Crawley BNG advice
Biodiversity Net Gain in Crawley
Plan your Crawley 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 Crawley site.
Local requirements
Crawley BNG requirements at a glance
| Check | Practical answer |
|---|---|
| Planning authority | Crawley Borough Council — verify the actual parcel, any special planning jurisdiction and site type |
| Adopted development plan | Crawley Borough Local Plan 2023–2040 adopted 16 October 2024 |
| Specific biodiversity policies | GI3 – Biodiversity and Net Gain; GI2 – Biodiversity Sites; GI1 – Green Infrastructure |
| Emerging plan status | The 2024 adopted Local Plan remains the operative borough-wide policy framework. Do not refer to the former 2015 ENV2 as if it were the current biodiversity policy. No adopted replacement after October 2024 was identified. |
| LNRS | West Sussex Local Nature Recovery Strategy, Published 24 June 2026; West Sussex County Council |
| Statutory BNG | Normally at least 10% for eligible applications; exemption and application date checks are essential |
| Protected sites | Independent Habitats Regulations or protected-species evidence where a credible impact pathway exists |
Planning authority and policy
Local planning requirements for Crawley
Confirm the planning authority
Crawley Borough Council determines ordinary borough applications. West Sussex County Council handles county matters such as minerals and waste. Check the site boundary, particularly near adjoining council areas.
See BNG in West Sussex and the South East regional guide.
Use the adopted development plan
Crawley Borough Local Plan 2023–2040 adopted 16 October 2024. Relevant policies include GI3 – Biodiversity and Net Gain; GI2 – Biodiversity Sites; GI1 – Green Infrastructure.
The Local Plan adopted in October 2024 is the current borough framework. Use GI3 for biodiversity net gain, with GI1 and GI2 for green infrastructure and biodiversity sites.
Establish the gain target
Eligible development normally needs at least 10% statutory gain. Establish the applicable target using current national policy, any relevant site-allocation policy and existing permission.
Plan habitat retention, suitable enhancement and long-term management alongside the site layout. Check the national biodiversity planning policies when establishing obligations.
Check dates and exemptions
For applications from 6 August 2026, sites up to 0.2 hectares may qualify for an exemption if no onsite priority habitat is adversely affected.
Householder, de minimis, temporary-development and transitional rules have their own conditions. Record the application date, site area and supporting habitat evidence.
Use the BNG exemptions guide to identify the relevant route.
Nature recovery and local geography
Local habitats and nature recovery in Crawley
Use the local nature recovery map
The published West Sussex Local Nature Recovery Strategy provides priorities and mapped opportunities for habitat recovery. It was published on 24 June 2026.
For Crawley, consider Tilgate woodland edges, Ifield Brook, Manor Royal sites and neighbourhood greenways. Match the actual site location and proposed habitat to a relevant recovery measure.
Local habitats to consider in Crawley
Use the landscape context to scope the survey, then record the habitats actually present within the site boundary.
| Local setting | Potential habitat or evidence issue |
|---|---|
| Tilgate and woodland edges | Woodland, parkland, ponds and tree networks, with potential ancient-woodland protection where mapped. |
| Ifield Brook and river corridors | Riparian habitats and wetland edge restoration, with drainage or watercourse studies where relevant. |
| Manor Royal industrial and commercial land | Brownfield habitat mosaics, amenity grassland, hedgerows and potential green-roof or SuDS upgrades. |
| Urban neighbourhoods and greenways | Street trees, gardens, hedgerows and connected parks remain relevant even in compact urban developments. |
Plan protected-site and species evidence
Scope woodland, tree, pond and protected-species evidence around the habitats affected. Ifield Brook and other river corridors may require separate watercourse or drainage assessment.
The council confirms that water neutrality is no longer a general requirement in the Sussex North Water Supply Zone. Continue to assess the proposal’s actual drainage, water quality and protected-site effects.
Planning and delivery
Preparing evidence and delivering biodiversity gain
Prepare the habitat baseline and metric
Start with the site’s habitat baseline and condition. Use the appropriate statutory metric; the Small Sites Metric is suitable only where its eligibility conditions are met.
