Currently, Part Q is only applied to new dwellings, so if you are building a new home or converting a non-dwelling (e.g. a barn) into a home then it is a required. If you are renovating a home then it is not a requirement. However, we would certainly recommend that you look for a manufacturer who builds security as standard, like we do. Look for espagnolette locking and 3* high-security cylinders (neighbourhood watch approved) where possible.