Two frameworks dominate conversations about net zero carbon commitments in UK commercial real estate: the Science Based Targets initiative Corporate Net-Zero Standard and the UK Net Zero Carbon Building Standard. They are frequently confused, sometimes conflated, and occasionally set up as alternatives to each other. They are not alternatives — they operate at different levels and for different purposes. Here is a clear explanation of both and how they fit together.
What SBTi covers
The Science Based Targets initiative sets standards for corporate-level greenhouse gas reduction targets — targets for the organisation as a whole, covering its entire operational footprint (Scope 1 and 2) and material value chain emissions (Scope 3). SBTi targets are validated by the initiative against science-based criteria and, once validated, the organisation can claim that its targets are "science-based" and aligned with limiting global warming to 1.5°C.
SBTi targets are about the trajectory of the whole organisation over time — typically a near-term target (40-50% reduction by 2030) and a long-term net-zero target (90%+ reduction by 2050 or earlier). They are corporate commitments, not building-level assessments.
What NZCBS covers
The UK Net Zero Carbon Building Standard operates at the asset level — it assesses whether a specific building meets defined operational energy, embodied carbon, and on-site renewable targets that are consistent with a net zero carbon outcome for that building. It is a building standard, not a corporate standard.
An NZCBS assessment produces a finding about a specific building at a specific point in time — whether it is "NZC Aligned" or on a pathway to alignment. It does not make statements about the organisation that owns or occupies the building.
The key difference
SBTi answers the question: is this organisation reducing its emissions at a rate consistent with 1.5°C? NZCBS answers the question: does this building meet the technical criteria for being a net zero carbon building?
A property fund could have SBTi-validated targets and still own buildings that do not meet NZCBS limits. Equally, a fund could have NZCBS-aligned assets without having set SBTi-validated corporate targets. The two frameworks are complementary, not interchangeable.
Do you need both?
It depends on who you are and what you are trying to achieve.
If you are a property fund or REIT with institutional investors who scrutinise ESG commitments, the answer is increasingly yes — you need both. SBTi validation provides credibility for your corporate net zero commitment at the fund or company level. NZCBS assessments provide the asset-level technical evidence that your buildings are actually aligned with those commitments. Without both, there is a gap between corporate ambition and asset-level delivery that sophisticated investors will identify.
If you are a corporate occupier with a large property footprint, SBTi targets are relevant to your whole business — but NZCBS is primarily a landlord framework. What matters for your occupied properties is that your energy consumption data feeds into your GHG Protocol Scope 1, 2, and 3 inventory, and that your office selection decisions favour buildings with strong operational energy performance.
If you are a developer, NZCBS is directly relevant to every building you develop — it is the standard against which green finance providers, planning authorities, and institutional purchasers will assess your assets. SBTi is relevant if your development business itself has set corporate net zero targets covering Scope 1, 2, and 3.
How they connect in practice
For a property fund pursuing both frameworks, the connection point is the asset-level carbon data. The energy consumption and carbon intensity data collected for NZCBS assessments feeds into the GHG Protocol Scope 1 and 2 inventory that underpins SBTi target setting. The CRREM Misalignment Year analysis sits at the intersection of both — it provides the asset-level pathway data that connects individual building performance to portfolio-level decarbonisation trajectory.
The most efficient approach is to build a single data infrastructure that serves both frameworks — collecting asset-level energy and carbon data once, to a quality standard that meets the requirements of NZCBS, SBTi, GRESB, and TCFD simultaneously. This is the model we use with fund and portfolio clients, and it significantly reduces the duplication of effort that results from treating each framework as a separate data collection exercise. Get in touch to discuss our portfolio NZC strategy service.