Ken Grayling
Hi, Susan, the answer will depend to some extent on what locks you have front and back at the moment. Some locks have a cylinder that can be replaced, others (lever mortice) require the entire case to be replaced. Do your insurers offer a discount if you fit locks to BS 3621? - known as 'insurance standard'. These are more expensive and also more secure.. It is a good idea to have the same key for both doors, keying alike takes a little longer and costs a little more. Your windows should also be lockable.
