Biodiversity Net Gain (BNG) Surveys & Consultants in London

The phrase “Biodiversity Net Gain London map” refers to spatial information and mapping tools that depict habitat networks, green infrastructure corridors, Local Nature Recovery Strategies (LNRS) and priority areas for nature enhancement across London. For example, the Greater London Authority is preparing the London LNRS and has published a map of priority habitat areas.

In practice, developers or consultants may use the London map to:

• Identify existing habitat networks or Sites of Importance for Nature Conservation (SINCs) within or around their site.
• Demonstrate connectivity and strategic value when applying the biodiversity metric (which takes account of strategic location).
• Tailor habitat enhancement proposals so they support the local nature recovery network and thereby strengthen the metric uplift and ecological value.

In short, the mapping helps integrate the BNG strategy into the wider London ecological context and supports robustness of planning submissions

The term “biodiversity net gain London 2021” often references policy frameworks such as The London Plan 2021 and associated guidance documents which embed biodiversity, urban greening and net-gain expectations in the strategic planning of London.

The London Plan 2021 sets out high-level policies for biodiversity and access to nature (for example Policy 7.19 in the earlier version).  When combined with national BNG legislation, this reinforces expectations that London developments must consider biodiversity from the outset through layout, design, materials, landscaping, habitat connectivity and long-term management. Use of this policy framework means that your development must go beyond simply meeting the 10% net gain you must also align with local expectations for green infrastructure, natural capital and ecosystem services. By working with expert BNG consultants, you can ensure your project meets both the national statutory requirement and London-specific planning policy.

Examples of biodiversity net gain help demonstrate how developments have delivered measurable biodiversity improvements, using designs, habitat creation or enhancement, green infrastructure, re-wilding or off-site compensation.

Good BNG examples may include:

• A residential development in London where brown-field land has been re-designed to include green roofs, wetlands, tree planting and native meadow to increase habitat distinctiveness and connectivity.
• A commercial redevelopment that enhances onsite habitats and contributes to a local habitat bank, achieving off-site net gain where space on-site is limited.
• An urban infill project in London working with a BNG consultant to apply the metric, secure S106 for habitat maintenance, and incorporating ecosystem services (e.g., storm-water attenuation, improved air-quality) into the net gain narrative.

These examples illustrate how combining strong ecological design, metric application and legal/management mechanisms delivers credible net gain outcomes.

The national BNG framework includes a number of exemptions and transitional arrangements. Understanding these is crucial when planning a development in London, to avoid being caught unaware by planning conditions.

According to the national guidance:

• Some developments may be exempt from the biodiversity gain condition, such as certain permitted-development schemes, applications made prior to the mandatory date, or developments affecting irreplaceable habitat (which cannot rely on the 10% net gain but may require other mitigation).
• For London boroughs, you must check the local planning authority’s validation list. For example, Hammersmith & Fulham require the 10% net gain for major and minor schemes, so exemptions are limited.
• Even where exempt, many LPAs will still encourage biodiversity improvements as part of the application review. Given the strategic importance of green infrastructure in London, relying on exemption alone may delay or complicate planning consent.

In short: don’t assume exemption check with your LPA and seek professional BNG consultancy to assess your situation early.

A biodiversity net gain planning condition (or obligation) is the mechanism by which your development is legally bound to deliver the uplift in biodiversity value, maintain it and secure monitoring.

For most developments in London:

• Once planning permission is granted, a biodiversity gain plan must be submitted and approved before any development starts.
• The planning condition will typically state: “No development shall commence until a biodiversity gain plan has been approved by the LPA and the biodiversity net gain condition (10% uplift) is secured for at least 30 years.” Many London boroughs reference the 30-year maintenance period.
• The condition is secured via a Section 106 agreement (or equivalent legal covenant) that binds the developer (and successors) to maintain the habitats, deliver monitoring and report compliance. Failure to comply may result in enforcement or breach of obligation.
• A specialist BNG consultant (such as ACP) will prepare the plan, coordinate legal drafting, satisfy the metric and liaise with the LPA’s ecology team to discharge the condition.

