Cheers for the replies. The house is actually in Edinburgh, and it's just for the external walls (all rendered). Folk in my office have talked about it costing several thousands to get houses done, though that includes tons of paint.
I was trying to get an idea if it would be much cheaper to do it myself (including buying all the paint at B&Q prices) or getting someone proper in to do it who gets discount paint, but obviously I need to pay their labour costs.
I know it's almost always cheaper to do things yourself, but somethings aren't worth the hassle. I want to know if this is one.