Start by identifying your security requirements. Consider factors like the size of your premises, type of assets to protect, and the level of threat your business faces. Credentials and Licensing: Ensure the security companies is licensed and meets all legal requirements, and if you are looking security guards in UK then always check the guard they provided is approved from SIA. Research the company's reputation and track record. Look for customer reviews and ask for references, security guard companies evaluate the company's use of technology, like surveillance systems and communication tools.