Double-Hung Windows
A familiar choice for traditional homes, double-hung windows combine a classic appearance with operable upper and lower sashes. Available features vary by product, including tilt-in designs that can simplify cleaning.
St. Louis Windows & Doors
Window & Door Replacement in St. Louis, MO
A More Beautiful Home.
A Better Everyday Experience.
Bring more light into the rooms you love. Replace the front door that never quite closes right. Give your home a finished exterior that feels intentional from the street to the backyard.
ECI: A Missouri Exterior Co. helps St. Louis homeowners plan window and exterior door replacement around the details that matter: appearance, comfort, operation, and the condition of the opening itself. From a focused replacement project to a coordinated exterior renovation, we help you understand the options and define the work before installation begins.
Replacement Windows • Entry Doors • Sliding & French Patio Doors
Design inspiration. Images are illustrative; available products and project details vary.
Family Owned & Operated | Privately Owned Since 1994 | Not Franchised | Not Private Equity
Design inspiration. Images are illustrative; available products and project details vary.
Designed Around Your Home
The Right Windows and Doors Change More Than the View.
Windows and doors shape how your home looks, how each room feels, and how easily you move through the day. When they become difficult to operate, show deterioration, or no longer fit the home’s appearance, replacement deserves a closer look.
A successful project starts with more than choosing a frame color. The existing opening, surrounding materials, installation approach, glass package, hardware, and finishing details all influence the result.
ECI brings windows and doors into the larger exterior conversation. We consider how the proposed work relates to your brick, siding, trim, and adjacent exterior details so the finished project feels coordinated.
A More Finished Exterior
Coordinate frame colors, door finishes, glass patterns, and trim with the character of your home.
Better Everyday Function
Plan around ventilation, ease of operation, entry access, and the way your household uses each space.
An Informed Investment
Understand product choices, installation scope, and project variables before deciding how to move forward.
Replacement Windows
Window Replacement That Fits the Way You Live.
Some rooms need a clearer view. Others need better ventilation, easier operation, or a window style that complements the home’s architecture.
For window replacement in St. Louis, the right starting point is the existing condition of your home and what you want the project to accomplish. ECI evaluates the openings, discusses your priorities, and helps define suitable replacement options.
Your evaluation can address:
- Windows that stick, bind, or will not stay open.
- Drafts around the sash or frame.
- Fogging or moisture between panes.
- Deteriorated sills, frames, or surrounding trim.
- Water staining near the opening.
- Broken or unreliable locking hardware.
- A dated appearance or inconsistent window styles.
- A planned replacement across several rooms or the entire home.
Not every concern requires full replacement. Some problems involve maintenance, hardware, indoor humidity, or water entering from an adjacent exterior detail. The evaluation helps distinguish the visible symptom from the work that may be needed.
Find the Right Window Style for Every Room.
The best-looking window should also make sense for the room. Consider the view, ventilation, furniture placement, exterior access, and how the window will be operated.
Casement Windows
Side-hinged windows open outward using a crank or similar operator. Their clean lines suit many architectural styles, and their operation can be useful above sinks or other locations where reaching a sash is awkward.
Sliding Windows
Sliding windows open horizontally and can work well in wider openings. Their straightforward design offers a broad view without requiring a sash to swing into an exterior space.
Picture Windows
Fixed picture windows emphasize daylight and the view. They do not open for ventilation, but they can be paired with operable windows when both a large view and airflow are priorities.
Bay & Bow Windows
Projecting window arrangements can create a distinctive architectural feature and a wider viewing angle. Replacement planning should account for support, roof or head details, insulation, and the condition of the surrounding structure.
Specialty & Architectural Windows
Arched, geometric, and other distinctive shapes can preserve or enhance a home’s character. Dimensions, glass choices, and compatibility with surrounding windows should be reviewed before selection.
Styles, dimensions, finishes, and operating features depend on the selected product and the requirements of your home.
Design inspiration. Images are illustrative; available products and project details vary.
Choose the Details You Will Notice Every Day.
Window selection involves more than white versus black. Frame proportions, interior finishes, grille patterns, screens, hardware, and glass choices all contribute to the finished appearance.
