Hi Kathryn69!
Welcome to AGL Community!
Fees vary according to the work required and the gas network that operates in your area and so we're unable to quote a set fee. Charges are set by your Distributor which are then passed on by AGL.
While your acceptance of any standard fees is required as part of your application, if your Distributor classifies your fee as non-standard, we will get in touch before proceeding. You can visit our website here for more information about changes to your existing meters.
Kind regards,
-Nam-