Missouri Window Replacement & Exterior Door Installation
Energy-efficient replacement windows and quality exterior doors — professionally installed by ECI to improve your Missouri home’s comfort, security, and curb appeal.
- Family-Owned Since 1994
- Full-Service Exterior Experts
- Locally Owned & Operated
- Free Inspections & Estimates
Missouri's Trusted Window & Door Replacement Contractor
Old, drafty windows and damaged exterior doors don’t just hurt your home’s appearance — they drive up energy costs, reduce comfort, and compromise security. Missouri’s seasonal temperature extremes make energy-efficient windows and properly sealed doors especially important for year-round comfort.
At ECI: A Missouri Exterior Co., we install replacement windows and exterior doors that improve insulation, reduce energy costs, and enhance the appearance of your home. With more than 30 years of exterior experience across Missouri, our team ensures every installation is done correctly — properly sealed, level, and built to perform.
Our Window & Door Services
Replacement Windows
ECI installs energy-efficient replacement windows designed for Missouri's climate. Whether you are replacing one problem window or upgrading your entire home, our team provides precise measurements, quality products, and professional installations.
Entry Doors
Your front door makes a first impression and plays a critical role in security and energy efficiency. ECI installs quality entry doors that combine durability, security, and curb appeal.
Patio & Sliding Doors
ECI installs patio doors, sliding glass doors, and French doors — providing smooth operation, energy efficiency, and a seamless connection between indoor and outdoor spaces.
Exterior Door Replacement
From garage entry doors to back doors and side entries, ECI replaces exterior doors throughout your home with properly fitted, well-sealed, and durable options.
Window & Door Repair
When replacement isn't necessary, ECI performs targeted repairs on damaged frames, hardware, weather stripping, and seals to restore function and efficiency.
Why Missouri Homeowners Choose ECI for Windows & Doors
- Energy-Efficient Products — We install windows and doors designed to reduce heating and cooling costs.
- Precise Installations — Proper sealing, leveling, and fitting prevent air and water infiltration.
- 30+ Years of Exterior Experience — Trusted by Missouri homeowners since 1994.
- Style & Product Options — Multiple styles, materials, and finishes to match your home.
- Full-Exterior Integration — As a full-service exterior contractor, ECI ensures your windows and doors work as part of a complete, weather-tight system.
Windows & Doors FAQs
How do I know if my windows need to be replaced?
Signs that windows need replacing include drafts near the frame, difficulty opening or closing, fogging between double-pane glass, visible damage to the frame or sill, or noticeably higher heating and cooling bills. ECI offers free estimates to assess your windows.
What are the benefits of energy-efficient windows?
Energy-efficient windows reduce heat transfer, keeping your home cooler in summer and warmer in winter. This reduces the load on your HVAC system, lowers energy bills, and improves interior comfort.
How long does window replacement take?
Most window replacements are completed in one to two days depending on the number of windows and the scope of the project.
What types of exterior doors does ECI install?
ECI installs entry doors, patio and sliding doors, French doors, and general exterior replacement doors. Our team can recommend options based on your home’s style, security needs, and budget.
Can ECI replace just one window or door?
Yes. ECI can replace a single window or door or complete a full home replacement — whatever your project requires.
Does ECI install windows and doors on commercial properties?
Yes. ECI provides window and door installations for commercial buildings and multi-family properties throughout Missouri.
Upgrade Your Missouri Home's Windows & Doors Today
Improve comfort, reduce energy costs, and enhance your home’s curb appeal with professionally installed windows and doors from ECI.
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What Our Customers Say
4.9 RATING BASED ON 270+ REVIEWS
Rated by homeowners across St. Louis, Kansas City, and Mid-Missouri for honest communication and quality craftsmanship.
How It Works
Getting your project started with ECI is simple and transparent.
1. Contact ECI
Call or complete a form online to share your project or concern.
2. Inspection & Consultation
A thorough inspection, honest answers, and clear recommendations.
3. Project Proposal
Detailed scope of work, pricing, and product options.
4. Professional Installation
Quality craftsmanship with safety and attention to detail.
5. Final Walkthrough
We confirm your satisfaction and leave your property clean.
Proudly Serving Missouri
ECI: A Missouri Exterior Co. serves homeowners and businesses throughout the St. Louis Metro, Kansas City Metro, and Mid-Missouri regions, including Ellisville, Wildwood, Ballwin, Chesterfield, Kirkwood, St. Charles, O’Fallon, Wentzville, Kansas City, Lee’s Summit, Independence, Overland Park, Columbia, Jefferson City, and surrounding communities.