Detached ADUs, garages with living space above and workshop garages built on Missoula lots under the new state and city rules, framed for snow load and finished so they appraise well and pass inspection without drama.
Montana and the City of Missoula now allow accessory dwelling units up to 1,000 square feet on most residential lots, which has turned the backyard of a University District or Slant Streets house into some of the most valuable buildable ground in town. An ADU can house a parent or a long-term renter whose rent covers a real share of the mortgage. Constructive Brothers builds them as a complete job: foundation, framing, roof, siding, windows, insulation, drywall, kitchen, bath and trim, with licensed trades for the electrical, plumbing and mechanical. Because the same carpenters frame and finish, a 600 square foot unit goes from footing to occupancy on one schedule with one point of contact.
Garages get the same attention. A detached two-car garage in Missoula needs footings below frost, a slab with proper reinforcement and a roof framed for the snow that slides off it, and a garage with an apartment above adds fire separation, egress and stair requirements that have to be designed in from the start. We build workshop garages with 10-foot walls and 9-foot doors for the truck and the raft trailer, carports for lots where a garage will not fit the setbacks, and conversions of existing garages into ADUs where the slab and framing are sound. Each project comes with a fixed-scope quote, the permit and utility coordination handled, and a crew that shows up until the certificate of occupancy is issued.
A detached ADU in Missoula typically runs $200,000 to $350,000 depending on size, utility runs and finish level, while a detached two-car garage runs $40,000 to $85,000 and a garage with a finished suite above runs $180,000 to $300,000.
Tell us about the project. A carpenter, not a salesperson, will get back to you within one business day.
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The 1,000 square foot cap, setbacks, height limits and parking rules for ADUs in Missoula are specific and recently changed. We design to what is actually allowed on your lot and confirm it with the city before you pay for drawings.
An ADU needs water, sewer and power, and how they get there decides a big piece of the cost. We work out whether to tap the main house or run new services, coordinate with Missoula Water and the utility, and trench once.
A garage with a suite above needs a 5/8-inch Type X drywall separation, rated door and a compliant stair, along with a roof and floor sized for Missoula's snow. We build those details in during framing rather than retrofitting them when the inspector asks.
An ADU that is going to be rented needs durable finishes: LVP floors, quartz or laminate counters, a tile or acrylic shower and a heat pump mini-split that handles both January and smoke season. We spec for the tenant you will actually have.
We confirm your zoning, setbacks, lot coverage and utility access, then tell you what size and placement the rules allow and roughly what it will cost before you commit to design.
We work with a local designer on a permit-ready set, get the structural stamped, and submit to the City of Missoula or Missoula County. You get a fixed-scope quote with finish allowances at the same time.
Utilities get trenched, footings and slab poured, and the structure framed, roofed and sided by our crew. On a garage this is most of the job; on an ADU it is the halfway point.
Mechanical rough-in, insulation, drywall, kitchen, bath, flooring and trim follow, each inspected in turn. We close out with the final inspection and the certificate of occupancy so the unit can be legally rented.
Based in Missoula. One crew and one standard of work from Frenchtown to Hamilton, up the Blackfoot and over to Seeley Lake.
Carpenters who frame additions, garages, ADUs and full remodels from the mudsill up, sized for Missoula snow loads and detailed so the framing inspection is a formality rather than a fight.
Learn more →Bedroom additions, second stories, primary suites and mudroom bump-outs for growing Missoula families, built on frost-depth footings, tied into the existing structure correctly and finished so the seam between old and new disappears.
Learn more →Full residing and targeted exterior repair for Missoula homes: LP SmartSide, James Hardie fiber cement and cedar over a proper drainage plane, plus rotted trim, fascia, soffit and window flashing fixed by carpenters who know where the water got in.
Learn more →Free on-site walkthrough. A fixed-scope quote in writing. Work that passes inspection the first time.
Send us a few photos and a rough idea of the project. You will get a real number from a real carpenter, usually within one business day.
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