Replacement Windows
St. Catharines
Energy-Efficient Window Replacement, Done Right
Windows, Doors, and Siding professionally installed by Great Northern Home Exteriors — with clear communication, reliable scheduling, and results built to last.
- Trusted in Niagara since 2009
- Professional installation team
- Clean work, respectful service
Trusted & Top-Rated Across Niagara
Professional Vinyl Window Installation in St. Catharines
Vinyl windows are a smart upgrade for homeowners looking to improve energy efficiency, durability, and year-round comfort.
Modern vinyl systems use advanced thermal units that help reduce heating and cooling costs throughout Niagara’s changing seasons.
From full-frame replacements to retrofit installations, every project is completed with precision, clean finishing, and long-term performance in mind.
- Energy-efficient comfort
- Clean, finished appearance
- Designed for Niagara homes
Precision, Consistency, and Results You Can Rely On
The difference is in the details. These are the standards applied to every GNHE project.
Experienced Installers, Proven Results
Every installation is completed with attention to fit, finish, and long-term performance — not shortcuts or rushed work.
- Detail-focused installation
- Proper fit & alignment
- Clean, finished appearance
Quality Over Shortcuts
We focus on doing the job properly the first time — using installation methods that protect your home and enhance curb appeal.
- Full-frame options available
- Custom aluminum capping
- Thorough site clean-up
Consistency & Accountability
Each project follows the same installation standards and quality checks — ensuring dependable results from start to finish.
- Consistent installation standards
- Clear quality checks
- Reliable long-term performance
Reputation Built on Trust
Homeowners choose GNHE for clear advice, quality products, and installation standards that perform well in Niagara’s climate.
- A+ BBB accreditation
- High-performance Canadian-made options
- Real local support — no call centers
- Clear communication & honest service
A Simple, Professional Process — Done Right
Consultation & Assessment
We start by understanding your home, your goals, and your concerns. You’ll get honest recommendations — never pressure, never upsells.
Precise Measurement & Planning
Every opening is carefully measured and evaluated to ensure proper fit, smooth operation, and long-term performance.
Clear Quote & Next Steps
You receive a detailed, easy-to-understand quote with clear options. No surprises — just straightforward pricing and a clear path forward.
Maximize Home Efficiency with ENERGY STAR® Certified Windows
When planning a window replacement project, choosing energy-efficient options can improve comfort, reduce drafts, and support long-term savings.
ENERGY STAR® certified windows help lower energy use, improve indoor comfort, and support stronger resale appeal.
Popular Window Styles & What They’re Great For
Casement Windows
Maximum ventilation and tight seal.
Double Hung
Classic look with airflow control.
Single Hung
Simple, cost-effective design.
Tilt Sliders
Easy cleaning and everyday use.
Single Sliders
Clean horizontal operation.
Awning
Ventilation even during rain.
Bay & Bow
Adds space and architectural detail.
Picture Windows
Uninterrupted views and light.
ENERGY STAR® certification helps homeowners compare energy-efficient products.
Get Your Free St. Catharines Window Quote
Clear options. Professional installation. No pressure.
- Trusted by Niagara homeowners since 2009
- Retrofit & full-frame installation options
- Clear pricing and reliable follow-through
Local Experts Since 2009
A long-standing Niagara company with real roots and a consistent local reputation.
In-House Install Crews
Dedicated crews who focus on precision, respect your space, and finish properly.
No-Pressure Sales Approach
Clear options and honest guidance so homeowners can decide comfortably.
5-Year Workmanship + Lifetime Warranty
Long-term protection that supports your investment beyond installation day.
Ontario Window & Door Rebate Program
Receive up to $100 rebate for each ENERGY STAR® certified window or door (opening), including double- and triple-pane models. Note: Replacing existing ENERGY STAR-certified products does not qualify.
- Homeowners must replace at least three windows or one door or one sliding door to qualify.
- Homeowners may receive up to $600 toward the required home energy assessment, reimbursed after the final audit.
- Eligible homes must use Enbridge Natural Gas or electric heating connected to the Ontario grid.
- A minimum of two energy upgrades is required (windows, doors, insulation, air sealing, etc.).
- Keep all ENERGY STAR® stickers on your new windows and doors until the final audit is complete.
Comfort, Style & Efficiency — Your Home Deserves Better
Is your home plagued by drafty windows, stuck doors, or foggy glass? At Great Northern Home Exteriors, we understand how frustrating inefficient or damaged windows and doors can be.
Our replacement services in St. Catharines and across the Niagara region address everything from broken latches and warped frames to cracked glass and energy loss.
- ✓ Eliminate air leaks & drafts
- ✓ Smooth, easy-to-open operation
- ✓ Modern designs with clean finishes
- ✓ Reliable warranties & long-term value
With Great Northern Home Exteriors, you’re not just replacing windows and doors — you’re investing in comfort, efficiency, and lasting value.
Installation Quality You Can See — And Feel
A great product only performs as well as the installation. Here’s what “done right” looks like across our most common upgrades.
