Proudly Serving Greater Toronto including - Mississauga, Markham, Vaughan & nearby

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Products & Services

Mold Services
Dust Mites Control
Mold Spores
Mold Prevention
Dry Rot & Brown Rot

Basement Repair Services & Products
WaterGuard Interior System
DryTrak Drainage Channel
TrenchDrain Drain Grate
IceGuard Discharge Line
FlexiSpan Wall Crack Repair
Polyurethane Crack Sealing
WellDuct Window Drainage
BrightWall Waterproof Panels
ThermalDry Wall Barrier
Basement to Beautiful Pre-Finishing Wall Insulation Panels
Drain Tile Installation
SuperSump Pump System
TripleSafe Pumping System
UltraSump Battery Back Up
SaniDry Dehumidifier

Crawl Space Repair Services & Products
CleanSpace Encapsulation Vapour Barriers and Liners
Turtl Access Hatch
EverLast Crawl Space Doors
SaniDry CSB Dehumidifier
SmartDrain Water Drainage
SilverGlo Wall Insulation
TerraBlock Floor Insulation
SmartSump Sump Pump
WallCap Block Wall Sealer
SmartVent Flood Vents

Foundation Repair Services & Products
Push Pier Underpinning for Settlement, Foundation Leveling, Sinking Foundation Repair
Structural Repair
Geo-Lock Wall Anchors
Geo-Lock Helical Anchors
PowerBrace Bowed Wall Repair
CarbonArmor Fiber Wall Repair
SmartJack Crawl Space Support
Slab Pier Repair
ShotCrete Wall Restoration

Concrete Repair
PolyLevel Concrete Lifting & Leveling
NexusPro Cracked Concrete Repair
SealantPro Concrete Sealant
Interior Slab Repair
Concrete Sidewalk Repair
Concrete Pool Deck Repair
Concrete Driveway Repair

Before and After Pictures from Unionville
Waterproofing and Stabilizing in Unionville, ON

Waterproofing and Stabilizing in Unionville, ON

Before After
Waterproofing and Stabilizing in Unionville, ON Waterproofing and Stabilizing in Unionville, ON

A home in Unionville, Ontario, had a problem located in the cold cellar beneath the front porch. Water was seeping in through a crack in the front porch slab, and the slab was not stable. This was a problem because the house smelled very musty due to the leakage, and nobody could stand on the front porch because it was unstable. The home was a daycare facility and children are coming in and out of it every weekday. The health and safety of the children was at stake.

The owner contacted Clarke Basement Systems for a solution. Jose Martinez and the crew came in and installed CleanSpace® wall membrane on the walls to capture any water and moisture. They established a WaterGuard® to collect any water seepage and push it away from the home, and SmartJacks™ were used to make the repairs and stabilize the porch slab. 

Water Seepage in Cold Room in Unionville, ON

Water Seepage in Cold Room in Unionville, ON

Before After
Water Seepage in Cold Room in Unionville,  ON Water Seepage in Cold Room in Unionville,  ON

Homeowners in Unionville, ON, were having water seepage issues in their cold room. Water was leaking from the walls and ceiling. System Design Specialist, Ron Monk, concluded that our patented Crawlspace Encapsulation System would be the exact solution to permanently waterproof their cold room. By using CleanSpace®WaterGuard® and a SmartSump®, we were able to fix their cold room for good! Now, the homeowners no longer have to worry about any future water entering their cold room.

Eliminating Water Seepage in Markham, ON

Eliminating Water Seepage in Markham, ON

Before After
Eliminating Water Seepage in Markham, ON Eliminating Water Seepage in Markham, ON

Our customer had water seeping in through one side of their finished basement. The water had started to damage the carpet and baseboards. We installed WaterGuard® Sub-Floor Drain with a SuperSump® Premier Sump Pump System. An IceGuard® Discharge Line System was added to collect water from the ThermalDry® Wall Membrane and discharges the water into the sump pump system. A WellDuct® Window Well Drain was also installed to remove water from the window well and drain it into the WaterGuard® system.

Company Awards
Best of 2019 Homestars Award
Hailed as HomeStars' highest honour, the Best of Awards, presented by DEWALT, Canadian Contractor and RenoRun, recognizes the most trusted... [Read more]
HomeStars Best of 2016 Award
Clarke Basement Systems has been awarded the HomeStars Best of 2016 award which we are very proud of.... [Read more]
More Awards

Trusted Concrete Leveling & Foundation Repair Contractor in Unionville, ON

I would recommend Clark Basement Systems to anyone who requires work to be done in their basement....
Happy Customers Surrounding Unionville, ON
Work Requests

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Reviews From Unionville
Testimonials From Unionville
I will recommend Clarke Basement Systems to all my friends
Testimonial by C. F. from Unionville, ON

Basement Waterproofing Experts Serving Unionville, ON

Water in the basement or crawl space leads to mold, rot, musty odors and structural issues. It also leads to a reoccurring headache for you. Luckily, Clarke Basement Systems has a team of trained experts that are available to permanently fix the problem.

