Single Hung Windows in St. Louis
installed by your local window contractor with 25+ Years of Reliable Window Installation Services
Energy-efficient single hung fiberglass windows expertly installed in St. Louis for lasting comfort, beauty, and peace of mind.
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Beautiful, Durable Single Hung Windows for Your Home
Upgrade your home with stylish, energy-efficient single hung windows from Replacement Windows By Lakeside. Enjoy long-lasting performance, enhanced curb appeal, and exceptional service from a local team you can trust.
Lifetime Workmanship Warranty
You can rely on us for excellence in quality, value, and craftsmanship.
- We have an A+ Rating with the Better Business Bureau
- Hundreds of reviews combined with our full exterior company, Lakeside Renovation & Design
- All of our in-house contractors are licensed and insured
- We provide Lifetime Workmanship Warranty on top of Infinity by Marvin’s product warranty
- We offer financing options to work with your budget
A Simple Window Upgrade That Solves Everyday Frustrations
If your current windows are hard to open, drafty, or outdated, it may be time for a change. Single hung windows are a timeless, space-saving solution that provides beauty, functionality, and energy savings in one sleek package.
At Replacement Windows By Lakeside, we specialize in helping St. Louis homeowners solve the frustration of inefficient, deteriorating windows. Whether you’re renovating a bathroom or refreshing your entire home, our Infinity by Marvin single hung fiberglass windows offer lasting quality and peace of mind.
Why Homeowners Choose Replacement Windows By Lakeside
Choosing the right window company matters just as much as choosing the right windows. Homeowners trust us because we focus on listening first, installing right the first time, and respecting your home throughout the process.
- Locally owned and operated since 1997
- In-house installation crews — never subcontractors
- Daily project updates through an online homeowner portal
- No-pressure, transparent estimates with no pricing games
- Lifetime workmanship warranty plus manufacturer’s warranty
Get Classic Design and Modern Performance with Single Hung Windows
Single hung windows feature two sashes, with the bottom sash opening vertically while the top remains fixed. This design provides reliable ventilation, efficient operation, and a clean, timeless appearance — making it a popular choice for bedrooms, bathrooms, and areas where space matters.
Available Styles & Customization Options
- Clean, traditional profiles with narrow sightlines
- Custom grille patterns and finishes
- Easy-tilt sashes for simpler cleaning
- Energy-efficient glass options
Features That Set Our Windows Apart
We install Infinity by Marvin fiberglass windows, engineered for long-term durability and consistent performance. Built with Ultrex® fiberglass, these windows resist warping, rotting, and fading far better than traditional vinyl or wood.
- Excellent thermal performance for year-round comfort
- Smooth, dependable operation
- Low-maintenance materials that won’t rot, peel, or fade
The Real Benefits Homeowners Experience
Before replacement:
- Drafts and uncomfortable temperature swings
- Windows that stick, jam, or won’t stay open
- Higher heating and cooling costs
- Frames that look worn or outdated
After replacement:
- Improved comfort and quieter living spaces
- Lower energy bills year-round
- Easy operation with minimal upkeep
- A home that feels refreshed, efficient, and enjoyable again
Frequently Asked Questions about Window Replacement
What makes Replacement Windows by Lakeside a trusted St. Louis window contractor?
- We have been St. Louis’s exclusive Infinity by Marvin authorized contractor since 2006.
- We maintain a lifetime workmanship warranty in addition to the manufacturer’s warranty.
- Our installation is handled by factory-trained, in-house specialists, not subcontractors.
How far does your service area extend around St. Louis?
We serve the greater St. Louis metro area, including both eastern Missouri and parts of Illinois.
If your specific city isn’t listed, you can contact us — often we can still serve your area.
What warranties and guarantees come with my new windows?
- You receive a lifetime workmanship warranty from Lakeside in addition to the manufacturer’s warranty.
- Because we are an Infinity by Marvin authorized contractor, your installation meets their standards — guaranteeing the manufacturer warranty.
What factors influence the cost of replacing windows in St. Louis?
