UK businesses face mounting pressure over workplace heat limits
Pressure is mounting on the UK government to introduce maximum workplace temperature limits, a regulatory shift that could force widespread capital expenditure upgrades across commercial real estate and public infrastructure.
London Mayor Sadiq Khan has backed calls for a legally binding maximum workplace temperature, adding political weight to a campaign that could impose significant new compliance and infrastructure costs on UK businesses.
Trade unions Unison and the Trades Union Congress are demanding a 30C ceiling, dropping to 27C for strenuous labour. The Climate Change Committee, which advises the government, recently made a similar recommendation, noting that formal limits are needed to incentivise the deployment of necessary cooling.
The regulatory pressure follows widespread operational failures during this summer's heatwaves, where some indoor temperatures exceeded 40C. Hospitals experienced critical disruptions, with MRI scanners and radiotherapy machines failing, IT systems stalling and whole-building cooling units breaking down. Transport networks also deteriorated, and thousands of schools were forced to close.
For commercial real estate and facility management executives, a mandated temperature cap would likely trigger extensive retrofits. Older office buildings, industrial sites and public sector estates currently lack the cooling capacity to maintain safe temperatures during extreme weather, pointing to a potential surge in capital expenditure.
Despite the growing chorus, the government is resisting immediate legislative action. A government spokesperson said it has “no plans to introduce a mandatory maximum workplace temperature,” pointing instead to existing Health and Safety Executive (HSE) guidance.
However, the regulatory horizon is not entirely closed. The HSE is preparing to launch a public consultation on workplace health and safety this year, which will explicitly review temperature thresholds alongside other issues. This creates a window for business groups to shape the policy before any statutory limits are drafted.
Political momentum is accelerating ahead of that consultation. Green party MP Hannah Spencer is preparing to introduce a parliamentary bill to establish a workplace heat limit. Local leaders are also pushing for central funding to upgrade public infrastructure.
Hackney mayor Zoë Garbett noted that councils are prepared to take on a statutory duty to lead the climate response, but warned: “We need the powers and – more importantly – proper funding to take action.”
For investors, the intersection of failing infrastructure, union demands and an upcoming government consultation elevates extreme heat from an environmental issue to a tangible operational risk. The June heatwave alone killed an estimated 440 people a day at its three-day peak, underscoring the systemic vulnerability of UK infrastructure to rising temperatures.
