# Pressure Washing Markham | Power Pressure Washing > Pressure washing in Markham. Serving Unionville, Cornell and Angus Glen. Roof soft wash, siding, interlock reseal. Call (647) 277-5411. URL: https://powerpressurewashingtoronto.ca/service-areas/markham/ ![Power washing crew cleaning a driveway on a tree-lined GTA street](/images/misc/power-washing-crew-in-deep-blue-shirts-cleaning-dr.webp) # Pressure Washing in Markham for Roofs, Siding and Interlock Last updated: October 17, 2026 Serving Unionville, Markham Village, Cornell and more Pressure washing in Markham for shaded heritage roofs in Unionville, large interlock driveways in Angus Glen and Cathedraltown, and vinyl siding in Cornell. Roof soft washing, interlock restoration and house washing with written per-surface quotes. - Local crews, three rigs per truck - Same-week booking - 24/7 phone 20+ YRS GTA Combined $2M COI Liability + WSIB 3 RIGS Hot, Cold, Soft Request a Free Written Quote [#quote →](#quote) Call (647) 277-5411 [tel:+16472775411 →](tel:+16472775411) Quote in Markham Fixed per-surface pricing. No hidden trip fees. Thanks, we got your request. We confirm a written per-surface quote, usually the same day. Need it faster? Call (647) 277-5411. - 20+ Yrs Combined GTA Experience - $2M Liability + WSIB - 10 GTA Cities Served - 24/7 Phone Answered - 24 Hrs Commercial COI ## Moss, Algae and Loose Joints: Markham Pressure Washing Issues ### Black-streaked roofs on shaded Unionville and Markham Village streets North-facing shingles turn black and green, moss lifts the tabs, and the streaks return a season after a quick pressure wash. **Why it happens here:** Both villages are heritage conservation districts with older homes under mature silver maples and oaks, so shaded roofs stay damp long after rain and feed Gloeocapsa magma. **What we do:** Roof cleaning with the SoftWash low-pressure line kills the algae and moss at the root without stripping granules, and gardens are pre-wet first. 1\. Road salt Chloride soaks into concrete pores and leaves white efflorescence. Cold pressure alone will not lift set salt; 200F hot water dissolves and flushes it. 2\. Freeze-thaw Water in mortar and interlock joints freezes, expands and blows out polymeric sand. Cleaning plus a same-visit reseal stops next winter's damage. 3\. Shade and humidity Algae on north walls, moss on walkways and black streaks on shingles. A low-pressure soft wash kills the growth at the root instead of blasting it. Most requested locally ## Roof, Siding and Interlock Services ![Toronto shingle roof under maple canopy, half soft washed to show clean versus black-streaked shingles](/images/misc/asphalt-shingle-roof-of-toronto-home-under-mature-.webp) $450-$850 ### Roof Cleaning Low-pressure soft wash with sodium hypochlorite for moss, algae and black streaks on asphalt shingles, with gutter rinse and plant protection. Roof Cleaning details [Roof Cleaning →](/roof-cleaning-toronto/) ![Interlock paver driveway in Leaside after cleaning, polymeric re-sanding and sealing](/images/misc/freshly-cleaned-re-sanded-and-sealed-interlock-pav.webp) $450-$1,200 ### Interlocking Stone Cleaning Interlock specialist: precise cleaning, polymeric re-sanding and sealing in the same visit, priced at $3.50-$5.50 per sq ft for full service. Interlock details [Interlocking Stone Cleaning →](/interlocking-stone-cleaning-toronto/) ![Two-storey Toronto home with vinyl siding and brick being soft washed](/images/misc/two-storey-toronto-home-with-white-vinyl-siding-an.webp) $350-$550 ### House Washing Full-house exterior wash: soft wash for vinyl, aluminum and stucco, controlled cold pressure for brick, plants protected throughout. House Washing details [House Washing →](/house-washing-toronto/) ### More Services We Offer ![Commercial power washing crew cleaning a Toronto plaza sidewalk at dawn with a hydrovac truck recovering wash water](/images/misc/commercial-power-washing-crew-in-deep-blue-shirts-.webp) Commercial Hub ### Commercial Power Washing Commercial details [Commercial Power Washing →](/commercial-power-washing-toronto/) ![Interlock paver driveway in Leaside after cleaning, polymeric re-sanding and sealing](/images/misc/freshly-cleaned-re-sanded-and-sealed-interlock-pav.webp) ### Interlocking