What Should I Know Before Building an ADU?

Feasibility comes first

An accessory dwelling unit (ADU) is a secondary, self-contained living space on a single-family lot. Not every property qualifies — feasibility depends on zoning, lot size, setbacks, and existing structures.

Before investing in design, confirm what your property allows. We review zoning and lot conditions before recommending a path forward.

Key considerations before building an ADU

Zoning and setbacks: ADU eligibility and placement are governed by local zoning. Setbacks limit where a detached ADU can sit on the lot.

Utilities: ADUs need electrical, plumbing, and HVAC. Connecting to existing utilities may have requirements that affect design and cost.

Design: Detached ADUs, attached ADUs, and garage conversions each have different design and cost implications.

Permitting: ADUs require plans, permits, and inspections. We submit complete applications and coordinate the process — we do not promise approval.

Budget: Design, permitting, utility connections, and construction all factor into the total project cost.

ADU vs. garage conversion vs. addition

If a detached ADU isn't feasible, a garage conversion can create a self-contained unit within the existing footprint, or a home addition can expand the main house. Each has different zoning, cost, and use-case implications.

We help you compare options based on your property and goals.