01Flat, shingle, metal. Commercial and residential.
Roof Repair
- Roof leak repairs
- Emergency tarping
- Storm damage repair
- Shingle repairs & replacement
- Metal roofing
- Flat roof repairs (EPDM, TPO, Mod-Bit)
- Flashing repairs
- Drain issues
Serving Oshawa
Roofing & Waterproofing in Oshawa
Oshawa's century as an auto-industry town left a dense core of workers' houses, rings of postwar subdivisions, a fast-growing north end and a large stock of flat industrial and commercial roofs, many now at a critical point in their roofing lifecycle. We diagnose each on the terms of its age and its use.
25+Years on GTA roofs
60 minEmergency response
Licensed& fully insured
GTARegion served
Our Services in Oshawa
What we do in Oshawa.
Four core services, each with bespoke local knowledge applied to Oshawa's specific building types and conditions.
0102Below grade. Balcony. Terrace. Parking deck.
Basement Waterproofing
- Basement leaks
- Below-grade waterproofing
- Sump pump installation
- Balcony leaks
- Terrace leaks
- Underground parking waterproofing
- Crack injections
- Concrete slab leaks
0324 hours a day. On site within 60 minutes across the GTA.
Emergency Roof Repair
- Flooding response
- Storm & wind damage
- Fire-related roof & building repairs
- Insurance claim support
- Temporary protection & tarping
- Structural drying coordination
- Emergency rebuilds
04Comprehensive reports a lender will accept.
Roof Inspection
- Residential inspections
- Commercial roof assessments
- Industrial inspections
- Drone inspections
- Thermal imaging
- Moisture detection
- Forensic leak investigations
- Insurance reports
01Flat, shingle, metal. Commercial and residential.
Roof Repair
02Below grade. Balcony. Terrace. Parking deck.
Basement Waterproofing
0324 hours a day. On site within 60 minutes across the GTA.
Emergency Roof Repair
04Comprehensive reports a lender will accept.
Roof Inspection
Why Blue Knight
Why Oshawa property owners choose us.
01Emergency
60-Min Response
Active leaks anywhere in the GTA get same-day priority dispatch. We answer at 2am, including weekends and holidays.
02Coverage
Licensed & Insured
Complete liability coverage on every job. All work is documented and you are protected from start to finish.
03Transparency
Written Reports Every Time
Inspection reports, repair documentation, and scope estimates in writing before we touch anything.
04Experience
25+ Years on GTA Roofs
We've worked on tens of thousands of GTA buildings. We recognise failure patterns before they become emergencies.
05Diagnosis
Find the Cause First
We trace the actual failure mode before proposing a scope, and we quote what that scope requires rather than inventing urgency.
“Oshawa puts old workers' housing, industrial flat roofs and brand-new subdivisions within a short drive of each other, and each needs its own materials and its own reading of the building's history. We bring the trades for all three, from chimney flashing on a 1920s cottage to a membrane repair on a south-end plant, with honest assessment and written documentation on every job.”
01Emergency
60-Min Response
Active leaks anywhere in the GTA get same-day priority dispatch. We answer at 2am, including weekends and holidays.
02Coverage
Licensed & Insured
Complete liability coverage on every job. All work is documented and you are protected from start to finish.
03Transparency
Written Reports Every Time
Inspection reports, repair documentation, and scope estimates in writing before we touch anything.
04Experience
25+ Years on GTA Roofs
We've worked on tens of thousands of GTA buildings. We recognise failure patterns before they become emergencies.
05Diagnosis
Find the Cause First
We trace the actual failure mode before proposing a scope, and we quote what that scope requires rather than inventing urgency.
“Oshawa puts old workers' housing, industrial flat roofs and brand-new subdivisions within a short drive of each other, and each needs its own materials and its own reading of the building's history. We bring the trades for all three, from chimney flashing on a 1920s cottage to a membrane repair on a south-end plant, with honest assessment and written documentation on every job.”
Rated 5 out of 5Blue Knight was, by far, the best. Responsive, ethical, totally professional — and their crew went above and beyond at no extra charge.
Rated 5 out of 5They installed a full new roof in one day. The crew worked around the house without us hardly knowing they were there.
Rated 5 out of 5I emailed at 4 a.m. and spoke with someone that same day. Estimate and completed work all within one day. Pricing was fair, work was excellent.
1 / 3
Rated 5 out of 5
Blue Knight was, by far, the best. Responsive, ethical, totally professional — and their crew went above and beyond at no extra charge.
Toronto, ON·Google
Rated 5 out of 5
They installed a full new roof in one day. The crew worked around the house without us hardly knowing they were there.
North York, ON·HomeStars
Rated 5 out of 5
I emailed at 4 a.m. and spoke with someone that same day. Estimate and completed work all within one day. Pricing was fair, work was excellent.