In Crawley, survey Tilgate woodland edges, Ifield Brook, Manor Royal sites and neighbourhood greenways where these occur within or affect the proposal. Record the actual habitat condition and relevant watercourse evidence.
See BNG assessments and habitat surveys, habitat condition assessment and Small Sites Metric assessments.
Prepare the planning submission
Confirm the planning authority, application date, relevant policies and whether statutory BNG applies. Then agree a proportionate submission scope with the council.
- An applicability or exemption explanation supported by site evidence.
- The red-line boundary, baseline habitat plan and metric where required.
- Proposed layout, retained habitats and feasible habitat gains.
- Any protected-species, watercourse, drainage or Habitats Regulations evidence.
Test the layout against local habitat constraints
Retain sensitive habitats and useful connections where possible. Use these questions to compare realistic layout and habitat options.
| Local setting to test | Useful design and survey question |
|---|---|
| Tilgate and woodland edges | Can the proposal avoid impacts? Woodland, parkland, ponds and tree networks, with potential ancient-woodland protection where mapped. |
| Ifield Brook and river corridors | What would retaining or improving connectivity involve? Riparian habitats and wetland edge restoration, with drainage or watercourse studies where relevant. |
| Manor Royal industrial and commercial land | Do the existing habitats or species interests restrict the proposed gain type? Brownfield habitat mosaics, amenity grassland, hedgerows and potential green-roof or SuDS upgrades. |
| Urban neighbourhoods and greenways | Can the layout integrate useful green infrastructure? Street trees, gardens, hedgerows and connected parks remain relevant even in compact urban developments. |
Choose habitats suited to the site and its long-term management. Match nature recovery measures to the published LNRS map, then calculate all relevant unit categories.
Development and regeneration context
Manor Royal commercial land and town-centre redevelopment can contain trees, grassland, hedges or brownfield habitat. Survey these before fixing the footprint. Green roofs, rain gardens and connected boundaries may offer useful habitat options where their design and management are feasible.
A practical Crawley planning example
Illustration: a Manor Royal redevelopment retains mature boundary trees but removes grassland and scrub. Record the baseline, assess condition and compare the proposed roof and landscape habitats. Check whether watercourse or protected-species work is needed before relying on the resulting metric calculation.
Plan off-site delivery and long-term management
Calculate the genuine shortfall before committing to off-site units. Apply the relevant gain hierarchy, habitat trading rules and location requirements to the proposed delivery route.
Use the West Sussex Local Nature Recovery Strategy to explore habitat opportunities. Confirm registration, suitable units and current availability directly with the proposed supplier.
Read about off-site biodiversity units, Biodiversity Gain Plans and Habitat Management and Monitoring Plans.
Council and delivery costs
What should your Crawley BNG budget cover?
Budget for habitat surveys, metric calculations, planning reports and any gain-plan or management work. The scope depends on the site, habitat types and planning stage.
Allow for tree and protected-species work where relevant, plus any roof, drainage or landscape design needed to make the habitat proposal deliverable. Agree survey timing early for woodland-edge sites.
Planning evidence
Crawley BNG preparation checklist
Free resource: Use the local BNG planning evidence route worksheet. It provides a light, accessible reference to official documents and the difference between BNG and separate ecological duties.
Planning evidence worksheet
Find your Crawley planning and evidence route
Use these questions to organise the planning, habitat and delivery information for your site.
Which authority and adopted plan apply?
Crawley Borough Council determines ordinary borough applications. West Sussex County Council handles county matters such as minerals and waste. Check the site boundary, particularly near adjoining council areas.
Crawley Borough Local Plan 2023–2040 adopted 16 October 2024. Relevant policies include GI3 – Biodiversity and Net Gain; GI2 – Biodiversity Sites; GI1 – Green Infrastructure.
How should I treat emerging policies?
The Local Plan adopted in October 2024 is the current borough framework. Use GI3 for biodiversity net gain, with GI1 and GI2 for green infrastructure and biodiversity sites.
