Toronto-based team delivering commercial curtain wall, glazing, window replacement and caulking across all of Ontario. Fully insured, height-certified, and trusted by property managers and general contractors.
We handle every detail of a building's exterior glazing and sealing system. From curtain walls on high-rise towers to precision caulking on plazas and campuses — across Toronto, the GTA, and all of Ontario.
Full installation of commercial curtain wall systems for high-rise towers, mid-rises, and modern facades. Precision fit, weather-tight results, certified work at height.
Glass installation for storefronts, curtain wall systems, and architectural glazing. Single panes to large structural units — properly set, fully sealed, built to last Toronto winters.
Old or leaky units out, modern energy-efficient systems in. Commercial windows and doors replaced with minimal disruption. Sealed tight, properly insulated, professionally finished.
Professional caulking of expansion joints, window perimeters, wall-to-frame seams, and façade transitions. Industrial-grade sealants applied with proper backer rod and tooling.
We can also supply windows, doors, and curtain wall materials for your project — sourced through our network at competitive pricing.
A look at recent work — from high-rise curtain wall to caulking restoration on educational campuses. Tap any project to see the full gallery.
GSNM Construction is a Toronto-based team focused entirely on the commercial building envelope — curtain wall, glazing, window and door replacement, and caulking. At our core is a permanent crew of five skilled tradespeople who work every project hands-on. When a job calls for more, we scale up through a trusted network of vetted installers to match the size and pace of the work. That structure keeps us precise and accountable on smaller jobs, while giving us the depth to take on full high-rise facades.
Five core tradespeople handle the work directly — no faceless rotating labour, no guesswork about who shows up on site.
Additional vetted installers are brought in when a project needs them, so capacity matches the job — from a single storefront to a tower.
We do envelope work and nothing else. That focus means sharper detailing, fewer surprises, and results that hold up to Ontario weather.
A skilled team delivering results that bigger crews can't match — backed by experience, safety standards, and a deep partner network when scale demands it.
Fully insured for $10 million. Property managers and general contractors work with us with complete confidence — every project protected from day one.
Trained and equipped for 30 ft and beyond. Full Working at Heights certification, certified fall protection, and zero compromise on safety protocols.
Message us on WhatsApp and get a quote within hours, not days. We respect your timeline and respond like the schedule matters — because it does.
Backed by a trusted partner network with over 20 years in the industry and 200+ completed projects. When the job is big, we have the depth to deliver.
From first message to final seal — a clear path with a real person on the other end at every step.
Message us on WhatsApp or email with your project. Photos or drawings help us respond faster and more accurately.
We assess the scope — on-site when needed — and send a clear, itemized quote. No vague numbers, no pressure.
We agree on timing, materials, and site access, and coordinate the work around your building's day-to-day operations.
Our crew installs to spec, keeps the site clean, and leaves every joint properly sealed, insulated, and finished.
Honest pricing means honest trade-offs. Tell us your two priorities — we'll deliver.
Our reviews live on Google — public, verified, and unfiltered. We're a newer team earning every recommendation through the quality of the work itself. Read what clients have to say, and if we've worked together, we'd genuinely appreciate you sharing your experience.
Send us a message — we respond fast. We work with property managers, general contractors, and direct clients across Toronto, the GTA, and all of Ontario.