Modular Homes and ADUs: A Smarter Way to Build

Building in Montana is hard. The season is short, good trades are booked out, and every month a project drags on costs money. After years in construction, I've come to think modular homes and ADUs are one of the most practical answers to those problems, which is why I started Montana Spaces, my modular home and ADU company. Here's how modular works, where it fits, and where it doesn't.

What modular actually means

A modular home is built in sections inside a factory, then trucked to your land and set on a permanent foundation with a crane. It's not a mobile home. Once it's set and finished, it's a permanent house on a foundation like any other. The difference is where most of the building happens.

At Montana Spaces, a project runs in four steps:

• Plan: site feasibility, engineering and permitting
• Build: the home is built indoors in a controlled factory
• Set: delivery, crane and placement on the foundation
• Finish: utilities, on-site work and final completion

The problems it solves

The short season. In Montana, a stick-built house fights the weather from foundation to roof. With modular, the house is built indoors while your foundation and site work happen on your land at the same time. Snow doesn't stop a factory.

The labor squeeze. Fewer days of on-site framing and finishing means fewer trades to schedule on your site, which matters in a valley where good subcontractors are booked out.

Cost you can see up front. The unit has a set price before anything ships, so you're budgeting around a known number instead of a moving target. Site work, foundation, utilities and permits still have to be planned, but the biggest piece of the project is settled early.

ADUs and the new zoning code

Bozeman's new zoning code now allows accessory dwelling units on single-home lots. That opens real options: a rental that helps cover the mortgage, a place for aging parents or kids coming home, or a guest suite and office. A modular ADU is one of the fastest ways to act on that. One thing to budget for: since February 1, 2026, ADUs in Bozeman pay city impact fees, which I broke down in our cost to build guide.

What it costs

Montana Spaces lists collections starting at about $69,500 for its smaller models, with full-size homes starting around $336,600. Those are starting prices for the unit. Foundation, site work, delivery, utilities and permits come on top, and that's where a real budget gets built. Every lot is different, which is why the first step is always a site feasibility check.

Where modular fits, and where it doesn't

Modular is a strong fit for:

• ADUs and guest houses on existing lots
• Primary homes on land with good access
• Investors building rentals who want a predictable schedule and price
• Ranch, recreation and remote properties where a long on-site build is costly

It's a harder fit where a truck and crane can't reach the site, on very steep or tight lots, or when you want a fully one-off custom design. Covenants and HOA rules matter too, so check them before you plan anything.

How to start

Start with the land. Confirm zoning, utilities and access, and whether the site can take a delivery and a crane. Our land and build guide covers the due diligence. Then look at models and get a site evaluation. You can browse collections at montanaspaces.com.

Montana Spaces is my company, so I'm biased, but I'll give you a straight answer on whether modular makes sense for your lot. If it doesn't, I'll tell you that too.