The Passive House Planning Package (PHPP) has long been the standard tool for design and certification of Passive Houses. At the core of the package are worksheets for heating and cooling energy balances, heat distribution and supply, electricity demand, and primary energy demand.
Within 3ENCULT, the PHPP has been supplemented with useful features for energy retrofit of historic buildings. This includes:
•    Parallel calculation of the pre-intervention status as well as subsequent refurbishment steps in one PHPP file
•    Parallel calculation of different variants of the same energy retrofit measures (e.g. different glazing qualities)
•    Comparison of these variants regarding energy savings, minimal interior surface temperatures, and financial net profit (life-cycle calculation)
•    Verification of compliance with PHI’s EnerPHit standard for energy retrofit of historic and other buildings
•    Database of typical construction elements of old buildings

EnerPHit verification has already been included in the current official PHPP release. The other new features will be added with PHPP 9, to be released in the second quarter of 2014. Please refer to http://passiv.de/en/04_phpp/04_phpp.htm for more information.
3ENCULT is now developing a set of recommendations on ways to integrate energy efficiency retrofits of historic buildings into local sustainability processes and strategies. Local Governments across Europe are invited to take part in the discussion on overcoming barriers to implementation, and exploring solutions for the advancement of this sustainability target through an inclusive process of consultation.