NatureScot updated the Scottish biodiversity metric calculation tool on 22nd October 2026 to resolve minor functionality issues in the workbook being tested by applicants and planning professionals. The change affects the live consultation version of the tool, not an adopted legal requirement or a final replacement for existing biodiversity assessment methods.
The consultation covers Scotland and runs from 31 August to 30th November 2026. Ecologists, developers, planning authorities and land managers can download the revised spreadsheet and related guidance, test how it handles Scottish habitats and send comments to NatureScot before the consultation closes.
For me, the important distinction is between a useful technical update and a change in planning law. The Scottish system is developing a more consistent way to describe biodiversity change, but the calculation tool is still being tested. A spreadsheet result cannot, by itself, determine whether development satisfies Scottish planning policy.
What changed in the Scottish biodiversity metric?
NatureScot’s official consultation documents page now states that the calculation tool was updated on 22 October to correct minor functionality problems. It directs users to the version-history sheet inside the workbook for the details. The announcement does not identify a new statutory threshold, revised national policy or an approved final methodology.
That matters for anyone who downloaded the workbook earlier in the consultation. Before comparing calculations or submitting feedback, check the version-history tab and make sure the latest tool has been used. Where results have already been shared between an ecologist, applicant and authority, it is sensible to record which workbook version produced them.
The consultation pack contains a user guide, an Excel calculation workbook and habitat condition assessment sheets. NatureScot says those spreadsheets may not be fully accessible to people using assistive technology, so accessibility is also a legitimate topic for feedback. The Scottish biodiversity metric remains a working consultation product, with Version 1 expected in spring 2027.
How the Scottish biodiversity metric is intended to work
At its simplest, a biodiversity metric translates information about habitats into a structured numerical assessment. The Scottish workbook uses habitat information and an assessment of condition to derive biodiversity units. Those units can help explain how much habitat value may be lost, restored or created through a development proposal, and where better siting or design would avoid the most damaging effects.
NatureScot is adapting the English statutory metric to Scottish habitats and Scottish planning policy rather than copying England’s rules. The underlying habitat classification approach relies on UK Habitat Classification, commonly called UKHab, although users will need to understand Scottish upland and semi-natural habitats as well as standard survey categories.
The calculation is intended to support professional judgement, not replace it. A numerical result cannot capture every protected species, ecological connection or site-specific risk. Conversely, the fact that a proposal shows some calculated uplift does not necessarily mean the planning authority must grant permission. The ecological evidence and the wider development plan remain important.
What National Planning Framework 4 actually requires
Scotland’s NatureScot explanation of the project links the Scottish biodiversity metric to Policy 3b of National Planning Framework 4 (NPF4). That policy is particularly relevant to national and major development and to proposals requiring environmental impact assessment. Such schemes must demonstrate significant biodiversity enhancement, in addition to measures that mitigate adverse effects.
The policy does not prescribe the new metric as the sole acceptable method of showing enhancement. NatureScot confirms that qualitative and quantitative evidence can both be appropriate and that best-practice assessment and professional judgement are essential. Scottish Government biodiversity planning guidance also warns against holding up decisions solely because a universally adopted Scottish metric is not yet available.
Smaller local development should not simply be presented as subject to the identical Policy 3b tests. NPF4 Policy 3c concerns biodiversity enhancement for local development, and NatureScot has separate Developing with Nature guidance for that work. Applicants need to identify the right policy context before choosing an assessment tool.
Peatland makes the Scottish approach distinctive
The consultation looks closely at peatland. NatureScot is also seeking views on a field-based rapid assessment tool developed by the University of the Highlands and Islands, intended to help assess the condition of peatland habitats. These ecosystems are especially important to Scottish development proposals involving energy infrastructure, access tracks, forestry and upland land management.
Unlike the English statutory metric, which treats some irreplaceable habitats differently from ordinary habitat calculations, the proposed Scottish approach is designed to calculate losses and compensation across all habitat types. NatureScot nevertheless makes clear that the authority must still determine whether any particular loss or impact is acceptable. Being able to calculate a number is not permission to damage a sensitive bog.
There is also an important commercial difference. NatureScot says there are no plans for a Scottish statutory biodiversity credit-purchase scheme equivalent to the English last-resort credits system. Consultants and developers should therefore avoid advertising Scottish biodiversity units as though they automatically create the same credits market as in England.
What should practitioners test before 30 November?
The strongest consultation responses will be grounded in actual use. An ecology practice could test whether commonly encountered Scottish habitats can be recorded consistently. A developer might check whether the tool distinguishes high-value habitats clearly enough to change a site layout. A planning authority could focus on whether the results are understandable, auditable and proportionate when attached to an application.
NatureScot specifically asks people to comment on what works as well as what needs improvement. Users can test the Scottish biodiversity metric workbook, review its version history, compare outputs against existing ecological assessments and describe practical problems with the user guide, habitat condition scoring or spreadsheets. They should also distinguish technical errors from disagreements about the policy weight to give a result.
The Scottish biodiversity metric consultation is being managed through the Commonplace platform, with alternative arrangements listed on the NatureScot consultation page for people who cannot use it. Responses are due by 30th November 2026. There is no indication that this technical update has extended the deadline.
What this means for live Scottish applications
I would not recommend waiting for Version 1 before carrying out the ecological work a current application needs. Instead, establish the relevant NPF4 policy, survey the site properly and use the most appropriate evidence for the proposal. If the consultation workbook is being used, identify its version and explain how its output informs, rather than replaces, the planning judgement.
NatureScot recognises that applying the draft spreadsheet retrospectively to completed field surveys may present practical difficulties. Its guidance says users should decide whether to apply the consultation version to a live application on a case-by-case basis. Outputs may change when Version 1 is released next spring, so they should not be described as permanent or statutory figures.
The Scottish biodiversity metric may eventually make Scottish biodiversity assessments more consistent, especially for significant developments. For now, the confirmed news is a technical workbook update on 22 October and a still-open consultation. The latest NatureScot documents, rather than an older saved spreadsheet, are the appropriate starting point for anyone preparing a response. For the wider legal and policy context, see our Planning in Scotland guide.
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