Case Study 1: From Demolition to Regeneration: Embedding BNG into a New Urban Dwelling
An architect-led proposal in London aimed to demolish an existing outbuilding and construct a two-storey side-to-rear extension, transforming the site into an 8-bedroom residential dwelling.
While the development fell within the scope of a householder application, typically exempt from Biodiversity Net Gain (BNG) requirements, the applicant voluntarily chose to engage with BNG best practices, showcasing a proactive approach to sustainable development.
Case Study Challenge
Traditionally, small-scale residential projects such as this are not mandated to demonstrate BNG, often leaving biodiversity considerations by the wayside. However, with the introduction of the Small Sites Metric (SSM) and increased awareness of the Small Site BNG policy, the architect recognised an opportunity to align with emerging environmental standards.
Solution
The applicant leveraged the Small Sites Metric as a practical and approachable tool for assessing and incorporating biodiversity improvements.
This digital tool simplified the process and enabled the swift production of a comprehensive BNG report. The collaborative nature of the project allowed architects and BNG specialists to work hand-in-hand, embedding ecological enhancements directly into the site design.
Key interventions included:
- Installation of a green roof for stormwater management and habitat creation
- Designation of a BNG-gain area with public access to enhance community engagement
- Hedgerow extension to improve habitat connectivity
The integration of these features not only elevated the environmental value of the site but also demonstrated a replicable model for future small-scale urban projects.
Impact
Without the accessibility and clarity provided by the Small Sites Metric, it is unlikely that biodiversity considerations would have been integrated into this development. This case underscores the power of simple digital tools in transforming developer attitudes and encouraging environmentally responsible design choices.
Project Details
- Size: 381 m²
- Estimated BNG Assessment Cost: £1,250
- Time to Complete Assessment: 6 hours
- Region: London
- Development Type: Residential
- Applicant Type: Architect
Case Study 2: Enhancing Urban Biodiversity Through Strategic Greenspace in a Mixed-Use Development
Located in the South East, this mixed-use development project involved the creation of several residential units alongside a commercial building. The site was previously dominated by sealed concrete surfaces, presenting limited ecological value.
Although eligible for the de minimis exemption under the Biodiversity Net Gain (BNG) framework, the developer voluntarily opted to engage with the BNG process to explore opportunities for environmental improvement.
Case Study Challenge
Urban developments often lack viable space for meaningful green infrastructure, particularly when built on fully sealed surfaces. Without a mandate to demonstrate BNG, many developers might overlook potential enhancements altogether. The key challenge here was to identify a simple, cost-effective way to introduce biodiversity gains within the tight constraints of the urban footprint.
Solution
By using digital tools and the Small Sites Metric (SSM), the developer was able to quickly assess various design iterations and model their biodiversity outcomes. This enabled a practical and iterative approach to BNG planning. A narrow strip of communal vegetated garden was introduced into the site design, an amenity greenspace that served both as a social feature and a biodiversity asset.
This strategic green strip created a “habitat island” in an otherwise grey urban landscape. The simplicity of the SSM process allowed the development team to evaluate its viability, tweak the layout, and finalise the integration in minutes, something that would have been unlikely or infeasible without such accessible tools.
Impact
The result was a 20%+ biodiversity net gain, achieved through the thoughtful integration of soft landscaping in an urban environment. The presence of the SSM directly influenced the inclusion of this feature. Without it, this micro-habitat would not have been considered, and a valuable opportunity to green the urban fabric would have been lost.
Project Details
- Size: 712 m²
- Estimated BNG Assessment Cost: £500
- Time to Complete Assessment: 6 hours
- Region: South East
- Development Type: Mixed (Residential + Commercial)
- Applicant Type: Architect
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