What does a BNG survey in the City of London involve?

A BNG survey in the City of London typically begins with a desk-based review of habitats, species records and site constraints, followed by a site visit to verify baseline conditions. The survey data is then used to map habitats, calculate baseline biodiversity units using the statutory biodiversity metric, identify on-site or off-site habitat enhancement opportunities, and support the preparation of a Biodiversity Gain Plan and Habitat Management and Monitoring Plan for planning submission.

When is BNG required for City of London planning applications?

Mandatory Biodiversity Net Gain applies to most qualifying developments in England, subject to exemptions. Within the City of London, applicants should also consider the City of London Corporation's Planning for Sustainability SPD, biodiversity policy expectations and local validation requirements when preparing a planning application.

How does GIS and location intelligence support the BNG process in the City of London?

GIS and location intelligence support BNG by allowing habitats, trees, green roofs, connectivity corridors and ecological opportunity areas to be mapped and analysed spatially. In a dense urban environment such as the City of London, this helps project teams understand site constraints, model habitat enhancement scenarios and present biodiversity gain proposals clearly to the local planning authority.

Can BNG be delivered off-site for City of London developments?

Yes. Where on-site opportunities are constrained, off-site biodiversity units or other compliant delivery routes may be used, provided the gain is measurable, additional, legally secured and maintained for the required period. This is often an important option for highly constrained City of London sites.

How is mapping used in biodiversity net gain assessments in the City of London?

Mapping is used to identify existing habitats, green roofs, street trees, podium gardens and potential ecological connectivity features across the City of London's dense built environment. Combined with GIS analysis, this helps produce accurate, auditable and planning-ready BNG assessments.

What role does location intelligence play in urban planning and biodiversity mapping?

Location intelligence combines mapping, spatial data analysis and environmental information to identify biodiversity constraints and opportunities within urban development sites. For City of London projects, this can help optimise habitat design, improve connectivity and support more robust ecological decision-making.

How do wildlife conservation initiatives and local partnerships relate to BNG in the City of London?

Regional conservation initiatives, biodiversity partnerships and ecological data providers help shape the wider biodiversity context within which BNG is delivered. Referring to these priorities can help ensure that proposed biodiversity gains contribute meaningfully to local and London-wide ecological networks.

What is new for BNG in the City of London since the Environment Act 2021?

Since the Environment Act 2021 introduced the mandatory BNG framework, City of London developments have increasingly needed to provide clearer biodiversity evidence, metric calculations and long-term management commitments. The combination of national legislation and local planning expectations means early ecological input is now more important than ever.

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At ACP Consultants we specialise in delivering BNG in City of London surveys and consultancy services tailored to the urban environment of central London.

AWhether you require a BNG survey in City of London for a planning application or need experienced BNG Consultants in City of London to steer your development through assessment, metric calculation and compliance, our team provides end-to-end support. We understand London’s unique ecology and planning context from roof-top green infrastructure to land-locked brownfield sites, and we guide you through the process of achieving measurable and defendable biodiversity net gain while navigating local policy and the statutory metric.

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BNG in City of London

What is Biodiversity Net Gain (BNG) in City of London?

Biodiversity Net Gain (BNG) means ensuring that a development leaves nature in a better state than before. Under the national framework, developments must secure at least a 10% biodiversity uplift, using the latest DEFRA Statutory Biodiversity Metric 4.0 measurement tool.

In the highly urbanised environment of the City of London, achieving BNG in City of London requires careful assessment of constrained habitats, built environment constraints and the opportunities for habitat creation via green roofs, walls, SuDS and podium gardens. The dense grid and high-value land mean developers need specialist advising early on to integrate BNG effectively.

The focus of a BNG survey in City of London is to baseline existing biodiversity value, calculate required uplift, identify on-site or off-site solutions and produce a report and Habitat Management and Monitoring Plan (HMMP) for submission to the local planning authority.

Given the City’s role in finance, business and heritage, consultation and documentation are critical — and our role as leading BNG Consultants in City of London is to ensure your metrics, data and legal obligations align.

