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Your Source for Door and Window Replacement in Arnold, MO

Since 2014, STL Windows And Doors has been serving customers in the Arnold, MO area with the best-value window and door sales and installation. Our experienced crew handles all the installation work for you. We understand that choosing a company to purchase replacement windows from can be overwhelming with the number of competing companies.

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

Our Arnold 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 simple: we will bring efficiency and beauty with our products, and provide peace of mind through careful installation and “always there” 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 Arnold, 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 partnered with the top window and door manufacturer (Provia), which builds with integrity and provides limited lifetime warranties on most of their products. We proudly offer one of the most attractive window replacement warranties in town.  Yes, we’re so confident in the quality and skill of our window and door installers that we will back up our workmanship for a full ten years from installation.  You can trust us to provide quality, value, and workmanship.


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 Arnold, 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 modern efficiency with older home styles.

Arnold home values have steadily increased 17.08% over the last 2 years which gives us confidence in the data from that homeowners can expect a return on investment of roughly 78% of window replacement cost 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 Arnold MO area. (take that Ameren and carbon footprint).

For Arnold Missouri 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 Arnold MO Homes Need New Windows

The age of homes in Arnold as been a primary reason for needing replacement windows. Overall, the architectural landscape of Arnold presents a blend of post-WWII era housing and modern building styles, reflecting the community’s history and growth as a family-friendly suburban town. Several neighborhoods in the city have homes built between 1940 and 1969 including: Maxville , Paulina Hills, Spring Forest , Byers / Wickes, Flamm City and Ten Brook. Many of these homes, while rich in character, are burdened with outdated windows, leading to the energy inefficiencies we talked about.

There are a few areas where most homes were built between 1970 to 2000: Beck, Arnold South, and Arnold West. When we get clients from these areas, they generally want an updated look vs having poor energy efficiency.  

In our experience, here 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


From Arnold, travel north on Hwy 55 to I-270 North, then go West on I-70, followed by North on Hwy 141, then left on Lakefront Drive.

Directions to STL Windows and Doors

If you need window installation (or door) across Arnold, 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 Arnold, 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 Arnold’s extreme cold and heat spells. 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.