Material options to discuss may include vinyl, fiberglass, wood, or clad-wood products, depending on availability and project suitability. Compare the maintenance expectations, appearance, and performance of the actual product rather than relying on the material name alone.
For traditional brick homes, a thoughtful selection can preserve visual character. For newer homes, consistent frame colors and clean trim details can bring the whole exterior together.
Design considerations
- Interior and exterior frame colors.
- Grille patterns that complement the architecture.
- Sightlines and the amount of visible glass.
- Hardware finishes and operating features.
- Privacy glass where appropriate.
- Screen options.
- Interior casing and exterior trim.
- Compatibility with the surrounding brick or siding.
Comfort and Performance
Understand the Glass. Compare the Whole Window.
Energy-efficient replacement windows can help improve comfort, but performance depends on the product, installation, existing conditions, and the home as a whole.
When reviewing product options, look beyond terms such as “premium glass” and compare the documented ratings.
U-Factor
Measures how readily heat passes through the window assembly. A lower U-factor indicates better insulating performance.
Solar Heat Gain Coefficient
Describes how much solar heat passes through the window. The appropriate balance depends on climate, sun exposure, shading, and the room’s needs.
Low-E Glass
Low-emissivity coatings help manage heat transfer through the glass. Coating choices and glass packages vary by product.
Whole-Unit Performance
Compare ratings for the complete window assembly. Glass-only figures do not describe the performance of the entire installed unit.
Where ENERGY STAR certification is relevant, verify the specific product’s certification for the applicable climate zone. Certification belongs to qualifying products; it should not be presented as an ECI installer credential.
New windows do not guarantee a particular utility-bill reduction. We encourage homeowners to weigh comfort, appearance, operation, and documented product performance together.
Design inspiration. Images are illustrative; available products and project details vary.
Entry Door Replacement
Make Your Front Door Worth Coming Home To.
Your entry door is one of the most visible features of your home—and one of the most frequently used.
A replacement should look right from the street, feel substantial in daily use, and work with the existing entry. ECI helps you consider the door, frame, threshold, weatherstripping, glass, hardware, and surrounding finishes as a complete opening.
Design choices to discuss include:
- Solid-panel and decorative-glass entry styles.
- Fiberglass and steel door options.
- Wood-look textures and painted finishes.
- Sidelights and transoms where suitable.
- Privacy and decorative glass.
- Coordinated handles, hinges, and lock finishes.
- Swing direction and entry clearance.
- Interior casing and exterior trim.
A beautiful door also needs a suitable opening. If the existing frame is deteriorated, the threshold is damaged, or water has affected surrounding materials, those conditions should be addressed in the proposed scope.
Connect Indoor and Outdoor Living
Open Up the Space Between Home and Backyard.
A patio door should make the transition to your deck, patio, or outdoor living area feel easy. The right configuration balances natural light, usable floor space, access, and the view.
Sliding Patio Doors
Sliding designs provide broad glass areas without requiring a swinging door panel inside the room. When comparing options, consider the operating panel, track, rollers, screen, handle placement, locking features, and threshold.
French & Hinged Patio Doors
Hinged patio doors can create a distinctive architectural connection to the outdoors. Planning should account for swing clearance, furniture placement, exterior landing space, and how one or both panels will operate.
For Either Style
The opening dimensions, surrounding wall condition, drainage details, and selected door system influence installation. We discuss those factors before defining the work.
Design inspiration. Images are illustrative; available products and project details vary.
The Details Behind the Finish
A Good Product Deserves a Thoughtful Installation Plan.
The appearance of a new window or door matters. So do the details concealed around it.
An installation scope should explain what is being removed, what will remain, how the new unit will fit, and how the opening will be finished.
Insert Window Replacement
An insert replacement may be appropriate when the existing frame is suitable to remain. This approach places a new unit within the retained frame, which can reduce disturbance to some surrounding finishes. Frame condition and the effect on visible glass area should be discussed.
Full-Frame Window Replacement
Full-frame replacement removes the existing frame and allows a more comprehensive approach to the opening. It may be appropriate where deterioration, installation concerns, or design changes require broader work. Trim, siding, masonry interfaces, and restoration needs should be included in the scope.
Additional installation considerations
- Accurate measurements and opening assessment.
- Support, fastening, and alignment appropriate to the product.
- Flashing and water-management details suited to the wall.
