Your conveyancer will let your lifetime ISA provider know the purchase went through and you’re now a homeowner. Your provider will mark the process as complete on their system and notify HMRC.
Even though you’ve used your lifetime ISA to buy your first home, your account isn’t closed, despite it now being empty. You can keep putting money into it until the age of 50 to save up for your retirement – and you’ll still get that 25% government bonus on everything you put in.