Full-Frame & Retrofit Window Installation
Clean lines, accurate sizing, and careful integration with your existing structure for a finished look that feels original to the home.
Steel Entry & Garden Door Installation
Proper alignment, secure sealing, and refined finishing details that enhance both appearance and long-term performance.
Sliding & Custom Patio Door Installation
Smooth operation, clean transitions, and careful attention to thresholds and sealing for everyday comfort.
Upgrade Your Home With a Durable, Energy-Efficient Entry Door
Choosing the right entry door can dramatically improve your home’s comfort, security, and first impression.
Fiberglass Doors
Low Maintenance Durability
Resists warping, cracking, and rotting over time.
Wood-Look Style
Authentic appearance with superior insulation.
Steel Doors
Enhanced Security
Strong construction for added peace of mind.
Energy-Efficient Core
Helps reduce heat loss and drafts.
Garden Doors vs. French Doors — Which Is Right for Your Home?
Garden doors are hinged doors with large glass panels that swing outward, offering bright views and direct patio access.
French doors feature two hinged panels meeting in the middle, delivering symmetry and classic design appeal.
- Practical outdoor access
- Classic architectural style
- Bright, open sightlines
Add Performance and Functionality with Sliding Patio Doors
Modern & Minimalist Design
Wide glass panels bring in natural light and make rooms feel larger and more open.
Customizable to Your Home
Choose frame colours, glass options, and configurations that match your layout.
Energy-Efficient Performance
Low-E glass, tight sealing, and careful installation help improve comfort.
Protect Your Home from the Elements with Storm and Screen Doors
Storm Doors
Extra protection from wind, rain, and snow with durable frames and reinforced glass options.
Screen Doors
Enjoy fresh airflow while keeping insects out — perfect for warmer months.
Styles That Match Your Home
Multiple finishes and configurations designed to complement your home’s exterior.
Enhance Your Home with Durable, Energy-Efficient Vinyl Siding
Premium Look, Strong Protection
Upgrade curb appeal with premium vinyl siding designed to protect against weather and keep your exterior looking sharp year after year.
Styles, Textures & Colours
Choose from a wide selection of profiles, textures, and colour options that match modern, traditional, and classic home designs.
Installed Safely, Backed Properly
Installed by experienced, WSIB-insured professionals, and supported by workmanship and product warranties for long-term confidence.
Protect Your Home with Durable Soffit, Fascia & Eavestrough Systems
Clean Drainage, Better Water Control
Premium aluminum eavestrough systems help move water safely away from your home, reducing the chance of leaks, overflow, and moisture issues near the foundation.
Finished Edges & Low-Maintenance Performance
Soffit and fascia create a clean, finished exterior with durable aluminum that stays sharp and requires minimal upkeep through changing seasons.
5" or 6" Eavestrough Options
Choose 5-inch or 6-inch eavestroughs based on your home’s layout and water-volume needs — available in a wide range of colours and finishes.
Installed with Precision, Backed Properly
Every project is completed with careful detail and supported by a trusted workmanship warranty for confidence you can count on.
What Our Customers Say
We’ve helped hundreds of Niagara homeowners improve comfort, efficiency, and curb appeal with professional installations.
St. Catharines Window Replacement FAQ
How much does it cost to replace windows in St. Catharines?
Pricing depends on window style, size, glass upgrades, and whether you choose retrofit or full-frame installation. The fastest way to get an accurate number is a free in-home estimate where we measure and confirm the best install option for your home.
Do I need a building permit to replace my windows in St. Catharines?
Most standard replacements do not require a building permit. If you’re changing the opening size or altering structure, you may need one. You can review the guidelines on the City of St. Catharines Building Permits page and we’ll walk you through it during your estimate.
What’s the difference between retrofit and full-frame installation?
Retrofit installs a new window into the existing frame — often a great fit when the frame is solid and you want a faster, less disruptive upgrade. Full-frame removes the old frame entirely to rebuild the opening for maximum insulation, sealing, and a cleaner finished look.
How long does a window installation take?
Many projects can be completed in one day, depending on the number of windows and the install type. Full-frame work can take longer because it involves more finishing detail, but we keep the process organized and clean so your home stays comfortable throughout.
How do I compare window energy ratings the right way?
Don’t shop by “sales talk” — compare the actual performance metrics and certification info. Natural Resources Canada explains how windows/doors are rated and certified in Canada here: NRCan: Ratings & Certification . We’ll help you choose glass and frame options that improve comfort and reduce drafts in real-world conditions.
Do you offer warranties on products and installation?
Yes — you get a 5-year workmanship warranty on installation plus manufacturer warranty coverage on the windows themselves. Full details are on our Warranty page.
Replacement Windows Installed Across Niagara
Great Northern Home Exteriors provides professional window replacement services throughout Niagara. Select your city below to explore local installations, window styles, and service details specific to your area.
Tip: If you’re comparing cities on mobile, this grid stays fast and thumb-friendly (no endless scrolling needed).
Explore Our Core Home Exterior Services
Looking for details on a specific upgrade? Use the links below to explore our most requested services — including materials, styles, and installation considerations for homes in St. Catharines.