Montana cost guide
Window replacement cost in Montana
In Montana, window replacement prices run close to the national average — whether you're in Billings, Missoula, or Bozeman. Here's what a complete, permitted job should cost, and how to tell whether the quote in your hand is fair.
Typical Montana range
$5,800 – $23,300
Replacement windows commonly run $600–$1,600 each installed.
Included at this price: Unit, installation, flashing, interior/exterior trim, and disposal.
Montana prices by project type
| Project | Montana range | Unit check |
|---|---|---|
| Insert (retrofit) replacement windows | $4,900 – $17,500 | Insert replacements commonly run $500–$1,200 each installed. |
| Full-frame replacement windows | $7,800 – $29,100 | Full-frame replacements commonly run $900–$2,000 each installed. |
| Specialty, bay, or oversized windows | $2,900 – $19,400 | Bay and picture windows commonly run $1,800–$6,000 each installed. |
Reviewed 2026. Editorial benchmarks from public cost surveys (Zonda Media / Remodeling magazine, Houzz, Angi / HomeAdvisor), adjusted by a state construction-cost index. Not a bid, appraisal, or licensed estimating data.
What a common size costs in Montana
Replacement window, installed: $600–$1,600 per window, adjusted for Montana construction costs.
| Size | Montana estimate |
|---|---|
| 5 windows | $2,900 – $7,800 |
| 10 windows | $5,800 – $15,500 |
| 15 windows | $8,700 – $23,300 |
| 20 windows | $11,600 – $31,000 |
Per-unit rate from the public cost guides cited above, multiplied by size and the Montana construction-cost index. Access, demolition, repairs, and permits can add to it — this is a benchmark, not a bid.
Red flags in Montana window replacement quotes
- Insert (pocket) versus full-frame replacement
- Manufacturer, series, glass package, and U-factor
- Flashing and sealing method at the opening
- Interior and exterior trim restoration
- Disposal of old units
Commonly missing line items: interior trim and paint restoration, exterior capping or wrap, rot repair at sills, disposal and haul-away, lead-safe practices on pre-1978 homes.
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Related cost guides
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