Toronto, ON·Google
Rated 5 out of 5
Luciano did not try to sell me a new roof. Appreciated the honesty — he showed up when he said he would.
Etobicoke, ON·Google
Rated 5 out of 5
We had a leak diagnosed by two other contractors who could not find the source. Blue Knight found it on the first visit and fixed it the same week.
Scarborough, ON·Google
Rated 5 out of 5
Flat roof replacement on a commercial unit. Clean, fast, no surprises on the invoice. The crew left the site cleaner than they found it.
Mississauga, ON·GuildQuality
Rated 5 out of 5
Called after a storm damaged our roof. Someone was on site within hours, tarped everything, and had us fully repaired before the next rain.
Vaughan, ON·HomeStars
Rated 5 out of 5
Had a slow basement leak for years. Every other company just caulked it. Blue Knight found the actual source and did a proper waterproofing job. No issues since.
North York, ON·Google
Rated 5 out of 5
Our neighbours recommended them for a valley repair. Small job, but they treated it like it mattered — showed up on time, matched the shingles perfectly, and charged exactly what they quoted.
Richmond Hill, ON·HomeStars
1 / 9
Roofing & Waterproofing Since 1999
Our Work.
Where We Work
Rooftops across the GTA.
From downtown Toronto to the 905 and beyond, one crew, one warranty, twenty-five years of GTA rooflines.
Toronto
Greater Toronto Area
Extended Service Area
Service availability may vary. Call (647) 383-8664 to confirm coverage for your area.
Where We Work
Rooftops across the GTA.
From downtown Toronto to the 905 and beyond, one crew, one warranty, twenty-five years of GTA rooflines.
Toronto
Greater Toronto Area
Extended Service Area
Service availability may vary. Call (647) 383-8664 to confirm coverage for your area.
Areas Served
Neighbourhoods & areas we serve in Oshawa.
We work across all areas of Oshawa. If you don't see your neighbourhood listed, we almost certainly cover it.
Central Oshawa
O'Neill
Vanier
Donevan
Eastdale
Samac
Pinecrest
Taunton
Windfields
FAQ
Oshawa roofing questions.
Homes of this age are on their third or fourth roofing cycle. Original deck condition, accumulated flashing failures and chimney masonry issues are all common, and we assess each of them from the roof and the attic before recommending anything.
Yes. We repair and maintain flat roofs on plazas, offices, warehouses and industrial buildings across Oshawa, from older plants in the south end to newer commercial space along Taunton Road, working with modified bitumen, EPDM and TPO membranes. Owners and property managers get written condition reports with dated photos, and scheduled inspections are available for buildings that need a maintenance record.
Yes. We install standing seam and steel roofing on Oshawa homes and commercial buildings, including the low-slope porches and rear additions common on older houses, where shingles do not shed water well. Ask about our metal roofing service when you book and we will give you a written estimate comparing metal with asphalt for your roof.
Yes. An Oshawa call gets a crew on site within 60 minutes, day or night, from Lakeview to Windfields. The first job is stopping the water with tarps or temporary membrane, the second is dated photographs of the damage for your insurer, and the permanent repair follows once the cause is confirmed.
Yes, including the stone, block and early poured foundations under Oshawa's older workers' housing, most built with little or no membrane. We find the entry point first, a crack, a failed cove joint, a buried downspout or water rising through the floor, and then choose between injection, a new sump, drainage repairs or a complete system based on that finding.
Yes. Pre-purchase inspections on Oshawa homes cover the roof, flashing, chimney and attic, with a written report and dated photos within 24 hours. On older houses we also note how many layers of shingles are on the roof and how the deck looks from inside, because both change what a buyer should budget for.
Yes. On older Oshawa semis the two halves of the roof often wear at different rates because each owner reroofed at a different time, and the joint along the party wall, where new meets old, is where the leaks start. We tie a new roof cleanly into the neighbour's side and flash that seam properly, and where a shared repair makes more sense, we will price it for both owners.
In Depth
Roofers in Oshawa, From the Lake to Windfields
Weather reaches Oshawa roofs differently depending on the neighbourhood. The south end runs down to Lake Ontario at Lakeview Park and the harbour, and houses there take the full force of wind off the water, which lifts shingle edges and wears lake-facing flashing first. Oshawa Creek and Harmony Creek cut wooded valleys through the city, where overhanging trees drop limbs in storms and keep roofs shaded and damp. In the open north end, young subdivisions have little shelter from gusts. Good roofers in Oshawa account for that exposure when they choose materials and fastening, not only the age of the roof.
Oshawa Roofing Contractors for Older Homes
Oshawa's workers' housing from the 1920s to 60s is among the oldest residential stock in the GTA outside central Toronto, and these buildings have decades of repair history layered on top of their original construction. Before hiring any of the Oshawa roofing contractors on your list, ask whether they will count the layers on the roof, look at the deck from the attic and treat the chimney as its own repair. We read that history in the building before proposing any work, and the estimate tells you what we found.