Environment Act 2021 and Local BNG Policy in BNG in City of London

The national legislative underpinning for biodiversity net gain is anchored in the Environment Act 2021, which inserts Schedule 7A into the Town and Country Planning Act 1990.

For the City of London, the relevant local policy is set out in the Planning for Sustainability SPD for the City of London Corporation which explicitly includes “Biodiversity Net Gain” in Section 7 — Urban Greening and Biodiversity.

In parallel the City’s own Biodiversity Action Plan (2021-26) recognises BNG as part of its strategy for the built environment.

As a result, any planning application in the City of London region must consider BNG in its design and submission and developers are required to supply a Biodiversity Gain Plan alongside other application documentation. The early engagement of BNG consultants and surveyors is therefore essential to meet validation requirements and avoid delay.

Using DEFRA’s Statutory Biodiversity Metric 4.0

Our work with the metric ensures your submission is robust. The metric calculates pre- and post-development biodiversity value, monitors habitat condition and longevity and determines net gain. It also provides flexibility for off-site credits or habitat banks where on-site gain is constrained.

In the built context of the City of London you’ll often need to consider rooftop green infrastructure, façade greening or high-level podium planting as habitat creation. The metric requires habitat management for a minimum 30 years or equivalent guarantee, often via S106 agreements or conservation covenants.

Our BNG Consultants in City of London assist in: collecting the baseline ecological survey data; testing design iterations for biodiversity uplift; modelling different scenarios; producing the Biodiversity Gain Plan; liaising with the LPA; and preparing the HMMP with monitoring schedules.

Early engagement means design teams can treat biodiversity as an integral element, avoiding last-minute remediation or cost overruns.

ACP’s Role and BNG Services in BNG in City of London

At ACP Consultants we combine technical rigour with practical delivery. As experienced BNG Consultants in City of London we provide the following services: ecological baseline surveys, metric calculations, impact assessments, habitat creation & enhancement design, Biodiversity Gain Plans, Habitat Management & Monitoring Plans, off-site credit modelling and LPA liaison.

Working with clients from early feasibility through to monitoring we integrate GIS and spatial analysis workflows, leveraging British National Grid referencing and location intelligence to map existing habitats, identify priority species and urban nature links.

Our team specialises in urban planning applications London-wide, including major developments, refurbishment schemes and smaller conversions. We are adept at navigating the City of London’s built fabric and recognising opportunities – whether green roofs, pocket parks, tree planting or underground services.

Speak to a BNG Consultant in City of London

Connect directly with our experienced BNG Consultants in City of London for expert guidance on biodiversity assessments, habitat management planning and local authority compliance.

BNG Reports and Surveys We Offer

ACP Consultants provides a full suite of Biodiversity Net Gain (BNG) reports, surveys and planning documents tailored to developments within the City of London Corporation area. Our consultants ensure every submission meets DEFRA’s Statutory Biodiversity Metric 4.0 and the City’s Planning for Sustainability SPD requirements.

BNG Survey and Biodiversity Net Gain Surveys in City of London

Our BNG surveys in City of London establish the baseline biodiversity value for your site using a combination of ecological fieldwork, habitat mapping and GIS analysis. These biodiversity net gain surveys support both major and minor planning applications, ensuring compliance with the Environment Act 2021 and the City of London’s biodiversity policy.
We record habitat condition and distinctiveness using British National Grid coordinates, helping planners visualise how proposed designs deliver measurable biodiversity uplift.

BNG Assessments and Biodiversity Net Gain Assessments for City of London Projects

A BNG assessment in City of London quantifies the difference between the pre-development baseline and the proposed post-development habitats. ACP Consultants produce detailed biodiversity net gain assessments to accompany full planning applications, ensuring your project achieves the required minimum 10% net gain.
Each assessment follows the DEFRA Metric 4.0 methodology and references the City Corporation’s validation checklist, ensuring that your biodiversity documentation passes LPA review without delay.

BNG Action Plan for City of London Developments

A BNG Action Plan sets out the specific actions required to secure biodiversity improvements across your development in the City of London. This document details timelines, responsibilities, and on-site or off-site enhancement opportunities consistent with the London Biodiversity Action Plan (2021–26).
It acts as a bridge between ecological survey results and implementation, supporting contractors and design teams in meeting biodiversity performance targets.

