Green Building Certifications Explained: NABERS, Green Star, LEED, and BREEAM

For facility teams across Australia and New Zealand, green building certification has moved from a marketing exercise to a leasing and investment requirement.  

Institutional tenants increasingly specify minimum NABERS or Green Star ratings before signing leases, and portfolio owners face growing pressure from investors to report against internationally comparable ESG benchmarks. For FM managers, that shifts certification from a one-off project handled by consultants into an ongoing operational responsibility.

Sustainability officers, meanwhile, are being asked to justify certification spend against measurable outcomes - lower utility bills, higher asset value, and reduced vacancy.  

Understanding what each scheme actually measures, and where the real operational effort sits, is the difference between chasing a plaque and running a building that genuinely performs.

What Are Green Building Certifications, and Why Do They Exist?

At their core, green building certifications exist to solve an information problem: without independent verification, "sustainable building" claims are impossible to compare or trust.  

Each scheme sets a structured framework - categories, credits, and evidence requirements - that an accredited assessor uses to award a rating, usually on a star or point-based scale.

The four schemes most relevant to Australian facility teams each answer a slightly different question:

• NABERS measures actual, metered operational performance over the past 12 months.

• Green Star measures the sustainability of design, construction, or ongoing operational management practices, administered by the Green Building Council of Australia (GBCA).

• LEED (Leadership in Energy and Environmental Design) is a US-developed scheme used internationally, most common in Australia on buildings owned by global funds seeking a consistent rating across markets.

• BREEAM (Building Research Establishment Environmental Assessment Method) is a UK-developed scheme with similar international investor recognition, though far less common locally than NABERS or Green Star.

NABERS vs Green Star: What's the Difference?  

This is the comparison Australian FM teams navigate most often, because the two schemes are frequently used together rather than as alternatives.

• What it measures: NABERS measures actual operational performance (energy, water, waste, IEQ), while Green Star measures design, construction, or operational sustainability practices

• Basis: NABERS is based on metered data from the previous 12 months, while Green Star is based on points earned across multiple sustainability categories

• Rating scale: Both NABERS and Green Star use a 1–6 star rating scale

• Best suited to: NABERS suits existing, occupied buildings, while Green Star suits new builds, fitouts, or ongoing performance management programmes

• Reassessment: NABERS ratings are reassessed annually, while Green Star reassessment varies by tool, with performance-based ratings requiring annual resubmission

The practical relationship: a building might achieve a Green Star rating during design and construction to demonstrate its potential, then pursue an annual NABERS rating once occupied to confirm it's actually performing as intended. Where a building already holds a NABERS rating, that data can typically be credited toward relevant Green Star performance categories, reducing duplicated reporting effort.

How Do You Choose the Right Certification for Your Building?

For FM managers weighing up which certification to pursue, four questions narrow the decision quickly:

1. Is the building new or existing? New builds and major refurbishments suit Green Star or LEED; existing occupied buildings suit NABERS.

2. Who is the audience for the rating? Local tenants and investors typically expect NABERS or Green Star; international investors may require LEED or BREEAM for portfolio comparability.

3. Is a lease covenant driving the requirement? Many commercial leases now specify a minimum NABERS Energy rating - check lease terms before assuming a design-stage certification is sufficient.

4. Can the building sustain annual reporting? NABERS and Green Star Performance both require ongoing data submission, not a one-off assessment, so factor in the resourcing this demands over time.

Most portfolios end up running more than one scheme concurrently - which is normal, provided the underlying data supporting each certification is accurate and easy to retrieve.

Turning Certification Into Ongoing Operational Performance

A certification plaque is a point-in-time achievement; maintaining the rating is an operational discipline. The FM teams that sustain strong ratings year after year typically:

• Track energy, water, and waste data continuously, rather than compiling it only when a reassessment is due.

• Link maintenance activity to performance metrics, so equipment degradation that could affect a rating is flagged early.

• Keep certification evidence and building performance data in one accessible record, rather than scattered across consultants' files.

This is where certification and day-to-day facility management genuinely intersect.  

A facility management system that consolidates energy data, maintenance history, and asset condition in one place makes annual resubmissions and performance reporting significantly less resource-intensive - turning green building certification from an annual scramble into a natural output of good operational data.

Choosing the Right Green Building Certification: Build Long-Term Value with the Right Sustainability Framework

Green building certification isn't a single standard - it's a set of tools, each answering a different question about how a building performs.  

For facility and sustainability teams, understanding when green certification applies, and how they interact, is what turns certification from a compliance exercise into a genuine performance advantage.

Want to see how connected building data can simplify your certification reporting? Book a demo with FMI Works to explore how a purpose-built facility management system can support your sustainability programme.