Modern replacement windows are one of the most impactful upgrades for energy savings, year-round comfort, and a tighter, better-protected home envelope. At Fortena, we handle the hard choices by assessing your home, priorities, and budget, then recommending the best fit rather than pushing whatever is on hand.
If you are planning a window replacement or door installation in Quebec, you may be eligible for meaningful rebates through active energy efficiency programs. For homeowners, Rénoclimat can provide up to $150 per eligible door or window. Depending on your building type, additional support may also be available through utility and commercial-focused initiatives that incentivize building envelope upgrades, including eligible window replacements for multi unit and commercial properties. In our full guide, we summarize what is currently open at the provincial, federal, and utility levels, the key conditions to qualify, and the practical steps to apply so you can reduce the total cost of your upgrade without compromising on performance.
For patio doors, we review the opening, floor level, and traffic pattern, then measure for the right configuration and track system.
Door configuration and ordering
You choose between sliding or French‑style units, glass and grid options, and hardware, while we handle ordering, access planning, and timing with your deck or patio.
Precise installation and adjustment
We prepare the sill, set the frame plumb and square, insulate and seal around it, then adjust rollers, locks, and weatherstripping so the door glides easily and seals tightly.
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francine davis
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Très bon travail effectué par les installateurs; très professionnel; je recommande sans réserve.
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Michel Sylvestre
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Installation très réussie de deux grandes fenêtres à battant. Travail minutieux et très soigné. Installateurs serviables.
Recommandé sans hésitation!
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Dan Bigeault
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Excellent service d'installation et produits comme portes et fenêtres. Mes prochaines portes et fenêtres seront sûrement avec cette entreprise
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Adriana Enache
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Impeccable work and very good product. I recommend this company.
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Alex Titan
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Je suis très satisfait du travail réalisé ! Les fenêtres sont d’excellente qualité et l’installation a été faite de manière impeccable. Les travailleurs ont été très professionnels et ont travaillé avec beaucoup de soin. À la fin des travaux, tout était propre et bien rangé. Franchement, un service au top, je recommande fortement !
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vincent smith
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I had 4 windows installed (3 br 1 kitchen) 1 living room and a bathroom slider as well as a very large patio door(slider) in June 2024 and I was very pleased with the products and most definitely with the installation and service from Alex and his assistant. All work was performed in one day but Alex had to return a few days later as 1 of the bedroom windows extensions was not the right size so he removed it and returned with a new extension and installed it. His work and cleanliness are outstanding and he is an exceptional person.
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Amel Mokrani
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Un service professionnel. Travail bien fait et très propre.
Merci Alexandro
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Stephanie Butera
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Très rapides et efficaces! Ils ont changés toutes les fenêtres de notre maison, et la porte patio.
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Michel Laforest
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Fiable, professionnel, impeccable et rapide 👏👏👏.
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High-performance windows & doors built for Quebec’s harsh winters and hot, humid summers.
Empowering Homes With Energy-Efficient Windows & Doors
100%
Triple pane Low E glass with argon fill reduces heat loss, drafts, and condensation for consistent comfort
Energy-efficient frames, warm edge spacers, and high-performance seals cut air leakage, keep indoor temperatures stable
Patio doors and entry doors with enhanced cores, tight weatherstripping, and multipoint locks improve efficiency, comfort, and noise control
We provide a comprehensive suite of tailored services designed to enhance comfort, energy efficiency, and style in your home. From sliding glass to French or multi-panel patio doors, our team ensures each installation is precise, smooth-operating, and complements your living space.
Using advanced installation techniques and high-performance materials, we deliver patio door solutions that reduce drafts, improve thermal performance, and provide reliable security, while maximizing natural light and outdoor access for years to come.
Local Roots in Saint-Constant, Serving Greater Montreal
Based in Saint-Constant, Fortena serves homeowners and property managers across Greater Montreal’s South Shore and all Montreal neighbourhoods, including Saint-Constant, La Prairie, Candiac, Brossard, Longueuil, Boucherville, Saint-Lambert, Saint-Bruno-de-Montarville, and Chambly. We tailor every window replacement and door installation to the realities of each area. In family-focused communities like Saint-Constant, Saint-Bruno-de-Montarville, Boucherville, Candiac, and La Prairie, our work often involves full retrofits for bungalows, split-levels, and newer two-storey homes, with energy-efficient PVC windows & doors systems and tight, clean finishing. In denser markets like Brossard and Longueuil, we frequently coordinate installs for townhouses, condos, and multi-plexes, with precise measurement, access planning, and consistent results across units.