Biodiversity Gain Plan (BGP) for City of London Planning Applications

All major schemes within the City of London are now required to submit a Biodiversity Gain Plan (BGP) before development begins. ACP Consultants prepares compliant BNG Gain Plans outlining how the project achieves measurable net gain under Schedule 7A of the Town and Country Planning Act 1990.
Our plans clearly identify habitat creation, long-term management and monitoring commitments, giving planning officers the assurance that your proposals meet statutory biodiversity obligations.

Habitat Management and Monitoring Plan (HMMP) for City of London Schemes

Our Habitat Management and Monitoring Plans (HMMPs) are tailored to the compact and high-density nature of City of London developments. These plans set out long-term maintenance and monitoring strategies for green roofs, podium planting, street trees and ecological features, ensuring the 30-year management requirement is met.
ACP Consultants liaises directly with the City of London Corporation to ensure that each HMMP aligns with local planning conditions, Section 106 agreements or conservation covenants.

BNG Report and Biodiversity Net Gain Report for City of London Planning Compliance

A comprehensive BNG Report summarises your survey results, metric calculations and biodiversity enhancement proposals. Each biodiversity net gain report prepared by ACP Consultants includes maps, species lists, habitat condition data and DEFRA Metric outputs suitable for planning submission.
Our reports are formatted to the City of London’s validation standards, ensuring compatibility with electronic planning portals and meeting all requirements for urban BNG submissions.

BNG Exemption Statement for City of London Developments

Certain small-scale or temporary projects within the City of London may qualify for exemption from mandatory BNG requirements. ACP Consultants can prepare a formal BNG Exemption Statement to justify exemption under the DEFRA guidance, supported by habitat evidence and policy references.
This statement ensures clarity for planners and developers, preventing unnecessary delays or misinterpretation during validation.

BNG Baseline Survey and Biodiversity Net Gain Baseline Reports

Our BNG Baseline Surveys in City of London provide the foundation for all future biodiversity calculations. Using a combination of desk-based ecological data, on-site surveys and spatial analysis, we determine existing habitat types and their ecological value.
Baseline results are presented in a concise Biodiversity Net Gain Baseline Report, ensuring the City of London Corporation has clear, auditable evidence to review when assessing your planning application.

mandatory BNG requirements. ACP Consultants can prepare a formal BNG Exemption Statement to justify exemption under the DEFRA guidance, supported by habitat evidence and policy references.
This statement ensures clarity for planners and developers, preventing unnecessary delays or misinterpretation during validation.

Regional Expertise Across London

ACP Consultants provides comprehensive biodiversity net gain support across every borough of London. Our consultants are locally positioned and familiar with each council’s specific planning and environment policies. We assist major schemes in the City of London, conversions under London boroughs and strategic developments across Greater London.
Our experience spans the diverse habitats and built typologies of the capital, from listed-building conversions and commercial towers in the City to suburban infill schemes and green-infrastructure-led regeneration in outer London. This regional understanding ensures every BNG assessment we deliver reflects the ecological character, planning policies and habitat opportunities of its location. Whether your scheme is a high-rise in Barbican, a mixed-use conversion in Shoreditch or a cultural-heritage redevelopment near St Paul’s, ACP Consultants can provide the local expertise you need to achieve compliant and measurable biodiversity net gain.

Explore Our Services in the London Region

Our London practice includes locally focused BNG consultancy services across all London boroughs including:

City of London – specialist surveys and BNG assessments for projects under the City of London Corporation.
Westminster & Kensington – BNG metric calculations and habitat management plans supporting the respective boroughs’ planning teams.
Southwark – ecological surveys and biodiversity gain plans aligned with the London Plan and local validation lists.
Hackney & Tower Hamlets – tailored biodiversity net gain assessments for urban regeneration within these boroughs.
Camden – site-specific BNG assessments and monitoring for developments within Camden’s jurisdiction.

Each of these borough-level services has its own dedicated page providing further details, survey options and planning guidance. If your borough is not listed above, please visit our London Regional Hub page for further information on biodiversity net gain support across your local council area.

