Research from the HBF has found 84% of builders continue to find BNG implementation challenging.

Over half (60%) of respondents told HBF that BNG rules had influenced their decision not to pursue sites that may previously have been viable.

Uncertainty around agreeing on the cost and type of biodiversity enhancements needed on a site was viewed as a major cause of concern.

Local authority capacity remains a significant challenge for the delivery of BNG, as delays in reviewing biodiversity assessments continue to affect a large proportion of builders.

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The majority (80%) of respondents in 2026 reported planning delays due to BNG. Similarly, 66% cited insufficient resources or expertise, compared with 79% last year, showing some progress, but persistent gaps in council capacity are still slowing development.

As such, the HBF is using these findings to urge the government to reform BNG in a way that doesn’t restrict housing supply.

The HBF wants the government to consider the cumulative cost of policies builders are forced to comply with, with further support for SMEs through a higher small sites threshold.

“The home building industry supports the goals of BNG and remains committed to delivering new homes alongside meaningful improvements to nature,” said Neil Jefferson, CEO at the HBF.

“However, we need the government to provide greater clarity and ensure a consistent approach across local authorities and to provide support for SME builders so that these requirements do not become a barrier to delivering much-needed housing.”