Licensed & Insured · Serving the Greater Toronto Area
GTA's Flat Roofing Specialists · 25+ Years
Licensed & Insured
Serving the Greater Toronto Area
Flat Roofing Experts in the GTA — Repairs, Replacements & New Installs
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
Scroll to explore
15% off the entire installation — book before Friday, May 22
Call +1 647-254-0877
Why Flat Roof Experts Matter
Flat roofs fail when they're treated like sloped roofs
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're certified installers for major flat roofing manufacturers. That means real warranties 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're certified installers for major flat roofing manufacturers. That means real warranties 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
Here's how it works
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
How we work differently
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.
Want to know how much this could cost?
Get a ballpark estimate in under 30 seconds — no contact info required.
Reviews
What Our Clients Say
Real feedback from homeowners across the GTA who trusted us with their projects.
★
★
★
★
★
“Fast quote, even faster turnaround. The crew respected the property and kept everything tidy.”
Alana R.
Google Review
★
★
★
★
★
“They lowered our basement by 2 feet and the whole process was smoother than I expected. Engineering handled, permits handled, clean crew. Highly recommend.”
Michael T.
Underpinning
★
★
★
★
★
“We hired Buildoreno for a full exterior refresh. The communication was clear and the quality is excellent.”
Jesse M.
Google Review
★
★
★
★
★
“Our metal roof looks incredible and we finally don't have to worry about leaks every spring. Worth every penny for the peace of mind.”
Sarah & David K.
Metal Roofing
★
★
★
★
★
“They reinforced our foundation and handled the permits. Couldn't have asked for a smoother process.”
Priya S.
Google Review
★
★
★
★
★
“Complete backyard transformation. New patio, walkways, lighting, plantings—everything. Our kids basically live outside now.”
Jennifer L.
Landscaping
★
★
★
★
★
“Our backyard looks like a resort now. Great ideas, great execution.”
Miguel T.
Google Review
★
★
★
★
★
“Our condo board hired them after two failed repairs from other companies. They found the real issue — bad drainage — and fixed it properly. No leaks since.”
Maria D.
Flat Roofing
★
★
★
★
★
“Solid workmanship and a trustworthy team. We'll be calling them back for the next phase.”
Diane K.
Google Review
★
★
★
★
★
“Emergency call on a Sunday morning for a commercial roof leak. They were there by noon and had a temporary fix in place before end of day. Full replacement done the following week.”
James H.
Flat Roofing
★
★
★
★
★
“Had our flat roof replaced with TPO after years of patching. The crew was professional, finished on time, and the new membrane has been completely leak-free through two winters. Milestone billing was a huge plus.”
Raj P.
Flat Roofing
★
★
★
★
★
“Fast quote, even faster turnaround. The crew respected the property and kept everything tidy.”
Alana R.
Google Review
★
★
★
★
★
“They lowered our basement by 2 feet and the whole process was smoother than I expected. Engineering handled, permits handled, clean crew. Highly recommend.”
Michael T.
Underpinning
★
★
★
★
★
“We hired Buildoreno for a full exterior refresh. The communication was clear and the quality is excellent.”
Jesse M.
Google Review
★
★
★
★
★
“Our metal roof looks incredible and we finally don't have to worry about leaks every spring. Worth every penny for the peace of mind.”
Sarah & David K.
Metal Roofing
★
★
★
★
★
“They reinforced our foundation and handled the permits. Couldn't have asked for a smoother process.”
Priya S.
Google Review
★
★
★
★
★
“Complete backyard transformation. New patio, walkways, lighting, plantings—everything. Our kids basically live outside now.”
Jennifer L.
Landscaping
★
★
★
★
★
“Our backyard looks like a resort now. Great ideas, great execution.”
Miguel T.
Google Review
★
★
★
★
★
“Our condo board hired them after two failed repairs from other companies. They found the real issue — bad drainage — and fixed it properly. No leaks since.”
Maria D.
Flat Roofing
★
★
★
★
★
“Solid workmanship and a trustworthy team. We'll be calling them back for the next phase.”
Diane K.
Google Review
★
★
★
★
★
“Emergency call on a Sunday morning for a commercial roof leak. They were there by noon and had a temporary fix in place before end of day. Full replacement done the following week.”
James H.
Flat Roofing
★
★
★
★
★
“Had our flat roof replaced with TPO after years of patching. The crew was professional, finished on time, and the new membrane has been completely leak-free through two winters. Milestone billing was a huge plus.”
Raj P.
Flat Roofing
4.9
Google Rating
150+
Reviews
98%
Would Recommend
Trust & Credentials
Licensed, insured, verified
WSIB Covered
Google Verified
$5M Liability
Certified Installers
Common Questions
Frequently asked 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.
Ready to talk free flat roof inspection?
Free on-site assessment. No pressure.
We'll tell you if it makes sense for your home.
© 2026 Buildoreno. All rights reserved.
15% off entire installation — book before Friday, May 22
150+
Flat roofs completed
4.8★
Google rating
24hr
Emergency response