ProHort provides Biodiversity Net Gain Assessments and Biodiversity Gain Plan support for development projects across Essex. From the Thames Estuary and coastal grazing marshes to the River Chelmer, ancient woodland and the Essex farmland landscape, we help clients understand their BNG requirements and plan how biodiversity gains can be delivered.
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Where the statutory biodiversity gain condition applies, the Biodiversity Gain Plan is submitted after planning permission has been granted. It must be approved by the relevant planning authority before development can commence.
ProHort can support Essex BNG condition discharge by helping bring the relevant ecological and planning information together. Depending on the project, this may involve:
Reviewing the existing BNG assessment, metric calculation and planning permission.
Checking that the proposed habitat measures reflect the approved site layout.
Setting out how on-site habitat creation and enhancement will contribute to the biodiversity gain objective.
Including details of registered off-site biodiversity gains or statutory credits where relevant.
Preparing the supporting information and documentation for submission.
Assisting with relevant queries or amendments raised during the approval process.
For larger or phased developments, the submission requirements may differ. An overall Biodiversity Gain Plan and separate phase plans may be required, so the approach should be considered against the structure of the planning permission.
The aim is to provide a clear, evidence-based plan that reflects the development that has actually been approved, rather than relying on a generic document that may not match the final proposals.
We support projects across: Chelmsford, Colchester, Basildon, Southend, Harlow, Braintree, Witham, Clacton, Maldon, Brentwood, Epping, Thurrock and all surrounding areas.
A Biodiversity Net Gain Assessment in Essex establishes the biodiversity value of a development site before work begins and calculates how the proposed development may change that value. It provides the habitat information and metric calculations needed to understand the site’s baseline and identify a suitable approach to achieving biodiversity gains.
Where the statutory BNG condition applies, development is generally required to deliver at least a 10% increase in biodiversity value. A site-specific assessment helps establish the starting position and informs decisions about habitat retention, enhancement and creation.
Our BNG assessment for development in Essex can include:
Habitat surveys and mapping to identify and record the habitats present within the site boundary.
Habitat condition assessments to establish the condition and distinctiveness of relevant habitat parcels.
Biodiversity metric calculations using the applicable statutory biodiversity metric.
Biodiversity Net Gain reporting setting out the site’s baseline biodiversity value and the anticipated post-development position.
Habitat retention and enhancement advice to inform site layouts, landscaping and development proposals.
Biodiversity uplift recommendations where additional on-site or off-site measures may be needed to achieve the required gain.
A well-informed BNG assessment can help developers identify ecological considerations early, understand the implications of proposed site layouts and make more informed decisions before their plans are finalised.
A Biodiversity Gain Plan in Essex sets out how a development will meet the biodiversity gain objective. It is a separate stage from the initial assessment and, where the statutory biodiversity gain condition applies, must be submitted to and approved by the relevant planning authority before development begins.
The plan brings together the approved development proposals, biodiversity metric information and details of how the required gains will be delivered. It should explain the proposed on-site habitat creation and enhancement, any registered off-site biodiversity gains and the arrangements for securing and managing those measures.
ProHort provides Biodiversity Gain Plan services in Essex to help clients prepare the information needed for this stage of the planning process.
Depending on the development, a Biodiversity Net Gain Plan may include:
Biodiversity metric calculations showing the proposed post-development biodiversity value.
On-site habitat creation and enhancement proposals, including the location, type and extent of planned habitat measures.
Off-site biodiversity units, where eligible registered gains are being used and allocated to the development.
Statutory biodiversity credits, where these form part of the proposed approach.
Habitat management and monitoring arrangements, including relevant long-term responsibilities.
Supporting plans and evidence to explain how the biodiversity gain objective will be achieved.
A Biodiversity Gain Plan for development in Essex should be consistent with the planning permission, approved drawings and relevant metric calculations. This allows the planning authority to consider how the proposed biodiversity gains will be delivered.
Essex contains a varied network of coastal, freshwater, woodland, grassland and agricultural habitats. These local characteristics can influence the biodiversity value of development sites and the opportunities available for habitat enhancement.
The Essex coastline includes estuaries, mudflats, saltmarsh, coastal grazing marsh and other intertidal and wetland habitats. The Thames Estuary, alongside the coastal areas around Southend, Canvey Island and the wider Essex coast, forms an important part of this landscape.
Development near coastal and estuarine environments may need careful consideration of existing wetland features, drainage channels, grazing marsh and habitat connections. Where these habitats are present within a site, their type and condition need to be accurately recorded as part of the BNG baseline.
Coastal location can also bring separate ecological and planning considerations, such as designated-site impacts and flood risk. These should be considered alongside the biodiversity metric rather than treated as interchangeable requirements.
