South Cambridgeshire BNG advice
Biodiversity Net Gain in South Cambridgeshire
Plan your South Cambridgeshire development around local habitats, planning requirements and practical biodiversity gains.
ACP Consultants can help with habitat surveys, biodiversity metric calculations and a practical BNG delivery plan for your South Cambridgeshire site.
Local planning guidance
Which planning authority and geographic policies apply in South Cambridgeshire?
South Cambridgeshire District Council determines ordinary district applications through the shared Greater Cambridge planning service. The adopted 2018 Local Plan includes NH/4 to NH/7. Check site allocations and masterplans for places such as Northstowe and Waterbeach.
Adopted policies and their effect on a development
| Adopted policy or plan | Date/status | Practical implication |
|---|---|---|
| South Cambridgeshire Local Plan NH/4 — Biodiversity | Adopted 27 September 2018 | Protect/enhance biodiversity, retain habitats and ecological networks, and secure appropriate evidence and mitigation alongside statutory gain. |
| NH/5 — Sites of Biodiversity or Geological Importance | Adopted September 2018 | Protect locally and nationally important sites; survey and mitigate relevant impacts independently of 10% BNG. |
| NH/6 — Green Infrastructure | Adopted September 2018 | Conserve, buffer, link and create multifunctional habitats and GI, particularly on settlement edge and strategic sites. |
| NH/7 — Ancient Woodlands and Veteran Trees | Adopted September 2018 | Separate protection for irreplaceable habitats, and proper ecological/arboricultural review where tree or woodland loss is considered. |
| Greater Cambridge Biodiversity SPD | Adopted by South Cambridgeshire February 2022 | Application assessment and metric guidance; 20% biodiversity ambition explicitly NOT set as a mandatory target by adopted SPD. |
| Greater Cambridge Planning Obligations SPD | Adopted April 2026 | Current guidance for proportionate legally justified S106, green infrastructure and stewardship obligations. |
Check the complete adopted development-plan document and proposals map against the actual red-line site. Other neighbourhood, saved or supplementary documents may be applicable.
Emerging plans and policy changes
The Greater Cambridge Proposed Submission Local Plan was consulted upon from 3 August to 25 September 2026 under Regulation 19 and remained unadopted as at 8 November. The draft BG/BG policy proposes a 20% BNG minimum for major development, with normally 10% for other eligible developments. This is an emerging proposal, not an adopted South Cambridgeshire-wide 20% threshold. The national 29 September 2026 NPPF Chapter19 N1(2) and N2(3) restricts planning weight given to higher-than-10% local BNG rules outside specially justified site allocations.
Therefore, the draft 20% must not be treated as fixed law, and historic references to the Greater Cambridge Doubling Nature Vision remain voluntary ambition in the adopted 2022 SPD. Existing 2018 South Cambridgeshire Local Plan/valid AAP policies and planning permissions continue to govern.
South Cambridgeshire BNG: NH/4, new towns and 2026 draft 20% route
Use the complete red-line site and application details. These routes point to actual evidence, not an automatic exemption or habitat-unit result.
1. Is the site in South Cambridgeshire district or Cambridge City, and are any Area Action Plans operative?
Use the red-line planning boundary, South Cambs adopted 2018 NH/4–NH/7 and any Northstowe/Waterbeach/Cambridge fringe AAP. Shared planning team is not a single LPA.
2. Is Greater Cambridge BG/BG 20% major BNG policy adopted?
No. Draft 2026 BG/BG proposed 20% for major schemes; national September2026 NPPF restricts blanket local higher than 10% targets. The 2018 plan/2022 SPD are operative.
3. What current BNG metric and council evidence should the application include?
Check Aug2026 exemption and onsite priority habitat, full vs small statutory metric, adopted 2022 Biodiversity SPD and April2026 Planning Obligations SPD, phase/outline permissions and precommencement BGP timing.
4. Which 2025 LNRS mapped measure fits the fen-edge habitat?
The final December2025 Cambridgeshire and Peterborough LNRS includes woodland/grassland/wetland/farmland measures. Match a real map measure, UKHab baseline and hydrology rather than automatic unit uplift.
5. Is this Waterbeach or Northstowe phase subject to adopted permission and stewardship obligations?
Waterbeach two outline consents include up to 6,500 and 4,500 dwellings; review actual parcel, approved design codes, GI/phasing and legal arrangements rather than treating a nature corridor as automatically registered offsite units.
Local planning guidance
What ecology and BNG information should be prepared?
