Modular 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
These units are built in a factory setting and then transported to your property for final assembly. This option is often chosen to reduce construction time and minimize disruption to your neighborhood. The final price is influenced by transport logistics, site preparation, and the level of customization. Exact pricing confirmed free on the call.
Frequently asked in Billings
What does 'accessory dwelling unit' mean in Billings?
How do I get an ADU estimate in Billings?
Are there accessory dwelling unit builders near me in Billings?
What are the best accessory dwelling units for my property in Billings?
Can I build an accessory dwelling unit on my property in Billings?
What are the requirements for homes with in-law suites in Billings?
What is involved in ADU building 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, South Park, Skyview, Lewis and Clark, Hilltop — and every surrounding area.
Areas we serve
Browse by state, then city.