We will properly install a hidden drainage system in your Unionville basement and completely encapsulate your crawl space with CleanSpace vapor barrier. We are here to solve the problem for you.

Why Choose Us?
  • Lifetime Warranty on all Perimeter Waterproofing Systems
  • 25-year Warranty on Crawl Space Encapsulation Systems
  • Sump Pump Installation, Repair & Replacement
  • Basement, Crawl Space & Spray Foam Insulation
  • Crawl Space & Basement Dehumidifiers
  • Hundreds of Satisfied Customers

Foundation Crack Repair Contractor

Foundation repair problems destroy your Unionville home’s value and can be dangerous. Our in-house team of structural and geo-technical engineers are here to help. We design and install the right solution and usually have the project finished in less than a week. You will have peace of mind as we provide a 25-year written warranty against defects on our foundation products.

We Fix
  • Bowing Walls
  • Sagging Floors
  • Stair-Step Cracks
  • Tilting Chimneys  
  • Foundation Cracks
  • Garage Slabs   
We Use
  • Wall Anchors
  • Slab Piers
  • I-Beam Wall Braces
  • Helical Deck Piers
  • Underpinning


Crawl Space Vapor Barrier Encapsulation Experts

Crawl space encapsulation is the best way to eliminate musty odors, mold, moisture and mildew. Clarke Basement Systems has a team of dedicated crawl space encapsulation experts with decades of experience and warrantied products. Our patented crawl space vapor barriers provide a dependable moisture barrier that is guaranteed to last 25 years. Trust our crawl space encapsulation team to permanently fix your leaky or damp crawl space. Our crawl space encapsulation services are proven, dependable and warrantied. Call or click today to schedule your FREE crawl space encapsulation estimate!

Benefits of our Crawl Space Vapor Barriers:

  • Seal Out Cold Air, Humid Air & Moisture
  • Prevent Crawl Space Leaks
  • Improve Energy Efficiency
  • Durable Crawl Space Vapor Barrier Material with 25-year Warranty

Fast & Affordable Concrete Repair

The sunken and cracked concrete around your Unionville home is both an eyesore and a safety hazard. It is also likely to get worse with time, but we can fix it for you!

Our experts use PolyLevel, a superior polyurethane foam to provide reliable concrete lifting & leveling solutions. Small holes are drilled in the concrete and the expansion of the foam lifts & levels the concrete. The majority of contractors you will call use mudjacking instead of foam. Mudjacking is heavier, requires larger holes in the concrete and does not last as long as PolyLevel.

If your home has cracked concrete steps, pool decks, patios, or other slabs, then NexusPro is the right solution. NexusPro repairs concrete cracks and joints and is ultra-durable, so it will withstand UV rays, extreme weather, and more.

After utilizing our expert concrete repair solutions, consider the powerful concrete sealant, SealantPro. SealantPro further protects your concrete by bonding with it to guard against oil, gasoline, liquids, and other debris. In just one coat, SealantPro extends the life of your concrete by 3 to 5 times overall. 

Call us today to learn more about our proven concrete leveling, cracked concrete repair, and concrete sealing techniques.

We Fix
  • Cracked Driveways
  • Uneven Patios
  • Sinking Sidewalks      

  • Uneven Concrete
  • Sunken Pool Decks
  • Highway & Commercial Issues
  • Changes saved.
Case Studies From Unionville
Homeowners in Unionville, ON had a cold room which was leaking from the ceiling and walls. The cold room was initially used for storage, but due to...
Homeowners in Markham, ON had just moved into their new home a few months ago. They were planning on renovating their basement until they discovered...
A home in Markham, Ontario, had water coming out of electrical panel into the basement. Not only was the basement floor getting wet, but water...
Job Stories From Unionville, ON
Crawlspace Encapsulation System in Unionville, ON

Homeowners in Unionville, ON, were having water seepage issues in their cold room. Water was leaking from the walls and the ceiling, where they kept their storage.

They had to move the storage to the basement, which was a considerable inconvenience and continuously got in their way. They knew that to reclaim their cold room, they needed to fix their water leaking issues!

They contacted Clarke Basement Systems and set up a free inspection with System Design Specialist, Ron Monk.

Ron Monk inspected the house and concluded that we would need to install our patented Crawlspace Encapsulation System which included a SmartSump®WaterGuard® and CleanSpace®.

