Slough BNG advice
Biodiversity Net Gain in Slough
Plan your Slough 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 Slough site.
Local requirements
Slough BNG requirements at a glance
| Check | Practical answer |
|---|---|
| Planning authority | Slough Borough Council — verify the actual parcel, any special planning jurisdiction and site type |
| Adopted development plan | Slough Local Plan 2004 retained saved policies, together with Slough Core Strategy 2006–2026 adopted December 2008 |
| Specific biodiversity policies | EN22 – Nature Conservation; EN23 – Local Nature Conservation Sites; EN3 – landscaping; Core Policy 8 – Sustainable Design and Construction |
| Emerging plan status | A new Slough Local Plan 2026–2046 is being prepared under the 2026 plan-making arrangements. The council's scoping consultation ran 13 July to 24 August 2026. The council published its Gateway 1 readiness self-assessment on 30 October 2026. These are not adoption, and the new plan's future policies cannot replace the existing saved 2004 and 2008 Core Strategy policies yet. Check current Planning Policy Council site for any new formal stage before publication. An old date of '2026' at the end of the Core Strategy period does not mean the plan stopped being operative without a lawful replacement. |
| LNRS | Berkshire Local Nature Recovery Strategy, published 7 October 2025; Royal Borough of Windsor and Maidenhead |
| 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 Slough
Confirm the planning authority
Slough Borough Council is the unitary planning authority. Berkshire provides the wider nature recovery context. Check the boundary near Buckinghamshire, Windsor and Maidenhead, or Hillingdon.
See BNG in Berkshire and the South East regional guide.
Use the adopted development plan
Slough Local Plan 2004 retained saved policies, together with Slough Core Strategy 2006–2026 adopted December 2008. Relevant policies include EN22 – Nature Conservation; EN23 – Local Nature Conservation Sites; EN3 – landscaping; Core Policy 8 – Sustainable Design and Construction.
The new Local Plan 2026–2046 reached Gateway 1 on 30 October 2026. It remains in preparation. The saved 2004 policies and adopted 2008 Core Strategy continue to inform applications.
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 Slough
Use the local nature recovery map
The published Berkshire Local Nature Recovery Strategy provides priorities and mapped opportunities for habitat recovery. It was published on 7 October 2025.
For Slough, consider the Slough Arm canal, Salt Hill Stream, Colne Valley connections and urban redevelopment land. Match the actual site location and proposed habitat to a relevant recovery measure.
Local habitats to consider in Slough
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 |
|---|---|
| Grand Union Canal Slough Arm | Canal edges, towpath scrub, riparian plants, bridges and watercourse unit requirements. Local validation requests river condition evidence for sites close to canals. |
| Salt Hill Stream and Salt Hill Park | Council's restoration proposals and local drainage/green networks. Separate actual completed works from future proposed stream daylighting and wetland project phases. |
| Colne Valley and eastern Slough fringe | River/woodland connectivity and wildlife habitat near neighbouring Buckinghamshire/Hillingdon boundaries; relevant SPA/SAC effects depend on site. |
| Slough Trading Estate, town-centre regeneration and urban trees | Brownfield parcels may contain established trees, scrub, grassland and priority open mosaic habitat; zero ecological baseline cannot be assumed. |
Plan protected-site and species evidence
Assess woodland, river and protected-species pathways relevant to the proposal. For sites potentially affecting Burnham Beeches SAC, use the council’s habitat-survey guidance and the actual development effects.
The Slough Arm and urban drainage network can trigger watercourse evidence. Survey the watercourse type and nearby habitats early, including trees or open mosaic habitat on previously developed land.
Local planning context
Slough’s watercourse evidence requirements
For applicable applications, Slough requests a Biodiversity Statement, metric spreadsheet and baseline and proposed habitat plans. Its validation guidance includes adjacent watercourse lengths where the red line contains land within 10 metres of a canal or river, or 5 metres of a ditch.
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 Slough, survey the Slough Arm canal, Salt Hill Stream, Colne Valley connections and urban redevelopment land 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.
| Design decision | Evidence to bring together |
|---|---|
| Confirm the baseline | Map the habitats, trees and relevant watercourses before fixing the footprint. Include condition and any protected-species evidence. |
| Compare realistic options | Test retention, enhancement and habitat creation against the layout, drainage, access and long-term management. |
| Check the delivery route | Calculate each relevant unit category. Record legal security, management responsibilities and any registered off-site allocation. |
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
Slough Trading Estate and town-centre plots can contain established vegetation and habitat mosaics. Inspect the baseline before fixing the layout. Along Salt Hill Stream or the canal, connect ecology with drainage, access and the management of green corridors.
A practical Slough planning example
Illustration: a commercial redevelopment lies beside the Slough Arm and removes grassland and trees. Check the red-line distance to the canal, prepare the watercourse evidence and compare retained vegetation with proposed gains. Assess each relevant metric module and its management needs.