- Window size, configuration, and complexity
- The frame material and finish you choose (fiberglass vs vinyl or wood-like interior finishes) will impact price.
- Extra customizations like decorative hardware, grille patterns, and unique configurations add cost.
- Structural issues uncovered during installation (rot, damage) can require additional repair work. We always discuss with homeowners before proceeding.
Do you offer financing or special payment options for windows in St. Louis?
- Yes, we offer flexible financing plans through GreenSky
- We also have monthly special offers to help your project come to life
What is the window installation process when working with your team?
- We begin with precise measurements to ensure a custom fit.
- Our installers use polyurethane non-expanding foam (not expanding foam) for insulation, avoiding frame deformation.
- We seal each window with quality sealants to ensure air- and water-tightness.
- We finish with interior trim or reuse existing trim if it’s in good shape, then perform a final walkthrough.
For more details on our installation process, see our blog “What to During the Window Installation Process“
What styles and types of windows do you install in St. Louis homes?
We install Infinity by Marvin windows in a variety of styles; such as double hung, casement, and bow windows (to name a few).
Our windows are custom fit, and you can choose various operating styles, hardware, colors, finishes, and grille options.
When should I replace my windows rather than repair them?
- Signs like air leaks or drafts, condensation between panes, or difficulty opening/closing windows indicate it’s time.
- If your energy bills are steadily rising and windows are old or inefficient, replacement may give a better ROI.
- Older windows that are warping, rotting, or structurally unsound typically can’t be cost-effectively repaired.
See our “Replacement Window Guide” for in-depth information on when to replace your windows!
Why choose fiberglass (Infinity by Marvin) windows instead of vinyl or wood?
- The Ultrex® fiberglass used in Infinity windows is eight times stronger than vinyl and resists warping, bowing, and deterioration.
- Fiberglass has low thermal expansion (closer to glass), making seals more durable and less prone to failure.
- These windows are more energy efficient (Low-E coatings, argon gas fills) and offer long‑term performance with minimal maintenance.
Will replacing my windows lower my energy bills in St. Louis?
- Yes — poorly insulated or leaky windows allow heat transfer. Upgrading to energy-efficient windows can reduce heating/cooling costs.
- Our Infinity by Marvin windows come with Low-E coatings and argon fills, which help block heat gain/loss.
How Much Does It Cost to Install Single Hung Windows?
The cost of replacing single hung windows depends on several factors. Rather than using one-size-fits-all pricing, we provide clear, personalized estimates so you know exactly what to expect.
Factors that influence cost include:
- Window size: Larger windows require more materials and labor
- Window material: Fiberglass offers long-term value and durability
- Window style: Grilles, finishes, and glass options impact pricing
- Installation complexity: Second-story windows, tight access, or custom openings may add labor
While fiberglass windows are an investment, their longevity, energy efficiency, and low maintenance deliver lasting value and peace of mind.
Get Stress-Free Window Installation with Our Precise and Personalized Process
We value transparency just as much as you do. To ensure there are no surprises along the way, here’s exactly what you can expect during casement window installation with our local team—from start to finish.
First, we’ll meet for a consultation, where we’ll learn your replacement goals and help you select the perfect configurations, finishes, and hardware.
Next, our team will come out to take precise measurements before custom-ordering your windows. We pride ourselves on doing the job right—the first time.
It’s installation day! Our in-house team will complete your window installation, taking extra precautions to ensure the safety of your home and family.
During the final walkthrough, we’ll explain the warranty coverage for your new windows, which includes our lifetime workmanship warranty.
A Window Upgrade You Can Feel Confident About
With expertly installed single hung windows from Replacement Windows By Lakeside, you gain comfort, efficiency, and confidence in your home — without the stress homeowners often expect from remodeling projects.
Ready to replace your windows with a solution built to last? Contact us today to schedule your free consultation.
Special Offer
12 Months, No Interest/No Payments*
No interest until Fall of 2027!*
Don’t make a payment until Fall of 2027*
Executed contract date range: 9/1/26 – 9/30/26
