What Is The Fabric Energy Efficiency Standard?
The Fabric Energy Efficiency Standard (FEES) is the proposed maximum space heating and cooling energy demand for zero carbon homes. This is the amount of energy which would normally be needed to maintain comfortable internal temperatures and in a dwelling this can be influenced by:
- Building fabric U-values
- Thermal bridging
- Air permeability
- Thermal mass
- External heat gain (solar)
- Internal heat gains such as metabolic activity or as a by-product of services
FEES should ensure that a good minimum standard for fabric (the longest-lasting part of a home) will be embedded in all new homes. It is measured in kWh/m2yr and is therefore not affected by carbon emission factors for different fuel types.
The Fabric Energy Efficiency Standard allows flexibility in design approach, and can be achieved in a variety of ways and with combinations of different materials or product specifications.
For the majority of homes, levels of 39 and 46 kWh/m2/year are proposed:
- 39 kWh/m2/year for apartment blocks and mid-terrace homes.
- 46 kWh/m2/year for end terrace, semi-detached and detached homes.