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 Berkshire 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 Slough 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.
Include any River Condition Assessment, habitat or species surveys and editable metric work required for the application. Price legal arrangements, management and off-site units separately where needed.
Planning evidence
Slough 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 Slough planning and evidence route
Use these questions to organise the planning, habitat and delivery information for your site.
Which authority and adopted plan apply?
Slough Borough Council is the unitary planning authority. Berkshire provides the wider nature recovery context. Check the boundary near Buckinghamshire, Windsor and Maidenhead, or Hillingdon.
Slough Local Plan 2004 retained saved policies, together with Slough Core Strategy 2006–2026 adopted December 2008. Relevant policies include EN22 – Nature Conservation; EN23 – Local Nature Conservation Sites; EN3 – landscaping; Core Policy 8 – Sustainable Design and Construction.
How should I treat emerging policies?
The new Local Plan 2026–2046 reached Gateway 1 on 30 October 2026. It remains in preparation. The saved 2004 policies and adopted 2008 Core Strategy continue to inform applications.
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 Berkshire 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?
Assess woodland, river and protected-species pathways relevant to the proposal. For sites potentially affecting Burnham Beeches SAC, use the council’s habitat-survey guidance and the actual development effects.
The Slough Arm and urban drainage network can trigger watercourse evidence. Survey the watercourse type and nearby habitats early, including trees or open mosaic habitat on previously developed land.
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 Slough project
ACP can help scope the habitat surveys, metric calculations and planning reports needed for your Slough proposal. Early advice is most useful while the layout can still change.
We can consider the Slough Arm canal, Salt Hill Stream, Colne Valley connections and urban redevelopment land alongside the site’s planning route and proposed works.
Local planning questions
Frequently asked questions about BNG in Slough
For a site-specific question, discuss your project with ACP.
What is Slough's current planning policy for biodiversity?
Slough Borough Council uses its saved 2004 nature policies, including EN22/EN23, and the adopted 2008 Core Strategy, alongside national statutory BNG. The new 2026–2046 Plan remains emerging.
Do I need a River Condition Assessment beside the Slough Arm?
For an applicable proposal with land within 10m of a canal/river or 5m of a ditch, Slough's BNG local validation guidance requests the relevant watercourse baseline and River Condition Assessment. It is site/category-dependent, not proof of exemption.
Is the new 2026–2046 Slough Local Plan adopted?
No. The council's Gateway 1 readiness announcement on 30 October 2026 begins a plan-making stage. The 2004 saved and 2008 adopted framework remains relevant until lawful replacement.
How is Salt Hill Stream relevant to local habitat planning?
The council’s Salt Hill Stream programme shows opportunities for urban water and habitat improvement. If an off-site purchase is proposed, obtain separate evidence of registration, suitable units and legal allocation to the development.
Is 10% biodiversity net gain compulsory for every Slough project?
No. Eligible applications normally require at least 10%, but the 2026 national exemptions, application date, development type and priority habitats can change the position. Other ecological and planning policies can still apply.
Do I need an ecology survey if my application is exempt?
Not automatically for every site, but an exemption from mandatory BNG does not remove protected species, designated site, tree or local ecological planning duties. The need for evidence depends on what the proposed work may affect.
Does a published local nature recovery map itself grant permission?
No. The Berkshire Local Nature Recovery Strategy helps target recovery priorities. It does not prove a habitat exists on a parcel, award metric uplift automatically or replace planning permission. Compare the map with actual habitat surveys and the mapped measure.
Can I buy off-site units instead of avoiding habitat loss?
The applicable gain hierarchy and trading rules still matter. Registered off-site units can be part of a lawful delivery strategy, but their type, legal securing, allocation and availability must be checked. Statutory credits are a separate last-resort route.
When is a final Biodiversity Gain Plan approved?
For applicable ordinary planning permissions, approval normally follows permission and precedes the start of development. Planning applications still need proportionate evidence of deliverability; the local authority's current validation guidance must be checked.
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
Start with the information you have. We ask for your email, site location and enquiry, with a telephone number at the final step.
We use your details to respond to your enquiry. Read our Privacy Policy.
Slough BNG
Sources and references
Reviewed 10 November 2026.
Official planning and nature recovery sources
- Current GOV.UK exemption guidance
- View the official local nature recovery materials
- Appropriate assessment guidance
- Slough BNG local validation
- Slough adopted and saved planning policy gateway
- Slough 2004 saved policies
- Slough core strategy planning policies
- New Slough Local Plan overview
- Slough new plan timetable
- GOV.UK's BNG guidance
- statutory biodiversity metric downloads
- National Planning Policy Framework: biodiversity policies N1 and N2