Stone Cleaning Interlock details [Interlocking Stone Cleaning →](/interlocking-stone-cleaning-toronto/) ![Freshly pressure washed concrete driveway and interlock walkway on a Toronto residential street](/images/misc/wet-glossy-concrete-driveway-after-hot-water-power.webp) ### Pressure Washing Pressure Washing details [Pressure Washing →](/pressure-washing-toronto/) ![Toronto condo entrance plaza and courtyard freshly pressure washed on a weekend morning](/images/misc/toronto-mid-rise-condo-building-entrance-plaza-and.webp) ### Strata and Condo Pressure Washing Strata & Condo details [Strata and Condo Pressure Washing →](/strata-condo-pressure-washing-toronto/) ![Leaside concrete driveway half cleaned with a hot-water surface cleaner, salt lines on one side](/images/misc/concrete-driveway-in-leaside-toronto-half-cleaned-.webp) ### Driveway Cleaning Driveways details [Driveway Cleaning →](/driveway-cleaning-toronto/) ![Two-storey Toronto home with vinyl siding and brick being soft washed](/images/misc/two-storey-toronto-home-with-white-vinyl-siding-an.webp) ### House Washing House Washing details [House Washing →](/house-washing-toronto/) ![Underground condo parking garage in Toronto being hot-water washed with hydrovac recovery at the sump](/images/misc/empty-underground-condo-parking-garage-level-in-to.webp) ### Parking Garage Cleaning Parking Garage details [Parking Garage Cleaning →](/parking-garage-cleaning-toronto/) ![Night-time hot-water power washing of a Little Italy restaurant rear pad with hydrovac recovery](/images/misc/night-hot-water-power-washing-of-restaurant-rear-p.webp) ### Restaurant Power Washing Restaurant details [Restaurant Power Washing →](/restaurant-power-washing-toronto/) ![Toronto shingle roof under maple canopy, half soft washed to show clean versus black-streaked shingles](/images/misc/asphalt-shingle-roof-of-toronto-home-under-mature-.webp) ### Roof Cleaning Roof Cleaning details [Roof Cleaning →](/roof-cleaning-toronto/) ![Cabbagetown Victorian heritage home with limestone trim being gently soft washed](/images/misc/cabbagetown-toronto-victorian-heritage-home-with-l.webp) ### Soft Washing Soft Washing details [Soft Washing →](/soft-washing-toronto/) How it works ## Your Soft Wash Visit, Step by Step 1. 1 ### Call 24/7 or send photos Tell us the surfaces and stains. Weekend slots are standard. 2. 2 ### Written quote per surface Each surface priced in writing with the rig we will use, before any work. 3. 3 ### Right rig on site Hot water, cold pressure or soft wash, matched to the material. 4. 4 ### Water recovered, photos sent Commercial wash water goes into the hydrovac and a photo report follows. ## Want a Price Before the Next Rain? Send photos or call 24/7. The quote is free and written per surface, so you see the price and the rig before any work starts, with no obligation to book. (647) 277-5411 [tel:+16472775411 →](tel:+16472775411) Get a Written Quote [/contact/ →](/contact/) Why us ## Why York Region Homeowners Trust Our Crews - Zero-pressure roof soft washing for shaded heritage-district roofs - Same-visit interlock clean, polymeric re-sand and seal in Angus Glen and Cathedraltown - Soft wash for vinyl siding in Cornell and Berczy Village - Night washing for Milliken and Highway 7 plazas with hydrovac recovery - Written quote per surface before any work Local knowledge ## Heritage Streets and Planned Communities Markham protects four heritage conservation districts: **Unionville**, **Markham Village**, **Thornhill** and **Buttonville**. Those older streets sit under big silver maples, and shaded shingle roofs there grow moss and Gloeocapsa magma black streaks that pressure would only make worse. Newer planned communities in **Cornell**, **Cathedraltown** and **Angus Glen** have vinyl siding and large interlock driveways. We soft wash the siding and clean, re-sand and seal the interlock in one visit. The City Sewer Use By-law prohibits discharging into storm sewers, so plaza work in **Milliken** and along **Highway 7** happens at night with drain covers and hydrovac recovery. Crews here work from the same hot-water, cold-pressure and soft-wash rigs as every Power Pressure Washing Toronto [/ →](/) job across the GTA, with the same written quote per surface and $2M COI. ![Before and after of a GTA home exterior: salt-stained driveway and green siding versus a clean result](/images/features/before-and-after-split-of-gta-home-exterior-showin.webp) Written quote per surface before any work. Hot-water rigs for grease and road salt. Fully insured, WSIB compliant, COI in 24 hours. ### Getting Around on Schedule The city is spread out, so we route by highway. Unionville, Angus Glen and Cathedraltown sit close to Highway 404 and the 407, while Cornell and Markham Village are reached along Highway 7 and 16th Avenue. Grouping jobs this way keeps travel time off your quote. Roof soft washing [/roof-cleaning-toronto/ →](/roof-cleaning-toronto/) needs dry, calm weather and access around the house, so we confirm the forecast the day before and arrive early to pre-wet gardens. Interlock [/interlocking-stone-cleaning-toronto/ →](/interlocking-stone-cleaning-toronto/) restoration takes most of a day because polymeric sand and sealer need dry conditions, so those jobs get a morning start and a clear weather window. Commercial plazas [/shopping-plaza-power-washing-toronto/ →](/shopping-plaza-power-washing-toronto/) in Milliken and along Highway 7 get night or early-morning washing with drain protection and hydrovac recovery. Weekend residential bookings are standard, and the phone is answered 24/7 for quotes and scheduling. ### Heritage Main Streets and Newer Planned Communities Unionville and Markham Village have older homes on heritage main streets, many under large silver maples and oaks. Those trees keep north slopes of shingle roofs shaded and damp, which is ideal for Gloeocapsa magma black streaks and moss. Pressure would strip granules from those shingles, so we use the SoftWash low-pressure line with sodium hypochlorite and surfactant, then rinse the gutters. Cornell, Cathedraltown, Berczy Village and Angus Glen are newer planned communities. They feature vinyl siding, large interlock driveways [/driveway-cleaning-toronto/ →](/driveway-cleaning-toronto/) , stone front porches and backyard patios. Siding gets a soft wash [/soft-washing-toronto/ →](/soft-washing-toronto/) to kill algae and mildew, and interlock gets a rotary surface clean, fresh polymeric sand and sealer in one visit. Milliken has a dense mix of commercial plazas with busy sidewalks and food tenants, where hot water lifts gum and grease and the hydrovac protects the lot drains. ### York Region Seasons and Your Home Winters here bring regular freeze-thaw cycles that pull polymeric sand from interlock joints and widen gaps for weeds by late spring. Summer humidity under mature trees grows algae on siding and moss on roofs. Many homeowners pair a spring interlock restoration with a fall roof or house soft wash, which keeps both surfaces in good shape through winter. Local case study ## Recent Work in Markham ![Unionville shingle roof under a silver maple during a low-pressure soft wash](/images/features/asphalt-shingle-roof-of-unionville-markham-home-un.webp) Unionville, Markham ### Unionville Roof Soft Wash Rig: SoftWash low-pressure line A Unionville homeowner in Markham had black streaks and moss creeping up the north slope of a fifteen-year-old shingle roof under a large silver maple. We pre-wet the gardens, applied a low-pressure soft wash to kill the algae and moss at the root, rinsed the gutters and downspouts, and explained that the remaining moss would release over the next few rains without any scraping. Roof Cleaning [/roof-cleaning-toronto/ →](/roof-cleaning-toronto/) Markham service area [/service-areas/markham/ →](/service-areas/markham/) Client results ## What Local Clients Say Real jobs, real prices, written quote first. Andrew B. Forest Hill $840 > "Our interlock driveway had lost most of its joint sand after a rough winter and weeds were coming through. They cleaned it, swept in new polymeric sand and sealed it with a natural finish, all on the same day. They explained the cure time clearly and roped it off for us. A year later the joints are still tight and the weeds have not come back. The price matched the written quote to the dollar, and they left the street cleaner than they found it. Our neighbours on the next street have since booked them for their own interlock." Interlock