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.
Missoula families outgrow their houses faster than they can afford to move, especially with what a fourth bedroom costs in the Rattlesnake or Farviews right now. An addition lets you stay on the lot you like and in the school you chose. Constructive Brothers builds additions as one continuous carpentry job: we pour the foundation on footings below frost, frame the new walls and roof to the local snow load, tie the new floor and roof into the old structure with proper flashing and ledger details, and carry the project through siding, windows, insulation, drywall and trim. The existing house stays weather-tight the whole time because we do not open the connection until the new shell is closed in.
Site conditions in the valley shape how an addition gets built. Lots near the Clark Fork and Bitterroot have high water tables and gravelly soils that call for wider footings or engineered fill, while South Hills and Grant Creek lots often slope enough to need stepped foundations. Setbacks, lot coverage and height limits vary by zoning district, so we check the rules with the city before drawing anything. Second-story additions on 1950s ranches are common and worth doing carefully: the existing walls and foundation have to be evaluated for the new load, and the roof comes off in a window of dry weather with a plan to have it dried in fast. Every addition gets a fixed-scope quote, an engineer's stamp and the same crew from footing to final.
Home additions in Missoula generally cost $275 to $450 per square foot, so a 400 square foot bedroom and bath addition lands around $110,000 to $180,000, with foundation conditions, a second-story versus ground-level build and the bathroom count driving most of the spread.
Tell us about the project. A carpenter, not a salesperson, will get back to you within one business day.
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New footings next to a 1940s foundation have to be dug below frost and, on soft valley soils, sometimes wider than the original. We match bearing elevations and pin the new stem wall to the old one so the two do not settle at different rates and crack the connection.
The giveaway on a bad addition is the roof. We match pitch, overhang and fascia depth to the existing house, tie the new rafters into the old ridge or valley with the framing the snow load requires, and flash the intersection with ice-and-water membrane and step flashing.
We build the new shell, roof it and side it before cutting the opening into your existing wall. Your family lives in a dry, heated house through the whole project instead of behind a tarp during a September cold snap.
Missoula's setback, lot coverage and height rules decide what you can build before design starts. We check your zoning district, confirm what is allowed, prepare the permit set with the engineer and handle the plan review so you are not redrawing after a rejection.
Before you spend money on drawings, we confirm setbacks, lot coverage and height limits for your parcel and look at how the addition would tie into the existing foundation and roof.
We work with your designer or a local draftsman on plans, get the structural engineering stamped, and give you a fixed-scope quote with allowances for finishes before anything is submitted for permit.
Excavation and footings go in during thawed months, followed by the stem wall, framing, roof and siding. The new shell is weather-tight before we open the wall into the existing house.
We cut the connection, blend the floors and ceilings, and run mechanical, insulation, drywall, trim, flooring and paint through both the new and the patched old space. Final inspection and walk-through close it out.
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 →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.
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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