Chubb was a manufacturer of locks. The Chubb brand has recently been incorporated with Yale locks and Union locks as they are all owned by the same company, Assa Abloy. Chubb made rim locks, deadlocks, window locks and other secondary security products like key operated locks, door chains etc. People often call a mortice deadlock a Chubb lock. A mortice deadlock is a lock which is morticed, cut into, the edge of the door and is operated by a key from both sides. When you turn the key to lock the lock a deadbolt is thrown and engages in the strike plate which is fitted to the door frame. Once the bolt has been thrown it can not be pushed back into the lock with your finger unlike a latch.
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Chubb is a brand of lock and there are several different types of Chubb locks and it depends on which Chubb lock you have to how much it costs to change. Everyone refers to their deadlock as a Chubb lock but there are several manufacturers with each manufacturer making several types of lock and it depends on what lock you have currently in your door to what lock you can change it to which will then effect the price. So there is no definite answer to how much it would cost to change a Chubb lock.