Existing Homes thermal standardisation and specification

This document specifies data sets, fixed inputs and validation rules for existing homes, supplements the NatHERS Software Accreditation Protocol for existing homes and sets out the thermal settings which are different to new homes. It must be read in conjunction with:

• Software standardisation document for new homes - many of the new home settings are also applied to existing homes,
• Whole of home national calculation method - covers settings for fixed appliances and energy generation and storage,
• Existing homes technical note.

Existing Homes thermal standardisation and specification (pdf)