I've spent 2012 getting this built, a 70m2 side extension to my house in the UK. I've made it as green as I can afford- from aircrete blocks and 100mm glassfibre cavity insulation (the blocks are apparently made from power station ash and the insulation from old bottles).
It's partly passive solar; with a concrete ground floor slab heated by a large 6m2 south-facing door. Naturally it will be instrumented!
Looking forward to getting data on energy use when we move into it in early 2013.
