Energy Star certified replacement windows and doors that reduce energy costs, enhance comfort, and increase home value. Expert installation with lifetime warranty.
Choose from our wide selection of styles to match your home's architecture and your lifestyle.
Classic style with both sashes opening
Crank-operated for maximum ventilation
Easy operation with horizontal sliding
Elegant projection adding space and light
Beautiful access to outdoor living spaces
Stunning first impressions with security
We partner with industry-leading manufacturers to bring you the highest quality windows and doors.
Every window we install features cutting-edge technology for maximum performance and longevity.
From consultation to completion, we make your window and door project smooth and stress-free.
We visit your home, measure all windows/doors, show product samples, discuss style and energy options, and provide a detailed written estimate—all completely free.
Choose from our premium window and door options, select colors and hardware, review energy ratings, and schedule installation at your convenience.
Our certified installers remove old windows/doors, inspect and prep openings, install new products with proper insulation and sealing, and finish with quality trim work.
We inspect all seals and operation, show you how to operate and maintain your new windows/doors, complete thorough cleanup, and ensure 100% satisfaction.
Experience the difference with our expert installation and premium products.
Expert installation with thousands of satisfied customers
Fully licensed, bonded, and WSIB covered
Lifetime workmanship warranty on all installations
Flexible payment options available (OAC)
Premium energy-efficient products that save money
Extensive styles, colors, and hardware options
Proudly providing expert window and door installation throughout the Greater Toronto and Hamilton areas.
Don't see your area? Contact us to confirm service availability.
Don't just take our word for it. See what homeowners say about our window and door installation services.
"We replaced all 14 windows and our front door with Custom Contracting. The difference in energy bills is incredible! No more drafts and our home looks beautiful. Highly professional team."
Sarah M.
Burlington, ON
"Outstanding service from consultation to completion. They helped us choose the perfect windows for our Victorian home and the installation was flawless. Love the new patio doors too!"
Tom R.
Hamilton, ON
"Best decision we made! New triple-pane windows have made our home so much more comfortable. The crew was clean, professional, and completed everything in two days. Excellent value!"
Emily K.
Oakville, ON
Get answers to common questions about replacement windows, doors, energy efficiency, and costs.
A: Replacement windows in Ontario typically cost $450-$1,200 per window installed, depending on size, style, and features. Double-hung vinyl windows are most economical ($450-$700), while casement, bay, or picture windows with premium features cost $800-$1,200+. For an average home replacing 10-15 windows, expect $6,000-$15,000 total. Factors affecting price include window size, energy efficiency ratings, Low-E coatings, argon gas fill, frame material (vinyl, fiberglass, wood), and installation complexity. We offer free estimates and 0% financing to make your project affordable.
A: The most energy-efficient windows for Ontario feature triple-pane glass with Low-E coatings, argon or krypton gas fill between panes, insulated vinyl or fiberglass frames, warm-edge spacers, and proper weatherstripping. Look for Energy Star certification with U-values of 0.25 or lower and ER (Energy Rating) of 25+. Triple-pane windows perform best in Ontario's climate extremes, reducing heat loss in winter and heat gain in summer. While they cost 10-20% more than double-pane, the energy savings pay back within 5-8 years through lower utility bills.
A: Most window replacement projects take 1-3 days depending on the number of windows. A typical home with 10-12 windows can often be completed in one full day with our experienced crew. Larger homes or complex installations with bay windows, picture windows, or structural modifications may take 2-3 days. We work efficiently to minimize disruption, typically completing 3-5 windows per day per installer. Each window takes 45-90 minutes to remove old, prep opening, install new, insulate, seal, and finish trim.
A: We recommend replacing all windows at once for several reasons: bulk pricing saves 15-25% versus individual replacements, consistent appearance throughout your home, single mobilization/setup reduces overall cost, coordinated energy efficiency improvements, one-time disruption instead of multiple, warranty start dates align for all windows, and potential rebates require whole-home upgrades. If budget is tight, prioritize south and west-facing windows for maximum energy impact, then complete remaining windows when financially feasible.
