ADU Construction in Sacramento

An accessory dwelling unit (ADU) is one of the smartest ways to add value to a property in the Sacramento region. Whether you need space for aging parents, a place for grown kids to land, a home office, or rental income that helps cover the mortgage, an ADU adds a complete, permitted living space on the lot you already own. TDI^® has been building in Sacramento since 1983, and we manage ADU projects from the first site review to the final inspection.

Types of ADUs we build

• Detached ADUs, a standalone backyard cottage with its own foundation, kitchen, bathroom and entrance. The most private option and the most flexible for rental use.
• Attached ADUs, a new unit built onto the existing home with its own entrance, sharing a wall with the main house.
• Garage conversions, turning an attached or detached garage into a full living unit. Often the fastest and most cost-effective path to an ADU.
• Junior ADUs (JADUs), a unit of up to 500 square feet carved out of existing space inside the home, such as a primary suite or spare bedroom, with an efficiency kitchen and a separate entrance.
• Above-garage units, building a living space over a new or existing garage where the lot and local rules allow it.

How an ADU project works with TDI^®

1. Site and zoning review, We look at your lot, setbacks, existing utilities, access and the local ADU rules before anything is drawn, so the design fits what can actually be permitted.

2. Design and drawings, We coordinate floor plans and construction drawings sized to your goals and budget. Where a city offers pre-approved ADU plans, we will tell you whether one can save you time.

3. Permits and plan check, TDI^® submits the application, answers plan check comments and tracks the permit through approval. California requires local agencies to act on a complete ADU application within 60 days.

4. Construction, Foundation or slab work, framing, roofing, rough plumbing, electrical and HVAC, insulation to California Title 24 energy standards, then drywall, cabinets, fixtures, flooring and finishes. Utility connections and any required fire separation are handled as part of the scope.

5. Final inspection and walkthrough, We close the permit with the building department and walk the finished unit with you, so you get a legal, insurable, rentable space.

What does an ADU cost?

Costs vary widely with size, type, site conditions and finish level. These are typical ranges in the Sacramento area, not quotes:

TDI^® provides a written scope and a detailed estimate before any work begins, so you know what you are building and what it will cost.

Why build your ADU with TDI^®

• One licensed general contractor, CSLB License #1041773, Class B General Building, managing design coordination, permits and every trade.
• Building in Sacramento since 1983, with the experience to tie new construction cleanly into older homes and lots.
• Additions, garages and new construction under one roof, the same skills that go into every ADU.
• Clear communication, a written estimate up front, a realistic schedule and one point of contact from start to finish.

We build ADUs throughout Sacramento, Placer, Yolo, El Dorado, San Joaquin and Stanislaus counties. Thinking about an ADU? Call (916) 259-7848 or request a free estimate, and we will start with a site review of your property.