Knowing the type of door locks are fitted to our property is very important.  It could be a matter for the insurance company if anything untoward happens that requires their input.    Well before that point in fact the type and design utilised on external and the front door will be needed if using the home insurance comparison sites.  Needing help in identifying whether there are deadlatch, mortice deadlock or multi-point locking systems there are web sites and companies who will expertly guide you through what each type is.  The locksmith association in the UK recommend changing the lock on front and other exterior doors every seven years.  This is not only a sales matter, locks do wear out and become unstable,unreliable and more easily forced open in any breakin. .  .   Wear and tear on locks also causes a problem when they stop working.  It will be sudden and you come home after a  hectic day and boom. . .  your key doesn’t open the door.  Getting a door lock company to check them out is well worth the small expenditure.