Designing Buildings - User contributions [en]

Biodiversity net gain in England

2026-05-28T10:15:07Z

Sarah jones: Created page with "Biodiversity net gain (BNG) is a planning requirement introduced under the Environment Act 2021 that requires new developments in England to deliver a measurable improvement in b..."

Biodiversity net gain (BNG) is a planning requirement introduced under the Environment Act 2021 that requires new developments in England to deliver a measurable improvement in biodiversity compared to the pre-development baseline. From February 2024, a minimum 10% biodiversity net gain became mandatory for most major developments in England.

Contents

# Legislative background
# The 10% BNG requirement
# How biodiversity is measured
# Delivering BNG
# BNG and the planning condition discharge process
# Exemptions
# Related articles

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1. Legislative background

Schedule 14 of the Environment Act 2021 introduced mandatory BNG requirements in England. The requirement was phased in as follows:

* February 2024: Mandatory for major developments (10 or more dwellings, or over 0.5 hectares)
* April 2024: Extended to small sites (under 10 dwellings)
* April 2024: Extended to nationally significant infrastructure projects (NSIPs) under a separate regime

Prior to mandatory BNG, many LPAs in England included BNG requirements in local plans on a discretionary basis.

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2. The 10% BNG requirement

Developers must demonstrate that their scheme will deliver at least 10% more biodiversity value after development than was present on the site before. This net gain must be maintained for a minimum of 30 years.

The requirement applies to the habitat units and hedgerow units present on the development site. A 10% net gain must be achieved across both habitat and hedgerow metrics independently.

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3. How biodiversity is measured

Biodiversity is quantified using the statutory biodiversity metric developed by Natural England (Metric 4.0 as of 2024). The metric calculates biodiversity units based on:

* Habitat type
* Habitat condition (assessed as Poor, Moderate, or Good)
* Spatial risk multiplier (accounting for geographic risk to habitat creation)
* Temporal risk multiplier (accounting for the time required for habitat to reach its target condition)

Assessments must be carried out by a suitably qualified ecologist. The metric is publicly available as a downloadable Excel tool from Natural England.

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4. Delivering BNG

Biodiversity net gain can be delivered through three routes, applied in order of preference (the mitigation hierarchy):

# On-site habitat creation or enhancement: The preferred route. Habitat is created or improved within the development site boundary.
# Off-site habitat creation or enhancement: Where on-site delivery is not possible or sufficient, developers can create or enhance habitat on land outside the development site. This land must be secured through a Section 106 agreement or conservation covenant.
# Statutory biodiversity credits: As a last resort, developers can purchase statutory biodiversity credits from the government. Credits are priced to incentivise on-site and off-site delivery.

BNG habitats must be secured and managed for a minimum of 30 years through a legal agreement.

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5. BNG and the planning condition discharge process

In most cases, BNG is secured through a combination of planning conditions and legal obligations. Pre-commencement conditions typically require submission and approval of:

* A pre-development biodiversity metric calculation
* A biodiversity gain plan detailing how the 10% net gain will be achieved
* A habitat management and monitoring plan (HMMP)

Post-development, a post-completion metric calculation and monitoring reports are usually required to demonstrate that the committed habitat units have been delivered.

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6. Exemptions

The following development types are exempt from mandatory BNG requirements:

* Householder applications (extensions, loft conversions etc.)
* Development with a de minimis impact on biodiversity (no impact on priority habitats and less than 25 square metres of impact on non-priority habitat)
* Permitted development (unless a condition is imposed requiring BNG)
* Biodiversity gain sites themselves
* Development subject to a hybrid BNG approach under the NSIP regime
* Self-build and custom-build housing (fewer than 10 units)

[[Category:Planning_permission]] [[Category:Regulations]] [[Category:Sustainability]] [[Category:Conservation]]

Planning condition discharge in England and Wales

2026-05-28T09:50:50Z

Sarah jones:

Planning condition discharge is the formal process by which a developer satisfies conditions attached to a planning permission before or during construction. Local planning authorities (LPAs) in England and Wales routinely attach conditions to planning permissions requiring specific matters to be approved prior to commencement, prior to occupation, or during the construction phase.

Contents

# What is planning condition discharge?
# Types of planning conditions
# The discharge process
# Timescales and fees
# Common reasons for refusal
# Related articles

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1. What is planning condition discharge?

When a planning permission is granted, it is often subject to conditions that must be satisfied before development can begin or be completed. Discharging a planning condition means formally applying to the LPA to confirm that the requirements of that condition have been met.

Failure to discharge conditions prior to commencement — where conditions are described as 'pre-commencement' — can render development unlawful, even if planning permission has been granted.

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2. Types of planning conditions

Planning conditions generally fall into the following categories:

* Pre-commencement conditions: Must be discharged before any works begin on site. Examples include approval of construction traffic management plans (CTMPs), contaminated land investigations, and drainage strategies.
* Pre-occupation conditions: Must be discharged before the completed building is occupied. Examples include acoustic testing, air tightness testing, and biodiversity net gain (BNG) compliance.
* Ongoing conditions: Apply throughout the life of the development, such as restrictions on operating hours or vehicle movements.
* Informative conditions: Do not require formal discharge but provide guidance to the developer.

