EnerPHit is the Passivhaus Certificate for retrofits. It is not always possible to achieve the true Passivhaus Standard for refurbishments of existing buildings because of the orientation, solar gain and other factors.
The Passivhaus Institute has developed the 'EnerPHit - Quality Approved Energy Retrofit with Passive House Components' Certificate.
This standard can lead to energy savings of between 75 and 90% in existing builldings.
Take a look at our current development 'Carntyne Church' development as a flagship case study of EnerPHit.