The Secretary of State maintains the register of commissioned notaries and must be able to reach each of them, so any change in the address of record has to be reported. California requires written notice within 30 days of a change in either the business or the residence address, and the notice must be given by a method that produces evidence of delivery — certified mail or an equivalent means of physical delivery providing a receipt, or electronically where that channel is provided. Failure to give the notice carries a monetary penalty. What the change does not require is a new oath and bond, a new seal, or any county filing, because those attach to the commission and the county of principal place of business rather than to where the notary lives. The one situation that does trigger a county filing is a change in the county of principal place of business, which is a different event from moving house.