Across the UK, developers, landowners and investors are navigating a rapidly evolving policy landscape shaped by climate targets, environmental legislation and changing market expectations.
From Biodiversity Net Gain planning requirements to stricter local policies on net zero development, energy and sustainability is now embedded into how schemes are designed, assessed and approved.
Sustainability is no longer a future ambition for the built environment, it is a present-day planning requirement, as Sophia Piatto, a Planner at Vail Williams, explores.
For those bringing forward development, understanding the direction of sustainable development planning in the UK is increasingly important. Not only does it influence planning outcomes, it also affects long-term asset value, investment appetite and occupier demand.
At Vail Williams, we are seeing several clear trends emerging across the planning system that are shaping the next generation of development.
Biodiversity Net Gain is reshaping development proposals
One of the most significant recent changes to the planning system was the introduction of mandatory Biodiversity Net Gain (BNG) under the Environment Act 2021.
Since February 2024, most developments in England must deliver at least a 10% improvement in biodiversity value compared with the pre-development baseline, measured using the statutory biodiversity metric.
This uplift must be secured for a minimum of 30 years and is typically formalised through planning conditions or legal agreements.
Importantly, some planning authorities are now expecting even higher uplifts. Guildford Borough Council, for example, requires 20% BNG in its Development Management Policies (Policy P7) – formally exceeding the national baseline.
As a result, developers need to consider biodiversity at the earliest stages of feasibility and masterplanning, exploring opportunities such as:
- Retaining existing habitats within site layouts
- Creating new ecological features such as wetlands, woodland and wildflower habitats
- Securing off-site biodiversity units where on-site delivery is constrained
Biodiversity is no longer simply a mitigation exercise at the end of the planning process, it is a core component of sustainable place-making.
A compelling example of this in London is from the Eden Project × Canary Wharf partnership, where the Eden Dock scheme has delivered floating ecological islands, a new green spine and extensive native planting within one of the UK’s densest commercial districts.
The project reports a 55% biodiversity net gain, supported by 770 m² of floating islands and 42 new trees, demonstrating that meaningful BNG uplift is possible even in highly urbanised environments.
Net zero development now a planning expectation
Alongside biodiversity policy, the transition to a net zero economy is also shaping the planning landscape.
The UK’s statutory target of reaching net zero greenhouse gas emissions by 2050 is increasingly reflected in planning policy and local authority strategies.
The National Planning Policy Framework (NPPF) already requires planning policies to support the transition to a low-carbon future, and many local authorities are now adopting even more ambitious requirements.
In London, for example, the London Plan requires major developments to follow the “be lean, be clean, be green” energy hierarchy and demonstrate pathways towards net zero operational carbon.
The Canada Water masterplan in London, demonstrates what net‑zero‑aligned development looks like in practice. The scheme is targeting net‑zero carbon homes, 100% electric buildings, high levels of energy performance (e.g. BREEAM Excellent, WELL Gold), and district energy integration, supported by extensive public realm and low‑carbon design measures.
Elsewhere, cities including Bristol, Manchester and Oxford have introduced policies requiring developments to demonstrate significant reductions in operational carbon, high standards of building energy efficiency and integration of renewable and low-carbon energy systems.
The Mayfield regeneration project in Manchester, for example, blends nature‑led regeneration with low‑carbon design principles. Office buildings within the scheme target ~600 kgCO₂e/m² embodied carbon, and the project has delivered significant biodiversity enhancements alongside sustainable transport and public space.
