Why NABERS UK could change the sector dramatically and improve the path to net zero carbon
The launch of NABERS UK by the Better Buildings Partnership (BBP) is a significant milestone for the commercial office sector. I would even go so far as to predict it will become a game changer.
Why, you might ask? Surely, it’s just another certification scheme in a market that appears to be overloaded with such certifications.
What is NABERS?
The National Australian Built Environment Rating System (NABERS) is a six-star rating system that measures the energy use of buildings over the course of a year. It has been used in Australia for the past 20 years and has been mandatory for the last decade.
It also includes the ability to give 'commitment agreements' which are contracts signed by a developer or owner to design, build and commission a building (or retrofit) to achieve a specific NABERS energy rating.
NABERS UK will initially apply only to offices and will only cover base building use – this is the energy use under the control of the landlord. The commitment agreements will be called NABERS UK Design for Performance.
The first tranche of assessors are expected to be accredited by the Building Research Establishment (BRE), the newly appointed scheme administrator, in early 2021.
Factors influencing the significance of NABERS UK
The significance of NABERS is down to a number of factors:
- It measures operational performance and in-use energy of a building. This is a big deal because at the moment most certifications, such as Energy Performance Certificates (EPCs) are based on the designed or predicted energy use of a building not the real energy use. The NABERS system is based on a simple premise of ‘what gets measured, gets managed’ and this will see a long over-due focus on energy monitoring and management.
- It is market led with a high level of support in the sector. There are currently 37 funds signed up, under the aegis of the BBP, including leading sector players such as Aberdeen Standard Investments, Landsec and British Land. Investors want a reliable and standard metric to help them understand the energy use of buildings in operation before they buy them, and occupiers increasingly want this information before they commit to new leases. Australia has seen a green premium emerge in its commercial property market since this became mandatory. Higher rated buildings have less vacancies, longer leases and higher sale prices. This has so far been elusive in the UK market.
- It will help closes the performance gap. The UK currently has a linear approach to development where architects and technical designers model and implement a design but once handover is completed, they never have any involvement with the building again. They certainly rarely have to take responsibility for the actual energy consumption of the building in-use. The UK has also ended up with a ‘design for compliance’ culture where decisions are made at the design stage to help achieve building regulations but which often make no sense when it comes to real world energy use.
- The government is interested…very interested. This leads us to question the future of EPCs and the nature of statutory compliance in the UK moving forward. It did not go unnoticed that minister of state Kwasi Kwarteng helped launch NABERS UK and commented that it was exactly the ‘operational performance approach’ the government would be consulting on very soon. Australia saw impressive results when it mandated the system 10 years ago. The UK has a net-zero carbon target to reach in 2050 and the built estate emits 40% of all emissions.
- With BRE as scheme administrator NABERS UK gains a high level of credibility. The Building Research Establishment (BRE) was announced as the scheme administrator at last week’s launch to the ill-concealed jubilation of the Better Buildings Partnership and NABERS. Little wonder as it has now instantly become a more credible option to be taken seriously. Shamir Ghumra, head of building performance services at BRE, also commented that BREEAM, its current flagship certification system, would look to become a whole life performance approach for buildings that would recognise component certifications, such as operational performance energy ratings such as NABERS UK.
- It will fit with other systems and certifications. The UK Green Building Council (UKGBC) are considering developing
a ‘net zero’ badge
for buildings that would also take into consideration the use of operational performance ratings. Shamir Ghumra said he expected NABERS UK would, like BREEAM, help achieve higher GRESB ratings for funds as well.
- Its been tried and tested. NABERS has been in Australia for 20 years and has achieved impressive results over that time, including - 90% of buildings meeting their agreed energy targets, and a 33% reduction in energy usage over all buildings certified. NABERS UK will have a steering committee made up of BRE, BBP and NABERS Australia ensuring the UK will benefit from years of accumulated knowledge.
Challenges
Perhaps the biggest challenge to NABERS UK is the skillset and knowledge base of building modellers in the UK to undertake the Design for Performance approach and cope with the spectre of performance contracting that is becoming standard in Australia.
Building modelling software is not perfect, its outputs are only as good as the inputs, and the vast majority of modellers do not possess sufficient engineering knowledge to build useful models that will improve accuracy and recommendations.
This is acknowledged and CIBSE (Chartered Institution of Building Services Engineers) is already working on offering more training courses for NABERS assessors.
Resero and NABERS
However, for Resero it is good news. We are a delivery partner for NABERS UK and Design for Performance has been our general approach for quite some time.
Wherever possible we always create dynamic simulated digital twins to stress test theories, assumptions and decisions. We use our deep engineering knowledge to inform the modelling and question the default modes to make each model as accurate as possible.
Our work as MEP consultants mean the digital twins are constantly being updated, refined and calibrated with energy data collected from our contractor audits.
We are quite often involved in the tender processes, project management, planned maintenance programmes and cost plans associated with buildings. This ensures our sustainability recommendations and interventions are always tailored, feasible and deliver real outcomes.
Our software EDGE APM is aligned to NABERS UK as we already benchmark base building energy use so we can easily create a NABERS star rating and incorporate the annual reviews into our existing processes.
Lastly, our partnership with high profile external consultants means that we have robust quality assurance on all our modelling and can also offer independent design review expertise through Dr Claire Das Bhaumik, who is in the final stages of being admitted to the NABERS UK Design for Performance independent review panel.
If you’d like to know more about how we can help you prepare for NABERS UK ratings or taking a Design for Performance approach please email me jtreanor@resero.co.uk or call 01743 341903.








