 3D home design tools and floor plan development to visualize the unit before construction begins.
- Architectural services that shape the layout, footprint, and relationship of the new unit to the existing home.
- The construction itself, from site preparation and framing through interior finishes.
- Interior work that overlaps with the company's remodeling services, including flooring installation, interior painting, drywall, cabinetry, and countertop work for kitchen and bathroom areas within the unit.
- Optional smart home upgrades and green building options for owners interested in energy-conscious or technology-forward features.
Because a functional ADU typically includes its own kitchen and bathroom, the same skills Brother & Brother Builders applies to kitchen remodeling and bathroom remodeling — cabinet installation, tile work, shower and vanity fitting, and backsplash installation — come into play within the unit itself.
Serving San Jose and the Surrounding Santa Clara County Communities
Brother & Brother Builders delivers this work across San Jose and neighboring communities including Santa Clara, Cupertino, Sunnyvale, Milpitas, Los Gatos, and Saratoga. The company's position on Stevens Creek Boulevard, a major commercial corridor linking San Jose to Santa Clara and Cupertino, places it within convenient reach of many residential neighborhoods where ADU projects are commonly undertaken. This central location supports the firm's ability to serve property owners across one of Silicon Valley's largest and most dynamic communities.
The West San Jose vicinity around Stevens Creek is familiar territory, near well-known destinations such as Westfield Valley Fair, Santana Row, and Westgate Center. The wider service area stretches across landmarks that define the region — from the Winchester Mystery House and the Municipal Rose Garden to Central Park, the SAP Center, PayPal Park, and The Tech Interactive. Working within these established neighborhoods, Brother & Brother Builders understands the character of local properties and the practical considerations that shape residential construction in the area.
What Distinguishes the Brother & Brother Builders Approach
The distinguishing feature of Brother & Brother Builders' ADU work is its grounding in a genuinely full-service building operation. Rather than treating an accessory dwelling unit as a stand-alone specialty, the company folds it into a design-build framework that also encompasses new home construction, home remodeling, and detailed interior finishing. A homeowner planning an ADU can therefore work with a contractor already versed in kitchen design, bathroom design, custom homes, and modern home design — the very elements that make a secondary unit livable and comfortable.
As part of the local construction landscape in Santa Clara County, Brother & Brother Builders contributes to the ongoing improvement and development of homes across the region. ADU construction is one expression of that role, helping property owners in San Jose and its neighboring cities expand what their land can offer. Those interested in learning more about the company's accessory dwelling unit services can reach Brother & Brother Builders by phone at +1 888-412-2632 or through its official website.
Getting here
From Casino M8trix
Casino M8trix sits about 5.7 miles out, or around 11 minutes by car. The route runs along Matrix Blvd to US-101 S, then over to I-880 S toward Brother & Brother Builders.
Common questions
What is the $40,000 grant in California for ADUs?
California's ADU Grant Program, administered through the state housing agency, offered eligible homeowners up to $40,000 to cover pre-construction costs such as site prep, architectural plans, permits, and impact fees for accessory dwelling units. Funding availability changes over time, so current status should be verified. Brother & Brother Builders, a San Jose general contractor handling ADU construction across Santa Clara County, works with homeowners navigating these projects.
How much does it cost to build a 1200 sq ft ADU in California?
A 1,200-square-foot ADU in California often ranges roughly from $300,000 to $500,000 or more, depending on finishes, site conditions, foundation work, and permitting in each jurisdiction. Costs in Silicon Valley tend toward the higher end. Brother & Brother Builders, based on Stevens Creek Boulevard in San Jose, provides ADU construction and design-build services for property owners throughout Santa Clara County, from Cupertino to Sunnyvale.
Is it cheaper to build an ADU or buy a prefab?
Prefabricated ADUs can carry lower base construction costs and faster timelines, but site work, foundation, utility connections, delivery, and permitting still add up, sometimes narrowing the gap with a site-built unit. Custom-built ADUs offer more design flexibility. Brother & Brother Builders, a general contractor serving San Jose, Santa Clara, Los Gatos, and surrounding communities, handles custom ADU construction, room additions, and garage conversions for local homeowners.
How much does it cost to build an ADU in San Jose?
ADU costs in San Jose vary widely based on size, whether it's detached or a garage conversion, and finishes chosen. A general contractor like Brother & Brother Builders, based on Stevens Creek Boulevard, can assess your property, site conditions, and local requirements before providing an accurate estimate. Factors like foundation work, utility connections, and permit fees all influence the final price, so an in-person evaluation is the most reliable way to budget.
Do I need a permit to build an ADU in Santa Clara County?
Yes, ADUs in Santa Clara County require permits covering building, electrical, plumbing, and often planning review to meet California's ADU regulations. A general contractor such as Brother & Brother Builders, which serves San Jose and nearby cities like Santa Clara, Cupertino, and Sunnyvale, works within these local requirements. Handling permits properly ensures your unit is legal, safe, and eligible for rental or resale down the line.
Can I convert my garage into an ADU in San Jose?
Garage conversions are one of the most common ADU approaches in San Jose because they reuse an existing structure, often reducing cost and construction time. The space must meet requirements for ceiling height, insulation, egress, and utilities. Brother & Brother Builders, a San Jose general contractor serving Santa Clara County, offers garage conversion services alongside detached ADU construction, so homeowners can compare which option best fits their lot and goals.
How long does it take to build an ADU in the San Jose area?
ADU timelines depend on design complexity, permitting, and whether you're converting an existing space or building new. Detached units typically take longer than garage conversions, and permit review adds time before construction begins. A local general contractor like Brother & Brother Builders, familiar with building in San Jose and surrounding communities such as Milpitas, Los Gatos, and Saratoga, can outline a realistic schedule once your project scope is defined.