How the Draft London Plan is changing the city’s built environment

The new Draft London Plan has been published and could create a shift in the way we design.  

Its proposed changes signal a decisive shift in London's sustainability strategy; away from carbon-offsetting percentages, towards strict performance-based energy frameworks and active climate resilience.

This is more than a policy update. It marks a transition from demonstrating compliance to proving performance.  

A move towards performance-based energy metrics and operational outcomes

The Draft Plan moves away from traditional approaches to carbon-offsetting, placing greater emphasis on concrete performance baselines for new developments. 

Under the current London Plan (2021) major developments are required to target net zero carbon, demanding a minimum 35% reduction on site compared to building regulations. Any carbon shortfall not met on-site is currently resolved through a cash-in-lieu offset fund to the local authority - standardised at recommended rates, eg £95/tonne. 

The Draft Plan seeks to remove the offset levy system to streamline requirements and reduce added financial and procedural layers. This includes:  

• Energy Use Intensity (EUI): setting absolute energy targets per square metre to enforce operational energy efficiency 

• Space Heating Demand (SHD): setting strict energy limits explicitly for heating requirements 

• Post-occupancy monitoring: major developments will be required to track and report energy figures for up to five years post-construction
• Tech-neutral heating: utilising tailored Low Carbon Heat Appraisals to find the cleanest, site-specific heating options 

Climate resilience and passive cooling

Following recent and severe summer heatwaves, the Draft London Plan will heavily penalise technologies that exacerbate the urban heat island effect. 

This means:

• Passive over active: air conditioning will face strong opposition; active cooling will be an absolute last resort
• External shading: mandates features like external shutters or facades to mitigate solar heat gain
• Waste heat controls: restricts development layouts that actively reject waste heat directly into London's streets

These changes will impact the way buildings are designed and delivered, and the decision-making process. 

Meeting sustainability requirements on paper will no longer be enough. 

As we design and prepare for a hotter London, future developments will need to demonstrate measurable performance, resilience and long-term adaptability.