By Chris Rush, Pegasus Group
Summary: From climate resilience and air quality to noise and lighting, Sadiq Khan’s London Plan is pushing for environmental risks to more closely shape the design and planning process. Here’s what developers need to know.
Key takeaways:
- Sadiq Khan’s London Plan requires developers to integrate climate, air, noise, and lighting into the concept design stage.
- Schemes must demonstrate how buildings will remain comfortable and functional in future climate conditions, making factors like overheating and flood resilience core design drivers.
- Beyond meeting basic policy thresholds, air quality considerations will actively shape where developments are placed.
- Developers must use early-stage acoustic and lighting strategies to manage overall soundscapes, improve public realms, and protect biodiversity.
- Addressing environmental performance from day one will make schemes easier to justify and consent, while avoiding costly late-stage redesigns or overengineered solutions.
A common thread in the London Plan is that the Mayor doesn’t want the planning and design process to treat environmental risks as a compliance tick box exercise. On the contrary, the draft London Plan moves environmental considerations further upstream in the development process. In practice, this means climate, air quality, noise, and lighting are all increasingly expected to influence the design of developments from inception.
In the past, these environmental design aspects have been addressed through technical reports at the end of the planning process. What the London Plan means for developers and design teams is this: schemes that integrate environmental performance from concept stage will be easier to justify and secure consent for. Those that bolt on environmental considerations later will face greater scrutiny.
Let’s dive deeper into the proposed changes.
Climate: Is the London Plan moving away from carbon targets to resilient places?
Yes, in short, developers will need to demonstrate not only carbon footprint reductions for their scheme, but also how that scheme will remain functional and comfortable in future climate conditions.
The London Plan has historically already placed importance on climate change in planning debates. In keeping with that, the new draft moves the needle further, acknowledging that climate resilience requires more than just carbon footprint reductions.
This means that in addition to energy efficiency, developers will have to consider the following within their projects:
- Long-term resilience
- Building performance
- Occupant wellbeing
- Futureproofing assets
All of this will affect site layouts, building form, materials used, and landscape strategies. Climate-related requirements, such as those related to flood resilience and overheating, will effectively become standard planning considerations that developers must address from day one.
Air quality is now more than just a policy compliance issue
Similarly to climate resilience, air quality has also seen its role in developments elevated in the draft London Plan.
Previously, air quality has been treated in a more rudimentary way – another compliance box to be ticked. The Mayor’s latest proposals, however, seek to change that, with air quality now more likely to have a growing influence on:
- Ventilation strategies
- Building orientation
- Public realm design
- Location of sensitive uses such as homes, schools, and healthcare facilities
- Construction activities and site logistics
The ambition here is for developers and local authorities to demonstrate how a scheme improves local environmental conditions beyond basic compliance. While it’s a more demanding standard, it’s also more constructive. In the long run, it will encourage developers to gravitate towards design choices for schemes that can support healthier and better environments for future occupants and neighbours.
Noise becoming more integral to placemaking
Noise is a long-running critical issue in London, particularly in dense, mixed-use areas. Like air quality, though, the solution to this has often focused heavily on compliance assessments and bringing noise impacts down to acceptable levels.
The running theme here, again, is that the Mayor wants to treat noise as more than a compliance assessment. Developers will therefore be expected to consider noise as a fundamental part of the design quality of a place, rather than a constraint to be managed after the fact.
This will likely shift more emphasis onto early-stage acoustic feasibility studies and design-led mitigation that considers the whole soundscape of a place. More specifically, it’s about assessing how noise interacts with building use, layout, materials, and the public realm – and even how to manage construction noise during the build phase.
As with all the other environmental considerations the London Plan addresses, the goal here is clearly to balance growth objectives sensibly with health and amenity considerations.
Lighting to support safer and clear places
Lighting follows a similar pattern. The London Plan is encouraging developments to demonstrate how lighting:
- Supports safe and attractive places
- Avoids unnecessary light spill
- Protects biodiversity and ecological networks
- Minimises impacts on neighbouring properties
- Contributes positively to public realm quality
The expectation is moving towards an approach where lighting is considered as part of the overall environmental strategy instead of as an afterthought.
What this means for delivery
Whether it’s climate, air, noise, or light, the London Plan is pushing for a development system in which environmental considerations are not just treated as risks or compliance, but as factors that can enhance places. Climate factors are becoming a core part of the design narrative as opposed to technical inputs.
While it’s true that in the short term this will introduce new challenges for developers to tackle – i.e projects requiring more integrated working — there’s also a big opportunity. Making the environment part of the design process and planning strategy has the potential to futureproof places that people want to live in and continue investing in. Those who embrace this shift will be best placed to deliver the kind of healthy and resilient places that create more long-term value.
Helping developers embrace this change is exactly what our Climate, Air, Noise team at Pegasus is doing. We strongly believe every project today must take an integrated view of climate considerations, air quality measures, and acoustics to inform design choices that save space, cut carbon, and protect budget. The benefits of this go far beyond compliance, including making sure projects aren’t overdesigned so they can achieve the best return on investment.
If you have a project you wish to discuss with our Climate, Air, Noise team, please contact Chris Rush.
