When Mark Kostiw founded Square Security Inc. over a decade ago, the goal was straightforward: provide Toronto businesses with high-quality security solutions delivered through a streamlined, efficient installation process. Today, Square supports commercial clients across Ontario with customized system designs tailored to their operational needs, installed by a seasoned and highly skilled team.
Mark Kostiw came out and installed our card access system. He did a great job, very organized and the job was completed beyond our expectations. Would highly recommend Square Security
Square is incredibly responsive and always get us exactly what we need.
Mark, and his TEAM are knowledgeable, listen and understand what your needs are. They were on time, finished the job on schedule and went the extra mile to ensure that… read more 
We design and install security systems for organizations of every size—from small local businesses to complex, multi-site enterprise deployments for some of Canada’s largest companies.
We serve Toronto and Southern Ontario, including:
