Inhabitat website has a feature about the Wheel Pad. The 200 sq ft (18.5 sqm) residence is designed to be an add-on to an existing home. It comes on a trailer and stays on the wheels. This means it can be taken away again if the “house” isn’t needed any more. The original idea arose out of a need to incorporate someone after an accident and needed a wheelchair for getting around.
The explanatory video on this website is almost ten minutes long, but well worth the watch. It covers the design process, the features, and finally two wheelchair users who visit and give their feedback about the design. This idea could be adapted in Australia as long as the existing home has a yard big enough to take it. They claim it can be built in a day. A must see for anyone involved in providing home modifications. Also suited to bringing a parent close to home.
Editor’s note: I found the trial by the two wheelchair users at the end very informative. The ramp was a bit steep and long so they used the wooden rails to pull themselves up (splinters were mentioned). One had difficulty coming over the threshold. They discussed what worked and what might not and how things could be changed to suit.