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.
Square provided very high levels of quality at a very reasonable price. The equipment was installed with near military precision and before we knew it, we had a state… read more of the art system up and running. They took all the stress away and provided us with excellent levels of service. Our business is protected which gives us peace of mind.
In our industry security is of extreme importance. I am glad we chose square to work with. They are the best choice by far!
alexis martelli
Mark H
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: