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Your Source for Door and Window Replacement in FLORISSANT, MO

Since 2014, STL Windows And Doors has served homeowners in the Florissant, MO area with best-value window and door sales and installation by our experienced crew. We know that buying replacement windows in Florissant is cluttered with dozens of companies to choose from.

To be a contender in this competitive market, we focus on giving homeowners what matters most: a great price from someone they can trust, backed by a history of 5-star reviews, a solid warranty, and the best selection of energy-efficient styles.

Our Florissant Clients Love Our Professional Installation Service!

Our priority is to exceed industry standards and customer expectations. For the past decade, we have offered the best installation service for replacement windows and exterior doors. We guarantee you’ll always be treated like our family, with respect and close personal attention.

Our promise is clear: to bring efficiency and beauty through our products and peace of mind through meticulous installations and unwavering support. Experience the difference in a team dedicated to creativity and tried-and-true techniques in every project.



Get To Know Us

We’re a family-owned and operated window and door contractor serving Florissant, MO, and surrounding cities. Founded by Andrew Lombardozzi, a carpenter by trade, Andy has over 15 years of windows and doors installation experience. We have recruited the best skilled and dedicated men and women to form the STL Windows and Doors team.

We’re Accredited and Highly Rated

As a Platinum ProVia dealer & certified installer, we have proven our commitment to consistent quality. Homeowners who seek quality products turn to STL Windows and Doors.

A Rating with Angie's list
HomeAdvisor Top Rated
HomeAdvisor Elite Service Provider 100% Recommended
A+ Rating with BBB
EPA Lead Safe Certified
NARI Member
  • In-house, factory-trained installers
  • An impressive selection
  • Proven track record
  • Removal of old windows
  • 10 Year workmanship warranty
  • Free in-home consultations
  • Unrivaled beauty
  • On-time, friendly, and reliable staff
10 Year Workmanship Guarantee

10-Year Workmanship Warranty

We have partnered with Provia, the top window and door manufacturer, known for their integrity and limited lifetime warranties. Our window replacement warranties are one of the most attractive in town. We are confident in the quality and skill of our window and door installers, and we back up our workmanship for a full ten years from installation. You can trust us to provide quality, value, and workmanship and be around to support our clients long into the future.


We’re proud to offer the best in value windows and doors.

Replacement Windows

Our highly trained window installation pros have years of expertise in energy-efficient replacement window projects. Whether vinyl or wood-clad vinyl, we take great pride in our workmanship and carefully treat each customer’s home from start to finish.

Window Types

  • Double Hung
  • Casement & Awning
  • Sliders
  • Picture
  • Hopper
  • Garden
  • Bay & Bow
  • Architectural


We offer professional-grade vinyl, fiberglass, steel entry, storm, and patio doors that meet top industry standards for durability, security, energy savings, and style. Our doors are completely customizable in size, finish, hardware, and design to match your vision.

Door Types


Check Out PROJECT PHOTOS FROM Around Florissant, MO

Design, Order, Install, Inspect



Talk With Pro

Through a free, no-obligation estimate, you’ll share your needs with a professional who will, in turn, set up a time to meet with you in your home.



While onsite, we’ll answer questions, show you many sample products, and take all the necessary measurements to assemble an estimate.



With all the details in hand, we’ll draft, polish & deliver a thorough competitive estimate, including transparent pricing & installation details.



We’ll work excellently to complete the job on time & within the budget, respecting your home & family while installing at the highest level of quality.

All The Benefits Of Replacing Your Windows

According to EnergyStar “Heat gain and heat loss through windows are responsible for 25%–30% of residential heating and cooling energy use.” We have found that upgrading our clients to energy-efficient windows boosted comfort, reduced their energy bills by 9 to 13 percent, and blended their home’s historic charm with modern efficiency.

Florissant, MO home values have been steadily increasing by 22.06% over the past 2 years. This gives us confidence in the data provided by, which suggests that homeowners can expect to recoup approximately 78% of the cost of window replacement when they sell their home. If you are replacing single pane or drafty windows, it’s estimated you could save between $101 and $583 on energy bills with an average of $265 in the Florissant MO Region. (take that Ameren and carbon footprint).

For Florissant residents, it appears that for the year 2024, a small $1200 tax credit is still available. ($250 per door max $500), (windows max $600) and home energy audits ($150).

Common Reasons Homes in 63031 Need New Windows

Florissant is one of the oldest settlements in the state, its architectural landscape ranges from historic French and Spanish influence to modern homes built in the 2000s. Now in 2024, most homes have outdated window technologies that leave residents paying way too much in energy costs.

Neighborhoods that still have outdated windows and homes near 100 years old include Paddock Forest, Parc Argonne Forest, Villages at Jost Farm, Wellington II & III, Afshari Estates South, Wedgewood Green, Boardwalk, Paddock Hills South, Gardenview, and Misty Ridge.

The newer neighborhoods have fewer problems with energy efficiency but with the higher resale value, home buyers are looking for higher grade windows than the builder grade used 25 years ago. These neighborhoods include Old Jamestown, Villages at Barrington Downs, Manors Portland Lake Estates and Afshari Estates.

In our experience, these are the top signs that indicate it’s time to replace your outdated or failing windows:

If your current windows use old tech and lack multiple Low-E coatings, heat can pass through the glass – forcing your HVAC system to work harder. Upgrading to Energy Star-rated double-paned windows provides better insulation.

Foggy glass or condensation between window panes indicates failing seals and the loss of argon gas. Allowing excess moisture buildup can lead to rot, mold, and significant structural issues over time. We’re ready to assist with practical solutions.

Modern window technology effectively helps dampen unwanted outside noise pollution. If you currently hear a lot of street noise, replacing it with advanced noise-reducing windows will restore peace and quiet back into your home.

Over years of use, window mechanisms can begin sticking or not working smoothly. Installing new replacement windows can restore effortless and reliable functionality, ensuring ease of use.

Indoor-Drafts from broken window seals

Dated, cheaply made, or improperly installed windows allow airflow to pass around weather stripping, causing a breeze or noticeable change in interior temperature.

Schedule a free inspection to have us inspect your windows. A window specialist will give an honest opinion if you need simple repairs or if it’s time to invest in replacement windows.

Contact Us

Opening Times:

Monday 9:00 AM–4:00 PM
Tuesday 9:00 AM–4:00 PM
Wednesday 9:00 AM–4:00 PM
Thursday 9:00 AM–4:00 PM
Friday 9:00 AM–4:00 PM
Saturday Closed
Sunday Closed

Call (314) 277-5952


We’re 15 minutes away from Florissant, going west on I-270, then west on I-70, then north on Hwy 141.

Directions to STL Windows and Doors

If you need window installation (or door) across Florissant, count on us to deliver a satisfying experience replacing your windows and doors.

  • Affton
  • Arnold
  • Augusta
  • Ballwin
  • Barnhart
  • Brentwood
  • Bridgeton
  • Cedar Hill
  • Chesterfield
  • Clayton
  • Concord
  • Cottleville
  • Crestwood
  • Creve Coeur
  • Dardenne Prairie
  • De Soto
  • Defiance
  • Des Peres
  • Earth City
  • Ellisville
  • Eureka
  • Fenton
  • Festus
  • Flinthill
  • Ferguson
  • Florissant
  • Foristell
  • Frontenac
  • Glencoe
  • Gray Summit
  • Grove
  • Hazelwood
  • High Ridge
  • Hillsboro
  • House Springs
  • Imperial
  • Kirkwood
  • Labadie
  • Ladue
  • Lake Saint Louis
  • Lemay
  • Lowry City
  • Manchester
  • Maryland Heights
  • Mehlville
  • New Melle
  • O’Fallon
  • Oakville
  • Old Monroe
  • Olivette
  • Overland
  • Pacific
  • Pevely
  • Richmond Heights
  • Saint Albans
  • Saint Charles
  • Saint Louis
  • Saint Peters
  • South County
  • St. Paul
  • Sunset Hills
  • Town and Country
  • Troy
  • Union
  • Valley Park
  • Villa Ridge
  • Warrenton
  • Warson Woods
  • Washington
  • Webster Groves
  • Weldon Spring
  • Wentzville
  • Wildwood
  • Winfield

Common Questions

Here are some frequently asked questions about fiberglass entry doors.  If you have other questions, please get in touch with us!

The average window replacement cost in Florissant, MO, ranges from $500 to about $1,500 per window, with an average of $800. It all depends on the type of window you are interested in. We suggest premium-grade Provia windows that resist the extreme cold and heat spells in Florissant. You may see quotes based on United Inches of Glass, but installation costs are more related to the quantity of the window frames installed. It is best to use our free estimate for an accurate price quote.

Most experts agree that you will benefit by replacing all your windows at once if you have the budget. If your home is older than 20 years old, it may be time to start budgeting for a complete window replacement in your home.


When you’re ready, request a quick and free quote for replacement windows or doors by scheduling a no-cost consultation with a window and door replacement specialist.

The fine print:

* Cash Discount. All discounts apply to MSRP costs. Discount available once per residence per term. No adjustments can be made on prior sales. Subject to qualifying credit approval. Mention the deal at the time of scheduling your free in-home consultation.