A biodiversity net gain plan is the document that outlines how your development will deliver the required uplift in biodiversity value, including habitat enhancement, management, monitoring and responsibilities.

The nationwide template for a biodiversity gain plan is published by the Department for Environment, Food & Rural Affairs (DEFRA).  For London-based developments, the plan will typically include:

• Baseline habitat survey and metric calculation, identifying existing biodiversity units and condition.
• Post-development habitat proposals showing how habitat creation/enhancement achieves the uplift.
• Proposals for on-site vs off-site habitat, and justification for any off-site or habitat banking approach.
• Management and monitoring schedule (e.g., years 1, 5, 10, 20, 30) with responsibility clearly assigned (owner/developer/management company).
• Legal mechanism and long-term funding source to secure habitat delivery and maintenance (often via S106).
• Reporting regime and performance indicators for biodiversity units, including corrective actions if habitat fails to deliver.
• Integration with green infrastructure, ecosystem services and natural capital where appropriate, especially for urban London sites.

Engaging ACP as your BNG consultant means that we will prepare the biodiversity gain plan, tailor it for your London site context, and ensure it meets both national guidance and the local planning authority’s expectations.

Developers often ask how biodiversity net gain regulations interact with London’s planning context.

BNG regulations set the statutory 10% uplift and long-term management requirement. In London, these operate alongside borough-level policy and validation needs. Your planning case officer will expect a clear metric output, a deliverable habitat approach and evidence of environmental compliance over 30 years. ACP coordinates ecology, legal security (e.g., S106) and monitoring so your scheme satisfies national regulations and the expectations of your borough.

Clients search for biodiversity net gain planning practice guidance to understand exactly what to submit.

Yes. National planning practice guidance explains how to evidence BNG, while boroughs set local validation lists. We align your ecological assessments, Biodiversity Gain Plan, drawings and management schedules with both the national planning practice guidance and the London Plan/borough guidance so your application is registered first time and progresses smoothly.

Many applicants are unsure whether planning applications need separate ecological assessments or broader impact assessments.

Most planning applications benefit from early ecological assessments to scope habitats and risks. Where proportionate, we also prepare impact assessments that link design decisions to measurable BNG outcomes. This avoids late redesign, streamlines validation and provides a transparent pathway from baseline to net-gain delivery.

Delivering BNG in dense areas like London raises questions about habitat management plans and biodiversity action plans that support urban biodiversity.

A robust habitat management plan specifies objectives, methods, triggers and monitoring for 30 years. We pair this with site-scale biodiversity action plans that translate borough and London priorities into actions on your land (e.g., targeted planting, sustainable irrigation, winter structure for invertebrates). This approach also supports ecological restoration where degraded land can be enhanced over time.

Clients often wonder whether sustainability consultants are enough, or whether a specialist ecological consultancy is required for environmental compliance and site assessments.

For BNG you’ll typically require a dedicated ecological consultancy to complete ecological site assessments, baseline surveys and the biodiversity metric. We integrate with your sustainability consultants to keep carbon, drainage and green infrastructure decisions aligned with BNG. ACP ensures your documentation meets environmental compliance tests while remaining practical for contractors.

A common concern is how development will support wildlife conservation and credible ecological impact mitigation.

ACP designs mitigation that first avoids impacts, then minimises and restores, reserving off-site measures as a last resort. We secure ecological impact mitigation through clear drawings, specifications and management tasks ensuring wildlife conservation outcomes are measurable and reported over the life of the project.

Clients sometimes ask what biodiversity metrics actually do.

Biodiversity metrics quantify changes in habitat type, condition and strategic value. In London this helps justify site assessments, on-site habitat enhancement and any off-site solutions. ACP calculates, audits and explains metric outputs so design teams and planning officers can trace every assumption.

If you’re seeking specialist delivery, you’ll want a team focused on London.

Speak to ACP. We deliver end-to-end support for Biodiversity Net Gain (BNG) surveys and consultants in BNG in London (Region Hub) from scoping and surveys to metric work, legal security and monitoring keeping your programme, budget and obligations on track.