Detached ADU
A separate backyard living unit. Review available space, access, utilities, setbacks and foundation conditions before choosing a layout.
Accessory dwelling units / South Bay
ADU construction, planned around your property.
A backyard cottage, an attached unit or a garage conversion starts with the same question: what can the property support? R&B Master Construction Inc. can review the proposed scope, discuss the construction process and confirm fit before proceeding.
Choosing a direction
Three ADU options to consider.
Attached ADU
An accessory unit connected to the main home. Evaluate how the structure, roof, building systems, entrances and privacy will work together.
Garage conversion
An existing-space conversion where property conditions and regulations permit. Confirm structural, energy, fire and utility needs before committing to a budget.
From property to construction
A clearer path to your ADU.
Property review
Identify the parcel, existing buildings, access, utilities, prior permits and available site information. Project eligibility is not assumed without a property review.
Design and construction scope
Decide the type of unit, approximate floor area and interior priorities. Coordinate drawings, structural design, building systems and scope responsibilities.
Permits and approvals
Confirm the current state and city requirements, application documents, responsible applicant and inspection stages before scheduling work.
Construction planning
Discuss site work, foundations or conversion work, framing, connections, finish allowances, access, schedule dependencies and an itemized proposal.
Regulations and property conditions
Use current ADU rules.
California's Department of Housing and Community Development updated its ADU Handbook in March 2026. State law, local processing, building codes and property conditions must be considered together. Do not assume that an example unit size or plan is approved for your lot.
Before you begin
Questions about ADU construction.
Every home is different. Let’s talk through the details of yours.
Can I put a detached ADU in my San Jose backyard?
Possibly. The answer depends on the parcel, applicable state and local regulations, existing improvements, utility capacity and site conditions. Confirm eligibility and permitted size through the appropriate city process.
Is a garage conversion an option?
Some existing garages can be converted into an ADU. Building structure, utilities, life-safety requirements and the applicable approval process need review first.
How much does an ADU cost?
The cost varies substantially by size, site conditions, design, foundations, utility connections, permit requirements and finishes. A proposal requires a defined scope and review of the existing property.
Who handles ADU drawings, permits and inspections?
These responsibilities must be confirmed in the project agreement. A contractor can coordinate qualifying building work while the local agency determines permit and inspection requirements.
Begin a conversation
A new beginning.
Let’s talk.
You don’t need to have it all figured out. Tell us where you are with your project, and we can discuss the next step.
(650) 800-9661info@rbmasterconstruction.comServing homeowners in the San Francisco Bay Area.