It’s entirely up to you. For peace of mind, we suggest you do so. You can never be sure who a previous homeowner has handed spare keys out to. Over the years decorators, cleaners and handymen may have needed access and could still be in possession of a key. Remove the risk by having all your external locks changed. We recommended contacting a locksmith 2 weeks before your move to ensure they are available. Ask them to meet you there on removals day so they can sort out your locks straight away.