Replacement Windows
St. Catharines
Energy-Efficient Window Replacement, Done Right
Windows, Doors, and Siding, professionally installed by Great Northern Home Exteriors — trusted in Niagara since 2009.
Trusted & Top-Rated Across Niagara
Replacement Windows
St. Catharines
Energy-Efficient
Window Replacement
Done Right
Windows, Doors, and Siding, professionally installed by Great Northern Home Exteriors — trusted in Niagara since 2009.
Trusted & Top-Rated Across Niagara
Get Your Free St. Catharines Window Quote
Ready to upgrade your home with beautiful, energy-efficient windows? Tell us about your project and our St. Catharines team will provide a detailed, on-site quote — no pressure, no hidden fees.
- ✓Proudly serving St. Catharines homeowners since 2009
- ✓Expert retrofit and full-frame window installation
- ✓Upfront pricing and professional, no-pressure quotes
Why Choose Great Northern Home Exteriors?
👷 Experienced Installers, Proven Results
Our in-house crews live and work here in Niagara — trained, experienced, and detail-oriented. Every install is done the right way, not just the fast way.
🏠 Quality Over Shortcuts
We don’t cut corners:
- Full-frame window installations when others settle for inserts.
- Custom aluminum capping for a seamless, finished look.
- Thorough site clean-up that shows respect for your home.
🌟 Consistency & Accountability
No lowest-bidder outsourcing. Every project is handled by our trusted in-house team, ensuring consistent workmanship and long-term results you can rely on.
🛡 Reputation Built on Trust
Since 2009, we’ve been serving St. Catharines and the Niagara Region with:
- A+ BBB accreditation
- High-performance, Canadian-made products
- Exceptional customer service
💬 Real People, Honest Service
When you call us, you won’t be directed to a call center. You’ll speak with a local team who knows your neighbourhood and understands the challenges of Niagara’s climate.
✅ No Gimmicks. No Inflated Promises.
Just great products, honest service, and top-tier installations from people who truly care about your home.
Ontario Window & Door Rebate Program
Note: Replacing existing ENERGY STAR-certified products does not qualify.
Eligibility Requirements
Home Energy Assessment
Qualification
To be eligible, homeowners must complete at least two energy upgrades — such as insulation, new windows or doors, air sealing, or a hot water heat pump.
Important Note
Comfort, Style & Efficiency — Your Home Deserves Better Windows & Doors
Is your home plagued by drafty windows, stuck doors, or foggy glass? At Great Northern Home Exteriors, we know how frustrating inefficient or damaged windows and doors can be.
That’s why our specialized replacement services in St. Catharines and across the Niagara region tackle it all — from broken latches and warped frames to cracked glass and energy inefficiencies.
Our expert team ensures a seamless process, delivering upgrades that boost insulation, reduce energy bills, and create a more comfortable living space.
Experience the difference with our comprehensive replacements:
- ✓Say goodbye to air leaks and difficult-to-open windows.
- ✓Restore beauty with modern styles and flawless finishes.
- ✓Enjoy lasting durability backed by our trusted warranties.
With Great Northern Home Exteriors, you’re not just replacing windows and doors — you’re gaining peace of mind, increased property value, and a home transformation that lasts.
Beautiful, Durable Windows & Doors — Installed with Care
From your first consultation to the final installation, we handle every step with care and precision. Our goal is simple — to leave every customer 100% satisfied with windows and doors that look beautiful and perform flawlessly.
We use only top-quality materials and follow strict installation standards, ensuring your investment delivers lasting comfort, efficiency, and curb appeal for years to come.
Our Process
Assessment and Consultation
- Introduction and Understanding:
Begin by introducing Great Northern Home Exteriors. We’ll review any specific needs or concerns you’d like to address with your windows and doors to ensure the perfect solution for your home. - Window and Door Selection:
Our team will guide you through window and door options — discussing styles, materials, and energy efficiency. You’ll explore a range of Canadian-made products that combine beauty, durability, and performance. - Budget Discussion:
We’ll discuss your budget and align your preferences with the best options available. Expect transparent pricing and honest details about all potential cost factors — no surprises, ever.
Measurement and Evaluation
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On-Site Visit:
Once you’ve selected your preferred windows and doors, we’ll schedule an on-site visit to begin your official quotation. This ensures accurate pricing and clear communication from the very start. -
Professional Measurement:
After confirming your order, our trained installation professionals visit your home to take precise measurements. Every window and door is checked for the correct size, fit, and installation requirements. -
Assess Installation Requirements:
We’ll evaluate your existing structure to identify any potential challenges or additional needs. This proactive approach ensures a seamless installation and long-lasting performance.
