Passivhaus is the world’s only international certified energy based construction standard available today.

This standard, which was started in Germany by Dr Wolfgang Feist, is a holistic low energy design concept. Its primary aim is to reduce space heating demand and the primary energy consumption of the building. In a Passivhaus, thermal comfort is achieved using predominantly passive measures, as listed below. The standard can be applied to any building type from residential to commercial, industrial and public buildings.

Passivhaus Features

  • good levels of insulation with minimal thermal bridges
  • passive solar gains and internal heat sources
  • excellent level of airtightness
  • good indoor air quality, provided by a whole house mechanical ventilation system with highly efficient heat recovery

Latest Passivhaus and Low Energy Projects

Passivhaus Benefits

Huge energy savings

Passivhaus is a standard of construction which enables the end user to consume 90% less energy in occupation, than that required in most traditional constructions. The 10% residual energy consumption can be met by renewable technologies to achieve a zero carbon building

Design Freedom

Despite general misconception, the standard does not restrict the design or aesthetics and this is proven by the architecturally diverse Passivhaus construction that has been completed to date. It is not a building system. The standard can be applied to any construction and building type

Healthy Environment

Passivhaus focuses design on achieving unprecedented levels of living comfort, eliminating draughts and maximising air quality

Thermal Stability

Consistent, draught free living environment at 18-22°C year round with no excessive temperature swings

Prevention of excessive Humidity

Condensation and mould growth eliminated

Excellent Indoor Air Quality

Continuous supply of fresh filtered air, providing a dust and pollen free environment, improving the quality of living for allergy sufferers. Reduced Carbon Dioxide levels

Acoustic control

From external sources, such as urban noise, as well as internal acoustic control between rooms

Total User flexibility

Openable windows controlled by the occupier as they so wish. Temperature comfort levels designed to meet occupier’s needs

Excellent Daylighting

Window location and orientation optimised for living spaces

Phi architects believe that sustainable design excellence is always the priority; a fabric first approach is inherent to our philosophy and where possible the Passivhaus standard is set as the benchmark.

Sara qualified as a Certified Passiv Haus Designer at the BRE (Building Research Establishment) in 2012. Designs are modelled using the Passiv Haus Planning Package software. If you are interested in building a new dwelling to this standard or to refurbish an existing dwelling along these principles (to EnerPHit standard), please contact us to discuss your project.

In 2017 Sara also completed the Carbonlite Retrofit course with the AECB (Association of Energy Conscious Builders) which complements designing to the EnerPHit standard for existing residential properties.

If you are considering upgrading your home thermally, we can provide independent advice on the most cost effective methods of reducing your heat losses.