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Clarke Basement Systems

Exciting news for our Southern Ontario customers! Clarke Basement Systems is now providing waterproofing, foundations, and crawl space repair solutions under the Groundworks banner.

A smiling man holds a red level and blueprints, standing outside a house on a sunny day.

Our Office Locations

Groundworks – Toronto

12029 McCowan Rd
Stouffville, ON L4A 4C3

1-365-800-6046

Services Offered in Toronto

Groundworks crew installing foundation repair

Foundation Repair

Groundworks is your reliable partner for long-lasting foundation repair services in Alberta. Secure your home now!

two men assessing basement water damage

Basement Waterproofing

Groundworks offers robust basement waterproofing solutions to permanently solve water intrusion and dampness issues.

groundworks installer in encapsulated crawl space next to dehumidifier

Crawl Space Repair

Stabilize your crawl space, keeping it strong for years to come. Groundworks is your go-to expert for crawl space repair.

Production crew installing polyrenewal concrete lifting in front of brick house

Concrete Lifting

Repair your sinking concrete with Groundworks’ PolyRenewal™ concrete lifting technology. Efficient, durable, and eco-friendly.

About Clarke Basement Systems

In 2003, Don Clarke founded Clarke Basement Authority and brought foundation repair solutions to the Toronto area. In 2024, Clarke Basement Authority partnered with Groundworks, the nation’s leading and fastest growing foundation repair and water management solutions provider, to offer industry-leading technology and resources to more customers across Ontario. Clarke Basement Authority continues to provide elite customer service and quality home solutions for all foundation repair, basement waterproofing, and crawlspace repair needs. 

Map of Greater Toronto Service Area

Proudly Serving Southern Ontario

Southern Ontario trusts Groundworks for reliable crawl space, basement waterproofing and foundation repair services. Contact us for a free inspection!  

Why You Should Choose Us

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Had some water infiltration couple of weeks ago after some serious rainfall. I knew my previous owner had used them before and i use them to service my sump pumps.

From the initial quote to the actual work – everything was professional. I am in the construction industry for over 20 years. I can tell you the installers of Dave and Ryan were fantastic. Care for the work.

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We had this backup system in our last house. I would highly recommend as we had 6 years with no issues with water and minimal to no maintenance.
Fantastic business super easy to deal with and professional.

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George brought his wealth of knowledge to the table and educated me on everything about a wet basement. I would recommend him to any one suffering through this predicament. He was able to calm us first time homebuyers and advised us on the best course if action.

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Rob was able to come pretty quickly. We discussed what occurred and Rob was able to identify the probable cause of our flood. So we have a little bit of work to do and Rob will be staying in touch to ensure this solved the problem. Best news I’ve had all week!!!

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Ali completed the annual inspection and service on our sump pump and we are very pleased. He was very pleasant, kept the work area clean from start to finish and was knowledgeable with answering any questions. Thank you Ali!

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Had them in to redo a horrible, installed wrong, ineffective waterproofing system. Thrilled with the workers and the install. They do have a wait period to get the install but you don’t want to hire a company that doesn’t these days! I wish we were able to have tried some of their more high tech solutions but our house is very old so it wasn’t possible. But know they have new very cool options that might work for you!



Joanna Ross