Last updated: September 24, 2026
What affects the price
Building an ADU is a major project, and the final bill depends on a few key things. Site prep is a big factor; if your land is sloped or needs extensive utility connections, costs go up. The materials you choose—from siding to kitchen finishes—also change the math significantly. Whether you’re building a detached unit or converting an existing garage shifts the permit requirements and structural work needed. We provide exact pricing confirmed free on the call.
About this service
This involves using your secondary unit as a source of monthly income by leasing it to tenants. You might consider this if you want to offset your mortgage or capitalize on high local demand for smaller housing. Success depends on local rental laws and how well the unit is designed for privacy. Exact pricing confirmed free on the call.
Frequently asked in Billings
What are the disadvantages of building a detached accessory dwelling unit in Billings?
What goes into ADU construction in Billings?
What is the cost to build an accessory dwelling unit in Montana?
Where can I find an ADU near me in Billings?
What are the different types of ADU housing available?
ADU housing comes in several forms. The most common are detached units, like backyard cottages, and attached units, such as basement apartments or in-law suites. Conversions of existing structures, like garages, are also popular options. The best choice depends on your property's layout and local zoning regulations in Billings.
What is the best ADU for my property in Billings?
What are the requirements for an accessory dwelling unit permit cost in Montana?
Also serving nearby: Salt Lake City · West Valley City · Sandy · West Jordan · Fort Collins
More on this: HUD ADU resources — ADU policy and financing research.
Service area details
Serving all of Billings — population 120,864; about 2,652 residents per square mile across 45.6 sq mi. ZIP codes covered include 59101, 59102, 59103, 59104, 59105, 59106, 59107, 59108.
Neighborhoods served in Billings: Downtown Billings, West Billings, South Billings, North Park, Heights — and every surrounding area.
Areas we serve
Browse by state, then city.
