Commercial Skylight Installation in Toronto & the GTA
Daylight commercial interiors with structurally engineered skylight installations on TPO, EPDM, and modified-bitumen flat roofs.
Commercial buildings benefit from skylights in ways residential homes don't — large open floor plates with deep interior zones can be 30+ feet from any exterior window, and electric lighting costs scale linearly with that interior square footage. A well-designed commercial skylight strategy can reduce daytime lighting load by 30–60% while improving employee, customer, and retail-display lighting quality. Buildoreno installs and replaces commercial skylights on retail, restaurant, office, light-industrial, and mixed-use buildings across the GTA. We work with all major commercial skylight systems — Wasco, Bristolite, Major Industries, VELUX commercial line — and integrate each unit with the existing or new flat roof membrane (TPO, EPDM, or modified bitumen). All commercial installs include engineered curb design (snow + wind load to local building code), manufacturer-spec flashing systems, and full membrane warranty alignment so the skylight install doesn't void the surrounding roof warranty.
What you get, done right
What commercial skylight installation costs across the GTA
Median project pricing in each of our busiest markets. Your exact number depends on scope, access, and site conditions — every Buildoreno quote is free, written, and itemized.
| City | Price range | Full guide |
|---|---|---|
| Toronto | $9,000–$14,000 | View → |
| Mississauga | $5,500–$8,500 | View → |
| Brampton | $4,800–$7,200 | View → |
| Vaughan | $4,500–$7,000 | View → |
| Oakville | $6,000–$9,500 | View → |
| Markham | $14,000–$21,000 | View → |
Median project pricing. See each city guide for the full small / medium / large breakdown.
Our process, step by step
- 1Building Assessment & Daylighting Plan
Site walk to identify dark zones, ceiling type (open joist vs. dropped grid), structural capacity, and best skylight sizes and quantities for the lighting goals.
- 2Engineering & Permit
Engineered curb design with structural calcs. Building permit submitted to the municipality including any opening larger than the existing roof openings.
- 3Roof Opening & Curb
Roof deck cut to spec, engineered curb built to manufacturer height. Often coordinated with HVAC and other roof penetrations.
- 4Flashing System Integration
Manufacturer-spec flashing tied into the existing or new flat roof membrane. For warranty-sensitive installs, the same membrane crew handles both the skylight area and any surrounding work.
- 5Skylight Install & Commissioning
Unit set, sealed, and tested. Operable / motorized units wired and commissioned. Smoke ventilation units integrated with the building's fire alarm system where required.
- 6Interior Finishing & Warranty Handoff
Interior light well finished if exposed, drywall and paint as needed, warranty package delivered including manufacturer, installer, and any commissioning documentation.
What it costs
Every Buildoreno estimate is a free, itemized written quote — no hidden line items. Your exact price depends on site conditions, materials, and scope.
See the full flat roofing cost guide →Last updated: May 2026
Commercial Skylight Installation questions, answered
Yes — we integrate commercial skylight curbs with all common single-ply membrane systems. The flashing system is manufacturer-specific, and for warranty alignment we typically use the same membrane manufacturer for the skylight tie-in as the surrounding roof.
Skylight replacements typically don't require a permit. New openings (cutting a hole in the existing roof structure) require a building permit, structural engineering, and final inspection in every GTA municipality. Buildoreno handles the entire permit package as part of the project.
Yes. We frequently schedule commercial skylight installs around business operating hours — restaurants and retail can't have an open roof during business hours. Quote includes the after-hours premium.
We install both standard daylight skylights and smoke ventilation units (SVUs) for industrial and warehouse applications. SVUs integrate with the building's fire alarm system and provide automatic ventilation during a fire event — typically required by code for certain industrial occupancies.
Stop the leak
before it spreads.
Book a free flat-roof inspection. We'll find the real source — ponding, failed seams, flashing — and quote the honest fix, whether that's a repair or a full membrane.
Call (647) 254-0877