Enerphit: the Passivhaus retrofit method

An outline of the Passivhaus certified retrofitting process for ensuring an energy efficient home.

By Caroline Rodrigues | 27 October 2020

EnerPHit is the Passivhaus certificate for achieving highly energy-efficient home retrofits. With the help of an EnerPHit retrofit plan, the Passivhaus Institute’s step-by-step approach happens in two or more stages. Architect Tom Raymont from Arboreal Architecture outlines what is involved.

View through v shaped timber beams of an Enerphit retrofitted living room

Eco consultants Ecospheric Enerphit Plus retrofitted this Victorian townhouse.

Experience is key

Start your plans by finding a good architect. You want one with experience of a deep retrofit and preferably an accredited Passivhaus designer. They need expertise in understanding how heat, air and moisture move through a building. Also, an independent assessor, working alongside the Passivhaus-trained architect, is necessary if you want to achieve a Enerphit retrofit. This is more expensive than a deep retrofit to high energy efficiency levels.