Cost of replacement window installation — St. Louis, MO

Last updated: September 24, 2026

What affects the price

Replacing windows is a custom job, so your final bill depends on a few specific variables. The size and style of the window frames—like double-hung versus large picture windows—play a big role. Choosing energy-efficient glass coatings or adding decorative grids can also shift the total. We also look at the condition of your existing frames and whether the installation requires structural repairs to the surrounding wall. Your exact pricing is confirmed free on the call.

About this service

The investment required for new windows is influenced by the condition of your existing frames and the style of window you select. If your existing frames are rotted or damaged, a full-frame replacement will be necessary, which is more involved than a standard retrofit. Because of these variables, projects typically start in the hundreds per unit. We prioritize transparency so you know exactly what is included in your upgrade. Exact pricing confirmed free on the call.

Frequently asked in St. Louis

Also serving nearby: O Fallon · Springfield · Columbia · Champaign · Peoria

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More on this: DOE window guidance — install vs replace decisions.

Service area details

Serving all of St. Louis — population 281,754; about 4,565 residents per square mile across 61.7 sq mi.

Neighborhoods served in St. Louis: The Hill, Central West End, Tower Grove, Soulard, Benton Park — and every surrounding area.