Hi , as a fellow Kiwi, you have a fair choice of sheds available here in NZ, there are Skyline and Versitile, they do more than just garages, then there are outfits like Goldpine, and they do other than hay sheds, infact if you get one of the latter at the moment you'll go in the draw to win a Gator (to the uninitiated, a small 4 wheeled farm vehicle), They have 2 sheds in the latest flyer, the Angus Barn, it has 3 bays, so it has a floor area of 12 M x 8 M, and 3 M height. Or the Jersy Lifestile Barn, its 9 M x 9 M X 5.2 M high, and a 4.5 X 9 leanto down one side, They have a 22% discount at the moment. I imagine these Colour Steel clad sheds are unlined.
My shed is a double Skyline garage with a single front door(originally 6 M x M), I extended it 3 M.
Ian S C