convertion

I have purchased a house from an Estate. The previous owner has part converted the loft - there is dormer conversion with a bedroom, shower room, and separate landing, however it is only accessible via pull down stairs. I would like to have proper stairs fitted, but not sure where to start...

Hello. Would really appreciate some advise. Could we convert our garage to a bedroom on our coach. I have attached a photo. We own the garage on the left next to the front door. Thanks in advance.