Does anyone have any experience in developing zero energy developments? How much more expensive are they than conventional buildings and are renters/buyers willing to pay a premium for it? I work with renewable energy a little bit and see an increasing appetite for this, so I wouldn't be surprised if it was starting to become financially viable (not to mention it being the right thing to do.
Nightingale are developing eco apartment buildings. There are a few news stories about their projects in the press, and quite a bit of demand. I think that there are a few others, but they're lower profile. In the UK, ZEDFactory have done a few projects. BedZED was one of the first, and I think was largely lower cost housing. Josh's House was a one-off build in Perth. I think that it's a lower cost project. I believe that it can be done relatively cheaply, but it depends what level you're targeting. Something like a Passivhaus (International or Australia) will cost more.
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