Commercial and Industrial Roofing in Oshawa
Oshawa's industrial and commercial corridors have extensive flat-roof stock, and many of those roofs have been patched by several contractors over the years. We work on these buildings with the commercial membrane expertise they require, locating leaks with moisture and thermal scans before cutting in, repairing seams, drains and curbs, and planning overlays or full replacements when repairs stop paying off. Each visit ends with a written report and dated photos for property management, lenders and lease review.
Nearby Service Areas
Other areas we serve near Oshawa.
About Oshawa
What we know about buildings in Oshawa.
Oshawa's identity as Canada's automotive capital shaped its building stock. Decades of auto industry employment created substantial residential neighbourhoods of 1920s to 1960s housing, workers' cottages, semis and bungalows built in waves that followed the factory expansions. That stock is now 60 to 100 years old and has been reroofed several times, often over plank sheathing, with chimneys, porches and rear additions that each carry their own history of patching.
Around that core, O'Neill, Vanier, Donevan, Eastdale, Samac and Pinecrest filled in over the postwar decades and into the 1980s with bungalows, split-levels and modest two-storey houses, most of them reroofed at least twice by now. North of Taunton Road, Windfields and the streets near the university and college campus are the newest part of the city, with 2000s and 2010s roofs whose trouble usually comes from installation details rather than age. The address is only a starting point, so we confirm on the roof.
The commercial and industrial side of Oshawa is just as varied. Simcoe Street, King Street and the south-end industrial blocks carry flat roofs that range from original 1940s construction to recent retail, many reroofed or overlaid more than once and crowded with rooftop equipment. Taunton Road and the north-end plazas are newer, but they bring large roof areas with more drains, seams and curbs to keep watertight.
Our Oshawa work covers everything from a single leak to a complete reroof, new chimney flashing, standing seam and steel metal roofing, and commercial and industrial flat roofing in modified bitumen, EPDM and TPO. The waterproofing side takes in wet basements, foundation cracks, sump installations and yard drainage, along with balcony and parking deck waterproofing for apartment and condo buildings. Emergency crews tarp roofs day and night, inspections draw on drone, thermal and moisture tools, and owner-occupiers, landlords and property managers all get the same written reports with dated photos.
Oshawa puts old workers' housing, industrial flat roofs and brand-new subdivisions within a short drive of each other, and each needs its own materials and its own reading of the building's history. We bring the trades for all three, from chimney flashing on a 1920s cottage to a membrane repair on a south-end plant, with honest assessment and written documentation on every job.
About Oshawa
What we know about buildings in Oshawa.
Oshawa's identity as Canada's automotive capital shaped its building stock. Decades of auto industry employment created substantial residential neighbourhoods of 1920s to 1960s housing, workers' cottages, semis and bungalows built in waves that followed the factory expansions. That stock is now 60 to 100 years old and has been reroofed several times, often over plank sheathing, with chimneys, porches and rear additions that each carry their own history of patching.
Around that core, O'Neill, Vanier, Donevan, Eastdale, Samac and Pinecrest filled in over the postwar decades and into the 1980s with bungalows, split-levels and modest two-storey houses, most of them reroofed at least twice by now. North of Taunton Road, Windfields and the streets near the university and college campus are the newest part of the city, with 2000s and 2010s roofs whose trouble usually comes from installation details rather than age. The address is only a starting point, so we confirm on the roof.
The commercial and industrial side of Oshawa is just as varied. Simcoe Street, King Street and the south-end industrial blocks carry flat roofs that range from original 1940s construction to recent retail, many reroofed or overlaid more than once and crowded with rooftop equipment. Taunton Road and the north-end plazas are newer, but they bring large roof areas with more drains, seams and curbs to keep watertight.
Our Oshawa work covers everything from a single leak to a complete reroof, new chimney flashing, standing seam and steel metal roofing, and commercial and industrial flat roofing in modified bitumen, EPDM and TPO. The waterproofing side takes in wet basements, foundation cracks, sump installations and yard drainage, along with balcony and parking deck waterproofing for apartment and condo buildings. Emergency crews tarp roofs day and night, inspections draw on drone, thermal and moisture tools, and owner-occupiers, landlords and property managers all get the same written reports with dated photos.
"Oshawa puts old workers' housing, industrial flat roofs and brand-new subdivisions within a short drive of each other, and each needs its own materials and its own reading of the building's history. We bring the trades for all three, from chimney flashing on a 1920s cottage to a membrane repair on a south-end plant, with honest assessment and written documentation on every job."
Blue Knight, Oshawa
Ready to schedule your estimate?
We come to you, assess the roof, and give you a written quote. You are not obliged to proceed. Most estimates completed same week.