Flat Roof Replacement
Tear-off or recover of low-slope roofs, with new tapered insulation, drains, curbs and parapet flashings. Read how we plan commercial flat roof replacement around occupied buildings.
Ottawa Commercial Roofing
Commercial Roofing Contractors in Ottawa
Ottawa Roofing Pros is a commercial roofing contractor that installs, replaces and repairs low-slope and metal roofs on Ottawa offices, plazas, warehouses, condos and institutional buildings. Roofing is all we do, and our phones are answered 24/7.
Our crews have more than 17 years on Ottawa roofs and over 1,500 completed jobs. We work with TPO, EPDM, PVC, two-ply SBS modified bitumen, built-up roofing, metal and restoration coatings.
Owners, facility teams, property managers and condo boards get the same thing from us: a moisture-checked assessment, a written scope, a schedule built around tenants and a close-out package they can file.
Commercial Roofing Services for Ottawa Buildings
We handle the full life of a commercial roof: replacing it, repairing it, keeping it maintained and restoring it when a full tear-off isn't needed yet.
Most clients start with an assessment, where we tell you plainly whether the roof needs repair, restoration or replacement.
Roof Repair and Leak Response
Seams, blisters, flashing failures and ponding, on every membrane type. Our commercial roof repair service runs 24/7 and ends with a written photo report.
Preventative Maintenance
Spring and fall inspections, drain clearing, minor repairs and winter monitoring. Our roof maintenance programs keep records that manufacturers ask for at claim time.
Coatings and Restoration
Silicone and acrylic systems that can add years to a sound but aging roof. A moisture survey confirms whether your roof qualifies for commercial roof coatings and restoration.
Buildings We Work On
Ottawa's commercial stock is unusual: high-tech campuses, a large federal footprint, suburban plazas and a growing number of condo corporations. Each building type brings its own access rules, tenants and rooftop equipment.
Offices and Tech Campuses in Kanata North
The Kanata North tech park around March Road and Legget Drive houses hundreds of companies, often with labs and server rooms under the roof. We schedule noisy tear-off after hours and protect rooftop equipment. See our work on commercial roofing in Kanata.
Government and Institutional Facilities
Federal and institutional sites expect documentation: safety plans, WSIB clearance, insurance certificates and detailed submittals. Some federal contracts also require personnel screening through Public Services and Procurement Canada's Contract Security Program, so we confirm those requirements before bidding.
Retail Plazas and Restaurants
Plazas must stay open, so we stage materials away from entrances and keep storefronts dry each night. Restaurant grease exhaust breaks down some membranes, so we use grease-resistant membranes and containment around kitchen fans. We roof many plazas along Merivale Road as part of our roofing work in Nepean.
Warehouses and Industrial Buildings
Large low-slope areas over steel decks, skylights and loading docks are typical here, along with aging metal roofs that suit a retrofit. Light industrial roofs near the airport are a regular call for our Gloucester roofers.
Condominiums and Multi-Unit Residential
Condo boards need roof reports they can use in reserve fund studies, plus clear notices for residents. Our page on roofing for property managers and condo boards explains how we support boards and managers.
Roofing Systems We Install
We install every major low-slope system, and the right one depends on traffic, rooftop equipment, budget and how long you plan to hold the building. Lifespans below assume regular maintenance. Warranty terms depend on the manufacturer, the system build-up and registration.
| System | Typical lifespan | Best use | Manufacturer warranty options |
|---|---|---|---|
| TPO (single-ply) | 20 to 30 years | Reflective roofs, offices, retail | Commonly 10 to 30 years |
| EPDM (single-ply) | 25 to 30+ years | Large plain roofs, warehouses | Commonly 10 to 30 years |
| PVC (single-ply) | 20 to 30 years | Restaurants, grease and chemical exposure | Commonly 10 to 30 years |
| Two-ply SBS modified bitumen | 20 to 30 years | High foot traffic, complex details | Commonly 10 to 20+ years |
| Built-up roofing (BUR) | 20 to 30 years | Repairs and extensions to existing BUR | Varies by system |
| Metal (standing seam, ribbed) | 40+ years | Warehouses, sloped commercial roofs | Finish and weathertightness terms vary |
| Restoration coatings | 10 to 20 years per application | Sound roofs with dry insulation | Tied to coating thickness |
Compare membranes in detail on our TPO, EPDM and PVC single-ply roofing page, our modified bitumen and built-up roofing page and our commercial metal roofing page.
