NatHERS Certificate


By the introduction of HStar portal to create NatHERS certificates directly from the thermal modeling files of the modeling software, the national administrator for the NatHERS scheme now creates a detailed and well formatted document called NatHERS universal certificate. It offers a uniform and useful list of relevant information regarding the project, its component and the overall energy efficiency metrics of the dwellings resulted from assessment with a thermal modeling software.

Structure of a NatHERS certificate

A NatHERS certificate have several sections. The first page of the certificate is always allocated to show the details about the dwelling being certified, credential of the NatHERS assessor who performed the simulation, general construction elements’ specifications and the star rating performance of the dwelling. On the first page there is also a QR code which can be scanned to access the certificate on the HStar government portal. The next pages of a NatHERS certificate provide details about each element of the dwelling which has been addressed in the thermal assessment. These elements are all the envelope elements of a dwelling being floors, ceiling, roof, external walls, windows and skylights in addition to internal walls, ceiling fans and ceiling penetration elements. You can download a sample NatHERS certificate showing all these sections.

Class 2 multi unit buildings NatHERS summary certificate

While each unit of a multi unit residential development must have its own NatHERS certificate, since each one of these certificates can have many pages, putting all these pages on architectural plans is not possible. Therefore the results of thermal modeling of a multi unit development can be summarised in a different document which can be placed adequately on the architectural plans before being stamped and secured by the NatHERS assessor. This summary certificate shows general details of the project, average star rating performance of the whole multi unit development and then lists the certificates numbers, heating and cooling loads and star rating of each unit of the proposed development. To look at an example of this type of summary certificate you can download a sample of NatHERS certificate for multi unit.