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3. The discharge process

To discharge a planning condition, the applicant must submit a formal application to the relevant LPA using the Planning Portal. The application must include:

* A covering letter referencing the specific condition number(s) being discharged
* Supporting technical reports, drawings, or assessments relevant to each condition
* The appropriate fee (see section 4)

Common technical reports submitted as part of discharge applications include:

* Acoustic and noise assessments (BS4142)
* Air permeability (air tightness) test results
* SAP or SBEM energy calculations
* Flood risk assessments (FRAs) and sustainable drainage (SuDS) strategies
* Contaminated land Phase 1 desk studies and Phase 2 site investigations
* Biodiversity net gain (BNG) assessments and habitat management plans
* Daylight and sunlight assessments (BRE 209)
* Construction traffic management plans (CTMPs)
* Overheating assessments (Part O, TM59)

LPAs are required to consult relevant statutory consultees before issuing a decision. The quality and completeness of technical submissions significantly affects the speed of approval.

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4. Timescales and fees

Under the Town and Country Planning (Fees for Applications, Deemed Applications, Requests and Site Visits) (England) Regulations, the standard fee for a householder discharge application is £34 per condition. For other categories of development, the fee is £116 per request (which may cover multiple conditions).

LPAs have a statutory target of 8 weeks to determine discharge of condition applications. In practice, performance varies significantly between authorities. Applications with incomplete or insufficient technical evidence are frequently returned or subject to extended negotiation.

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5. Common reasons for refusal or delay

Discharge applications are commonly delayed or refused for the following reasons:

* Insufficient technical detail in supporting reports
* Reports not referencing the correct British Standard or methodology
* Failure to address all sub-requirements of a condition
* Inadequate consultation response from statutory consultees (e.g. Environment Agency, Highways England)
* Submission of reports prepared using superseded guidance

Applicants can reduce delays by ensuring technical reports are prepared by qualified specialists with experience of local authority requirements, and by pre-application engagement with the LPA where conditions are complex.

[[Category:Planning_permission]] [[Category:Regulations]]

Planning condition discharge in England and Wales

2026-05-28T09:49:06Z

Sarah jones: Created page with "Planning condition discharge is the formal process by which a developer satisfies conditions attached to a planning permission before or during construction. Local planning autho..."

Planning condition discharge is the formal process by which a developer satisfies conditions attached to a planning permission before or during construction. Local planning authorities (LPAs) in England and Wales routinely attach conditions to planning permissions requiring specific matters to be approved prior to commencement, prior to occupation, or during the construction phase.

Contents

# What is planning condition discharge?
# Types of planning conditions
# The discharge process
# Timescales and fees
# Common reasons for refusal
# Related articles

-----
1. What is planning condition discharge?

When a planning permission is granted, it is often subject to conditions that must be satisfied before development can begin or be completed. Discharging a planning condition means formally applying to the LPA to confirm that the requirements of that condition have been met.

Failure to discharge conditions prior to commencement — where conditions are described as 'pre-commencement' — can render development unlawful, even if planning permission has been granted.

-----
2. Types of planning conditions

Planning conditions generally fall into the following categories:

* Pre-commencement conditions: Must be discharged before any works begin on site. Examples include approval of construction traffic management plans (CTMPs), contaminated land investigations, and drainage strategies.
* Pre-occupation conditions: Must be discharged before the completed building is occupied. Examples include acoustic testing, air tightness testing, and biodiversity net gain (BNG) compliance.
* Ongoing conditions: Apply throughout the life of the development, such as restrictions on operating hours or vehicle movements.
* Informative conditions: Do not require formal discharge but provide guidance to the developer.

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3. The discharge process

To discharge a planning condition, the applicant must submit a formal application to the relevant LPA using the Planning Portal. The application must include:

* A covering letter referencing the specific condition number(s) being discharged
* Supporting technical reports, drawings, or assessments relevant to each condition
* The appropriate fee (see section 4)

Common technical reports submitted as part of discharge applications include:

* Acoustic and noise assessments (BS4142)
* Air permeability (air tightness) test results
* SAP or SBEM energy calculations
* Flood risk assessments (FRAs) and sustainable drainage (SuDS) strategies
* Contaminated land Phase 1 desk studies and Phase 2 site investigations
* Biodiversity net gain (BNG) assessments and habitat management plans
* Daylight and sunlight assessments (BRE 209)
* Construction traffic management plans (CTMPs)
* Overheating assessments (Part O, TM59)

LPAs are required to consult relevant statutory consultees before issuing a decision. The quality and completeness of technical submissions significantly affects the speed of approval.

-----
4. Timescales and fees

Under the Town and Country Planning (Fees for Applications, Deemed Applications, Requests and Site Visits) (England) Regulations, the standard fee for a householder discharge application is £34 per condition. For other categories of development, the fee is £116 per request (which may cover multiple conditions).

LPAs have a statutory target of 8 weeks to determine discharge of condition applications. In practice, performance varies significantly between authorities. Applications with incomplete or insufficient technical evidence are frequently returned or subject to extended negotiation.

-----
5. Common reasons for refusal or delay

Discharge applications are commonly delayed or refused for the following reasons:

* Insufficient technical detail in supporting reports
* Reports not referencing the correct British Standard or methodology
* Failure to address all sub-requirements of a condition
* Inadequate consultation response from statutory consultees (e.g. Environment Agency, Highways England)
* Submission of reports prepared using superseded guidance

Applicants can reduce delays by ensuring technical reports are prepared by qualified specialists with experience of local authority requirements, and by pre-application engagement with the LPA where conditions are complex.

6. Related articles

[[Planning permission]] [[Building regulations]] [[Biodiversity net gain]] [[Flood risk assessment]] [[Construction traffic management plan]] [[Standard Assessment Procedure SAP]] [[Air permeability testing]]

[[Category:Planning_permission]] [[Category:Regulations]]