- Insulation and air sealing around the opening.
- Preservation of intended drainage paths.
- Interior and exterior finishing.
- Hardware adjustment and operating checks.
- Cleanup and removal of agreed debris.
Concealed damage may become visible after removal. If additional work is needed, the condition, recommended response, and price implications should be reviewed before that added work proceeds.
Window and Door Replacement for St. Louis Brick Homes.
Brick homes are a defining part of St. Louis. Their window and door openings deserve careful attention to proportion, surrounding masonry, and the way water moves across the wall.
A new unit should be evaluated in relation to the existing sill, lintel, trim, sealant joints, and adjacent brickwork. Cracked mortar, displaced masonry, or recurring staining may indicate a concern that window replacement alone will not resolve.
ECI’s broader exterior and masonry services make it possible to discuss related conditions in the same project conversation. Where additional masonry, siding, or trim work is recommended, it should appear as a clearly defined part of the proposal.
For homes with historic designation or association requirements, confirm applicable approvals before finalizing changes to style, material, dimensions, or exterior appearance.
Design inspiration. Images are illustrative; available products and project details vary.
Is It Time to Replace Your Windows or Doors?
01
You Feel Air Moving Around the Opening
Drafts can involve weatherstripping, alignment, perimeter sealing, or broader opening conditions.
02
The Glass Looks Foggy Between Panes
Persistent moisture between panes can indicate an insulated-glass seal problem. Evaluate whether glass-unit replacement or broader replacement is appropriate.
03
Operation Has Become Difficult
Sticking sashes, dragging doors, unreliable locks, and repeated adjustment problems deserve evaluation.
04
Frames or Trim Show Deterioration
Soft wood, peeling finishes, staining, or visible damage may require work beyond the replacement unit.
05
Water Appears Near the Opening
Water can enter through the unit or from surrounding exterior details. Identify the likely source before assuming a new window will solve the problem.
06
The Exterior No Longer Feels Cohesive
A planned replacement can coordinate mismatched windows, dated doors, and aging trim as part of a broader improvement.
Water showing up indoors? Read about exterior leaks and water problems.
Plan With Clarity
What Affects Window and Door Replacement Cost?
A meaningful estimate starts with the actual opening and the work required to finish it properly.
Two proposals can list the same number of windows and still describe very different projects. Compare the actual product, installation method, finishing scope, and treatment of unexpected conditions.
ECI’s goal is to give you a project scope you can understand and evaluate.
Project pricing can be influenced by:
- Number and dimensions of windows or doors.
- Standard versus specialty configurations.
- Frame material, glass package, and finish.
- Entry-door glass, sidelights, or transoms.
- Hardware and operating features.
- Insert versus full-frame window installation.
- Interior trim and exterior finishing.
- Access and height.
- Existing frame or surrounding wall deterioration.
- Required approvals and related exterior work.
- Disposal and cleanup included in the agreement.
From First Conversation to a Finished Opening.
- 1
Tell Us About Your Project
Share your address, the windows or doors you are considering, the concerns you have noticed, and your preferred timing.
- 2
Evaluate the Existing Conditions
We review the visible condition of the openings and surrounding materials and discuss your priorities.
- 3
Compare Suitable Options
Review styles, finishes, operating features, and installation approaches that fit the project.
- 4
Define the Scope
Your proposal should identify the selected products, agreed installation work, finishing details, and relevant project conditions.
- 5
Coordinate the Work
After approval, confirm measurements, ordering requirements, access, and scheduling.
- 6
Review the Completed Project
Review the agreed work, operation, finishing, cleanup, and applicable product care or warranty documentation.
Product lead times, scope, weather, and opening conditions affect scheduling, so we confirm timing once the scope is defined.
Plan the Improvements. Explore the Payment Options.
Whether you are replacing several windows, updating the front entry, or planning a larger exterior renovation, start with a clear understanding of the project.
Ask ECI about financing options for your proposed window and door work and explore the existing financing resources available through our website.
Explore FinancingFinancing availability and project eligibility must be confirmed. Loan terms and credit approval are determined by the lender.
Family Ownership. Personal Accountability.
Your Home Deserves a Company You Can Reach.
ECI: A Missouri Exterior Co. is a second-generation, family-owned company, privately owned since 1994.
