The NHER (National Home Energy Rating) is a method of assessing the energy performance and fuel cost of a dwelling. It uses a similar data set to SAP but includes more detail on occupancy, location and appliance use to give a more accurate calculation of CO2 emissions and running costs for a specific dwelling. The NHER rating is not a statutory requirement. It is often used by affordable housing providers to give a good indication of potential running costs of new properties - view »
The air-tightness of a building is known as its 'air permeability' or leakage rate. Air leakage can occur through gaps, holes or cracks in the fabric of the building envelope which are not necessarily visible to the naked eye. Air leakage will affect a buildings Co2 emission rate and forms an integral part of the calculation procedure contained within Part L of The Building Regulations - view
We have tried to make this website as accessible as possible and easy to use for everyone, regardless of circumstance or ability by working towards complying with Priority 2 of the W3C Web Content Accessibility Guidelines. We are continually making improvements to meet these guidelines, and our website has been designed with the following accessibility guidelines in mind:
The standard support browser versions are: