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
Markham holds nineteenth century village stock and 2010s subdivision on the same municipal map. Those are different buildings with different failures, and we work both.


Four core services, each with bespoke local knowledge applied to Markham's specific building types and conditions.
01Flat, shingle, metal. Commercial and residential.
02Below grade. Balcony. Terrace. Parking deck.
0324 hours a day. On site within 60 minutes across the GTA.
04Comprehensive reports a lender will accept.
01Flat, shingle, metal. Commercial and residential.
02Below grade. Balcony. Terrace. Parking deck.
0324 hours a day. On site within 60 minutes across the GTA.
04Comprehensive reports a lender will accept.
Active leaks anywhere in the GTA get same-day priority dispatch. We answer at 2am, including weekends and holidays.
Complete liability coverage on every job. All work is documented and you are protected from start to finish.
Inspection reports, repair documentation, and scope estimates in writing before we touch anything.
We've worked on tens of thousands of GTA buildings. We recognise failure patterns before they become emergencies.
We trace the actual failure mode before proposing a scope, and we quote what that scope requires rather than inventing urgency.
“A crew that only knows subdivision work will damage a Unionville heritage roof, and a heritage specialist will overcharge for a Cathedraltown reroof that needs nothing unusual. Markham has a great deal of both, so we staff both kinds of job from the same North York shop, and the crew that turns up on a Markham Village roof or a Cornell one has worked on that kind of building before.”
Active leaks anywhere in the GTA get same-day priority dispatch. We answer at 2am, including weekends and holidays.
Complete liability coverage on every job. All work is documented and you are protected from start to finish.
Inspection reports, repair documentation, and scope estimates in writing before we touch anything.
We've worked on tens of thousands of GTA buildings. We recognise failure patterns before they become emergencies.
We trace the actual failure mode before proposing a scope, and we quote what that scope requires rather than inventing urgency.
“A crew that only knows subdivision work will damage a Unionville heritage roof, and a heritage specialist will overcharge for a Cathedraltown reroof that needs nothing unusual. Markham has a great deal of both, so we staff both kinds of job from the same North York shop, and the crew that turns up on a Markham Village roof or a Cornell one has worked on that kind of building before.”
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.
Blue Knight was, by far, the best. Responsive, ethical, totally professional — and their crew went above and beyond at no extra charge.
They installed a full new roof in one day. The crew worked around the house without us hardly knowing they were there.
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.
Luciano did not try to sell me a new roof. Appreciated the honesty — he showed up when he said he would.
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.
Flat roof replacement on a commercial unit. Clean, fast, no surprises on the invoice. The crew left the site cleaner than they found it.
Called after a storm damaged our roof. Someone was on site within hours, tarped everything, and had us fully repaired before the next rain.
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.
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.
From downtown Toronto to the 905 and beyond, one crew, one warranty, twenty-five years of GTA rooflines.
Service availability may vary. Call (647) 383-8664 to confirm coverage for your area.
From downtown Toronto to the 905 and beyond, one crew, one warranty, twenty-five years of GTA rooflines.
Service availability may vary. Call (647) 383-8664 to confirm coverage for your area.
We work across all areas of Markham. If you don't see your neighbourhood listed, we almost certainly cover it.
Every neighbourhood, from Milliken and German Mills along the Toronto boundary up through Unionville and Markham Village to Victoria Square and Cathedraltown. Western and central Markham are the quickest for us to reach, while Cornell and the eastern edge add drive time, so the arrival window you get is worked out for your street and not averaged across the whole city.
Structural roof changes and foundation alterations need a permit from Markham's building department at the Civic Centre on Highway 7, and we handle that application for you, while replacing a roof with the same system on the same structure usually needs none. Heritage is the second check here, because exterior alterations on designated property in Unionville and Old Markham Village go through their own review. We confirm whether your address is affected before quoting, so the schedule allows for it.
Yes, and on those buildings the hard part is usually sourcing the material rather than doing the repair. Slate from different quarries rarely agrees in colour or thickness, cedar weathers to a different grey depending on its age, and old sheet metal carries a patina that new stock will not have for decades, so a patch made from whatever the supplier had on the shelf stands out from Main Street Unionville for good. Our estimate names the exact material we plan to use, not just a category.
Because Markham went up in separate waves, each with its own materials and habits: nineteenth century in Unionville and Markham Village, postwar in Milliken and German Mills, and subdivision from the 1980s onward in Berczy, Cornell, and Cathedraltown. Each group reaches its weak points on its own timetable, so two houses that look alike from the curb can have nothing in common on the roof or below grade. We have been in business since 1999, with York Region part of our work for most of that time, and the era of a street tells us where to start looking before the ladder goes up.
Yes, standing seam and steel, and the question comes up most in Berczy and the other 1990s and 2000s subdivisions, where owners at first replacement are choosing between a second asphalt roof and metal. We check the deck and the attic ventilation before quoting, because metal laid over a damp, poorly vented attic carries the same condensation problem into its next life. On designated property in Unionville or Old Markham Village a change of roofing material counts as an exterior alteration and goes through that review first, and our metal roofing service page covers the systems in detail.
Yes, on condo buildings along the Highway 7 corridor and in the older mid rise stock, and on houses where a balcony or terrace sits over a finished room. The concrete is rarely what goes first: the membrane or the sealant at the railing posts and slab edge fails, water works into the slab, and the cracking and spalling follow. For a condo we write the report so a board can approve the work against its reserve fund, and our balcony repair and waterproofing service explains the process.
Markham divides usefully by age rather than by geography. The oldest fabric sits in two pockets, Old Markham Village and Unionville, both of them heritage sensitive and both of them containing buildings that predate every assumption a modern roofing crew brings to a job. Around them, Milliken and German Mills are postwar. Berczy, Cathedraltown, Cornell, and Greensborough are subdivision from the 1980s onward, laid out fast and largely uniform street by street.
That sameness works in an owner's favour. Houses on a Cathedraltown or Berczy crescent were framed, shingled, and backfilled in the same season by the same trades, so when one of them develops a problem the rest of the street tends to follow within a season or two, and we can describe what is coming with more confidence than in a city that grew lot by lot.
We diagnose before we price. On a roof that means following the leak path from both sides until we can say precisely what failed. On a foundation it means finding where water is actually entering.
You get that finding in writing, with dated photographs, before any price is attached to it: what failed, the reason it failed, and what a lasting repair requires. For a Unionville or Markham Village building the report goes further and lists each roofing material by type, because the material decides what the next repair costs and which trades can be trusted with it.
Two parts of Markham sit outside the era pattern. Lots near the Rouge River and its tributaries, in and around Unionville especially, stand on wetter ground each spring than the rest of the city, and the older houses there often have stone or early block foundations with no exterior coating at all, so their basements leak through mortar joints rather than at a single crack.
Along Highway 7 the work is commercial and multi residential: flat membrane roofs, concrete balconies, and underground parking. On those buildings a board or property manager usually needs a written condition report before anything can be approved, and ours are written with that reader in mind.
Markham has a longer construction history than its reputation as a technology corridor suggests. Old Markham Village and Unionville carry nineteenth and early twentieth century residential and commercial buildings, some of them heritage designated. The postwar expansion added 1950s through 1970s housing around Milliken and German Mills. The 1980s through 2000s growth produced the bulk of the city in Berczy, Cathedraltown, and Cornell, and the current era is adding density along Highway 7.
Those eras fail differently and on different schedules. Heritage roofs in Unionville need matched material and somebody who will not put a modern asphalt patch on a nineteenth century roofline. The 1990s and 2000s subdivisions are reaching first replacement now, and the recurring problem there is attic ventilation that was marginal when built and was frequently made worse by a later insulation upgrade.
Below grade, most of Markham sits on soil that drains slowly, and the foundations poured through the subdivision booms received a sprayed damp proofing coating rather than waterproofing. That coating is reaching the end of its service life across whole neighbourhoods at once, which is why one street can produce several wet basements in the same spring.
A crew that only knows subdivision work will damage a Unionville heritage roof, and a heritage specialist will overcharge for a Cathedraltown reroof that needs nothing unusual. Markham has a great deal of both, so we staff both kinds of job from the same North York shop, and the crew that turns up on a Markham Village roof or a Cornell one has worked on that kind of building before.
Markham has a longer construction history than its reputation as a technology corridor suggests. Old Markham Village and Unionville carry nineteenth and early twentieth century residential and commercial buildings, some of them heritage designated. The postwar expansion added 1950s through 1970s housing around Milliken and German Mills. The 1980s through 2000s growth produced the bulk of the city in Berczy, Cathedraltown, and Cornell, and the current era is adding density along Highway 7.
Those eras fail differently and on different schedules. Heritage roofs in Unionville need matched material and somebody who will not put a modern asphalt patch on a nineteenth century roofline. The 1990s and 2000s subdivisions are reaching first replacement now, and the recurring problem there is attic ventilation that was marginal when built and was frequently made worse by a later insulation upgrade.
Below grade, most of Markham sits on soil that drains slowly, and the foundations poured through the subdivision booms received a sprayed damp proofing coating rather than waterproofing. That coating is reaching the end of its service life across whole neighbourhoods at once, which is why one street can produce several wet basements in the same spring.
"A crew that only knows subdivision work will damage a Unionville heritage roof, and a heritage specialist will overcharge for a Cathedraltown reroof that needs nothing unusual. Markham has a great deal of both, so we staff both kinds of job from the same North York shop, and the crew that turns up on a Markham Village roof or a Cornell one has worked on that kind of building before."
Blue Knight, Markham
We come to you, assess the roof, and give you a written quote. You are not obliged to proceed. Most estimates completed same week.