We believe homeowners should understand the proposed work, know who to contact, and feel comfortable asking questions before making a decision.
With roofing, masonry, and exterior services under the ECI name, we can discuss how a window or door project relates to other visible exterior concerns. Each recommended service should have a clear purpose and an understandable scope.
Local Perspective
Recommendations that consider your property, its architecture, and the work you want to accomplish.
Coordinated Exterior Planning
A practical conversation about surrounding brick, siding, trim, and water-management details.
Clear Project Communication
Understand product choices, scope, scheduling considerations, and the next step.
Independent Family Ownership
Not franchised. Not private equity. A family-owned company serving Missouri property owners.
Built on Integrity. Backed by Experience.
Serving St. Louis and Surrounding Missouri Communities.
Planning window or exterior door replacement in St. Louis? Contact ECI to confirm service availability for your address and discuss the project.
We welcome inquiries from St. Louis City, St. Louis County, and surrounding Missouri communities, including:
Ballwin • Ellisville • Chesterfield • Wildwood • Manchester • Kirkwood • Webster Groves • Creve Coeur • Maryland Heights • Town and Country • Des Peres • St. Charles • St. Peters • O’Fallon • Wentzville
Availability depends on the property location and project scope. For projects elsewhere in Missouri, contact our team to confirm coverage.
Local Office
16260 Westwoods Business Park
Ellisville, MO 63021
Window & Door Replacement Questions, Answered.
Can I replace only a few windows?
Yes, a project can be evaluated around selected openings rather than assuming the entire home needs replacement. Consider the condition of the remaining windows, visual consistency, and whether completing the work in phases fits your priorities.
Do I need insert or full-frame replacement windows?
That depends on the condition of the existing frame and the goals of the project. An insert may be suitable when the retained frame is sound. Full-frame replacement may be appropriate when deterioration, installation concerns, or design changes require more extensive work.
Will replacement windows lower my energy bills?
They may help improve energy performance and comfort, particularly when replacing poorly performing units. Results vary with the selected product, installation, existing windows, insulation, air leakage elsewhere, and household use. A specific savings amount should not be assumed.
Does condensation mean my window has failed?
Not always. Moisture on the room-facing glass can relate to indoor humidity and glass temperature. Persistent moisture between panes can indicate an insulated-glass seal problem. The location and pattern of the condensation matter.
Can you replace windows in a brick house?
ECI can evaluate window replacement in brick homes and discuss the surrounding sill, lintel, trim, and masonry conditions. The proposal should identify any related work needed beyond the window unit.
Which is better: fiberglass or steel entry doors?
Both may be suitable, depending on the specific product and your priorities. Compare appearance, finish maintenance, glass options, exposure, warranty terms, and the complete door assembly rather than selecting by material alone.
Should I choose a sliding or French patio door?
Sliding doors do not need a swinging panel’s floor clearance. French or hinged doors offer a different architectural appearance and operating arrangement. The right choice depends on the opening, furniture layout, outdoor landing, and access needs.
Can a new window fix a water leak?
Only if the replacement scope addresses the actual source. Water near a window may involve the unit, flashing, surrounding wall, masonry, siding, or another adjacent detail. Evaluate the cause before selecting the repair.
How long does replacement take?
Timing depends on the number of openings, selected products, ordering requirements, installation method, weather, and existing conditions. Ask for a project-specific schedule after the scope is defined.
Do replacement windows and doors come with warranties?
Warranty coverage varies by manufacturer, product, and installation agreement. Review the written terms, including glass, hardware, finishes, labor, exclusions, and transferability where applicable.
Can windows and doors be coordinated with siding or masonry work?
Yes, related work can be discussed during the evaluation. Coordinating the sequence can help clarify trim, finishing, and opening details. Each service should be identified in the agreed scope.
How do I start?
Complete the evaluation form or call 314-996-9486. An ECI team member will contact you to confirm the property, discuss the project, and arrange the next step.
Your Next Chapter Starts at Home
More Light. A Better Entrance.
A Home That Feels Finished.
Tell us which windows or doors you want to improve. ECI will help you understand the existing conditions, explore suitable options, and define the next step.
Design inspiration. Images are illustrative; available products and project details vary.