Establish the applicable gain target using current national policy, any relevant up-to-date site-allocation policy and existing permission.
How do I use the nature recovery map?
Match the actual site and proposed habitat to a relevant measure in the West Sussex Local Nature Recovery Strategy. Record the map and survey evidence supporting the metric entry.
Could an exemption apply?
For applications from 6 August 2026, sites up to 0.2 hectares may qualify if no onsite priority habitat is adversely affected. Other exemptions and transitional provisions have separate conditions. Record the development type, date, red-line area and habitat evidence.
Which separate ecological issues matter?
Scope woodland, tree, pond and protected-species evidence around the habitats affected. Ifield Brook and other river corridors may require separate watercourse or drainage assessment.
The council confirms that water neutrality is no longer a general requirement in the Sussex North Water Supply Zone. Continue to assess the proposal’s actual drainage, water quality and protected-site effects.
When is the final gain plan needed?
For eligible ordinary applications, the statutory Biodiversity Gain Plan is normally approved after permission and before development starts. Agree earlier planning evidence with the authority and identify feasible management and any off-site delivery route.
Details to gather before an enquiry
Project support
How ACP can help with your Crawley project
ACP can help scope the habitat surveys, metric calculations and planning reports needed for your Crawley proposal. Early advice is most useful while the layout can still change.
We can consider Tilgate woodland edges, Ifield Brook, Manor Royal sites and neighbourhood greenways alongside the site’s planning route and proposed works.
Local planning questions
Frequently asked questions about BNG in Crawley
For a site-specific question, discuss your project with ACP.
Is Crawley's adopted 2015 ENV2 still the main policy?
No. The Crawley Borough Local Plan 2023–2040 was adopted on 16 October 2024. The key current biodiversity policy is GI3, supported by GI1 and GI2.
Does GI3 require at least 10% BNG?
GI3 includes a minimum 10% target for qualifying development. Apply current national rules, including the relevant gain hierarchy and exemptions, when deciding how the scheme will deliver its gains.
Is Sussex North water neutrality still automatic in Crawley?
The council says Natural England changed its position and water neutrality is no longer required across the zone. Recheck current council advice for any individual drainage or protected-site issue.
Can Manor Royal brownfield development have BNG responsibilities?
Yes. The fact that land is previously developed does not establish an exemption or zero habitat baseline. Check the red line, qualifying application and actual vegetation.
Which habitat surveys might a site in Crawley need?
Scope the assessment around the habitats and proposed effects. In Crawley, relevant settings include Tilgate woodland edges, Ifield Brook, Manor Royal sites and neighbourhood greenways. The red-line plan, habitat condition and any water or species pathways determine the survey work.
How should I use the local nature recovery map?
Use the published map to match the site and proposed habitat to a recovery measure. Survey evidence and feasible management then support the design and metric calculation. Confirm the planning authority separately, including any National Park jurisdiction.
How do BNG exemptions work for a small Crawley development?
Since 6 August 2026, a red-line site of 0.2 hectares or less may qualify for exemption if the statutory conditions are satisfied, including no adverse effect on onsite priority habitat. Other ecological duties may remain.
How can habitat retention help with BNG in Crawley?
Retain valuable habitats and connections where feasible, and test how the layout affects them. If a genuine shortfall remains, use the applicable gain hierarchy and habitat trading rules to select a suitable delivery route.
When is the final gain plan needed in Crawley?
For eligible ordinary applications the final statutory Biodiversity Gain Plan normally needs approval after planning permission and before commencement. Check what the council asks for during validation and whether a management plan is needed.
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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Crawley BNG
Sources and references
Reviewed 10 November 2026.
Official planning and nature recovery sources
- Current GOV.UK exemption guidance
- West Sussex LNRS
- Appropriate assessment guidance
- Sussex North water neutrality update
- Adopted GI3 policy and plan PDF
- Crawley 2023–25 Biodiversity Duty report
- GOV.UK's BNG guidance
- statutory biodiversity metric downloads
- National Planning Policy Framework: biodiversity policies N1 and N2