How to protect your work place ?

I started a branch of my office in Edmonton. After beginning the office, one of the things that bothered me was the safety of the premises. Since there were many expensive equipment and documents in the office, it makes me feel nervous while I'm away from my office. So I started searching for some reputable security service providers in Edmonton. I did an online search and found a company with high ratings and good reviews. Finally, I took the details and contacted them. When I told them about the situation, they were very helpful in appointing security guards at my office premises. It's a month since they selected the security guards. I was feeling satisfied as I can leave the office confidently with a peace of mind at any time now. Does anyone know how much does a security service provider charges typically for appointing security guards in the workplace?