A site in South Cambridgeshire should be checked against NH/4, NH/5, NH/6 and NH/7, the Greater Cambridge 2022 Biodiversity SPD, current official validation requirements and any applicable Area Action Plan or planning permission. In-scope schemes need reliable UKHab baseline mapping, habitat condition and valid statutory metric; trees, hedgerows, watercourse and protected species surveys vary by the real proposal. The April 2026 Planning Obligations SPD explains S106 processes, but a legal agreement or monitoring fee is not an automatic charge for every householder or minor application.
A final statutory Biodiversity Gain Plan is normally approved after permission and before development commencement where the condition applies. Relevant early design-stage ecological information can still be needed at application stage. For large phased new settlements, the statutory metric should be reconciled with approved outline parameters, site-wide landscape and water strategies, reserved matters, legally secured long-term nature areas and any ecological mitigation already required. A proposal at Northstowe or Waterbeach cannot simply market a phase-wide green network as independent saleable offsite units.
Where statutory BNG is applicable, start with a proportionate habitat baseline and a valid statutory metric. Maintain a clear relationship between the habitat plan, any landscape changes, the workbook and the written report. After permission, final Biodiversity Gain Plan approval is generally a separate pre-commencement stage.
Local planning guidance
Waterbeach New Town two real outline planning consents
The councils' Waterbeach New Town planning record identifies S/0559/17/OL approved in September 2019 for up to 6,500 dwellings, and S/2075/18/OL approved in December 2024 for up to 4,500 homes on the other land parcel, with related infrastructure and later phase approvals. The official project page also records a design code for phase one approved June 2020. This real planning evidence illustrates ecological network and long-term green-space coordination across two landholdings, not proof of a site-specific statutory gain outcome or ACP delivery.
Official evidence: Waterbeach New Town.
Local planning guidance
Local nature recovery priorities for South Cambridgeshire
The Combined Authority published the Cambridgeshire and Peterborough Local Nature Recovery Strategy on 23 December 2025. It was prepared with county partners and applies to the entire South Cambridgeshire District, including new settlements. Its map identifies recognised important areas and opportunities for woodland, wetland, grassland, farmland and watercourse habitat improvements. The district has fen-edge agricultural habitats, streams, mature hedgerows and landscape corridors connecting built-up areas to wider countryside. A proposed meadow or wetland should be compared with the exact mapped measure and local soil, water, existing species and habitat conditions.
Do not assume an LNRS focus area is automatically a registered offsite gain site or a 15% metric uplift. The Combined Authority approved an LNRS Delivery Plan in July 2026 to guide implementation and investment. It does not automatically add a new local planning policy, grant permission for a pond or bank, or replace South Cambridgeshire's adopted NH policies.
The relevant published strategy is Cambridgeshire and Peterborough Local Nature Recovery Strategy. The responsible authority is Cambridgeshire and Peterborough Combined Authority; the strategy status is Approved 26 Nov 2025, published 23 Dec 2025, delivery plan July 2026. The map or published opportunity layer is a source to evaluate, not a grant of planning permission, registered off-site units or an automatic metric strategic-significance result.
How to test a mapped opportunity
First, confirm the development boundary and current strategy edition. Then identify the specific mapped measure, rather than relying on a generic map colour. Compare the proposed habitat with the surveyed baseline, condition, soil, hydrology and delivery constraints. Record the strategy source/date and explain why the habitat measure matches, or state why it does not. No area-wide map can replace field evidence or the statutory user guide.
Local planning guidance
Habitats and site constraints around South Cambridgeshire
Use the habitats within and connected to your site to scope the surveys. These local settings help identify features that could affect the design.
Fen-edge farmland, hedgerows and wetland
North of Cambridge, fen-edge farmland, droves, channels and ditches can support important habitat corridors and wetland species. Habitat creation should respect existing priority grasslands, hydrology and long-term water-level maintenance, especially where a planned new settlement extends into open countryside. Watercourses may require separate metric category and permitting; the correct site survey is essential.
Waterbeach New Town green infrastructure and long-term stewardship
Waterbeach New Town includes former barracks land and countryside, historic landscape, mature hedges and woodlands, a proposed strategic green enhancement area and SuDS. Its approved outline phases have existing environmental conditions and different habitat obligations; a later 2026 draft S/WNT policy adds more detailed proposed nature network text but is not adopted. Green corridors must be planned and managed coherently across phases, not treated as an automatic BNG unit marketplace.
