Accessory dwelling unit — Billings, MT
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
An ADU is a self-contained living space that includes a kitchen, bathroom, and sleeping area, situated on the same lot as your primary home. You need one if you require more space but want to avoid moving. Costs fluctuate based on material choices, utility upgrades, and square footage. Exact pricing confirmed free on the call.
Frequently asked in Billings
How do I find an accessory dwelling unit contractor in Billings?
What are the options for a modular accessory dwelling unit in Billings?
What is the ADU permit process in Billings?
What is the best ADU for my property in Billings?
What are the accessory dwelling unit companies in Billings?
What is the cost of an ADU in Billings?
Can I get an ADU builder in Billings?
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: North Park, Central Billings, West Billings, South Billings, The Heights — and every surrounding area.
Areas we serve
Browse by state, then city.