A: Retrofit (insert) replacement installs new windows into existing frames, preserving exterior trim and siding. It's faster (30-45 min per window), less expensive, maintains exterior appearance, but provides slightly smaller glass area. Full-frame replacement removes entire window including frame to the rough opening, allows inspection/repair of structure, ensures proper insulation and sealing, maximizes glass size, but costs 20-30% more and requires exterior trim work. We recommend full-frame for windows 25+ years old or with any moisture damage, rot, or structural concerns.
A: Yes! Energy-efficient windows can reduce heating and cooling costs by 15-30% depending on your current windows. Old single-pane windows lose significant heat—upgrading to Energy Star triple-pane can save $200-$500 annually on utility bills. Additional benefits include more consistent indoor temperatures, reduced drafts and cold spots, less condensation and moisture issues, UV protection for furniture and flooring, improved home comfort year-round, and increased home value (70-80% ROI). Most Ontario homeowners see payback within 8-12 years, then enjoy ongoing savings.
A: We provide a lifetime workmanship warranty on all window and door installations, covering installation quality, proper sealing and weatherproofing, and trim work. Windows and doors come with manufacturer warranties: vinyl windows typically 20-year to lifetime warranties, fiberglass windows lifetime warranties, hardware and mechanisms 10-20 year warranties, glass sealed units 10-20 year warranties. Our installation warranty is fully transferable if you sell your home, adding value and providing peace of mind to future owners.
A: Generally, no permit is required for direct replacement windows of the same size in Ontario. However, permits ARE required if enlarging or creating new window openings, altering structural framing or load-bearing walls, egress (bedroom) window installations for safety, or if your home is designated heritage. We navigate permit requirements for you when needed, ensuring all work meets Ontario Building Code including proper U-values, emergency egress requirements, and safety glass where required. We handle all paperwork as part of our service.
A: Consider your home's architectural style (Victorian suits double-hung, modern suits casements/picture), functional needs (casements for maximum ventilation, sliders for easy operation), room purpose (large picture windows for living rooms, awnings for bathrooms), maintenance preferences (vinyl for low maintenance, wood for traditional), and budget constraints. We provide expert guidance during your free consultation, showing samples and discussing how different styles perform. Our goal is matching windows to your home's character while maximizing energy efficiency and value.
A: Yes, windows can be installed year-round in Ontario with proper precautions. Modern window installation takes only 45-90 minutes per window, minimizing cold air exposure. We use cold-weather spray foam and sealants rated for low temperatures, pre-measure and prep everything to minimize open time, use plastic sheeting to contain warm air, and schedule installations during milder winter days when possible. Interior temperatures typically drop only 2-3°C during installation. Many homeowners prefer winter installation to enjoy energy savings immediately and take advantage of off-season availability.
Have more questions? We're here to help!
Contact Us TodayFor over 25 years, Custom Contracting has been Ontario's trusted choice for professional window and door replacement services. We specialize in energy-efficient, Energy Star certified windows and doors that dramatically reduce heating and cooling costs while enhancing your home's comfort, security, and curb appeal.
Our extensive selection includes double-hung, casement, sliding, bay, bow, and picture windows, plus beautiful entry doors and patio doors from industry-leading manufacturers like ProVia, Gentek, and Royal Building Products. Every product features triple-pane glass with Low-E coatings, argon gas fill, advanced weatherstripping, and multi-point locking systems for maximum energy efficiency and security.
Our certified installers follow manufacturer specifications precisely, ensuring proper insulation, air sealing, and flashing for optimal performance. We handle everything from accurate measurement to expert installation to quality trim finishing. Every project is backed by our lifetime workmanship warranty plus comprehensive manufacturer warranties of up to lifetime on frames and 20 years on glass units.
Serving Burlington, Hamilton, Oakville, Mississauga, Kitchener-Waterloo, and communities throughout Southwestern Ontario, Custom Contracting is your local window and door expert. Contact us today for a free in-home consultation and discover why thousands of Ontario homeowners trust us—with flexible 0% financing options available to make your project affordable.
45 Worthington Dr Unit H
Brantford, ON N3T 5M1
Free in-home consultations
Same-week appointments
Flexible scheduling
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45 Worthington Dr Unit H
Brantford, ON N3T 5M1
✉️ Email Us
infor@customcontracting.ca