Northstowe, Cambourne and growth-edge habitat
Growth around Northstowe and Cambourne requires consideration of parks, trees, farmland and connected habitats as well as transport, drainage and construction disturbance. The district's NH/6 GI supports corridors and links, while NH/5 and NH/7 protect important existing ecological and woodland assets. A north-Cambridge postcode may be under South Cambridgeshire LPA even though the destination says Cambridge.
Local planning guidance
Protected sites, other consents and mitigation
South Cambridgeshire has priority habitats, ancient woods/veteran trees and legally protected species. Use the site location and actual effect pathways to establish whether protected-site, nutrient or visitor-pressure assessments apply. A site-specific planning/legal assessment is necessary for real designated sites or species impacts. Development affecting chalk streams/tributaries, fen-edge drainage and floodplain may need river/flood permits and separate watercourse-unit assessment. Habitat creation on existing valuable land must respect the gain hierarchy and protections in NH/5/NH/7; an apparent positive metric score cannot replace compensation or consent under other legislation.
A positive biodiversity metric result cannot automatically resolve the effect of development on a European site, SSSI, protected species or water quality. Habitats Regulations Assessment, project-specific mitigation and any required planning contributions are independent legal matters. Do not assume such contributions generate additional biodiversity units.
Local planning guidance
Current national BNG tests for South Cambridgeshire
Establish whether statutory BNG applies before selecting a metric or planning habitat delivery. The application date, site area and habitat baseline guide that assessment.
The statutory BNG condition and exemptions
For qualifying non-exempt development in England, the biodiversity gain condition normally requires at least 10% biodiversity gain, assessed with an eligible statutory metric. It was introduced for most major planning permissions from 12 February 2024 and relevant minor developments from 2 April 2024. It does not replace protected-species law, protected-site assessment or local adopted nature policies. For qualifying new applications made from 6 August 2026, a red-line development site of 0.2 hectares or less may be exempt where no on-site priority habitat is adversely affected.
The development site includes the whole red-line area, not just the building footprint. Other householder, de minimis, temporary, earlier permission and section 73 rules are separate. New self-build and custom-build applications no longer have the former automatic exemption after that date. Check the current legislation before stating an exemption.
The current metric, the Small Sites Metric and the gain hierarchy
The Statutory Biodiversity Metric was updated to version 1.1.0 on 3 November 2026. Earlier valid statutory versions are still permitted by government guidance; non-statutory Metric 4.0 is not suitable for a new mandatory calculation. Area habitat, hedgerow and watercourse units are separate classes. The Small Sites Metric is a simplified method only for eligible proposals, not a legal exemption from the requirement. For qualifying non-major applications from 6 August 2026, on-site creation or enhancement and registered off-site gains can be considered at the same preference level under the updated national hierarchy, with statutory credits last.
Major and earlier applications may differ. Avoiding harm to important habitat, species mitigation and designated-site safeguards remain relevant.
Approval and habitat delivery
The pre-development value, habitat plan, appropriate metric and any other applicable local validation information can be required at planning application stage. The final Biodiversity Gain Plan for a permission subject to the statutory condition is normally approved after permission but before development starts. Significant on-site gains and registered off-site gains generally require legally secured management for at least 30 years. A Habitat Management and Monitoring Plan should explain habitat targets, maintenance, monitoring, responsibilities and corrective actions. A proposed habitat bank is not necessarily a registered gain site with allocated units available for sale.
Confirm actual national gain-site registration, habitat type, trading and spatial rules, legal agreement, and allocation to the proposed permission. Statutory credits are a separate last-resort mechanism. Legally required protected-site mitigation cannot automatically be counted again as additional biodiversity gain.
For technical detail use ACP's BNG assessment service, statutory metric guidance, Small Sites Metric guidance and Biodiversity Gain Plan service.
Local planning guidance
Off-site units, legal costs and published local charges
The Greater Cambridge Planning Obligations SPD adopted April 2026 establishes the process for legally justified s106 obligations, including potential green infrastructure and stewardship measures, but does not establish a district-wide BNG unit tariff. Existing Waterbeach/New Town planning agreements may have site-specific habitat and monitoring provisions rather than universal per-dwelling costs.Request current council charges and a site-specific habitat-unit quotation. Keep UKHab survey, statutory metric, HMMP, legal agreement, habitat bank registration/allocations, offsite purchase and 30-year management as distinct cost headings. The 2022 SPD's 20% ambition is not a statutory offsite charge.