Once Ron had come up with the perfect solution, the homeowners were ecstatic to move forward with the process. Soon after, Installation Foreman, Jose Martinez and his team attended the home to install our patented products.

Jose Martinez had removed all shelves, wall and ceiling materials in the cold room to gain access to the concrete walls. Then they installed our WaterGuard® drainage system, which connected to our SmartSump®, as well as our CleanSpace® Wall Membrane System.

Once the work was complete, the homeowners were relieved to be able to use the cold room again. They could now store their belongings and not have to worry about any future water seepage issues. 

Crawlspace Encapsulation System in Unionville, ON - Photo 1Crawlspace Encapsulation System in Unionville, ON - Photo 2Crawlspace Encapsulation System in Unionville, ON - Photo 3Crawlspace Encapsulation System in Unionville, ON - Photo 4Crawlspace Encapsulation System in Unionville, ON - Photo 5Crawlspace Encapsulation System in Unionville, ON - Photo 6
Stop Water Seepage in Aurora, ON

Mark B. and his family recently moved into their new home in Aurora, ON. Once they got settled in and they were excited to start renovating, Mark noticed that the basement was damp. To him, this was going to be a HUGE issue, as he wanted to renovate his new home's basement as soon as possible to create more living space. In his previous home in Unionville, ON, he had similar issues with water seepage. Clarke Basement Systems fixed those issues, so he knew he had to call us again.


Our System Design Specialist, Chris Luke fixed his home's water seepage issues in Unionville and was called again to diagnose the issue at his new home in Aurora. After inspection, Chris noticed that the area of concern was the back wall. Water was seeping through the foundation walls and pooling on the basement floor. Chris put together a plan that would not only fix the issue, but also give Mark the peace of mind of knowing that he could renovate his basement without damaging any new additions. The plan consisted of a ThermalDry™ Wall membrane that would drain all the wall's water into our patented Waterguard® trench system. All the water would then flow from the Waterguard® trench perimeter and into our patented SuperSump® Sump Pump. This sump system would then pump all the water out of the basement and away from the house, leaving it dry. The ThermalDry™ Wall Membrane not only funnels the water to the Waterguard® system, but it also improves comfort and energy efficiency by reflecting heat back into the basement.

 There's no doubt that Mark and his family can now enjoy a dry, healthy basement and begin their renovations. 

Stop Water Seepage in Aurora, ON - Photo 1
Damaged Concrete in Unionville, ON

Our customer had removed a large tree from their property causing their concrete walkway to settle. The roots of the tree had been pulled out creating large voids under the concrete weakening the soil and allowing for settlement to occur. Our customer was concerned that the sloping pavement could pose a severe trip hazard and would cause water to pool at the foundation of the home.


A meeting was set up with Project Lead, John DiNicolantonio. He proposed to inject Polyurethane. Our polyurethane is injected beneath the settled concrete and compresses the loose soils, lifting the slab. Foreman Kyle began by drilling dime-sized holes through the concrete and then inserting the Polyurethane.


We offer an affordable alternative to fix sunken and settled concrete without the need of replacing or ripping it out. Our customer is pleased we were able to correct the slope of the walkway and remove all of the trip hazards. 

Waterproofing and Stabilizing in Unionville, ON

A home in Unionville, Ontario, that is a daycare facility had a problem located in the cold cellar beneath the front porch. There was water seeping in through a crack in the front porch slab and it was very unstable. This was a problem because the house smelled very musty due to the water seepage and nobody could stand on the front porch because it was unstable. This was a risk for the children that were coming in and out of the home every weekday.  

The owner called Clarke Basement Systems to fix the problems. Jose Martinez and the crew came in and installed Cleanspace wall membrane on the walls to capture any water and moisture. They installed a WaterGuard to collect any water seepage and push it away from the home and SmartJacks were used to make the repairs and stabilize the porch slab. 

