Serving Our Local Communities For Over 40 Years
LongCo Window & Door is the culmination of nearly 50 years of dedicated service to our customers in the remodeling industry. Birthed from Long Siding and Construction, the company my father started in 1971, we’ve grown and evolved over the years into a company that is now completely focused on the new and replacement window and door business. Our approach is simple, but in today’s world still unique, an intense devotion to service and satisfaction for our customers, offering top caliber products at reasonable cost, and installing these products with the best American craftsmen we can employ. We follow the golden rule, we’re dedicated to God-Family-Country, and we truly believe that this mindset allows us to offer the best dedicated service to you, our customers.
Your satisfaction is our passion.™
Our philosophy is to take an extra 15-20 minutes a day to make the right decision rather than cutting corners. Because of this, we have earned the reputation for exceeding industry standards time and time again. Our level of work, craftsmanship, ethics, and professionalism are all reflected in our A+ Rating by the Better Business Bureau (BBB).
Our Guarantee
Our installers are craftsmen, experts at installing the most innovative windows and entryways on the market. We know how to add value, beauty, functionality, and energy efficiency to your home. We are proud to offer every customer fair prices for top-of-the-line products from exclusive American window and door manufacturers.

- 100% Customer Satisfaction Guarantees
- Free Estimates and Quotes (for all projects)
- Lifetime Labor Warranty (on all services)
- Manufacturer’s Warranties (on all product lines)
Our team is ready to get to work for you! Call our St. Louis window and door specialists or email today and request your completely FREE estimate to get started on your next project.
