How could new-build homes be improved to encourage more renewable energy use?

I beleive It is clearly easier and cheaper to install renewables when houses or flats are being built than adding them later, not to mention the disruption that is involved in retrofitting. Actually it’s just plain common sense. Yet the Government incentivises retrofit whilst ignoring new build.

Should we not be future-proofing our housing stock against the remorselessly rising costs of fossil fuels, delivering housing that is fit for the 21st century? Installing renewables may add a small amount to the initial cost but nobody argues that they don’t pay for themselves over the life of the measure, sometimes many times over, providing significantly lower bills to the occupants.

Developing new renewable resources will require large initial investments to build infrastructure. These investments increase the cost of providing renewable electricity, especially during early years.

And I want to talk about an example : The UK :

To encourage environmentally friendly construction practices there, the Government also introduced The Code for Sustainable Homes which provides guidelines for sustainable building practices. There are six award leves ranging from 10% energy efficient to zero carbon. It will eventually become mandatory that all new buildings will meet Level 6 (zero carbon) of the Code. And actually in October 2010 Building Regulations changed to reflect Level 3 (25% increased energy efficiency) for every new home built.