What you can build in your back yard

What can you build at low cost without requiring council consents?
Bill McKay, Senior Lecturer in the School of Architecture and Planning at the University of Auckland, discusses the possibilities of small backyard dwellings.
Well worth listen:
http://www.radionz.co.nz/national/programmes/ninetonoon/audio/2018650782/tiny-houses-what-you-can-build-in-your-backyard