Where ACP Consultants Are Located

We operate from our centralised office, but every BNG Consultant is strategically based across London and dedicated to regional service delivery. This hybrid model ensures you receive the benefit of national expertise alongside on-the-ground presence, with rapid mobilisation, local knowledge and bespoke support for your scheme.

FAQs about BNG in BNG in City of London

What does a BNG survey in City of London involve?

A BNG survey in City of London begins with a desk-based assessment of existing habitat, priority species and site constraints. This is followed by a site visit to verify baseline conditions, mapping via British National Grid coordinates and data capture. The survey feeds into the DEFRA Statutory Biodiversity Metric 4.0 calculation which determines the baseline biodiversity units and identifies the required uplift. It also identifies potential onsite or off-site habitat creation, enhancement and protection measures. Finally a report is produced with recommendations, design inputs and a Habitat Management and Monitoring Plan (HMMP) ready for planning submission.

When is BNG required in City of London planning applications?

BNG is required for most planning applications in England under the Environment Act 2021. Specifically, within the City of London this obligation is triggered by the Planning for Sustainability SPD which sets out Biodiversity Net Gain as a key component for major developments. Developers should engage BNG Consultants in City of London at the earliest possible stage, ideally during the pre-application meeting to integrate biodiversity planning within the design process and ensure compliance with validation requirements.

How does location intelligence and GIS help the BNG process in London?

Location intelligence and GIS tools support BNG by enabling spatial data analysis of habitats, trees, green roofs, connectivity corridors and London’s priority species. Using the British National Grid and other mapping systems, our consultants map baseline conditions, assess landscape context, simulate habitat creation scenarios and monitor change over time. This spatial approach adds rigour to metric calculations and helps planning authorities visualise how biodiversity uplift is delivered within the dense urban fabric of the City of London.

Can BNG be delivered off-site in the City of London area?

Yes. Where onsite opportunities are constrained, as is often the case in the City of London off-site delivery or purchase of biodiversity credits may be appropriate. The metric allows for off-site contributions provided the gain is measurable, additional and secured for at least 30 years. ACP Consultants can advise on suitable habitat banks, credit procurement and integration into the Biodiversity Gain Plan to satisfy the planning authority’s expectations.

What are typical timescales for BNG delivery in the City of London?

Timescales vary depending on scheme size and complexity. Early survey work and metric calculation should align with the planning application timeline. After planning consent, the HMMP must be implemented and monitoring continue over the agreed period (often 30 years). Engaging ACP Consultants early ensures that the BNG survey in City of London, metric modelling and documentation are completed in line with the planning submission timetable, avoiding costly redesigns or compliance failures.

How is City of London mapping used in biodiversity net gain assessments?

To prepare a biodiversity net gain City of London assessment, ACP Consultants use advanced City of London mapping layers and geographic information systems (GIS). These datasets identify existing habitats, green roofs, street trees and potential connectivity corridors. Combining spatial data analysis with British National Grid referencing allows us to visualise biodiversity opportunities across the City’s dense built environment. This approach ensures London biodiversity net gain plans are accurate, defendable and aligned with the council’s validation requirements.

How does the London Biodiversity Action Plan influence BNG in the City of London?

The London Biodiversity Action Plan (London BAP) and the London Biodiversity Partnership define conservation priorities for habitats and London priority species such as bats, pollinators and urban birds. When we deliver BNG in City of London projects, we cross-reference metric outcomes with BAP targets to maximise local ecological value. Our BNG Consultants London team ensures that gain units contribute directly to London-wide biodiversity networks and the London Green Infrastructure Framework.

What role does location intelligence play in London’s urban planning and biodiversity mapping?

In urban planning London projects, location intelligence integrates real-time environmental mapping, spatial data analysis and cartography services to identify biodiversity opportunities. Our consultants use geographic data visualisation to model BNG in City of London outcomes, track green roof performance and optimise habitat connectivity within smart city initiatives. These tools support the City Corporation’s objectives for resilient urban development projects.

How does biodiversity net gain align with London Wildlife Trust and partnership initiatives?

