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.
























Square Security installed a card access system for our office, covering both the perimeter doors and the server room. The entire project was completed to a high standard, on time,… read more and within budget. Mark and his team were professional, efficient, and easy to work with from start to finish. The software is intuitive and user-friendly, and I appreciated the time they took to walk me through how everything works. I would highly recommend them for any security installation needs.
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 the work was done correctly and ecstatically looked GREAT!
Mark spent time and trained us with patient while we learned the software.
Our company will be using Square Security for all our security needs and would highly recommend them.
Professional ALL THE WAY!!!
alexis martelli
Jacqueline Dawes
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: