Commercial Performance
Clear guidance on NABERS ratings and the measured operational performance of Australian commercial buildings.
For building owners, asset managers, developers and sustainability teams assessing energy, water, indoor environment and long-term building performance outcomes.
Discuss Your NABERS RatingIn Brief
NABERS is an Australian building-performance rating system that measures how efficiently buildings operate in real use. Depending on the applicable rating, it can assess areas such as energy, water, waste and indoor environment quality using measured operational data.
Unlike design-stage modelling and construction-compliance pathways, NABERS focuses on occupied and functioning buildings. This allows owners, tenants, facility managers and project teams to understand how a building is actually performing over time rather than relying only on predicted design outcomes.
NABERS ratings are used across a range of commercial and institutional building types, including offices, shopping centres, hotels, apartment buildings and other large assets. Within the broader building-performance ecosystem, NABERS supports operational accountability, performance benchmarking and ongoing improvement beyond initial design and construction compliance.
Operational energy, water consumption, waste performance and indoor environment quality, depending on the building type and rating selected.
Design compliance predicts or documents intended performance, while NABERS measures what happens during actual building operation and occupancy.
Measured performance helps building stakeholders benchmark efficiency, identify improvement opportunities and track operational outcomes over time.
Knowledge Navigation
Use this guide to understand what NABERS measures, when a rating may be required, what operational building information is usually needed and what can influence assessment timing and cost.
Foundation
Understand how NABERS measures the real operational performance of buildings across areas such as energy, water, waste and indoor environmental quality.
Rating Requirement
Explore when a NABERS rating may be required or valuable for commercial buildings, leasing, sale, disclosure, government frameworks and ongoing asset performance.
Building Information
Review the consumption data, floor area, operating hours, occupancy details, metering information and supporting records typically needed for a NABERS assessment.
Project Planning
Understand how building size, rating type, data availability, metering arrangements and assessment complexity can influence the scope, timing and cost.
NABERS is a national rating system that measures the real environmental performance of buildings.
Unlike design based assessments, NABERS is based on actual operational data.
This includes energy use, water consumption, waste management, and indoor environment quality.
The result is a clear, comparable rating that reflects how a building truly performs in use.
For owners, developers, and tenants, NABERS provides a transparent way to understand efficiency, identify improvement opportunities, and benchmark performance against similar buildings.
NABERS is not required for every project.
However, it becomes essential when performance must be measured, verified, or disclosed.
You may need a NABERS rating if your project involves:
• commercial office buildings
• large scale developments
• buildings over 2000 square metres
• leasing or sale requirements
• government or institutional frameworks
In these cases, NABERS provides a trusted and recognised measure of building performance.
NABERS focuses on how a building performs in operation.
This includes:
• energy consumption and efficiency
• water usage
• waste management
• indoor environment quality
The rating is based on real data collected over a 12 month period, allowing for accurate comparison across buildings.
Rather than predicting performance, NABERS reflects what is actually happening.
As performance expectations increase, measuring real outcomes is becoming more important than meeting design intent alone.
NABERS helps bridge this gap.
It provides clarity on how buildings operate, enabling better decisions around energy use, tenant comfort, and long term asset performance.
For many organisations, NABERS is no longer just a rating.
It is part of how buildings are evaluated, improved, and positioned in the market.

A NABERS rating is based on measured operational data.
1 Data collection
Information such as energy bills, water use, and occupancy is gathered over a 12 month period
2 Normalisation
The data is adjusted to account for climate, building type, and usage patterns
3 Assessment
The building is rated on a scale from 1 to 6 stars, reflecting its environmental performance
This process ensures that each rating is consistent, comparable, and based on real conditions.
To complete a NABERS assessment, you will typically need:
• energy and water consumption data
• building size and usage information
• occupancy details
• access to relevant documentation
Our team will guide you through the process and ensure all required information is clearly defined from the start.
The time and cost of a NABERS assessment depend on the building size and the availability of data.
In most cases:
• data collection is the longest phase
• assessments can be completed once sufficient information is available
• timelines vary depending on project complexity
We recommend contacting us early so we can define scope, timing, and requirements clearly.
With extensive experience in building performance and environmental assessment, our team provides practical NABERS insights that support real project outcomes.
We work closely with building owners, consultants, and stakeholders to ensure results are accurate, actionable, and aligned with your project goals.
Small inefficiencies in operation and building use can quietly reduce performance over time.
Understand where buildings often fall short and how to avoid it.
Better performance comes from small, targeted improvements over time.
See where to focus and how to achieve a stronger NABERS outcome.
Many buildings are not designed to meet today’s performance expectations.
Retrofitting offers a way to improve real world performance by upgrading systems, materials and design strategies.
For projects aiming to improve their NABERS rating, this can play a significant role.
→ continue reading about retrofitting
Frequently Asked Questions
NABERS is an Australian performance rating system that measures and compares the environmental performance of buildings.
It assesses operational outcomes such as energy, water, waste and indoor environmental quality, expressed as a simple star rating.
Depending on the rating type, NABERS measures operational performance such as energy use, water consumption, waste outcomes or indoor environment quality.
NABERS applies to multiple building types including offices, shopping centres, hotels, apartments, schools, data centres and more, depending on the rating tool available.
Yes. NABERS ratings are based on real operational data over a defined period, reflecting how a building performs in use rather than design intent.
Section J and JV3 are design-stage compliance pathways, while NABERS measures how a building performs during real operation.
Common NABERS rating types include Energy, Water, Waste and Indoor Environment, each focusing on a different aspect of building performance.
Building owners, tenants, government agencies and asset managers may require or use NABERS ratings to benchmark and communicate building performance.
Typically energy or water consumption data, floor area, operating hours, occupancy assumptions and metering information are required.
NABERS ratings are time-bound and based on a defined rating period. They are typically updated as building performance data changes over time.
Yes. NABERS helps identify performance gaps and improvement opportunities across energy, water, waste and indoor environmental quality.
Yes. NABERS is widely used in ESG reporting and sustainability disclosure as a recognised benchmark for operational building performance.
NABERS supports the shift toward measured operational performance, linking real-world building use with long-term efficiency, transparency and sustainability outcomes.
Project Review
Send the available building information, energy data, floor area, occupancy details and performance objectives for an initial review. Certified Energy can help determine which NABERS rating pathway may apply and what information is likely to be required.
Early review can help clarify operational energy performance, rating readiness, data requirements and how NABERS may relate to leasing, commercial disclosure, building upgrades and the wider environmental performance strategy.
Last reviewed: June 2026. This page is maintained by Certified Energy as part of its Commercial Performance Knowledge Hub.