General Outdoor Contracting & Build Landscapes in Toronto and Central Ontario

Partners & Associates

Over the years, we have been fortunate to have taken part in and developed strategic partnerships which add value to our daily business operations and ultimately passed on to our customers.

As part of that commitment, we have also taken an active role in supporting the development and professionalism within the industry through participation with Landscape Ontario Horticultural Trades Association (LOHTA).

We are also proud members of the Canadian Green Building association (CGBA) and Technical Safety Standards Association (TSSA).

Cornerstone is also actively involved with many local communities by supporting major events, festivals and various charities throughout the year.


The CaGBC is responsible for all LEEDS initiatives in Canada. The following is taken directly from their website. Our mission guides our work: Lead and accelerate the transformation to high-performing, healthy green buildings, homes and communities throughout Canada. Our Vision. A transformed built environment leading to a sustainable future.

Landscape Ontario

We have been members of Landscape Ontario for over 20 years. Started in 1973, Landscape Ontario Horticultural Trades Association (LOHTA) is a vibrant association representing over 2000 horticultural professionals. Our members include landscape, maintenance and snow management contractors, landscape designers, lawn care operators, garden centre owners, arborists, nursery growers, interior landscapers, and irrigation and landscape lighting contractors.


Contractor Check

Every organization has a legal responsibility to ensure that contractors working on their premises operate in a safe manner. ContractorCheck is operated by RiskCheck Inc. – one of Canada’s leading Environmental, Health & Safety risk management companies. ContractorCheck assesses the Health & Safety policies and procedures of contractors to ensure they are meeting legislative standards and industry best practices.

Health & Safety

AMBITIONS 2020 Ensuring the protection of our employees’ health and safety is our first priority. This is the guiding principle for all employees of the Group, starting from the highest levels of responsibility.