The UK Net Zero Carbon Buildings Standard Performance Evaluations

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27 May 2026

A new designation will recognise buildings’ progress on the path to Net Zero Carbon Alignment. The UK Net Zero Carbon Buildings Standard (UK NZCBS) Performance Evaluations will enable buildings to verify performance against the Standard’s requirements, even if they are not meeting all of them.

The UK Net Zero Carbon Buildings Standard Version 1 (the Standard), published March 10th, robustly defines what a building needs to do to be Net Zero Carbon Aligned in the UK. The Standard’s limits are based on the UK’s carbon and energy budgets: all of its requirements must be met and verified to achieve conformity. Buildings that don’t meet all the requirements cannot claim to be Net Zero Carbon Aligned. Not all buildings will be able to meet the Standard straight away, so it is important to upskill the industry and support plans for buildings to conform in future: UKNZCBS Performance Evaluations have been created to address this need.

The mission of the Standard is not just to create a definition, but also to drive market transformation towards net zero carbon and create consistency within the industry.

In pursuit of these goals, a separate Performance Evaluation designation is being introduced, allowing buildings to be evaluated against the Standard’s requirements, where they are not able to meet all the requirements to be Net Zero Carbon Aligned. Launching at the same time as the Standard’s verification in Q2 this year, UK NZCBS Performance Evaluations will require the same level of verification as for a Net Zero Carbon Aligned claim, and the output will provide a robust indication of how the building is performing across different aspects of the Standard’s requirements.

While not the same status as being Net Zero Carbon Aligned, a verified Performance Evaluation acts as a “report card” for the building, using the same metrics and measurements. They also show how closely a building performed against the applicable limits in the Standard. This represents an important step on a building’s decarbonisation journey, both through reporting of in-use performance, and following the process: learning to measure and assess performance against the Standard, and to access and understand the relevant data.

Performance Evaluations make it an easy decision to pursue the Standard: evaluated buildings either receive Net Zero Carbon Aligned status, or a transparent, verified evaluation of how close they came.

The intention of introducing Performance Evaluations is to support widespread adoption of the Standard, acting as a “building MOT” that shows where attention is needed to meet its requirements. They encourage transparency about building performance, provide a robust indicator of a building’s progress on the journey towards being Net Zero Carbon Aligned, and contribute to the evidence base that will inform the future development of the Standard.

Performance Evaluations are also a mechanism for industry-wide improvement. Every building that pursues a Performance Evaluation has gone through a data-gathering and measurement process with the Standard's requirements in mind. The more buildings that go through that process, the more the industry as a whole moves in the right direction – driving down carbon emissions and reinforcing the skills and knowledge needed to reach net zero.

David Partridge, Chair of the Governance Board of the UK Net Zero Carbon Buildings Standard, said: “Performance Evaluations will further drive market transformation towards achieving Net Zero Carbon by 2050. They will allow users to report on their building’s journey to Net Zero Carbon Alignment by measuring and understanding its performance, which also allows for potential use in reporting within ESG, legal and regulatory processes. This will help to drive the industry towards adopting the Standard’s metrics, resulting in upskilling and verified data collection and a nationally consistent and transparent reporting methodology, which is what the industry has been crying out for.”

Christopher Jockel – Associate Director – Corporate ESG, Bureau Veritas, and Bureau Veritas / UK NZCBS Verification Development Project Lead, said: “Bureau Veritas is used to working with verification clients on upfront methodology validations, pre-verification ‘readiness’ assessments and non-accredited benchmarking assessments against carbon, GHG and wider sustainability standards. So when UK NZCBS stakeholders called for something like, and what finally became, Performance Evaluations, we understood its value and supported the concept.”

Jockel added: “We have since worked closely in partnership with the Standard to make Performance Evaluations a reality on the verification side, supporting wider engagement with the Standard. The rigour of the verification process for both Performance Evaluations and Net Zero Carbon Alignment will drive industry-wide improvements, and reinforce the skills and knowledge needed to reach net zero.”

Simon Wyatt – partner, global head of sustainability, Cundall and member of the BCO ESG Committee, said: “The introduction of the Performance Evaluation designation responds directly to industry concerns about the binary pass/fail approach to Net Zero Carbon Aligned status. By recognising projects that are making measurable progress, even if they have not yet met all criteria, this initiative encourages broader engagement with the Standard. BCO fully supports this approach and encourages office developers and owners to participate. We look forward to continuing our collaboration with the Standard to address our members’ concerns and to further drive adoption across the industry.”

Picture: Indicative representation of an example Performance Evaluation graphic - currently undergoing further development.

Article written by Dave Mapps | Published 27 May 2026

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