I'm not sure what the rules are in general about setting up such a thing in your house, but rates would probably be the least of your worries. Insurance for that sort of thing will probably be astronomical.
I think the rules are that you are allowed to use a room for business and not pay rates as long as the room is not used solely for the business. So just stick a computer in the corner and say it is your computer room as well. Insurance would need to be through one of the beauty insurers. I don't think you would have that much trouble securing insurance.