Environmental sustainability and housing growth

Status / emerging findings

• Local authorities lack ecological capacity to enforce environmental standards: many councils have no permanent ecologist, unable to monitor whether developers deliver required 10% biodiversity net gain, with evidence showing 47% of onsite habitats failed to be delivered.
• Critical data infrastructure is missing across government: no national platform integrates ecological data from developers, councils, and environmental agencies, fragmenting enforcement and preventing local nature recovery strategies from functioning effectively.
• Biodiversity net gain is functioning as policy but not yet proven at scale: only 12–14 months of operation with no completed schemes, approximately 90% delivered onsite, but private offsite market emerging; average management costs £200 per household with administrative overhead up to 60%.
• Government accepted need to work with recommendations but refused transparency on environmental compliance: ministers declined to publish separate compliance statements on how the Planning and Infrastructure Bill meets environmental principles, citing ministerial decision-making protection.
• Sustainable housing models exist but lack certification pathways: Nansledan delivered 24% biodiversity net gain and 97% EPC A ratings through patient capital, but innovative low-carbon materials face NHBC and lender barriers, preventing scaling.

Why it matters

The government's pledge to build 1.5 million homes while legally protecting nature depends on institutions (councils, agencies) that lack funding and data systems to enforce it—if local authorities cannot monitor compliance, biodiversity commitments become unenforceable.

Tone arc

Inquiry opened cooperative on feasibility of reconciling targets (January–February 2025), became critical during environmental enforcement sessions revealing capacity collapse in local authorities (February–June 2025), then toughened significantly after final ministerial evidence in July 2025 when ministers resisted transparency on environmental compliance with the Environment Act 2021.

Key witnesses

Matthew Pennycook MP (Minister for Housing and Planning), Mary Creagh MP (Minister for Nature), Natural England (Eamonn Boylan, Director), Environment Agency (Philip Duffy, Director), Local Government Association (Sarah Postlethwaite, Head of Planning), David King (Meadfleet Open Space Management – BNG implementation), Emma Toovey (Environment Bank – offsite biodiversity markets), Ben Murphy (Duchy of Cornwall – Nansledan sustainable development)