So DH and I have finally, after months of looking, found a house we want to buy. right schools catchment, right price, big enough etc.
The EA has listed as 2 beds, but on viewing it is clearly a 3+ bedroom house. Apparently this is because it has planning permission for 2 beds, and the other rooms have to be called something else although they can exist 
Does it even matter?
does it affect how council tax is calculated?
if we use upstairs room 3 as a 3rd bedroom, what are the implications?
do we really need to get the PP changed to reflect it in reality?
Is that likely to be difficult? Costly?
what if it got turned down?
anyone?
Thanks in advance.