BNG Biodiversity Net Gain Monitoring Survey Kensington and Chelsea, London: RBKC
The Royal Borough of Kensington and Chelsea (RBKC) is London's most urban borough — only 19% of RBKC is open space, the least per head of any London borough. With 24 designated Sites of Importance for Nature Conservation (SINCs), extensive conservation areas, and dense development, BNG in RBKC requires expert ecological input and careful planning.
RBKC BNG Requirements
| Requirement | Detail | | --- | --- | | Minimum BNG | 10% net gain using Defra's Statutory Biodiversity Metric 4.0 | | Legal Agreement | Section 106 or conservation covenant — 30-year minimum | | HMMP Required | Major developments must submit HMMP with planning application | | Monitoring schedule | Reports typically at years 2, 5, 10, 15, 20, 25, and 30 | | Mandatory since | 12 February 2024 (major sites); 2 April 2024 (small sites) |
RBKC-Specific Context
Kensington and Chelsea presents unique BNG challenges:
| Factor | Impact on BNG | | --- | --- | | Limited green space | Only 19% open space — least in London | | 24 designated SINCs | Development near SINCs requires specific ecological assessment | | Dense urban fabric | On-site BNG delivery extremely challenging | | Heritage constraints | Conservation areas and listed buildings restrict habitat creation | | Holland Park | The borough's primary nature conservation area — receptor site potential |
RBKC's Ecology Service Team is based at Holland Park Ecology Centre, Ilchester Place, London W8 6LU.
What's Included in a BNG Monitoring Survey (RBKC)
| Component | Description | | --- | --- | | Baseline habitat survey | UK Hab classification of existing habitats | | Biodiversity Metric 4.0 calculation | Pre-development biodiversity value | | Biodiversity Gain Plan | 30-year management plan for RBKC submission | | SINC proximity assessment | Assessment if site is adjacent to or affects a SINC | | HMMP drafting | Habitat Management and Monitoring Plan |
RBKC Biodiversity Action Plan 2022–2027
RBKC's Biodiversity Action Plan guides local nature recovery. Developments in RBKC should consider how they can contribute to the borough's biodiversity targets beyond the minimum 10% net gain.
BNG Monitoring Survey Costs in RBKC (2025)
| Cost Component | Range (ex VAT) | | --- | --- | | BNG initial assessment | £1,500–£7,500+ (varies by site size and complexity) | | Biodiversity Gain Plan | £800–£2,500 | | HMMP drafting | £500–£2,000 | | Council monitoring fees | Confirm with RBKC Ecology Service Team | | Off-site BNG units | From £5,000 per hectare | | Statutory biodiversity credits | From £10,000+ per credit |
RBKC's specific BNG monitoring fees for 2025/26 should be confirmed directly with the RBKC Ecology Service Team.
30-Year Monitoring Schedule (RBKC)
| Year | Activity | | --- | --- | | Pre-development | Baseline survey + Biodiversity Gain Plan + draft HMMP | | Year 2 | First monitoring report | | Year 5 | Monitoring report + metric update | | Year 10 | Full monitoring report | | Year 15 | Monitoring report | | Year 20 | Monitoring report + metric update | | Year 25 | Monitoring report | | Year 30 | Final compliance survey |
Frequently Asked Questions
Q: When did BNG become mandatory in RBKC?
BNG became compulsory from 12 February 2024 (major sites) and 2 April 2024 (small sites) under the Environment Act 2021.
Q: Can BNG be delivered on-site in Kensington and Chelsea?
On-site BNG delivery in RBKC is extremely challenging due to the borough's urban density and limited green space. Off-site BNG through conservation covenant or statutory credits is often the only viable route.
Q: Does my RBKC development need a SINC assessment?
If your site is adjacent to or within 100m of a designated SINC (RBKC has 24), specific ecological assessment is required. Contact RBKC's Ecology Service Team to confirm triggers.
Q: Who conducts BNG monitoring surveys in RBKC?
A competent professional ecologist must write the HMMP and include a statement of competence. Work with a surveyor experienced in RBKC's specific requirements.
Q: What is RBKC's approach to off-site BNG?
RBKC's limited green space makes off-site BNG the practical route for most developments. Off-site units can be secured through a conservation covenant with a land manager or via Natural England's statutory credit scheme.
Q: How does the Biodiversity Action Plan affect my development?
RBKC's BAP sets local nature recovery priorities. Developments are encouraged to contribute to BAP targets — this may involve habitat creation beyond the minimum 10% net gain or habitat creation on RBKC's priority sites.