Commercial Flat Roofing in the GTA

We focus on small and light-commercial flat roofs — condo and townhouse blocks, plazas and strip malls, mixed-use and multi-unit buildings, restaurants, offices, and small industrial units. Flat-membrane roofing is the one trade where our residential exterior-renovation expertise extends cleanly to commercial work. We're honest about the edges: very large-format industrial or warehouse roofs and steep-slope commercial assemblies aren't our specialty, and we'll refer you to a dedicated commercial roofer rather than overreach. If you're not sure where your building falls, call us — a quick look tells us fast.

Both are excellent, proven single-ply membranes; the choice comes down to priorities. TPO is the most popular today: its white, reflective surface lowers summer cooling load, and its heat-welded seams create a strong, monolithic membrane. EPDM (black rubber) is proven, budget-friendly, and forgiving on roofs with lots of penetrations or odd shapes, though the dark surface absorbs heat. For most GTA commercial buildings we lean TPO for the energy savings and seam strength, but we'll recommend based on your roof, your budget, and how the space is used. Modified bitumen is a third option where the roof sees foot traffic or equipment.

Installed, expect roughly $8–$14 per square foot for TPO, $7–$12 for EPDM, and $7–$13 for modified bitumen, with the spread driven by insulation, deck condition, drainage corrections, and access. A roof recover or restoration coating — only when the deck is still sound — runs about $4–$8 per square foot and avoids a full tear-off. As a rough scenario, a typical 5,000 sq ft commercial roof lands somewhere around $40,000–$90,000. Repairs are usually $500–$5,000. These are planning ranges — every Buildoreno proposal is a free, itemized written estimate after we've assessed the roof.

Often, yes — and we'll tell you when that's the smarter spend. If the damage is isolated (a few failed seams, flashing, or a localized leak) on an otherwise sound roof, a repair solves it. If the membrane is aging and leaking in spots but the insulation and deck underneath are still dry, a roof recover or restoration coating can add 10+ years for a fraction of a tear-off. Full replacement is for widespread failure, wet insulation, or ponding from poor slope — where we also correct the drainage while the roof is open. We take a core sample when needed so the recommendation is based on what's actually under the membrane, not a guess.

We plan around that from the start. Commercial flat-roof work happens above the occupied space, so we sequence staging, access, and the noisier steps around your operating hours where we can, keep entrances and parking clear, and communicate the schedule up front. For multi-tenant and condo buildings we coordinate with property managers and boards so everyone knows what's happening and when. The goal is a watertight new roof with the least possible interruption to the people underneath it.

Yes. Every commercial flat-roof project carries our written workmanship warranty on top of the manufacturer's membrane warranty (typically 20–30 years on the material for TPO and EPDM). We also offer a straightforward maintenance program — periodic inspections, seam and flashing checks, and minor upkeep — because flat roofs last dramatically longer when small problems are caught before they become leaks. It's the same milestone-based, $0-down approach and the same standards we bring to our residential roofing work.