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Fortena Windows & Doors is a team of experts in the supply and installation of replacement windows & doors for entry and patio in Greater Montreal, South Shore and Laval.
We offer modern, secure, energy-efficient PVC fenestration and entry systems for any budget. Based in Saint-Constant, Quebec, Fortena uses only its own trusted local installers and guarantees impeccable window replacement and door installation.
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Financing

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Energy Star Windows Montreal
Régie du bâtiment du Québec
APCHQ

Offering the Efficiency and Innovation of Modern Windows & Doors While Providing Competitive Prices and Warranties in Montreal

Innovative entry doors: style meets high performance, security and insulation.
Patio doors in multiple styles and sizes, expertly measured and installed
Energy-efficient PVC windows build for Canada!
Egress basement windows for emergency exit.

Our Expertise in Numbers

With over a decade of experience in windows & doors installation, Fortena Windows & Doors is proudly one of the most locally recommended window installers, trusted for clean workmanship, clear communication, and consistent results.
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Windows & Doors
Reno Climat Quebec Windows Grant

Save up to $150 per each new window or door!

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.

Casement Window is crank operated, opening outward for maximum breeze control.
Awning window installation
Awning Window is top-hinged, cranks outward, and ventilates even during rain.
Sliding Window glides on tracks, ideal for wide openings and easy use.
Tilt & Turn Window tilts for ventilation, then swings open for cleaning.
Hung Window is vertically sliding, offering classic style and easy ventilation.
Guillotine Window is double-hung, with two moving sashes for flexible airflow.
Bay and Bow Window projects outward, adding panoramic views and extra space.
Egress Window installation
Egress Window is larger for emergency exit, bringing light to basements.
High-performance windows & doors built for Quebec’s harsh winters and hot, humid summers.

Empowering Homes With Energy-Efficient Windows & Doors

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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
Fortena Windows & Doors specializes in high-performance window and door replacement designed for Quebec’s demanding climate. From triple-pane Low-E glass with argon fill to insulated steel and fiberglass entry doors, every product we install is selected for durability, airtightness, and long-term energy efficiency.
Our experienced installers ensure precise measurements, proper flashing, and professional sealing to prevent air leakage, water infiltration, and premature frame failure. The result is a tighter building envelope, improved indoor comfort, and lower heating and cooling costs year-round.

Local Roots in Saint-Constant, Serving Greater Montreal

Based in Saint-Constant, Fortena Windows & Doors 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.