Florissant Window and Door Replacement
STL Windows and Doors installs ProVia replacement windows and exterior doors for homeowners in Florissant, Missouri.
Florissant has the tightest permit rules of any city we work in. When it adopted the 2021 building code it amended the exemption list heavily, and it deleted the detached accessory structure exemption altogether. Retaining walls are exempt only up to two feet, where most neighbouring cities allow four. Fence repairs are exempt only if they cover a quarter or less of the total fence length.
Windows and doors are nowhere on that exemption list, so replacing them requires a permit. One small local detail while the job runs: the authorization card has to be displayed in a window facing the street, in a clear waterproof container, until the work is finished.


Florissant Window Replacement
If your home is a designated Landmark or a contributing resource in a Historic District, there is a second requirement, and a piece of logic in the ordinance that catches people out.
The code protects ordinary maintenance and repair, and then defines ordinary maintenance as any work for which a building permit is not required by law. Replacing a window in Florissant does require a permit. So it is not ordinary maintenance, the exclusion does not apply, and the Landmark and Historic District Commission has to issue a Certificate of Appropriateness first.
Florissant Door Replacement
What the Commission measures is proportion. Its review standard says the relationship of the width to the height of windows and doors shall be visually compatible with surrounding structures and the streetscape, and that the colour and texture of facade materials shall be visually compatible with what predominates around you. That is a real constraint on what you can put in an existing opening.
Two further things worth knowing. Where a Certificate is refused you can apply for a Certificate of Economic Hardship. And the design guidelines, including the colour charts and review standards, are printed and handed out whenever a permit application is received, so you are entitled to see the criteria you are being judged against.

Why Choose STL Windows & Doors
- 10-year workmanship guarantee: Every job we do is backed for a full ten years. If something isn’t right, we’ll return and make it right at no cost to you.
- In-house, factory-trained installers: Our own certified people install every ProVia product, which is what keeps the manufacturer warranty intact.
- On-time and reliable: We show up when we say we will, communicate with you throughout the job, and treat your home with care from start to finish.
- Free in-home consultations: We’ll come to your home for a no-pressure visit, measure carefully, and talk you through the real options, with no hidden fees.
- BBB Accredited Business: Accredited under our Earth City address, where the rating and the complaint record can both be read in full.
What Do Florissant Customers Say?
These are Google reviews from our customers, quoted exactly as they were written. Our full Google profile and our Better Business Bureau record are both public, so read the rest of them rather than taking our word for anything on this page.
★★★★★
Tom was my installer. He was very thorough and professional. The windows look great!!!! Thanks Tom
Steven Moore
Google review
★★★★★
I can't say enough good things about this company and their professionalism. From the first meeting with Rob to the final clean up of the job, everything was great. Tony and his crew got here on time and worked efficiently all day. It's nice to finally find a company that really cares about not only their job, but their customers as well. I highly recommend them.
Glenn Bailey
Google review
★★★★★
Hannah, Tony and Trey came out and installed all new windows and sliding patio door. The team was very personable and professional. They took the time to answer any questions I had and also went the extra mile to work through options specific and unique to my house. I really appreciated this attention to detail and care for the final product. I was referred this company and will 100% be referring in the future. Thanks!
Chad Kreutz
Google review
Landmarks, Certificates and the Ordinary Maintenance Trap
There is an obligation running the other way as well. Owners of Landmarks and contributing resources have to keep them free of listed defects, and broken windows are named specifically. If the Building Commissioner serves notice by certified mail you have thirty days to put it right, extendable for good cause.
Outside the Landmark and Historic District designations none of the Commission process applies, and it is an ordinary permitted job. Establishing which side of that line your address falls on takes one look-up, and it is where every Florissant quote should start.
On price there is no single figure per window, because it moves with size, style, glass package and the number of openings. Our Window Replacement Buyers Guide sets out what actually drives it, and financing is available if you would rather spread the cost.
Every installation carries our 10-year workmanship warranty and the limited lifetime transferable product warranty on the ProVia units. The crew is ours, which is what lets us take a Certificate application through and know it will match what actually gets fitted.

Design, Order, Install, Inspect
Our Simple But Proven Process
Talk with a Pro
Give us the address and we will check whether it is a Landmark or a contributing resource before anything else is discussed.
Onsite Assessment
We measure every opening and record the width to height proportion of each one, because that is the standard the Commission applies.
Deliver Your Estimate
You get an itemised estimate, and where a Certificate is needed, a schedule that includes the Commission step instead of ignoring it.
Get a Free Quote
Ready to find out what new windows or doors would cost for your home? Request your free estimate today.
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.






















