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How much does window replacement cost in Longmont, CO?

Regionally adjustedUpdated Prices checked October 20262 sources

In Longmont, window replacement typically runs $3,290 to $11,350, about $7,050 for a typical job. That is the US national range from HomeAdvisor ($3,436 to $11,838) adjusted by the Mountain factor of 0.96 from the 2025 Cost vs. Value Report. Checked October 2026.

Adjusted for the Mountain region

Low
$3,290
Typical
$7,050
High
$11,350

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Window replacement cost in Longmont, CO

Each row says exactly what the figures are and where they come from.

Window replacement cost in Longmont, CO
EstimateLowTypicalHighBasisChecked
Mountain estimate$3,290$7,050$11,350National range × 0.96: the Mountain / national cost ratio for “Window Replacement | Vinyl” ($21,165 vs $22,073) in the 2025 Cost vs. Value ReportOctober 2026
US national range$3,436$7,348$11,838Per project (several windows): typical range of customer-reported projects (HomeAdvisor)October 2026

What drives the cost of window replacement

  1. Number of windows

    Per-window prices drop on larger projects.

  2. Window size and type

    Picture, bay and skylight windows cost more than standard double-hung.

  3. Glass

    Double or triple panes, Low-E coatings and gas fill add cost.

  4. Frame material and brand

    Vinyl, wood, fiberglass and aluminum frames are priced differently.

  5. Replacement or new opening

    New openings need framing and siding work.

Permits and what's included in Longmont

Permit note

Like-for-like replacements often need no permit, but new or enlarged openings usually do. Check with your building department.

Rules are set locally; confirm with Longmont’s building department.

What’s usually included

  • New windows
  • Removal of the old windows
  • Installation, flashing and sealing

Scopes vary. Get the scope in writing on every quote.

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Top-ranked window installers in Longmont

The top 3 of 396 window installers we rank for Longmont, CO, by CR Score. Paid placement never changes rank.

  1. #1
    One Clear Choice Garage Doors
    CR Score 634.9from 1,117 Google reviews
  2. #2
    BlueBird Windows & Doors
    CR Score 624.9from 624 Google reviews
  3. #3
    Renewal by Andersen Window Replacement
    CR Score 614.7from 357 Google reviews

See all ranked window installers in Longmont

Window replacement cost in Longmont: questions

How much does window replacement cost in Longmont, CO?

In Longmont, window replacement typically runs $3,290 to $11,350, about $7,050 for a typical job. That is the US national range from HomeAdvisor ($3,436 to $11,838) adjusted by the Mountain factor of 0.96 from the 2025 Cost vs. Value Report. Checked October 2026.

Why is the Longmont price different from the national price?

The 2025 Cost vs. Value Report puts the “Window Replacement | Vinyl” project at $21,165 in the Mountain division against $22,073 nationally, a factor of 0.96. We apply that factor to the national range. It is a division-level adjustment, not a Longmont price survey.

Do I need a permit for window replacement in Longmont?

Like-for-like replacements often need no permit, but new or enlarged openings usually do. Check with your building department. Rules are set locally, so confirm with Longmont’s building department.

What affects the cost of window replacement?

Number of windows: per-window prices drop on larger projects. Window size and type: picture, bay and skylight windows cost more than standard double-hung. Glass: double or triple panes, Low-E coatings and gas fill add cost. Frame material and brand: vinyl, wood, fiberglass and aluminum frames are priced differently.

How many window installers serve Longmont?

We rank 396 window installers for Longmont, CO by CR Score. Get at least three written quotes for the same scope.

What is usually included in the price?

New windows; Removal of the old windows; Installation, flashing and sealing. Always get the scope in writing on the quote.

Sources

Checked October 2026. Figures are estimates, not quotes.

  1. HomeAdvisor: Window installation cost · page updated June 17, 2026 · checked October 2026Primary source. Used for: Low, typical and high; drivers.
  2. Journal of Light Construction: 2025 Cost vs. Value Report: Window Replacement, Vinyl · page updated 2025 · checked October 2026Used for: Regional adjustment ratio.
  3. Journal of Light Construction: 2025 Cost vs. Value Report, Mountain division · checked October 2026Used for: Regional factor 0.96 for “Window Replacement | Vinyl”.
These are published estimates with a documented regional adjustment, checked October 2026. They are not quotes. Typical range shown: $3,290 to $11,350. Editorial policy

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