Critical Insights into UK Retrofit and Future Homes Progress

Welcome to Net Zero News, your daily briefing on the UK’s transition to a low-carbon future.

A recent National Audit Office (NAO) investigation has uncovered alarming deficiencies in a government-supported energy efficiency initiative. The report found that 98 percent of external wall insulation installations affecting around 22,000–23,000 homes require remediation, with roughly 6 percent posing immediate health and safety hazards such as damp, mould or poor ventilation. Similarly, 29 percent of internal wall insulation installations were defective, with 2 percent deemed a serious risk. Shockingly, by September 2025 only 8 percent of external and 10 percent of internal defects had been rectified, and total remediation costs could amount to £5,000–£18,000 per property for external work, and £250–£6,000 for internal. In extreme cases, homeowners faced structural repairs exceeding £250,000. The report also flagged potential fraud, estimating improper claims between £56 million and £165 million, and stressed that oversight across the scheme was fragmented and lacked clear accountability, urging urgent corrective action.

In contrast, positive retrofit interventions are moving forward. Lewisham Council secured £7.1 million from the Department for Energy Security and Net Zero’s Wave 3 Social Housing Fund, part of a broader £1.29 billion national retrofit effort. With an additional £9.1 million from local sources, the borough plans to retrofit up to 800 council homes to deliver warmer, healthier, energy-efficient dwellings, supporting its ambition for carbon neutrality by 2030.

Similarly, Riverside housing association is rolling out a £72 million retrofit programme with £36 million of government backing. This three-year initiative will upgrade more than 3,000 homes across Liverpool, Halton, Carlisle, London’s Enfield, and Middleton through measures such as insulation, double glazing, solar installations, and more. The initiative is expected to reduce fuel poverty, deliver environmental benefits, and foster local community engagement through employment and information sessions.

Meanwhile, the Future Homes Hub is actively supporting the industry’s preparation for impending regulatory changes. A campaign encouraging builders to get Future Homes Standard ready has been launched, offering guidance through ‘Future Homes Standard Essentials’, seven critical actions designed to help ensure new homes are low-energy, comfortable, and zero-carbon ready. Work is under way on a technical transition with tools such as the Home Energy Model, limited versions of which are due in mid-2025, and full functionality expected in autumn, ahead of legislative implementation in December 2026. A transitional period into late 2027 is anticipated, with mass building to the new standard by mid-2028.

Further reinforcing the transition, the Future Homes Hub has published its 2025 Whole Life Carbon Benchmarking Study, offering evidence-based data on embodied carbon performance across 48 assessments from 17 industry partners. This groundwork supports more informed, low-carbon construction decisions. The Hub has also developed a Biodiversity Net Gain (BNG) Good Practice Guide, which distils clear, context-rich guidance and checklists for delivering on-site BNG in new developments. Additionally, the Hub’s Net Zero Transition Plan, co-developed with Carbon Trust and industry stakeholders, is gaining traction: at its launch, 35 of the UK’s leading homebuilders committed to collaborating on carbon reduction strategies, data sharing, and implementation at scale.

Finally, leadership within the Hub is evolving: Jennie Daly CBE, Chief Executive of Taylor Wimpey plc, has been appointed Chair of the Future Homes Hub, taking on the role in June 2026. She succeeds David Thomas and brings a wealth of housing sector experience. Her appointment signals a continued focus on affordable, sustainable, community-centred development as the sector adapts to low-carbon mandates.

What this means:
The NAO’s findings serve as a wake-up call: despite significant retrofit policy ambition, delivery quality and oversight are critical vulnerabilities, remediation must be prioritised to safeguard homeowners and programme integrity. Yet, the contrast of well-funded local authority projects and housing associations demonstrates progress is possible with clear strategy and committed investment. The transition to the Future Homes Standard is gaining momentum, backed by practical tools, cross-sector collaboration, and strong industry leadership. If sustained, these efforts suggest a steering toward scalable, resilient, and equitable delivery of net zero housing across the UK.

Upcoming Events:
Net Zero Scotland Projects Conference -3 September 2026, Edinburgh

Net Zero Nations Projects Conference – 6 October 2026, Westminster

Do you have technologies, innovations or solutions that can help public-sector net-zero projects? Email: lee@net-zero.scot