The Rivers Chelmer, Blackwater, Colne, Crouch and Stour are important features of Essex’s landscape. Their wider corridors can include riverside vegetation, wetlands, floodplain habitats, ponds and networks of drainage channels.
For development around Chelmsford, Braintree, Colchester, Maldon and the surrounding areas, identifying the relationship between a site and nearby watercourses can help inform the ecological assessment. Existing wetland and riparian habitats may contribute to the site’s biodiversity value, while suitable enhancement opportunities will depend on the site’s characteristics and constraints.
Essex contains important woodland landscapes, including Epping Forest and Hatfield Forest, alongside smaller woodland blocks, ancient woodland and established tree networks across the county.
Where development sites contain woodland, mature trees or connecting hedgerows, their ecological characteristics and condition should be considered before layouts are finalised. Ancient woodland and certain ancient or veteran trees are subject to irreplaceable habitat provisions under the statutory BNG framework, so potential impacts require particular care and cannot simply be balanced through ordinary biodiversity unit calculations.
Heathland, acid grassland, species-rich grassland and scrub contribute to the ecological character of parts of Essex, including areas around Epping Forest, the north-west of the county and the wider countryside.
Agricultural sites may also contain valuable features such as hedgerows, field margins, ponds and areas of semi-natural grassland. These should not be overlooked when assessing a site’s baseline. Their value depends on the habitats actually present and their condition, rather than simply whether the land is currently used for agriculture.
Development across Essex includes residential expansion, commercial and logistics sites, infrastructure and regeneration of previously developed land. Areas around Basildon, Harlow, Chelmsford, Colchester, Thurrock and Southend-on-Sea each have different development and landscape contexts.
Previously developed land is not automatically of low biodiversity value. Brownfield sites can support habitat mosaics such as scrub, species-rich grassland, bare-ground features and other vegetation communities. A site-specific survey is therefore important before assumptions are made about its biodiversity baseline.
The Essex Local Nature Recovery Strategy (LNRS) was published on 10 July 2025. Prepared by Essex County Council as the responsible authority, it covers Greater Essex and identifies local priorities and opportunities for nature recovery.
The strategy focuses on creating larger, better-connected habitats and improving the condition and extent of a range of local environments. These include woodland, species-rich grassland, urban habitats, freshwater environments and coastal and marine habitats.
Its Local Habitat Map can help identify areas where habitat creation and enhancement may contribute to wider nature recovery priorities. This can be useful context when considering the location and type of biodiversity measures proposed for a development.
However, the LNRS does not replace a site-specific BNG assessment or the statutory biodiversity metric. A development site still needs to be surveyed and its existing habitats assessed. Proposed habitat measures must be suitable for the site and meet the applicable statutory requirements.
ProHort can help clients consider the Essex nature recovery context alongside their individual development proposals, ensuring that local priorities are considered without making assumptions about a site’s ecological value.
Whether you need a Biodiversity Net Gain Assessment for a proposed development or a Biodiversity Gain Plan to support Essex BNG condition discharge, ProHort can help you understand the ecological information and documentation required.
Contact our team to discuss your project and the support you need.
The Essex LNRS identifies local priorities for habitat creation, restoration and improved ecological connectivity. Its Local Habitat Map can help inform where proposed habitat measures may support wider nature recovery. However, it does not establish the biodiversity value of an individual development site or replace the statutory biodiversity metric. A site-specific assessment is still required.
Development near the Thames Estuary and other coastal areas may involve habitats such as saltmarsh, mudflats, coastal grazing marsh and wetland. These need to be accurately identified and assessed where they fall within the development site. There may also be separate considerations relating to designated sites, flood risk and coastal processes, which should be addressed alongside the BNG assessment.
Yes. Agricultural land can contain features that contribute to biodiversity, including established hedgerows, ponds, field margins, species-rich grassland and other semi-natural habitats. The biodiversity value depends on the actual habitats present and their condition. A survey should establish the baseline rather than assuming that farmland has a uniformly low ecological value.
Ancient woodland and certain ancient or veteran trees are treated as irreplaceable habitats under the statutory BNG framework. They are not assessed as ordinary habitat parcels that can simply be compensated for through standard biodiversity units. Development proposals should consider avoiding impacts, and any relevant statutory and planning requirements must be addressed.
Yes. Previously developed sites can support habitats such as scrub, grassland, bare-ground mosaics and other vegetation communities. Their existing biodiversity value needs to be established through an appropriate assessment. Where suitable, habitat creation and enhancement can be incorporated into site landscaping, green infrastructure and other development proposals.
Phased developments can have additional BNG submission requirements. Where the statutory phased-development provisions apply, an Overall Biodiversity Gain Plan must be approved before development begins, followed by a Phase Biodiversity Gain Plan for each phase before that phase starts. The plans should demonstrate how the biodiversity gain objective will be achieved across the development as a whole and through its individual phases.
