Developed, built and supported exclusively for New Zealand and Australia
NABERSNZ (National Australian Built Environment Rating System New Zealand) is the trusted standard for measuring and benchmarking actual energy performance in New Zealand commercial office buildings.
For property managers in New Zealand, using NABERSNZ is increasingly essential. It helps meet investor, tenant, and regulatory expectations, boosts asset value, supports leasing, and demonstrates sector leadership in sustainability. Accurate NABERSNZ ratings are now a central part of ESG (environmental, social, and governance) credentials in the New Zealand property market.
With BraveGen, managing your NABERSNZ process is streamlined and efficient. BraveGen acts as both an ESG platform provider and as an accredited NABERSNZ assessor, so you can rely on one partner for automated data management, expert advice, and official certification – all in a single, seamless workflow.
NABERSNZ is New Zealand’s official standard for assessing and certifying the energy performance of office buildings. The framework was adapted from Australia and is managed locally to provide a star rating between 0 (poor) and 6 (market-leading) based on a building’s actual energy use over the previous year.
You can obtain NABERSNZ ratings for either the base building (the areas and systems managed by the landlord) or for the whole building (landlord and tenant spaces together). Only an accredited assessor can certify your building. BraveGen offers this expertise in addition to their ESG management platform.
NABERSNZ ratings must be renewed annually to ensure your building’s performance status remains accurate.
NABERSNZ delivers significant value to property operations in New Zealand across several dimensions. Investor and market demand is a key driver, as ESG‑focused investors increasingly require NABERSNZ ratings to provide transparency and support risk assessment. Government agencies and large corporate tenants also play an important role, with many preferring or even requiring a minimum NABERSNZ rating as a condition for new leases.
For building owners, certification improves tenant attraction and retention, as energy‑efficient, high‑performing buildings appeal to quality tenants who value lower operating costs and improved comfort. Highly rated assets also tend to hold their value better and show greater resilience in the face of regulatory changes or fluctuating energy prices. In addition, NABERSNZ certification streamlines ESG reporting requirements and enhances the competitive positioning of assets in the market.
NABERSNZ works by providing an independent, standardised assessment of a building’s actual energy (and in some cases water) performance. The process begins when the building owner or manager engages a NABERSNZ Accredited Assessor, who collects and verifies relevant performance data – such as utility bills and building documentation – over a twelve-month period. The assessor evaluates the building’s performance according to specific NABERSNZ rules and methodologies, including accurate allocation of shared services and definition of asset boundaries. The results are converted into a star rating that benchmarks the building’s efficiency relative to others in New Zealand. Before certification is finalised, ratings undergo a quality assurance review, and a portion are subject to more detailed peer audits to ensure accuracy and integrity. The certified rating is then issued and can be used for compliance, market differentiation, or as a tool for driving ongoing performance improvements.
NABERSNZ reporting comes with several challenges that can impact your rating quality and certification timeline. Understanding these upfront helps you prepare better and avoid the frustrating delays and rework that plague many certification efforts.
Poor data management creates validation failures that can derail certification entirely:
Disorganized records create unnecessary complications during audits:
Unclear measurement scope can artificially impact performance scores:
Inadequate tenant involvement creates data gaps that compromise assessment accuracy:
Rushed preparation limits optimization opportunities and strategic options:
To avoid these challenges and ensure smooth NABERS NZ certification:
Getting ahead of these challenges early makes the difference between a smooth certification process and a frustrating experience filled with delays and rework.
BraveGen provides a complete end-to-end solution for organisations looking to streamline sustainability reporting, boost building performance, and manage carbon compliance. In fact, we are New Zealand’s largest NABERSNZ assessor. With its capabilities spanning software, consulting, hardware, and accredited assessment services, BraveGen offers an integrated path from data capture to audit-ready certification.
Accredited NABERSNZ Assessor: BraveGen delivers official ratings and certification, supporting every step of your NABERSNZ journey with trusted, audit-proven expertise.
Automate tenant and utility data collection, harness AI-powered alerts, and manage all sustainability data – energy, water, waste, and more – via a secure, centralised dashboard with real-time monitoring and variance detection.
Access expert advice, reporting guidance, audit preparation help, and building optimisation services. Proactive support tackles data gaps, improves rating outcomes, and builds climate literacy across your organisation.
BraveGen Connect, a robust IoT gateway, integrates seamlessly with the software platform, reliably capturing data from a wide range of building systems and sensors, and enabling near-real time performance analytics.
Easily extend your system to cover CRD and ASRS emissions disclosures with audit-ready carbon accounting. Support for spend-based, activity-based, and hybrid reporting ensures flexibility and confidence for all emission scopes.
Systems and outputs are designed for compliance, delivering regulator-ready and assurance-grade reports that make audits quick, hassle-free, and reliable.
A NABERSNZ rating is valid for 12 months. To keep your certification up to date, renew your rating every year. This approach helps ensure buildings are continually monitored, improved, and transparently reported.
NABERSNZ is designed for office buildings, both single properties and portfolios. Ratings can cover just the base building (central services), tenant spaces, or the whole building. Offices are currently the main focus for NABERSNZ, but more types of property may be included in the future.
Most buildings aim for at least 4 stars for strong performance, while 5 or 6 stars are awarded for leading efficiency.
A NABERSNZ rating is generally voluntary, but some government and large commercial tenants may require a minimum rating for office leases or contracts. More market participants are expecting or requesting NABERSNZ certification, so voluntary uptake is growing quickly.
You will need to provide 12 months of reliable, continuous energy consumption data. This includes utility bills or interval data, clear boundaries for building and tenancy areas, any occupancy figures, and evidence for meter calibration where needed. Good data organisation will speed up the process and avoid delays.
Yes. NABERSNZ certificates are recognised as verified evidence of building performance. They support reporting to stakeholders, help meet ESG goals, and are accepted by most benchmarking and assessment systems.
Common reasons include incomplete or missing energy data, poorly defined building or tenancy boundaries, inaccurate or unclear meters, or gaps in the supporting evidence. Keeping thorough, organised records and working with an assessor early helps avoid these problems.
You can improve your score by upgrading lighting, HVAC systems, and controls, regularly maintaining equipment, monitoring and managing after-hours usage, and engaging with tenants on energy-saving behaviour. Regular performance tracking helps spot and fix any problems early.
A NABERSNZ rating usually requires 12 months of operational data. If your building is very new or just renovated, you may need to wait until enough data is available before you can be formally assessed.
Choose an assessor with proven experience in similar buildings, a clear understanding of the process, and a current accreditation. A good assessor will also guide you through the preparation and help you understand what steps to take once the assessment is complete.
If you want to go even further, you may explore advanced certifications such as carbon-neutral building recognition. This involves additional requirements around energy offsets and emissions reductions.
Base building ratings cover services and areas managed by the building owner. Tenancy ratings are for areas controlled by occupants. Whole building ratings assess the combined performance. The best option depends on how your building operates and which data is most complete.
