UK law does not automatically allow workers to refuse to work because of extreme heat [1].
This distinction is critical as the Met Office issues red heat warnings later this week. While employees may believe they have a statutory right to stop working when temperatures rise, the legal responsibility for safety rests primarily with the employer.
Under health and safety law, employers have a legal duty to assess heat-related risks to their staff [1]. This means businesses must evaluate whether the working environment has become dangerous and implement measures to protect employees from heat-related illness [1].
There is no specific law that defines a temperature as too hot or too cold to work [1]. Instead, the focus remains on the employer's risk assessment. If a workplace becomes unsafe, employers may choose to send staff home during extreme-heat warnings to mitigate health risks [1].
Similar guidance applies to workers in Scotland, where employers are also expected to manage the risks associated with heatwaves [2]. The lack of a hard temperature limit means that the conditions for sending staff home or allowing them to leave vary by industry, and specific workplace environments.
Because there is no one-size-fits-all temperature threshold, disputes may arise between staff and management regarding when a site is truly unsafe. However, the overarching legal requirement is that employers must ensure a safe working environment, which includes managing the impact of extreme weather [1].
“UK law does not automatically allow workers to refuse to work because of extreme heat.”
The current legal framework in the UK places the burden of safety on the employer's judgment rather than a fixed statutory temperature limit. This creates a flexible but potentially ambiguous environment where worker safety depends on the quality of an employer's risk assessment rather than a universal legal right to cease work.
