As the built environment moves from net zero ambition to delivery, organisations are facing a shared challenge: how to decarbonise existing real estate portfolios in a way that is credible, verifiable and scalable. Retrofit now sits at the centre of climate action - and confidence in standards and evidence has become critical.

This roundtable brings together senior decision‑makers across real estate, standards, verification and sustainable finance who are grappling with the practical realities of delivery. At its core is the UK Net Zero Carbon Buildings Standard (NZCBS), developed to address fragmentation in the market by providing a clear, consistent framework for credible net zero performance across building types and lifecycle stages.

The discussion will focus on how NZCBS is interpreted and operationalised at portfolio level, the role of independent verification in turning standards into trusted evidence, and how this credibility - including through the lender perspective of the Loan Market Association (LMA) - helps bridge the climate finance gap for retrofit, moving ambition into real‑world action.