The London Wildlife Trust and the London Biodiversity Partnership collaborate to protect and restore urban habitats through programmes such as the Capital Growth and Wild London schemes. BNG Consultants in City of London often reference these partnerships to align development plans with local conservation targets. By integrating data from London Wildlife Trust and GIGL (Greenspace Information for Greater London), our biodiversity net gain City of London assessments support regional biodiversity objectives and help developers demonstrate meaningful contributions to London’s ecological network.

What’s new for BNG in City of London 2021 and beyond?

The BNG in City of London 2021 study established a baseline for future urban greening and biodiversity targets. Since then, the Environment Act 2021 has made BNG mandatory for most developments, with the City Corporation adopting enhanced validation requirements and urban greening standards. ACP Consultants continues to monitor policy updates, ensuring each BNG survey in City of London remains fully compliant and supports sustainable growth under the London Green Infrastructure Framework.

Relevent Guidance Links

City of London Planning for Sustainability SPD.

City of London

London Urban Greening and BNG Design Guide.

London City Hall

London Biodiversity Action Plan.

GiGL

References & Guidance for Biodiversity Net Gain (BNG) in the City of London

The following resources provide the key statutory, strategic, and technical context for delivering Biodiversity Net Gain (BNG) and sustainable planning outcomes within the City of London. They form the foundation for ACP Consultants’ work on BNG surveys, assessments, and Biodiversity Gain Plans, ensuring alignment with the City Plan 2040, the London Plan 2021, and regional biodiversity policy.

City Plan 2040 – City of London Corporation
The City’s statutory development plan, setting out the vision for sustainable growth, design quality, and environmental enhancement including mandatory Biodiversity Net Gain provisions.
City Plan 2040 (PDF Download)
Full publication of the City Plan 2040, detailing policy OS2 and OS3 on biodiversity, open space, and ecological resilience for developments in the Square Mile.
City Plan 2040 Examination in Public – City of London Corporation
Official examination portal containing inspector updates, schedules, and evidence base for the City Plan 2040 adoption process.
City Plan 2040 Evidence Base
Library of technical evidence supporting the City Plan 2040, including background studies on biodiversity, air quality, and sustainable design.
Biodiversity Net Gain Study 2023 – City of London Corporation
Research document assessing how Biodiversity Net Gain can be implemented in high-density urban contexts such as the City of London, informing policy wording and metric application.
London Plan 2021 – Greater London Authority
The overarching spatial development strategy for Greater London, setting regional standards for biodiversity, urban greening, and sustainability targets.
London Plan (General Access Page)
Overview of the London Plan policies governing land use, ecology, and design integration across all London boroughs.
Urban Greening and Biodiversity Net Gain Design Guide – Greater London Authority
Practical guidance for integrating biodiversity net gain and urban greening into city design, supporting the implementation of Policy G5 and G6 of the London Plan.
Biodiversity – Greater London Authority Environment Team
Explains London-wide biodiversity priorities, habitat types, and delivery programmes underpinning biodiversity enhancement in the capital.
Our Green Capital – London Biodiversity Partnership (LBP)
Strategic publication on maintaining and enhancing London’s biodiversity network through partnership working, species action plans, and community initiatives.
Parks for London – Biodiversity Resources
Resources and best-practice guidance for managing biodiversity in parks and public spaces, relevant to urban greening and long-term BNG management.
Planning Data – City of London Entity Profile (Planning.Data.Gov.UK)
Centralised government data record identifying the City of London as a planning authority and linking to its statutory development plan information.

At every stage, our goal is clear: to enable your project to deliver robust, measurable and compliant biodiversity net gain within the City of London environment. Request a BNG Assessment today with ACP Consultants and let our experts guide your development to a nature‐positive outcome.

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Last Updated:

November 11, 2025

Disclaimer: Our content is prepared by ACP Consultants’ in-house specialists and is based on current guidance, standards, and best practice in environmental consultancy. While we make every effort to keep information accurate and up to date, it is provided for general guidance only and should not be relied upon as a substitute for professional advice on specific projects. Planning authorities retain final decision-making powers, and requirements may vary between local authorities and over time. ACP Consultants accepts no liability for any loss arising from reliance on this content without obtaining tailored advice for your project.