A new industry-backed framework designed to define what qualifies as a net zero carbon building in the UK has officially launched.
The UK Net Zero Carbon Buildings Standard aims to provide a consistent method for measuring and verifying building emissions, helping the property and construction sectors align with the UK’s long-term climate targets.
A cross-industry framework
The Standard has been developed through collaboration between several organisations, including the UK Green Building Council (UKGBC), Royal Institution of Chartered Surveyors (RICS), Chartered Institution of Building Services Engineers (CIBSE) and Building Research Establishment (BRE).
More than 350 industry experts contributed to the framework’s development, which was tested on over 200 building projects through a pilot programme launched in September 2024.
According to the organisations behind it, the aim is to establish a clear and consistent definition of net zero carbon buildings while reducing the risk of misleading sustainability claims.
“The Standard will provide much-needed clarity and consistency to net-zero carbon claims, combating greenwashing and providing a robust definition for the industry to rally towards,” said Katie Clemence-Jackson, CEO of the UK Net Zero Carbon Buildings Standard.
Measuring operational and embodied carbon
The framework assesses carbon emissions across a building’s full lifecycle.
This includes operational emissions, such as those generated from energy used for heating, cooling, lighting and equipment during a building’s use. It also considers embodied carbon, which refers to emissions associated with construction materials, manufacturing, transport and the building process itself.
The Standard sets pathways for different building types and project stages, including new builds, major refurbishments and existing buildings. Sector-specific criteria are also included for a range of property types, from residential and commercial buildings to healthcare, education and data centres.
Updates following pilot testing
Feedback from the pilot programme has led to several updates in the final version of the Standard.
These include new guidance enabling landlords and tenants to certify individual parts of an office building where whole-building certification may not be possible. An additional annex also introduces optional “on track” checks at practical completion to assess whether a project is likely to meet certification requirements once operational data is available.
Further guidance has been included to help organisations align the Standard with other sustainability certifications, reducing the need for duplicate reporting.
Verification to begin in 2026
Although the Standard has now been published, formal verification and certification services are expected to begin in the second quarter of 2026.
Certification will rely on operational data from completed and occupied buildings, with annual verification expected to ensure performance continues to meet the Standard’s requirements.
A backdrop of policy change
The launch comes as pressure grows for the UK to accelerate emissions reductions in the built environment, which accounts for a significant share of national greenhouse gas emissions.
The UK government is expected to introduce updated Minimum Energy Efficiency Standards (MEES) for non-domestic rented buildings and finalise the delayed Future Homes and Future Buildings Standards. Reforms to the UK’s Energy Performance Certificate system are also under review.
Supporters of the new Standard say it could help provide a consistent benchmark for the industry as regulation and reporting requirements continue to evolve.