Attached ADU Construction in San Jose, CA
An attached ADU is an addition built onto your existing home — sharing a wall, but with its own separate entrance, kitchen, and bathroom. It's a strong middle ground between a compact JADU and a fully detached backyard unit.
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Attached ADU in San Jose
Attached ADU projects in San Jose typically run $150,000–$300,000, depending on square footage, foundation work, and how much of the existing structure needs modification to accommodate the addition. Because the unit shares a wall with your home, we design rooflines, siding, and window placement to match the existing structure so the addition looks intentional, not bolted on.
We manage the full process — architectural design, structural engineering where needed, San Jose Municipal Code 20.30.150 permitting, and construction. Attached ADUs are a good fit for lots where a fully detached unit doesn't have room, or where you want the new unit close to the main house for family proximity.
Every project begins with a free site visit to confirm what's buildable given your home's existing footprint, setbacks, and any shared-utility considerations.
Can an attached ADU share utilities with my main house?
It can, though a fully separate meter is often preferable for a rental unit. We'll go over the tradeoffs — cost, code requirements, and long-term flexibility — during your free consultation.
Licensed & insured California general contractor
Design, San Jose permitting, and construction handled in-house
Free, no-obligation on-site consultation
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Ready to add an ADU, garage conversion, or in-law suite? Text us for a free, no-obligation consultation and estimate anywhere in San Jose & Santa Clara County.
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