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.
We start with a free visit to review your openings, check for drafts or moisture risks, and take precise measurements. You also get clear guidance on styles, glazing, and performance options based on your home and budget.
Customized Windows Ordering and Project Planning
Next, we confirm the final specifications and order your windows to match your exact measurements and selections. We then plan the job details, including access, protection of interior finishes, and scheduling.
Professional Installation and Clean Finishing
We remove the old unit, prepare the opening, and set the new window square, level, and securely fastened. We air seal and insulate around the frame, complete interior and exterior finishing, then do a full cleanup and inspection.
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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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Pierre Guay
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Équipe professionnelle. Travail impécable, rapide et discret. Excelente finition. Reste qu'un coup de pinceau a donnet. Espace de travail protégé, propreté assuré. Pdg et retraité du millieu de la rénovation résidentielle, je recommande grandement Fortena et son équipe d'experts.
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steph desma
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Excellent service.
Personnel courtois et professionnel.
Travail propre et bien fait.
Je recommande cette entreprise haut la main!
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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 specialize in professional window installation designed for Quebec’s extreme climate conditions. From triple-pane Low-E glass with argon gas to reinforced PVC frames and warm-edge spacers, every system we install is engineered to minimize heat loss and reduce air infiltration.
Proper installation is just as critical as product quality. Our team ensures accurate measurements, insulated framing, airtight sealing, and correct exterior flashing to protect your home from drafts, condensation, and water intrusion.
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.