Separate consultancy surveys and reporting, statutory gain-site registration or allocation, legal agreements, 30-year habitat management and any Habitats Regulations visitor mitigation. These cost categories are not interchangeable. Prices and payment rules must be checked for the exact application date and authority, not assumed from a regional average.
For habitat delivery, see off-site biodiversity unit guidance and habitat management and monitoring.
Local planning guidance
South Cambridgeshire planning and BNG checklist
Use this checklist to gather the site information and decisions needed before an assessment or planning submission.
Local planning guidance
Questions about biodiversity net gain in South Cambridgeshire
These answers cover common planning, habitat and delivery questions for projects in South Cambridgeshire.
Is South Cambridgeshire under Cambridge City Council for BNG?
No. South Cambridgeshire District Council is a separate LPA, although it shares the planning service and an emerging joint Local Plan with Cambridge City. Apply South Cambridgeshire's adopted 2018 NH/4–NH/7 policies.
What adopted biodiversity policies apply in South Cambridgeshire?
The Local Plan adopted 27 September 2018 includes NH/4 Biodiversity, NH/5 Sites of Biodiversity or Geological Importance, NH/6 Green Infrastructure, and NH/7 Ancient Woodlands and Veteran Trees.
Is the Greater Cambridge 20% BNG target current adopted law?
No. The Proposed Submission plan consulted August–September 2026 contains emerging BG/BG proposing 20% for major development, but had not been adopted. The 2022 Biodiversity SPD explicitly describes 20% as an ambition rather than a mandatory adopted target.
Do Waterbeach New Town and Northstowe require a special planning check?
Yes. Waterbeach and Northstowe include adopted site/Area Action Plan and outline planning permissions with phased landscape, habitat and green infrastructure delivery. Check actual permission and parcel rather than imposing full new-town conditions on every village application.
Which Waterbeach New Town permissions are real?
Planning reference S/0559/17/OL for up to 6,500 homes was approved September 2019; S/2075/18/OL for up to 4,500 homes was approved December 2024. Later site phases have distinct matters and legal obligations. These are official council references, not ACP projects.
When was the Cambridgeshire and Peterborough LNRS published?
The Combined Authority's final LNRS was published on 23 December 2025 and covers South Cambridgeshire as part of the wider region. It includes a Local Habitat Map and priorities used when designing habitat measures.
Do all new small South Cambridgeshire sites require 10%?
No. Qualifying new planning applications made from 6 August 2026 on a red-line site of 0.2ha or less may be exempt where no onsite priority habitat is impacted. Other exemption/transition rules and ecology policies remain relevant.
What ecology evidence is needed for a district application?
Depending on proposal and habitats, applicants may need a UKHab baseline, condition and metric, protected species/trees/hedgerow reports and the relevant 2022 SPD submissions. Final statutory BGP generally approved before commencement, distinct from initial validation.
Can the LNRS map automatically raise a BNG unit score?
No. A measure must be mapped and genuinely match the actual habitat proposal and statutory metric guide, with realistic site condition and management. A shaded focus area is not a registered gain bank or guaranteed uplift.
Are BNG units sold at a fixed South Cambridgeshire price?
Request the current applicable council schedule and project-specific habitat quotation. Costs for ecology, legal/habitat management and any registered offsite units depend on actual unit type, site and allocation. The 2026 Planning Obligations SPD is not a fixed habitat unit tariff.
Project support
How ACP can help with your South Cambridgeshire project
ACP can help you plan the surveys, calculations and documents your site needs. We agree the scope around your proposal, its planning stage and the habitats affected.
Survey, design and planning support
- Habitat surveys and condition assessments.
- Statutory metric calculations and design options.
- BNG reports and planning submission support.
- Gain plans and habitat management documents.
Talk to ACP / Site enquiries
What does your site need next?
Tell us where the site is, what you plan to build and how far the application has progressed. We’ll use that context to discuss the surveys, calculations or plans your project needs.
What to have to handA red-line plan, an existing ecology report or a request from the council can help us scope the work. Start with whatever you already have.
Request a site-specific quotation
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South Cambridgeshire BNG
Sources and references
Reviewed 10 November 2026.
Official planning and nature recovery sources
- Adopted South Cambs Development Plan
- Proposed Submission Policy BG/BG
- Greater Cambridge Biodiversity SPD
- Cambridgeshire and Peterborough Local Nature Recovery Strategy
- Waterbeach New Town
- Greater Cambridge Existing Adopted Biodiversity Policies
- Greater Cambridge Green Blue Infrastructure Evidence
- Planning Obligations SPD
- National Planning Policy Framework: biodiversity policies N1 and N2