It is for people on benefits
If they are of working age and have extra bedrooms in their home, they have to pay for each spare room and they do not get help for them in a rent rebate
It is basically taxing people who do not have income, for having space in their home. It has caused a lot of problem for people already having problems
If you were having to get housing benefit then yes, you would have to pay for those rooms
The amount of rent you can claim housing benefit for is reduced by:
14% if you have one 'spare' bedroom
25% if you have two or more 'spare' bedrooms