UK law does not set a fixed maximum temperature at which work must stop, but employers still have legal duties to protect staff from heat-related risk. The absence of a statutory “too hot to work” threshold means the issue is governed by general health and safety obligations rather than a specific temperature limit.
This position is legally significant because it places the focus on whether the working environment is safe, not simply on the reading of a thermometer. Employers must assess heat as a workplace hazard and take proportionate steps to reduce risk where conditions are likely to cause harm. That approach applies regardless of whether the work is carried out indoors or elsewhere, provided the heat creates a foreseeable health and safety concern.
For workers, the practical consequence is that there is no automatic right to stop work solely because a particular temperature has been reached. Any decision to continue, modify or pause work will depend on the overall risk assessment and the measures in place to manage heat. Where the temperature creates a real risk to health, the legal question is whether the employer has acted reasonably in response to that risk.
The legal framework therefore requires employers to look beyond a fixed figure and consider the actual conditions, the nature of the work and the effect of heat on staff wellbeing. In practice, that means heat management must be treated as part of ordinary workplace safety compliance, rather than as an issue controlled by a single statutory limit.
There is no UK “too hot to work” temperature, but employers who fail to address heat-related risk may still face legal exposure under general health and safety duties.
Disclaimer: This post is for general information only and does not constitute legal advice. Specific advice should be sought for your particular circumstances.
Source: https://www.lboro.ac.uk