Sub-master keys
Locks and keys have been used for centuries to safeguard valuable assets and property against unauthorised access and they continue to be used for the same purpose. From the oldest...
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Security for Businesses
Calder Security is Yorkshire’s leading independent security company, offering a range of security services for homes and businesses.
We are a growing, company offering friendly, personal service with capability across a diverse range of security solutions. All our engineers are employed directly which means that we can guarantee their professionalism, knowledge and experience and that they meet our high expectations in terms of the service they give you.
Our Latest Posts
3rd May 22
Master keys (MK)
Master keys are a fascinating concept that many people often don’t fully understand. How can one key open two doors? Also, how is another key that is opening one of...
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3rd May 22
Great Grand Master Keys (GGMK)
Although an increasing number of property owners are switching to electronic access control systems, many still rely on traditional keys to control and manage access. Albeit so small, keys play...
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We provide National Contracts
While we are a Yorkshire based company, predominantly covering the Yorkshire region, we have the resources and capability to manage national contracts for multi-site companies.