Free Quoting and Proposal
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Prompt Quote Preparation:
Using the measurements and assessment data gathered during your visit, our team quickly prepares a detailed quote. We aim to deliver it the same day or within a short turnaround time. -
Clear and Transparent Pricing:
Every quote is presented with complete transparency, breaking down costs clearly so there are no hidden fees or surprises — just honest, upfront pricing. -
Review and Confirmation:
We’ll review the quote together, addressing any questions or concerns you may have. Once confirmed, we’ll guide you through next steps and installation timelines to keep your project on schedule.
Full Frame and Retrofit Window Installation
Steel Entry and Garden Door Installation
Standard and Custom Patio Door Installation
Professional Vinyl Window Installation in St. Catharines
Vinyl windows are a superior choice for any home renovation project.
They outperform aluminum windows in durability and energy efficiency, as they will not warp, crack, or peel over time.
The advanced thermal units in modern vinyl windows can help you reduce heating and cooling costs throughout every season in St. Catharines.
Our team of professional installers handles every aspect of your vinyl window installation — from full-frame replacements to retrofit solutions designed to match your home’s style and structure.
We also take care of finishing details such as bay and bow window installations,
interior trim and casings, custom aluminum capping, and vinyl brickmoulds for a seamless look.
With Great Northern Home Exteriors, your window upgrade will be
smooth, efficient, and built to last — ensuring that when homeowners search
“replacement windows St. Catharines,” your home stands out for its beauty and performance.
Maximize Home Efficiency with Energy Star® Certified Windows
When planning a window replacement project, it’s essential to choose energy-efficient options that not only boost your home’s curb appeal but also deliver long-term savings and added value.
Energy Star®-certified windows are widely recognized as the smartest choice for replacing old, drafty windows. They help reduce energy costs, improve comfort, and increase resale value.
Popular Window Styles & Their Benefits
- Casement Windows – Hinged at the side, they swing outward for maximum ventilation and a modern look.
- Double Hung Windows – Two sashes slide up and down for versatility and airflow control.
- Single Hung Windows – A fixed top sash with a lower sash that moves — a cost-effective classic.
- Tilt Slider Windows – Sash tilts inward for easy cleaning.
- Single Slider Windows – A simple, functional design with one sash that slides horizontally.
- Awning Windows – Hinged at the top, they open outward to allow fresh air even during rain.
- Bay & Bow Windows – Multi-pane designs that project outward, adding space, light, and architectural charm.
- Fixed Windows – Non-operable, but let in a flood of natural light.
- Picture Windows – Large stationary windows perfect for framing stunning views.
✨ By combining style, performance, and efficiency, the right replacement windows can dramatically transform your home — inside and out.
Upgrade Your Home With a Durable, Energy-Efficient Entry Door
Choosing the right entry door can completely transform your home’s look, comfort, and security. At Great Northern Home Exteriors, we offer both fiberglass and steel doors that balance beauty, durability, and efficiency — giving your home a fresh first impression that lasts for years.
Fiberglass Doors
- ✓Durable and low-maintenance — resists warping, cracking, and rotting over time.
- ✓Mimics the look of real wood while providing superior insulation.
- ✓Ideal for homeowners seeking a stylish, long-lasting option with minimal upkeep.
Steel Doors
- ✓Known for their strength and security, perfect for peace of mind.
- ✓Offer excellent energy efficiency with insulated cores to reduce heat loss.
- ✓A cost-effective choice for homeowners who value performance and protection.
Wrap-Up
No matter which material you choose — fiberglass or steel — a well-crafted entry door adds value, curb appeal, and comfort to your home. Trust the experts at Great Northern Home Exteriors for precision installation and lasting results across the Niagara region.
Garden Doors vs. French Doors: Find the Perfect Style for Your Home
Garden doors (often called patio doors) are hinged doors with large glass panels that swing open to the outside.
They’re perfect for easy access to your backyard, deck, or patio — while providing an unobstructed view of the outdoors.
✨ Best for: Homes with outdoor living spaces that need bright natural light and wide access.
French doors, by contrast, typically feature two hinged panels that meet in the middle. Known for their classic and elegant design, they’re often chosen as entry doors or used to separate interior rooms with a sense of sophistication.
✨ Best for: Homeowners seeking a timeless, decorative statement — complete with ornate hardware, trim, and glass detailing.
🔑 Key Differences
- Function:
Garden doors → outdoor access (patio, backyard)
French doors → entryways or elegant room dividers. - Design:
Garden doors → streamlined and practical
French doors → ornate, decorative, and sophisticated. - Impact: Both add style, natural light, and resale value to your home.
👉 Whether you choose the bright practicality of garden doors or the timeless charm of French doors, either option enhances your home’s curb appeal, comfort, and long-term value.
Add Performance and Functionality with Sliding Patio Doors
Modern & Minimalist Design
Sliding patio doors create a sleek, contemporary look while making any room feel larger and more open.
Wide glass panels fill your home with natural light and give the illusion of extra space —perfect for bright, airy living areas.
Customizable to Your Home
From frame colors to glass configurations, sliding patio doors can be tailored to match your home’s style and layout. Whether you prefer a modern aesthetic or a more traditional finish, these doors are built to complement your space.
