Passivhaus is a fast growing energy efficiency standard with 30,000 properties realised to date. Passivhaus is based on a few simple principles – (1) to build houses which have excellent thermal perfo

Greenwatt Way, in Slough, Berkshire, is more than a zero carbon Code for Sustainable Homes Level 6 development. It’s a live testbed for, amongst other things, five different types of energy generati