RE:FIT- The National Carbon and Energy Performance Contracting Framework

Buildings are responsible for about 40 per cent of the UK’s total carbon footprint. We need urgent action to meet zero carbon emission targets. 

The RE:FIT Framework was established in 2009 as an award-winning programme part of the Mayor's £34 million Energy for Londoners wider programme. The Mayor of London's building retrofit programme allows public organisations to undertake projects to achieve substantial guaranteed annual cost savings, identify income generation opportunities, improve the energy performance of their assets and reduce their CO2 footprint.

The Mayor of London is launching RE:FIT5 (2026–2030) in March 2026, an improved national framework designed to help public sector organisations decarbonise their buildings efficiently and affordably. The RE:FIT 5 programme is designed to help public sector organisations achieve financial savings, improve energy performance of buildings and reduce carbon footprint. It is premised on a model whereby an energy service company guarantees a set level of energy performance and a future income stream to fund investment in energy-efficiency improvements.

RE:FIT5 builds on over a decade of success, offering a trusted route to guaranteed energy and carbon savings. This performance-based contracting framework helps public sector organisations to deliver decarbonisation and retrofit projects with guaranteed energy and carbon savings. It supports the aggregation of projects to scale up the impact and build long-term partnerships with service providers.

So far, RE:FIT has helped a range of organisations including London boroughs, NHS bodies, central government departments, schools and other educational establishments, and cultural and heritage organisations to implement retrofit projects.

Explore the impact in action through a range of case studies and project achievements which highlight how these organisations have delivered meaningful retrofit outcomes.