Work Requests From Unionville, ON
Vicinity of Emmeloord Cr in Unionville
During heavy rains water comes in to the basement laundry room
Vicinity of Callahan Rd in Unionville
We have a drainage problem along the side and back of our home.
Vicinity of Ritter Crescent in Unionville
Looking for a window well solution for one or more windows. Currently have steel window wells. Top of basement windows is ca. 7 inches above grade. Windows are fine, replaced 2014, but I am looking for a better solution than the MacCourt product sold at Lowes, Home Depot and Rona.
Vicinity of Longwater in Unionville
We have water damage in the back corner of our basement. We had the foundation repaired a couple of years ago...and now there seems to be water in the same spot. Looking to find the source of the water (once and for all) and to resolve the issue
Vicinity of Foxmeadow Lane in Unionville
Patterned concrete sinking by front steps. This issue is getting progressively worse over the last few years. This year visitors have trouble stepping on the front stairs leading up to the front door. Need it assessed. Thank you Craig & Marsha Winsor
Vicinity of Carlton Road in Unionville
Mould built up at foundation joint. Damp basement. Suspect high water table
Vicinity of Main Street in Unionville
We are a business in Unionville and we have a leak in our basement. Could we please have someone come out and look at it. Thank you. Enid
Vicinity of Stanford Rd. in Unionville
I'd like to get an estimate to repair a leaky basement room and cold room. Please give me a call on my cell phone.
Vicinity of Pinebrook Hollow in Unionville
I have water seepage into my furnace room in the basement. I suspect an external repair is needed as I dug outside and found wet clay all around the affected wall area.
Vicinity of Aitken Cir in Unionville
I would like to get a quote to repair some cracks in the exterior foundation. You did work for me a couple of years ago and I was very satisfied. Thanks
Vicinity of Hemingway Crescent in Unionville
We have effloressence coming through the cinder block wall in the basement (which is unfinished). Need someone to assess if there is water leakage and what the fix is and cost.
Vicinity of Station Lane in Unionville
Need backup sump pump system that lasts the longest
Vicinity of Dalecroft Circle in Unionville
Hi - I'm looking for a window to be installed in the basement that will allow a 2nd fire exit as there is a basement bedroom. I just bought the house and it was like this but I can't use it as a fire escape. Do you have such a thing and are able to install? Please advise if you can give a free estimate? Thanks!
Vicinity of Holbrook Court in Unionville
We have water leaking into the basement in an unfinished section of the basement. we also had a recent separate incident in a window well where water did not drain properly and leaked into the basement in another unfinished room.
Vicinity of Aitken Circle in Unionville
Damp/Water leaking into cold cellar
Vicinity of Millstone Court in Unionville
I have a wet smell in the basement and wondered if you have a tool that determines if its from water/mould. thanks you can also call me at
Vicinity of LibraryLane in Unionville
We have just had our second basement flood in two weeks after 20 years with out a problem. The water is coming in a window in a window well. The Restoration people thought it was a window well drainage problem w but based on what I saw tonight it appears to be different and it will take to long to type.
Serving the following Unionville, ON postal codes
L3P 1W9, L3P 3J3, L3P 3M2, L3P 4H1, L3P 5E4, L3P 5E5, L3P 6V2, L3P 6V3, L3P 6V4, L3P 7B5, L3P 7B6, L3P 7B7, L3P 7B8, L3P 7B9, L3P 7C1, L3P 7C2, L3P 7C3, L3P 7C4, L3P 7C5, L3P 7C6, L3P 7C7, L3P 7C8, L3P 7C9, L3P 7E1, L3P 7E2, L3P 7E3, L3P 7E4, L3P 7E5, L3P 7E6, L3P 7E7, L3P 7E8, L3P 7E9, L3P 7G1, L3P 7G2, L3P 7G3, L3P 7G4, L3P 7G5, L3P 7G6, L3P 7G7, L3P 7G8, L3P 7G9, L3P 7H1, L3P 7H2, L3P 7H3, L3P 7H4, L3P 7H5, L3P 7H6, L3P 7H7, L3P 7H8, L3P 7H9, L3P 7J1, L3P 7J2, L3P 7J3, L3P 7J4, L3P 7J5, L3P 7J6, L3P 7J7, L3P 7J8, L3P 7J9, L3P 7K1, L3P 7K2, L3P 7K3, L3P 7K4, L3P 7K5, L3P 7K6, L3P 7K7, L3P 7K8, L3P 7K9, L3P 7L1, L3P 7L2, L3P 7L3, L3P 7L4, L3P 7L5, L3P 7L6, L3P 7L7, L3P 7L8, L3P 7L9, L3P 7M1, L3P 7M2, L3P 7M3, L3P 7M4, L3P 7M5, L3P 7P4, L3P 7P5, L3P 7R6, L3P 7R7, L3P 7R9, L3P 7S1, L3P 7S2, L3P 7S3, L3P 7S4, L3P 7S5, L3P 7S6, L3P 7S7, L3P 7S8, L3P 7S9, L3P 7T1, L3P 7T2, L3P 7T3, L3P 7T8, L3P 7V7, L3P 7V8, L3P 7W1, L3P 7X9, L3P 7Z2, L3P 7Z3, L3P 8E1, L3R 0A4, L3R 0A5, L3R 0B5, L3R 0C6, L3R 0G1, L3R 0G2, L3R 0K6

our service area

Clarke Basement Systems service area