Local research · updated July 2026
Replacement Windows in St. Louis, Missouri
St. Louis has one of the oldest housing stocks in the country: about 85.9% of its roughly 174,000 units were built before 1980, some 101,000 predate 1940, and the median home dates to 1938. That means block after block of the classic St. Louis brick house — solid-masonry two-flats and gingerbread-trimmed homes still carrying their original wood double-hung sashes, many single-pane and painted through decades of use. Set that stock against a mixed-humid climate that also delivers hard hail and severe thunderstorms, and window replacement here is less about style than about failing sashes, deferred maintenance, and weighing storm resistance alongside efficiency.
Short answer
In St. Louis, a standard replacement window (double-hung, casement or slider) typically costs $535–$3,030 installed. Bay and bow windows run $2,665–$8,515+, and a sliding patio door $1,600–$5,320. Frame material and the glass package decide where a project lands in that range.
Planning ranges built from NREL and BLS cost data, localized to St. Louis with the BEA Regional Price Parity for St. Louis, MO-IL (2024). How we estimate →
85.9%
of St. Louis homes were built before 1980, the era of single-pane and early aluminum windows
Source: U.S. Census Bureau, 2019–2023 ACS 5-Year Estimates
1938
median year built across St. Louis's 173,920 housing units
Source: U.S. Census Bureau, 2019–2023 ACS 5-Year Estimates
SHGC ≤ 0.4
the ENERGY STAR v7.0 number that matters most in the North-Central zone
Source: EPA ENERGY STAR v7.0
Window installers in St. Louis
Compare companies serving St. Louis. Request a free, no-obligation quote and we route it to the company or a vetted local installer.
| Company | Location | Request a quote |
|---|---|---|
 4.8 · 200,000+ reviews | Bridgeton, MO | Get a quote → |
| 1Champion Replacement Windows of St. LouisChampion | Fenton, MO | Get matched → |
| 2Mad City Windows & Baths of St. LouisMad City Windows | Saint Charles, MO | Get matched → |
| 3Pella Windows and Doors Showroom of Chesterfield, MOPella | Chesterfield, MO | Get matched → |
| 4Universal Windows Direct of St LouisUniversal Windows Direct | St. Louis, MO | Get matched → |
| 5Window NationWindow Nation | Bridgeton, MO | Get matched → |
| 6Window World of St. LouisWindow World | Earth City, MO | Get matched → |
Renewal by Andersen
4.8 · 200,000+ reviewsBridgeton, MO showroom · serving the St. Louis metro
Full-service manufacturer and installer, transferable warranty, local crews. Why it's our Top Pick
Get a quote →Listings compiled from manufacturer dealer locators and public business records. Premier and Sponsored Partners pay for placement and are labeled as such; star ratings shown are reported by the partner, with the source and date beside them. See our advertising disclosure. Contacting a company shares your details with it (or a vetted local installer) so it can reach you about your project.
Are you a window company? Claim your listing to take quote requests from St. Louis homeowners directly.
What drives window decisions in St. Louis
- Pre-war homes commonly have original wood double-hungs set into solid-brick openings, where decades of paint, swelling, and worn sash cords are as much the problem as the single-pane glass itself.
- St. Louis has a strong preservation culture and numerous locally designated historic districts, so on many older blocks the character of the window — sash profile, muntin pattern, materials — is a real consideration, and district properties may face design review.
- Missouri sees frequent large hail and severe storms, so impact-rated or laminated glass is worth pricing on exposed elevations, especially if your home has taken hail damage before.
- The mixed-humid climate brings both hot, humid summers and freeze-thaw winters, so a balanced glass package — moderate solar control plus solid insulating performance — matters more here than optimizing for one season alone.
Replacement windows & doors by type in St. Louis
Local cost ranges and North-Central-zone efficiency guidance for each window and door style, specific to St. Louis homes:
Ranges localized to St. Louis's cost level: national planning ranges shifted by the BEA Regional Price Parity for St. Louis, MO-IL (95.1, U.S. = 100; 2024). How we estimate local costs →
Efficiency requirements for St. Louis's climate
St. Louis sits in the ENERGY STAR North-Central zone (IECC zone 4A (mixed, moist), St. Louis City). Under the v7.0 specification, qualifying windows need a U-factor of 0.25 or lower and an SHGC of 0.4 or lower. Mixed climate: good insulation matters most, with a moderate cap on solar gain so summer cooling costs stay in check.
