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ADU Construction in Santa Clara County and San Benito County

ADUs are one of the fastest-growing additions in California, and for good reason. An accessory dwelling unit adds living space, rental income, and property value, and increasingly, it's how families keep aging parents or adult children close while giving everyone their own space. BSB Construction designs and builds ADUs across Santa Clara County and San Benito County, handling the entire project and the full cost picture from the first sketch to the final inspection. Building in Hollister, Gilroy, Morgan Hill, or San Jose, you get one accountable team and transparent, line-item pricing with no surprises. Call (831) 636-2727 for a free ADU estimate.

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Years of innovation

Why ADUs Are So Popular

  • Multigenerational living: Keep aging parents or adult children close, with independence and privacy on both sides.
  • Rental income: A long-term tenant or guest unit that helps offset your mortgage.
  • Property value: A permitted, well-built ADU adds lasting value to your home.
  • Flexibility: A home office, guest house, or future caregiver suite that adapts as your family changes.
  • Aging in place: A single-level, accessible unit that lets loved ones stay near family instead of moving away.

LET US HANDLE

BUILT ON QUALITY AND TRUST

Built for Multigenerational Families

For families sharing a property across generations, the details matter. We design ADUs for comfort, accessibility, and independence:

  • Single-level, step-free layouts where needed.
  • Accessible bathrooms, wider doorways, and safety features for aging parents.
  • Private entrances, full kitchens, and separate utilities for true independence.
  • Thoughtful placement and sound separation so two households share a lot comfortably.

SMART ADU CONSTRUCTION FOR MODERN LIVING

Clear Pricing From Start to Finish

ADU sticker shock usually comes from costs nobody mentioned upfront. As a one-stop shop, we handle design, permitting, site work, build, and inspections under one roof, and we spell out the full cost before we break ground:

Consultation and estimate:

An on-site evaluation and a transparent, line-item quote with no hidden fees.

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Transparent, line-item estimate:

Every cost spelled out, including design, permits, site work, utilities, and finishes, with no hidden fees.

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Locked scope and schedule:

Clear expectations before construction starts.

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Progress updates:

We keep you informed of any decision that affects cost or timeline.

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No surprises at the end:

The number you approve is the number we build to.

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We also help you understand the variables that drive ADU cost, such as utility connections, site conditions, and whether you go detached, attached, or a garage conversion, so you can make smart budget decisions early.

Start Your ADU

Ready to add an ADU in Santa Clara County or San Benito County? We serve Hollister, Gilroy, Morgan Hill, San Jose, and the surrounding communities. Call BSB Construction to get your free estimate.

Request a Call

Frequently Asked Questions

An accessory dwelling unit is a secondary, self-contained living space on the same lot as a primary home. It can be detached, attached, or a converted garage, and includes its own kitchen, bathroom, and entrance.

They add living space, rental income, and property value, and they’re an increasingly popular solution for multigenerational living, letting families keep aging parents or adult children close while giving each household privacy and independence.

Yes. A well-designed ADU gives extended family their own space and independence while staying close. We build with accessibility and aging-in-place features in mind, including single-level layouts and accessible bathrooms.

We provide a transparent, line-item estimate up front covering design, permits, site work, utilities, and finishes, with no hidden fees. We manage the full cost from start to finish, so the number you approve is the number we build to.

Yes. We prepare submittals and pull permits across Santa Clara and San Benito counties, then schedule and coordinate every required inspection.

Detached ADUs, attached ADUs, and garage conversions, custom-designed or pre-approved, to fit your lot, budget, and goals.

Hollister, Gilroy, Morgan Hill, San Jose, and the surrounding Santa Clara County and San Benito County communities.

Call BSB Construction at (831) 636-2727 or request a call through our website for a free, line-item estimate.