England’s planning system is about to make a targeted adjustment to biodiversity gain. Regulations made on 9 July 2026 and due to come into force on 6 August 2026 reshape how some smaller and lower-risk developments are handled, while keeping stronger protections around priority habitats. For readers outside the planning world, biodiversity gain is the rule that development should leave nature in a better state than before. This statutory instrument does not remove that principle. Instead, it redraws where the full planning condition applies and gives non-major schemes more flexibility over how habitat gains are delivered.

One of the most practical changes sits inside the biodiversity gain hierarchy. According to the explanatory note, for development that is not classed as major, onsite habitat enhancement, onsite habitat creation and the use of registered offsite gains will now sit at the same level of preference where onsite habitat is harmed. That matters because smaller schemes do not always have the space or ecological conditions to improve habitat in one fixed order. Under the new approach, planners and applicants can focus on the option most likely to deliver measurable habitat value, while biodiversity credits remain a back-stop rather than an easy first choice.

The new exemption for sites no larger than 0.2 hectares will draw the most attention. If a development is on a site of 0.2 hectares or less and does not affect an onsite priority habitat, the biodiversity gain planning condition will not apply to planning permissions made on or after 6 August 2026. This is a meaningful easing for the smallest sites, but it is not a free pass. The red line is priority habitat, and the Regulations are clear that habitat is impacted where it is lost or degraded and its biodiversity value falls. In practice, that makes early ecological checks more important, not less, because the exemption depends on showing that a site is genuinely low risk.

A second exemption covers temporary development, again only where no onsite priority habitat is affected. If the whole development is temporary and the specified period is five years or less, the biodiversity gain planning condition will also fall away for relevant new permissions from 6 August 2026. That could remove friction for time-limited uses where land will later be reinstated, but the drafting closes off obvious loopholes. Developers cannot keep extending the same temporary scheme in stages so that the combined period runs beyond five years. For councils, that should make enforcement clearer and encourage realistic end dates from the outset.

There is a firmer edge to the package as well. The Regulations remove the existing exemption for certain self-build and custom build development, signalling that ministers want the system to focus more closely on ecological risk and site characteristics than on who is delivering the homes. The change is balanced by transitional rules designed to avoid mid-process confusion. Applications submitted before 6 August 2026 will continue to be assessed under the earlier framework in several cases, and the same protection carries through for some section 73 applications, which are used to vary conditions on an existing permission. For applicants already in the system, that should limit sudden rule changes after design work and surveys have already been completed.

For habitat protection, the overall picture is mixed but workable. Priority habitats remain the hard boundary, biodiversity credits are still treated as a last resort, and non-major development gets more room to choose the most realistic habitat solution. The result is a rulebook that looks lighter for very small or temporary schemes without stepping away from the idea that nature should count in land decisions. The next few weeks are likely to be busy for local planning authorities, ecologists and small developers. The sensible response is straightforward: confirm site size early, screen for priority habitat at the start, be precise about whether a proposal is truly temporary, and update local validation notes before 6 August. If that happens, these amendments could do something planning rules rarely manage on their own: cut unnecessary process while keeping attention fixed on the habitats that need the strongest protection.