Hi Simone
Sounds like all residential ratepayers are affected by the name change? I’d do the letters for a few reasons: 1) compliance , 2) fresh direct engagement with your ratepayers about their categorisation, and 3) good PR – you don’t want 100’s of calls after the fact when you could have addressed and explained the change upfront. Your letter could be both a declaration and an explanation of change (you might even get some ratepayers coming forward as a result of the letter saying their category isn’t right and then you can investigate – so good house-keeping).
If it it means 1000’s of letters maybe your mailhouse could get them out for you – I guess the postage $ will hurt, but I reckon you need to do it and moreso if you regularly get ratepayers challenging whether they are in Residential ordinary or the sub category.
Cherie