Do you need to add an extra room without renovating, or a little temporary home for the bach site?  Based in Auckland, NZ, Mobile Habitats have a full range of portable accommodation solutions, with some offering kitchen and bathroom facilities.  Because they are portable, you do not need a permit, with prices starting at about $10k to purchase. Or if you only need a temporary space solution, they even rent them starting at NZ$58 per week. Go take a look at their website for more info…they come in cool colours and are super mod looking.