Why PassivHaus

Why PassivHaus

A PassivHaus is a building that provides a high level of occupant comfort while using very little energy for heating or cooling.

PassivHaus is an energy efficiency standard for both domestic and non-domestic buildings pioneered in Germany, that reduces space heating and cooling demand to such a low level that conventional heating or cooling system is no longer required. A PassivHaus building achieves up to 75% reduction in space heating requirements, compared to standard practice for UK new build.

A PassivHaus building must meet the following criteria:

SCP ensure design and assessment of compliance is done by the use of the following software:

The low heating demand of PassivHaus building of less than 15 kWh per m2 per year means that annual fuel costs are reduced to £25-75 on space heating per year for 2-3 bed property. When coupled with renewable energy sources, the total energy bills could be as low as £0 a year.

EnerPHit Standard

EnerPHit is a slightly relaxed standard for low energy retrofit projects where the existing building fabric and conservation issues make achieving strict PassivHaus Standards unfeasible. Both criteria are summarized below:

  PassivHaus EnerPHit
Specific Heat Demand ≤ 15 kWh/m2 .a ≤ 25 kWh/m2 .a
Primary Energy Demand ≤ 120 kWh/m2 .a ≤ 120 kWh/m2 .a
Airtightness n50 ≤ 0.6-1 n50 ≤ 1.0-1
Accreditations and Affiliations