NABERS UK – Energy for Offices

NABERS Energy measures the efficiency of an office building and rates its performance. The energy rating works by comparing the energy consumption of a building against a set of benchmarks that have been developed using actual data.

NABERS Energy rates the base building performance. This includes central services like heating and cooling systems, lifts and lobby lighting, allowing office buildings to be compared based on how the central services are being run to provide a comfortable working environment for users.

There are two official documents which explain how the rating can be calculated – The rules for Energy for Offices and Metering and Consumption. These are an important reference for Licensed Assessors.

NABERS UK The Rules - Energy for Offices


NABERS UK The Rules - Metering and Consumption


The infographic below explains the Energy for Offices Registration Process for developers interested in obtaining an energy rating for their operational building. Once the first Building has received its NABERS Energy Rating it will be listed on Greenbooklive.

Is my building eligible for a NABERS Rating?


A building is considered eligible for a NABERS rating if all of the eligibility criteria detailed below are met:

a) Building type: during the rating period, the building or part of the building was used as an office, or, if unoccupied, capable of being used as an office.

Note 1: Purpose-built educational buildings (e.g. a school or non-office buildings on university campuses) or medical centre buildings are not considered educational office facilities or medical office facilities as they are not a tenancy within a commercial office building. Therefore, they cannot be assessed for a NABERS Energy for Offices rating.

b) Building consumption data: less than 80 % of the building’s total office NIA has been excluded due to lack of consumption data using the method described in Section 4.5.5 of the Rules for Energy for Offices.

c) Building energy coverage: the minimum energy coverage is met, as described in Chapter 6.

d) New buildings and major refurbishments: new buildings or buildings undertaking major refurbishments are eligible for a NABERS rating as soon as 12 months of a rating period can be completed. In these cases, the rating period can start as soon as one of the following conditions is met (whichever occurs first):
1) 75% of the office NIA is occupied by tenants; or
2) It has been two years since the certificate of completion was issued.

What if my building has had high levels of vacancy e.g. due to COVID-19?
Occupancy levels are only relevant for new buildings or major refurbishments, so essentially operational buildings with high levels of vacancy are eligible for a NABERS rating to be conducted. Please note however, there may be a difference in subsequent ratings if occupancy levels go back to pre-pandemic numbers. In Australia, some buildings have received higher ratings during that low occupancy phase, however some haven’t changed significantly as plant operations continue to run regardless of occupancy.

Benefits of a NABERS Energy rating


NABERS Energy ratings form the basis of a robust sustainability strategy. They provide a fair benchmark for a building’s energy efficiency, enabling comparison across the industry.

Validate and communicate

NABERS provides cost-effective, high-trust and independent validation of energy data, ensuring confidence in reporting it publicly and communicating it simply.

Track and improve

NABERS star ratings are an essential framework for annual reporting and sustainability strategies. With annual ratings, performance improvements and reduced energy and emissions can be delivered over time.

Competitive edge

Having a building that has a lower environmental impact, lower running costs and being able to communicate that simply and with confidence gives building owners the competitive advantage with prospective investors and occupiers.

How to get a NABERS Energy rating

To get a NABERS Energy rating you need a Licensed Assessor to undertake an assessment of your building.

Training is now available, and a Licensing pathway has been developed and the first Licensed Assessors have been receiving their Licenses since September 2021.
To receive a rating on your project you must contact a NABERS UK Licensed Assessor.


Estimate your NABERS rating


Two calculators are available for you to explore what star rating your building could achieve; a simple calculator and a reverse calculator. These are available in a single download below.

  • Use the simple calculator to get an idea of the NABERS rating your building may be able to achieve. Input building details and energy consumption data to generate a star rating.
  • Use the reverse calculator to estimate maximum energy use for a given star rating. Enter a target rating plus building details, energy consumption types and proportions. This will generate maximum allowable energy consumption.

Results are an indication only and may not be promoted or published.

Download both calculators here and select a tab.

NABERS UK is administered by BRE and overseen by NABERS as scheme owner on behalf of the New South Wales (NSW) Government in Australia.

For information on pricing please see our pricing page.

Resource Updates:

Useful Downloads

NABERS UK The Rules - Energy for Offices

NABERS UK currently offers one type of rating, NABERS Energy for Offices, which measures and rates the Base Building energy efficiency of an office. An accredited NABERS Energy for Offices rating is awarded when the Scheme Administrator certifies a rating completed by an Assessor.

The purpose of this document is to give clear requirements for Assessors when they are evaluating offices for their energy usage with the goal of providing a NABERS rating. It is intended that this document, be read and used alongside NABERS UK The Rules – Meteringand Consumption



NABERS UK The Rules - Metering and Consumption

This document presents the metering and consumption Rules that are common for NABERSEnergy for Offices ratings. It is intended that this document be read alongside  NABERS UK The Rules – Energy for Offices.

Its purpose is to provide the standard for the collection and assessment of metering and consumption data for energy. As such, it presents the minimum requirements of what Assessors must adhere to when they are conducting a NABERS rating.



Interim Ruling for Thermal Energy Systems v1.0 August 2021

This document provides rules for NABERS Assessors when undertaking assessments for ratings with shared thermal energy systems. It supersedes the 2008 NABERS document Validation Protocol for Thermal Energy Exclusions v2.0.



UK Ruling for Combined Heat and Power & District Heating and Cooling v1.0 June 2022

This document is a Ruling that provides additional instructions for Assessors that are required to use the following documents as part of accounting for district heating and cooling in a NABERS UK Energy Rating:

• Ruling: Treatment of Cogeneration and Trigeneration Systems v1.2 May 2022
• Standard Methodology in The Interim Rules – Thermal Energy Systems v1 2021.



NABERS UK Reverse and Simple Calculators

The reverse calculator for Energy for Offices helps you calculate the maximum amount of energy an office building can use to achieve a star rating that you specify.

The simple rating calculator for Energy for Offices helps you calculate the star rating of an office building for an amount of energy that you specify.



Shared Services and Facilities

This document is a Ruling for the treatment of shared services and shared facilities in precincts and mixed-use buildings. It provides guidance for Assessors where such
circumstances are present.

This Ruling will supersede the following documents:
a) NABERS Shared Facilities (20 May 2014)
b) NABERS Shared Services for Mixed-use Buildings (December 2015)



On-site Renewable Electricity Generation Systems

This document is a Ruling for the treatment of On-site Renewable Electricity Generation (OREG) systems and their subsequent renewable electricity. It provides guidance for Assessors where such systems are present.



Treatment of Cogeneration and Trigeneration Systems

This document is a Ruling for the treatment of either a cogeneration system or a
trigeneration system (“a system”). It provides guidance for Assessors where such systems are present either onsite or offsite relative to the rated premise and the metering and measurements of all scenarios.

The methodology presented in this document outlines how to use the calculator to determine the energy inputs to be entered in the NABERS rating input form, based on the apportioning of energy and the allocation of greenhouse gas emissions as determined by the calculator.

This Ruling will supersede the Interim Methodology for the treatment of Cogeneration and Trigeneration Systems in NABERS ratings (version 1.1).



Code of measuring practice

The purpose of the Code is to provide succinct, precise definitions to permit the accurate measurement of buildings and land, the calculation of the sizes (areas and volumes) and the description or specification of land and buildings on a common and consistent basis. This may be required for valuation, management, conveyancing, planning, taxation, sale, letting, or acquisition purposes.