London’s ambition to deliver a large scale low carbon heat network across the Square Mile has just been announced and it is a clear signal that the capital is serious about decarbonisation and long term resilience.
Summary of the Square Mile heat network procurement:
- The City of London Corporation has launched a major procurement to find a development partner to design, build and operate a flagship low carbon heat network across the Square Mile
- The project is valued at around £4.3 billion over the lifetime of the concession
- It will be delivered through a single long-term concession, with a partner forming a Special Purpose Vehicle to take it from design through to operation
- The network could ultimately supply heat to around 1,200 buildings in the Square Mile
- The River Thames is expected to play a strategic role as a heat source and corridor for major heat mains channels
- The procurement process is staged with applications, interim and final tenders leading to a preferred bidder announcement targeted for November 2026
- The City will not take a direct economic return but will retain a “golden share” to safeguard governance and key strategic decisions
- Early modelling and studies show significant capital expenditure on heat network infrastructure, driven in part by anticipated connection mandates and high annual heat demand across buildings
How passive fire protection must dovetail with the new heat network
But alongside energy efficiency and sustainability targets there is a quieter and equally critical consideration that must not be overlooked: fire safety and in particular passive fire protection.
At Block Compliance Ltd we regularly work across London on complex buildings where new services, refurbishments and upgrades intersect with existing structures. These projects highlight a consistent truth: when infrastructure evolves, fire risk changes too. Passive fire protection is what ensures that change does not compromise life safety.
London’s dense and layered built environment makes this especially relevant
Historic buildings sit alongside modern commercial spaces and residential blocks, often undergoing continual adaptation. Introducing new plant, pipework or heat network connections without properly assessing compartmentation and fire stopping can unintentionally weaken the very fabric that keeps people safe.
Our passive fire protection case studies in London show how these risks can be managed properly in practice
At 26 to 29 Bruton Street in Mayfair, Block Compliance Ltd carried out detailed fire door surveys within a high end commercial and heritage setting. The building required careful assessment to ensure that fire doors met current standards while respecting the quality and character of the space. This type of work is typical of central London where compliance must be achieved without disrupting occupiers or undermining architectural value.
A similar approach was taken at 20 to 22 Berkeley Square, another prominent Mayfair location. Here our team delivered comprehensive fire door surveys within a prestigious and complex building layout. The project highlighted how even premium properties can carry hidden risks when passive fire protection has not been reviewed as buildings evolve over time. Addressing these issues early helped the duty holder demonstrate compliance and reduce long term risk.
Another example of our work in London is at Imperial Wharf and Regent on the River where we supported ongoing fire risk assessment and fire safety management for residential buildings within this large mixed use riverside development. These sites involved thorough evaluation of passive fire measures to ensure residents and managers could maintain confidence in fire safety across high rise and interconnected blocks.
Large infrastructure schemes also introduce challenges at interfaces
New services often pass through multiple fire compartments, risers and floors. Without thorough su,rveys and clear documentation it becomes difficult for duty holders to evidence compliance under current fire safety legislation and the Building Safety Act.
Passive fire surveys and building safety case reports provide clarity, accountability and confidence that safety has been considered at every stage of change.
There is also a human factor that should not be underestimated
Occupants, residents and tenants increasingly expect reassurance that their buildings are not only sustainable, but safe. Energy efficiency gains mean little if fire safety is weakened in the process. A robust passive fire strategy supports trust, operational continuity and long term asset value.
London’s future infrastructure will rightly focus on reducing carbon and improving efficiency. For those responsible for managing and upgrading buildings, the challenge is ensuring that these improvements sit alongside proven fire safety fundamentals.
Passive fire protection should never be an afterthought or a box ticking exercise
At Block Compliance Ltd we help clients across London (and the UK) understand the real condition of their buildings and take practical steps to maintain and improve fire safety as change happens. Whether supporting retrofit projects, major upgrades or ongoing compliance, our role is to ensure that safety remains built in, not bolted on.
As London invests in its future, integrating passive fire protection from the outset remains one of the most effective ways to protect people, property and long term resilience.
