Buildoreno is a residential exterior-renovation specialist — and flat-membrane roofing is the one place that expertise extends cleanly to small and light-commercial buildings: condos, plazas, mixed-use, multi-unit, and small industrial. Same crews, same engineered drainage and heat-welded seams, same milestone billing. We're upfront about scope — very large-format industrial or steep-slope commercial isn't our specialty, and we'll tell you when to look elsewhere.
For small and light-commercial flat roofs in the GTA, the three workhorse membranes are TPO (reflective, heat-welded seams — the most popular today), EPDM (proven rubber, budget-friendly), and modified bitumen (tough underfoot). A commercial flat-roof replacement typically runs about $7–$14 per square foot installed depending on the system, insulation, and deck condition, while a roof recover or restoration coating — when the deck is still sound — can extend life for roughly $4–$8 per square foot without a full tear-off. Repairs usually fall between $500 and $5,000. We assess honestly, often with a core sample, and recommend the least-cost option that actually solves the problem — repair, recover, or replace.
We'd rather tell you up front whether we're the right call than overreach. Here's where our small and light-commercial flat-roofing focus fits — and where we'll honestly point you to a dedicated commercial roofer instead.
Condo and townhouse blocks, plazas and strip malls, mixed-use and multi-unit buildings, restaurants, offices, and small industrial units. Low-slope membrane roofs in the range we re-roof every season — this is squarely what we do.
Larger buildings, multiple roofs across a property, or work that needs to be phased around tenants. Often a fit — let's walk the roof, take a core sample, and scope it honestly before anyone commits.
Very large industrial / warehouse-format roofs, steep-slope commercial, or specialized assemblies aren't our focus — and we'll say so rather than overreach. If that's you, we'll point you toward a dedicated commercial roofer.
The three workhorse membranes — TPO, EPDM, and modified bitumen — plus a recover option when the deck is still sound. Here's how they compare on installed cost, lifespan, and where each fits best.
| System | Installed cost | Lifespan | Best for |
|---|---|---|---|
| TPO (thermoplastic) | $8 – $14 / sq ft | 20 – 30 yrs | Most popular today — reflective (lower cooling load), heat-welded seams |
| EPDM (rubber) | $7 – $12 / sq ft | 20 – 30 yrs | Proven, budget-friendly, forgiving on complex roofs; black absorbs heat |
| Modified bitumen | $7 – $13 / sq ft | 15 – 25 yrs | Tough underfoot — good where there's rooftop traffic or equipment |
| Roof recover / coating | $4 – $8 / sq ft | 10 – 18 yrs | Extends life without a tear-off — only when the deck is still sound |
Costs are typical installed GTA ranges for 2026 and shift with insulation, deck condition, drainage corrections, and roof access. We confirm exact numbers in a free written proposal.
A commercial flat roof has a middle option residential roofs rarely do: a recover or restoration coating that buys years without a full tear-off — but only when the deck and insulation underneath are still dry. We take a core sample when needed so the call is based on what's actually under the membrane.
Ranges below reflect typical Buildoreno commercial flat-roofing pricing across the GTA in 2026. The biggest drivers are the system, the amount and type of insulation, deck condition, drainage corrections, and roof access. Every quote is a free, itemized written proposal — these numbers are for planning, not a contract.
| Project | Scope | Price range | Notes |
|---|---|---|---|
| TPO membrane (replacement) | Per sq ft installed | $8 – $14 | Reflective, heat-welded seams; most common new install |
| EPDM membrane (replacement) | Per sq ft installed | $7 – $12 | Proven rubber membrane, budget-friendly |
| Modified bitumen (replacement) | Per sq ft installed | $7 – $13 | Durable for foot traffic and equipment |
| Roof recover / restoration | Per sq ft | $4 – $8 | Extends life without tear-off — if the deck is sound |
| Small commercial roof | ≈5,000 sq ft building | $40,000 – $90,000 | System + insulation + deck and drainage dependent |
| Repair | Seams, flashing, ponding | $500 – $5,000 | Targeted fixes; emergency leak response available |
Pricing includes tear-off or recover, insulation, drainage corrections, membrane, flashing, and disposal. We only recommend a full replacement when a repair or recover genuinely won't solve the problem.
We walk the roof, check the membrane, seams, flashing, drainage, and penetrations, and where needed take a core sample to see the insulation and deck condition underneath. You get an honest read on what's actually failing — not a guess from the surface.
We recommend the right system (TPO, EPDM, or modified bitumen) and the right path — repair, recover, or replace. If the building is larger or more specialized than our small/light-commercial focus, we'll tell you straight and point you to a dedicated commercial roofer.
You get a transparent, line-item proposal — tear-off or recover, insulation, drainage corrections, membrane, flashing, and disposal — with a clear timeline. $0 down with milestone-based payments, the same Payment Protection Promise as our residential work.
We sequence the work to keep your tenants or business running — staging, access, and noise planned around your hours where possible. Heat-welded seams, correct slope to drains, and proper flashing so water never sits.
We back the workmanship in writing on top of the manufacturer's membrane warranty, and offer a simple maintenance program — periodic inspections and minor upkeep — because a commercial flat roof lasts far longer when small issues are caught early.
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.
Tear-off, new TPO membrane, drains and flashing, heat-welded seams, with a written workmanship warranty.
or about $64/mo†Financing coming soon
* Covers up to 370 sq ft of TPO at $8/sq ft on a single-level residential flat roof with clear access. Modified bitumen from $10/sq ft. Larger roofs and insulation upgrades are priced from your free measure. Our minimum project is $3,000. Plus HST; permits billed at cost.
Price my flat roof →A full walk of the roof, attic and flashing with photos and a written report. $50 refundable deposit to book; the fee is credited against the work (up to 10% of the quote).
Book an inspection →Most flat roof leaks start at a blocked drain. Every replacement includes clearing and resealing every drain and scupper on the roof.
Claim this offer →† Illustrative monthly payment at 9.99% APR over 60 months, before HST. Financing is coming soon and subject to approval; terms may differ.
Book a free on-site roof assessment. We'll inspect the membrane, take a core sample where needed, recommend repair, recover, or replace honestly, and give you an itemized written proposal. $0 down, milestone-based payments, work sequenced around your tenants.
Call (647) 254-0877