Not sure what these numbers mean? Read our plain-English guide to U-factor and SHGC.
What replacement windows cost here
The age of the stock is the biggest cost driver in St. Louis: openings in homes built before 1940 are often out of square, and original wood frames may be rot- or moisture-damaged, which pushes jobs toward more labor-intensive full-frame replacement rather than a simple insert. Solid-brick masonry openings can add complexity compared with wood-framed walls. Laminated or impact-rated glass, worth considering given the region's hail exposure, adds cost over a base insulated unit, as do larger or historically profiled sashes. Bids tend to span a wide range, so get more than one and confirm whether each quote is for an insert or a full-frame replacement, since the two are not directly comparable.
For a breakdown by frame material and install type, see our full cost guide.
Rebates & incentives in Missouri
The federal window tax credit (25C) ended for projects placed in service after December 31, 2025. If your windows were installed in 2025, you can still claim it on your 2025 return — but for new projects there is no federal window credit. State and utility programs are now the main source of window incentives.
Missouri's IRA Home Energy Rebate rollout has lagged — verify current status with the state before promising rebate money. Utility programs are the more reliable near-term path.
- Ameren Missouri / Evergy efficiency programs. Missouri's major utilities — Ameren Missouri (St. Louis) and Evergy (Kansas City) — run home efficiency and weatherization programs; window measures typically qualify within a broader whole-home project. (Ameren Missouri, Evergy program pages)
Missouri has no statewide energy code; St. Louis and Kansas City adopt and enforce their own codes based on the IECC. Storm-prone areas should weigh impact-rated glazing alongside efficiency.
Replacement windows in nearby metros
Not in St. Louis proper? These nearby markets carry the same local research: housing-age data, climate-zone specs, and current rebate status for each city:
St. Louis window replacement FAQ
›Do I need a permit to replace windows in St. Louis?
Often no. In the City of St. Louis, replacing existing windows and frames without modifying the opening is generally treated as an ordinary repair and does not require a residential building permit. If the work alters the size or shape of the opening — or involves structural changes — a permit through the City's Building Division is typically required. Properties in locally designated historic districts may also need design review regardless of permit status. Confirm your specific situation with the City of St. Louis Building Division and, for historic properties, the Cultural Resources Office.
›Are impact- or hail-resistant windows worth it in St. Louis?
They can be, depending on your exposure. Missouri regularly sees large hail and severe storms, and laminated or impact-rated glass resists breakage better than standard insulated units. It costs more up front, so it makes the most sense on elevations that have been hit before or are otherwise exposed. Before paying for it purely to save on insurance, ask your carrier directly whether impact-resistant openings qualify for a premium credit, since not all policies offer one and terms vary.
›What efficiency numbers should replacement windows hit in St. Louis?
St. Louis is in the ENERGY STAR North-Central climate zone. Under ENERGY STAR version 7.0, the North-Central target is a U-factor of 0.25 or lower and a solar heat gain coefficient (SHGC) of 0.40 or lower. In this mixed climate both figures matter — the U-factor for winter heat retention and the SHGC for limiting summer solar gain. Look for the ENERGY STAR label and check the NFRC ratings to verify the numbers on the specific product you are quoted.
›Are there tax credits or incentives for windows in Missouri?
The federal 25C energy-efficient home improvement credit for windows expired December 31, 2025, so that route is no longer available. Missouri's rollout of the federally funded Home Energy Rebates has lagged, so as of now the more reliable path is utility programs — Ameren Missouri for electric service and Spire for natural gas both run residential energy-efficiency programs in the St. Louis area. Whether windows specifically qualify, and for how much, changes over time, so check directly with your utility before counting on any incentive.
Sources
- — U.S. Census Bureau, American Community Survey 5-Year Estimates (B25034, B25035)
- — EPA ENERGY STAR Version 7.0 Residential Windows specification
- — DOE/PNNL IECC climate zone assignments by county
- — NOAA NCEI Storm Events Database; Insurance Information Institute
- — IRS, 25C Energy Efficient Home Improvement Credit (P.L. 119-21)