Energy-Efficient Performance
Today’s sliding doors feature double-paned glass, Low-E coatings, and insulated frames.
These upgrades help reduce heat loss, improve comfort year-round, and lower your energy bills — without sacrificing style.
Protect Your Home from the Elements with Storm and Screen Doors
Storm and screen doors are a practical and stylish addition to any home.
Storm doors add an extra layer of protection against wind, rain, and snow, helping maintain comfort and security in all seasons. Made from durable materials like aluminum, they often include reinforced glass or insulated panels for improved energy efficiency and weather resistance.
Screen doors, on the other hand, provide ventilation and airflow while keeping out insects and debris. Constructed from lightweight mesh materials, they allow you to enjoy the fresh outdoor breeze without compromising comfort or cleanliness.
Both storm and screen doors come in a wide range of styles, finishes, and configurations to complement any home’s architecture. Whether you prioritize strength and insulation or fresh air and natural light, Great Northern Home Exteriors has the right solution for your home.
Enhance Your Home with Durable, Energy-Efficient Vinyl Siding
At Great Northern Home Exteriors, we specialize in providing premium vinyl siding that enhances your home’s beauty, protection, and energy efficiency.
Our siding options come in a wide range of styles, textures, and colors to match any design vision —all installed by our experienced, WSIB-insured professionals.
Whether you’re upgrading for curb appeal or long-term durability, our vinyl siding delivers reliable performance and lasting value — fully backed by our workmanship and product warranties.
Protect Your Home with Durable Soffit, Fascia & Eavestrough Systems
At Great Northern Home Exteriors, we install premium aluminum soffit, fascia, and eavestrough systems that protect your home from rain, snow, and water damage. Our expert team ensures proper drainage and seamless water flow away from your roofline and foundation — preventing costly leaks and structural wear.
Available in a wide range of colors and finishes, our systems not only enhance curb appeal but also offer long-lasting performance.
Choose from both 5-inch and 6-inch eavestroughs to match your home’s design
and capacity needs. Every installation is handled with precision and backed by our
trusted workmanship warranty, giving you peace of mind through every season.
What Our Customers Say
We’ve helped hundreds of Niagara homeowners upgrade their windows and doors with expert installations that boost comfort, efficiency, and curb appeal.
- ✔ Energy-efficient upgrades that lower heating and cooling bills
- ✔ Beautiful, durable products that enhance curb appeal
- ✔ Reliable service backed by local experience since 2009
No matter the project, we’re committed to providing exceptional craftsmanship and lasting results you can feel proud of.
“From quote to installation, everyone was informative, experienced, and friendly. We love our new windows — highly recommend!”
“I’ve used Great Northern for years. Excellent workmanship and materials,
competitive pricing. Consistently reliable.”
“We had massive water and draft issues at our side door. GNHE’s install was meticulous — now zero drafts, no water logging, and that entrance is warm.
Dramatic difference.”
“We had 6 vinyl windows installed on our very old brick house. The workmanship is excellent, it was done on time, and the cleanup was perfect. The new windows look great and the price beat other quotes.
We’ll be getting more done — and maybe a door — soon. Thanks!”
“GNHE was very professional.I had nine windows replaced.The techs showed up on time and completed the work within the required timeframe. No issues at all. I’d recommend them for any of their services.”
“This is the second time I’ve used Great Northern for a large project. First they replaced all my windows; most recently they replaced all fascia, soffits, and eaves troughs. Clodette and her crew are efficient, great to work with, and deliver quality at a fantastic price. I’ll definitely use them again for my next big project!”
St. Catharines Window Replacement FAQ
How much does it cost to replace windows in St. Catharines?
The cost varies based on the window style, size, glass options, and whether you choose retrofit or full-frame installation. Our team provides free in-home estimates to give you an accurate quote for your project.
Do I need a building permit to replace my windows in St. Catharines?
Most standard window replacements in St. Catharines do not require a building permit. However, if you’re enlarging an opening or altering your home’s structure, a permit may be needed. You can review the local guidelines directly on the City of St. Catharines Building Permits page , or our team will be happy to advise you during your consultation.
What’s the difference between retrofit and full-frame installation?
Retrofit windows are installed into your existing frames —ideal for keeping interior trim intact and minimizing cost. Full-frame installation removes the old frame entirely for maximum efficiency, insulation, and a clean, modern look.
How long does a window installation take?
Most St. Catharines window replacements can be completed in one day. Larger or custom projects may take longer, but our in-house crews work efficiently to minimize disruption to your home.
Do you offer warranties on products and installation?
Yes — we provide a 5-year workmanship warranty on all installations, plus full manufacturer warranties on every window we install. Learn more on our Warranty page.
Serving Homeowners Across Niagara
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St. Catharines Windows (You’re Here)
Looking for more than windows? We also provide Doors, Siding, and Eavestrough for homeowners in St. Catharines.