Ideally you want a concrete floor, but we mustn't forget power either! You will need it for the big tv in the corner, the beer fridge and drill recharger's etc etc.

Oh you will also need a sink (experience tells me that mums and GF's dont like when you bring dirt into their laundry!) with running water, a toilet and a couch or some comfy chairs.

Oh and definitely dont forget the girly calender! If your going to spend time in their, you might as well enjoy it even more