
Registered & Insured · BBB Accredited · Serving the Greater Toronto Area


GTA's Flat Roofing Specialists · 25+ Years
Registered & Insured
Serving the Greater Toronto Area
Leaking, ponding, aging membrane? Book a free inspection and get a straight answer on what your flat roof actually needs.
150+
Flat roofs completed
4.8★
Google rating
24hr
Emergency response
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15% off the entire installation — book before Tuesday, October 13
Why Flat Roof Experts Matter
Ponding water is the #1 cause of flat roof failure. We ensure minimum 1/4" per foot slope and proper drain, scupper, or gutter placement — so water never sits.
Most flat roof leaks start at seams. Our TPO and modified bitumen installations use heat-welded seams that create a monolithic, watertight membrane — not glued joints that peel over time.
We install to each manufacturer's published specification, which is what keeps their material warranty valid — so you get a real warranty backed by the manufacturer, not just a handshake from a contractor.
White TPO membranes reflect sunlight instead of absorbing it. Commercial clients regularly report 15–25% cooling cost reductions after switching from dark roofing.
Proper Drainage Engineering
Ponding water is the #1 cause of flat roof failure. We ensure minimum 1/4" per foot slope and proper drain, scupper, or gutter placement — so water never sits.
Heat-Welded Seams That Last
Most flat roof leaks start at seams. Our TPO and modified bitumen installations use heat-welded seams that create a monolithic, watertight membrane — not glued joints that peel over time.
20–30 Year Manufacturer Warranties
We install to each manufacturer's published specification, which is what keeps their material warranty valid — so you get a real warranty backed by the manufacturer, not just a handshake from a contractor.
Energy Savings with Reflective Membranes
White TPO membranes reflect sunlight instead of absorbing it. Commercial clients regularly report 15–25% cooling cost reductions after switching from dark roofing.
What to Expect
Tell Us About Your Roof
Fill out the form or call us. Share what's going on — leaks, age, concerns.
We Schedule a Visit Within 48 Hours
We'll confirm a specific date and time for your free on-site inspection.
On-Site Inspection with Photos
Our specialist inspects the membrane, seams, flashing, drainage, and insulation. Everything is documented with photos.
Written Report & Quote Within 2 Days
You receive a detailed report of findings plus a transparent, itemized quote with material options and timeline.
Why Buildoreno
Honest material recommendations
We'll walk you through exactly what each material option means for your roof's lifespan, performance, and budget. If a 20-year TPO membrane is overkill for your situation, we'll tell you. You get the full picture — then you decide.

15-year warranty — and we'll be here to honor it
We offer 15-year warranties on premium membrane installations. With 25+ years in business and 500+ completed projects across the GTA, we're not going anywhere. No disappearing acts, no dodged phone calls, no dishonored warranties.
Full photo documentation of every job
Every flat roof project gets complete photo documentation — before, during, and after. You'll see exactly what condition your deck was in, what work was done, and what your finished roof looks like up close. No guesswork, no taking our word for it.

Our Work

Flat Roof Oakville
Full flat roof replacement in Oakville using a 2-ply SBS modified bitumen system — a watertight, low-maintenance roof with decades of service life ahead.
Completed 2024

Pavilion Flat Roof in Markham
Durable 2-Ply Modified Bitumen Flat Roof Installation on Residential Pavilion.
Completed 2025
Get a ballpark estimate in under 30 seconds — no contact info required.
Reviews
4.8
Google rating · verified clients
Every review is from a verified GTA homeowner. Ask us for references on a project like yours — we'll provide three.
Read all our reviews"Chris and the team at BuildoReno were great to work with. They raised my ceilings and delivered quality structural work at a fair price, finishing the job quickly and efficiently. The final result was better than I expected and far superior to a similar project I had done years ago with another contractor. I would absolutely recommend them."
Mark Lysenko · Google review
"Absolutely thrilled with our experience working with Buildoreno and we love our new backyard! From our initial meeting through to completion, Patrick, Chris and the crew were great to work with. Communicative, professional and they delivered on time, and as envisioned. We are already discussing and scoping our next project with them."
Gemma Cutler · Google review
"Chris gave excellent advice during the planning and design and did an excellent job in the construction of the garage. Thank you for your hard work!"
Sue Johnson · Google review
Trust & Credentials
WSIB Covered
Google Verified
$2M Liability
Manufacturer Specs
Common Questions
Yes — the inspection is completely free with no obligation. We'll inspect your flat roof, document our findings with photos, and provide a detailed quote. If you decide not to proceed, you still walk away with useful information about your roof's condition.
It depends on the roof's age and condition. If the membrane is under 15 years old and the damage is localized (a few seams, flashing issues), repair is usually the right call. If you're seeing widespread blistering, multiple leak points, or ponding water from poor slope, replacement is the better investment. We'll give you an honest recommendation during the inspection — we don't push replacements when a repair will do.
For most GTA properties, we recommend TPO (thermoplastic polyolefin). It's energy-efficient, has excellent heat-welded seams, and comes with strong manufacturer warranties. For budget-conscious projects, EPDM rubber is a proven, cost-effective option. For roofs with heavy foot traffic or equipment, modified bitumen provides superior puncture resistance. We'll recommend the best fit during your inspection.
Most residential flat roofs take 2–4 days. Commercial roofs vary based on size — a typical 3,000–5,000 sq ft commercial roof takes about a week. We schedule work to minimize disruption to your business or tenants and provide a specific timeline in your quote.
Yes — we offer 24-hour emergency response for active leaks. We'll get a temporary repair in place to stop the water damage, then schedule a full inspection to determine the permanent fix. Call us directly for emergencies.
Ponding water (water that sits for 48+ hours after rain) is the #1 cause of flat roof failure. It accelerates membrane breakdown, adds structural load, and breeds algae. During our inspection, we specifically check for ponding areas and drainage issues. The fix usually involves installing tapered insulation to create proper slope or adding additional drains.
Free on-site assessment. No pressure.
We'll tell you if it makes sense for your home.
15% off entire installation — book before Tuesday, October 13
150+
Flat roofs completed
4.8★
Google rating
24hr
Emergency response