How a Commercial Roofing Project Works
Every commercial project follows the same six stages, whether it is a 3,000 sq ft plaza or a 60,000 sq ft warehouse. Tenants and boards get a schedule before work starts.
Assessment and Core Cuts
We photograph the roof and take core cuts to confirm the layers and whether the insulation is wet.
Scope and Specification
We name the membrane, insulation, drains, flashings and curb heights, or price exactly to your consultant's spec.
Proposal and Schedule
You get a fixed price, a phasing plan, a timeline and any permit needs.
Safety Plan and Site Setup
We set guardrails or warning lines, hoisting zones and protected entrances, plus a fire watch for hot work.
Installation and Daily Dry-In
We only remove what we can make watertight the same day, and seal the open edge every evening.
Close-Out Documents
You receive photos, as-built notes, our written warranty and the manufacturer warranty paperwork where one applies.
Safety, Insurance and Compliance
Commercial buyers check credentials before they check prices, and they should. Ottawa Roofing Pros is licensed, insured and covered by WSIB, and we can provide a current WSIB clearance certificate for your file.
You can verify any contractor's standing through WSIB's clearance certificate service. Ontario also requires workers who use fall protection on construction projects to complete approved working at heights training under O. Reg. 297/13, valid for three years.
Ask us for certificates of insurance naming your company or condo corporation as additional insured. We supply them before mobilizing.
What Drives Commercial Roofing Costs
Commercial single-ply replacement in Ottawa typically runs $10 to $18 per sq ft in 2026, and restoration coatings $4 to $9 per sq ft. Repairs start around $350 for minor work and run $1,200 to $3,500+ for larger repairs.
The final number depends on a few factors:
- Roof area and shape: large plain roofs cost less per sq ft than small, cut-up ones.
- Tear-off or recover: removing two old roofs costs far more than one.
- Insulation thickness: older roofs often need much more insulation to meet current energy targets.
- Rooftop units and penetrations: every curb, pipe and vent needs its own flashing.
- Access and hoisting: crane days, tight lanes and downtown traffic add cost.
- Membrane choice and warranty term: longer NDL warranties require thicker or more robust builds.
Our page on planning and budgeting a commercial re-roof breaks costs down by system. A free assessment and written quote set the actual price.
Commercial Roofing FAQs
Building owners and managers ask us these questions before almost every commercial project. Short answers come first, with links to the service pages that go deeper.
How often should a commercial roof be inspected?
At least twice a year, in spring and fall, plus after major wind or hail storms. Ottawa's freeze-thaw cycles and heavy snow make the spring visit especially important, because winter damage shows up then.
How often do you replace a commercial roof?
Most well-maintained low-slope roofs in Ottawa last 20 to 30 years, and metal roofs 40 years or more. Wet insulation, repeated leaks and rising repair bills are better signals than age alone.
Can you work while our building stays open?
Yes. Almost all of our commercial roofs are occupied during work, so we phase the roof into sections, dry in every night and schedule noise, odour and crane lifts around your tenants.
How do I choose a commercial roofer?
Ask for proof of WSIB coverage, insurance certificates and working-at-heights training. Then compare written scopes line by line, not just totals.
Also ask who issues the warranty and what keeps it valid.
Free roofing estimate
Request a Commercial Roof Assessment
Tell us the building type, roof size and any active leaks. We answer 24/7, book a free assessment at a time that suits your tenants, and follow up with a written scope and quote.
- Call or text (343) 504-9753, answered 24/7
- Email info@ottawaroofingpros.com
- Licensed, insured and WSIB covered
- Written quote and 1-year labour warranty