The Passivhaus Standard is a construction standard developed by the Passivhaus Institute in Germany (http://www.passiv.de). The standard can be met using a variety of design strategies, construction methods and technologies and is applicable to any building type.
The EnerPHit Standard
It is difficult to meet the requirements of Passivhaus for a new build but when retrofitting an existing property this is even more difficult as the orientation and many fabric components have already been provided, with many areas being difficult to retrospectively make cold bridge free. Though it is possible in many circumstances it is not financially viable, for this reason a retro fit standard for existing homes is being developed, the EnerPHit