Here's everything you need to know and a list of prefab cottages you can buy for under $100K, if you're thinking of greener ...

From prefab tiny houses and modular cabin kits to entire homes ready to ship ... on Passive House design principles and prefab buildings while responding to the wildly varying Australian landscape.

she sheds are constructed outdoors, either close or connected to the house or farther into the backyard. They can be prefabricated or custom-built. Some homeowners even build them themselves.