01Flat, shingle, metal. Commercial and residential.
Roof Repair
- Roof leak repairs
- Emergency tarping
- Storm damage repair
- Shingle repairs & replacement
- Flat roof repairs (EPDM, TPO, Mod-Bit)
- Flashing repairs
- Drain issues
- Rooftop troubleshooting
Serving Thornhill
Roofing & Waterproofing in Thornhill
Thornhill straddles the Markham and Vaughan boundary, and its 1980s and 90s housing is at or past a first full roofing cycle. We assess what is actually left.
25+Years on GTA roofs
60 minEmergency response
Licensed& fully insured
York RegionRegion served
Our Services in Thornhill
What we do in Thornhill.
Four core services, each with bespoke local knowledge applied to Thornhill's specific building types and conditions.
01
02Below 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 Thornhill 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.
“Thornhill's roofs are old enough that most owners are being told they need replacing, and a meaningful share of them do not. Establishing which is which takes opening a section rather than looking from the driveway, and it is the difference between a repair and five figures.”
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.
“Thornhill's roofs are old enough that most owners are being told they need replacing, and a meaningful share of them do not. Establishing which is which takes opening a section rather than looking from the driveway, and it is the difference between a repair and five figures.”
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
GTA Roofing Projects Since 1999
Featured Projects.
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 Thornhill.
We work across all areas of Thornhill. If you don't see your neighbourhood listed, we almost certainly cover it.
Thornhill Village
Carrville
Royal Orchard
Brownridge
Crestwood-Springfarm
Bayview Fairway
Commerce Valley
Uplands
FAQ
Thornhill roofing questions.
Both sides of Yonge, from Thornhill Village and Royal Orchard through Brownridge and Crestwood-Springfarm on the Vaughan side to Bayview Fairway, Uplands, and Commerce Valley on the Markham side. It is a compact area close to our shop and we hold a consistent response window across it.
It depends which side of Yonge Street you are on. West of Yonge falls under the City of Vaughan, east of Yonge under the City of Markham, and the two have different processes and different fees. We establish which applies before quoting and file the application ourselves, which avoids the delay that catches contractors unfamiliar with the split.
Yes. That corridor runs largely on flat membrane systems, and they fail at drains that have ponded long enough to soften the substrate and at lap seams that have lost adhesion rather than in the open field. Reports are written in a format a property manager can put straight into a reserve fund file.
Thornhill has been steady work for us throughout the twenty five years we have been operating across the region. The housing is uniform enough that repetition pays: when one house on a street fails a particular way, its neighbours are usually a season or two behind it, and we can tell an owner what to expect with real confidence.
In Depth
Where We Work in Thornhill
Yonge Street divides Thornhill administratively but not physically, and the housing on both sides came out of the same construction era to much the same specification. Thornhill Village at the centre holds the oldest fabric, some of it predating the subdivisions around it by a century. Royal Orchard, Brownridge, and Crestwood-Springfarm run west toward Bathurst. Bayview Fairway and Uplands run east toward Bayview, and Commerce Valley is the commercial edge at Highway 7.
For most jobs the practical consequence of the split is administrative rather than technical. The building is the same on either side of the street; the paperwork is not.
How We Work in Thornhill
The first visit is diagnostic. We trace a roof leak from inside and outside until we can name what failed, and we find a foundation entry point rather than reporting the water on the floor.
The written report that follows names what failed, why, and what fixing it properly involves. We repair what can be repaired and say plainly when it cannot, which on housing of this age is a conversation we have several times a week.
Nearby Service Areas
Other areas we serve near Thornhill.
About Thornhill
What we know about buildings in Thornhill.
Thornhill is a neighbourhood rather than a municipality, split down Yonge Street between Markham on the east and Vaughan on the west. That matters practically: the permit office, the property standards rules, and the municipal contact all change depending on which side of Yonge a house sits on, and a contractor who does not know that wastes a week finding out.
The housing is mostly 1980s and 1990s subdivision, detached and semi detached, built during the York Region expansion. Those roofs are at or past a first full cycle now, and they are failing in a predictable order: sealant strips first, then the nail line, then wind loss on the exposed slope.
The detail that catches people out here is the flat section. A great many Thornhill houses carry a flat or near flat roof over a garage, a rear addition, or a porch, and those were built with early modified bitumen or EPDM that has long since gone brittle. That section is almost always the part that leaks, and it needs membrane work rather than shingle work.
Thornhill's roofs are old enough that most owners are being told they need replacing, and a meaningful share of them do not. Establishing which is which takes opening a section rather than looking from the driveway, and it is the difference between a repair and five figures.
About Thornhill
What we know about buildings in Thornhill.
Thornhill is a neighbourhood rather than a municipality, split down Yonge Street between Markham on the east and Vaughan on the west. That matters practically: the permit office, the property standards rules, and the municipal contact all change depending on which side of Yonge a house sits on, and a contractor who does not know that wastes a week finding out.
The housing is mostly 1980s and 1990s subdivision, detached and semi detached, built during the York Region expansion. Those roofs are at or past a first full cycle now, and they are failing in a predictable order: sealant strips first, then the nail line, then wind loss on the exposed slope.
The detail that catches people out here is the flat section. A great many Thornhill houses carry a flat or near flat roof over a garage, a rear addition, or a porch, and those were built with early modified bitumen or EPDM that has long since gone brittle. That section is almost always the part that leaks, and it needs membrane work rather than shingle work.
"Thornhill's roofs are old enough that most owners are being told they need replacing, and a meaningful share of them do not. Establishing which is which takes opening a section rather than looking from the driveway, and it is the difference between a repair and five figures."
Blue Knight, Thornhill
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.