clean + polymeric reseal Hannah C. Hoggs Hollow $685 > "Black streaks and moss on the north side of our roof had been bothering us for years. They did not use any pressure on the shingles, just a low-pressure soft wash, and they wet down all the gardens first. The streaks were gone the same day and the moss let go after a couple of rains, exactly as they said it would. The gutters were rinsed out too, and they left photos of the roof from the ladder so we could see the result up close." Roof soft wash Linda M. Rosedale $425 > "They cleared the salt stains in one visit. Mature maples drop sap every summer, this crew knew exactly which tip to use." Driveway + walkway Service area ## Neighbourhoods We Serve in Markham UnionvilleMarkham VillageCornellBerczy VillageCathedraltownMillikenAngus Glen **Postal codes we cover:** L3P, L3R, L3S, L6B, L6C, L6E, L6G ### Landmarks We Work Near - CF Markville - Pacific Mall - Markham Stouffville Hospital - Main Street Unionville - Toogood Pond Park - Flato Markham Theatre ### Getting Here Highway 404 and Highway 407 serve the west side, and Highway 7 and 16th Avenue lead east to Cornell and the old village. **Highways:** Highway 404, Highway 407, Highway 7, Highway 48 (Markham Road) **Transit:** Unionville GO, Markham GO, Mount Joy GO, Viva Purple Open in Google Maps [https://www.google.com/maps/dir/?api=1&destination=43.8561,-79.337 →](https://www.google.com/maps/dir/?api=1&destination=43.8561,-79.337) Got questions? ## What Markham Homeowners Ask About Pressure Washing ### Do you soft wash roofs in Unionville and Markham Village? Yes. Both are heritage conservation districts with older homes under silver maples, and their shaded north slopes grow moss and black streaks. A low-pressure soft wash kills the growth at the root without stripping granules. Most of these roofs fall between $450 and $850. ### Can you reseal large interlock driveways in Angus Glen? Yes. We clean with a rotary surface cleaner, re-sand with polymeric sand and apply your choice of wet-look or natural sealer in one visit. Full service runs about $3.50-$5.50 per sq ft depending on condition. ### Is high pressure safe on vinyl siding in Cornell? No. High pressure can force water behind vinyl panels, so Cornell and Cathedraltown siding gets a low-pressure soft wash with diluted sodium hypochlorite to kill algae and mildew, then a full rinse. Most 1,500 sqft homes are priced between $350 and $550. ### Do you serve commercial plazas in Milliken? Yes. Plaza sidewalks, entrances and dumpster enclosures along Steeles and Kennedy are washed at night with hot water for gum and grease. Markham's Sewer Use By-law prohibits discharge into storm sewers, so lot drains are covered and runoff goes into the hydrovac. ### How long does an interlock reseal take? Most driveways and patios take a full day: cleaning in the morning, re-sanding once the pavers are dry enough, then sealing. We rope off the area, and you can usually walk on it the next day and drive on it after the sealer cures, typically 24-48 hours. Still have questions? The phone is answered 24/7. Ask about your surface, schedule or COI. (647) 277-5411 [tel:+16472775411 →](tel:+16472775411) Ask in Writing [/contact/ →](/contact/) Nearby service areas ## Also Serving Near Markham ### Richmond Hill Oak Ridges, Mill Pond, Bayview Hill, Richvale and more. Pressure washing in Richmond Hill [Richmond Hill →](/service-areas/richmond-hill/) ### Scarborough Scarborough Bluffs, Guildwood, Agincourt, Malvern and more. Pressure washing in Scarborough [Scarborough →](/service-areas/scarborough/) ### North York Hoggs Hollow, York Mills, Willowdale, Don Mills and more. Pressure washing in North York [North York →](/service-areas/north-york/) ![](/images/hero/power-washing-crew-in-deep-lake-blue-shirts-beside.webp) Phone answered 24/7 · Weekend bookings standard ## Book Pressure Washing in Markham Hot water, cold pressure or soft wash across Unionville, Markham Village, Cornell and every neighbourhood in between. Written quote per surface before any work. Request a Free Written Quote [/contact/ →](/contact/) Call (647) 277-5411 [tel:+16472775411 →](tel:+16472775411) - Written quote per surface - $2M liability + WSIB - COI in 24 hours - Code 681 wash water recovery