Prove your building’s quality.

Outstanding NABERSNZ ratings for your buildings.
ESP provides the experience and tools to efficiently achieve the NABERSNZ ratings required by high-quality tenants and government agencies.

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Our clients have avoided
0,000,000kg of carbon emissions and saved
$0,000,000 in utility costs.

Trusted by outstanding businesses.

Auckland Council Energy Efficiency
Auckland Council Energy Efficiency
Independent efficiency ratings.


As pressure increases to reduce emissions and improve efficiency, a NABERSNZ rating offers a detailed and objective measure of your building’s energy performance.

We’re the largest assessor of NABERSNZ ratings in New Zealand. We’ve combined energy expertise with cutting-edge technology to create a thorough and cost-effective assessment process that’s used by some of the country’s largest organisations.

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“We believe adopting environmentally sustainable practices like NABERSNZ is the right thing to do and we see it as a win-win outcome on every level.”

Ryan Carter

Portfolio Manager, 151 Property


NABERSNZ helps you to accurately measure, understand and communicate the environmental performance of your building, while identifying areas for cost savings and future improvements.

Operated by the New Zealand Green Building Council (NZGBC) on behalf of the Energy Efficiency and Conservation Authority, NABERSNZ gives office and government buildings or individual tenancies an annual rating of zero to six stars on how well they use energy. The ratings must be updated yearly.

Types of NABERSNZ ratings.

There are 3 types of NABERSNZ ratings, suitable for different occupants and businesses.

Base build.

A base build rating measures the energy performance of a building’s core services, such as lifts, stairwell lighting, common toilets, air conditioning, ventiliation, etc.

Suitable for: commercial property owners & property managers.


A tenancy rating measures the floors or areas occupied exclusively by a tenant, including energy use such as computers, lighting, data centres, and staff kitchens.

Suitable for: commercial building tenants.

Whole building.

A whole building rating combines base building and tenancy ratings.

Suitable for: commercial property owners & property managers.

Why ESP?

We make NABERSNZ simple.

To achieve efficient and cost effective results, a range of services and technology are required to measure, monitor and achieve and sustain quality NABERSNZ ratings. ESP’s integrated service offering and extensive experience allows us to deliver more effective energy and environmental results, whether you are looking for a whole building, base build or tenant rating.

We’ve refined our process over hundreds of sites, ensuring that you get accurate, actionable insights through a straightforward, thorough methodology.

Get in touch for a no obligation discussion

Want to know more?

Want to know more?

Get in touch for a no obligation discussion

Client engagements.

Don’t just take our word for it.

Here are some real world examples of what NABERSNZ clients have achieved with our help. If they sound like the results you want, let’s talk.

You have a vision. We have a way to get you there.

Let’s talk 0800 222 ESP

You have a vision. We have a way to get you there.

Let’s talk 0800 222 ESP

Frequently Asked Questions

A building with a cafe can be NABERSNZ rated. The assessor will confirm whether the cafe is used for only tenant purposes, our whether it is available to the public. So it can be determined whether the area and energy consumption should be included or excluded.

No, All three NABERSNZ rating types (base building, tenancy and whole building) rate the ongoing energy efficient performance of the building. In reality, basebuild rating results can be capped in some instances due to particular design limitations. However, this must be accounted for in any renewal or refresh works.

Yes, that is correct. New Government leases must be 4 star or greater already. These increase over time. More information can be found here.

NABERS in Australia provides ratings including water. NABERSNZ currently is energy efficiency only, and there are no plans currently to introduce water ratings. The Green Star Performance rating tool captures water use.

How should gas and water consumption be converted to KWH/sqm for Greenstar rating purposes?

Typically we will submeter the relevant HVAC/basebuild loads on each floor to account for these loads in the calculation. This metering is common in many buildings we monitor.

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