Understanding the risks of hot work


Authored by Aviva

In June 2022, we updated our Policy Conditions to clarify our Customer Obligations relating to the use of heat – helping to ensure the safety of your clients, the premises they are working on and those carrying out the work. Some of the updated Obligations include:

  • Making sure that the equipment is in good condition.
  • Making sure that any combustible materials, gaps or holes, or flammable liquids within 25 metres of where a thermal lance is used are covered & protected by non-combustible sheets or screens.
  • At least two fire extinguishers with a 13A rating are within the area of the work being carried out, and a minimum of two CO² extinguishers will also be required for welding.
  • A minimum one-hour fire watch must be completed and recorded, after the work has completed.

The application of the updated Customer Obligation will be signposted in the Notice to Policyholder (NTP), with the full wording being printed in the customer’s schedule. 

Hot work is an integral part of many construction or maintenance projects, and with it comes multiple hazards that need to be managed, so it’s important to ensure your clients are fully aware of these risks and their obligations.

At Aviva, our team of risk consultants are on hand to support your clients whose operations regularly operate using hot work and to mitigate those associated hazards effectively.

What is hot work?

Hot work is one of the few occasions in which heat, sparks or naked flames are intentionally introduced into the workplace, making it a high-risk activity that needs to be managed and controlled effectively. Common hot work activities include anything that uses:

  • Gas and electric welding and cutting equipment
  • Blow lamps and blow torches
  • Electric or gas hot air guns, heaters or blowers
  • Bitumen and tar boilers
  • Angle grinders and grinding wheels
  • Brazing and soldering equipment
  • Drills
  • Any other equipment that can produce a spark, frictional heat or flame

What are the associated risks?

The use of hot work in any capacity always carries hazards. This includes sparks, excessive heat, conduction, flammable gases and swarf. Working with any kind of ignition greatly increases the risk of fire and therefore injury, death and damage to property. Hot work activities may ignite adjacent or unseen material, heat may be conducted away from the working area by metal components and sparks, or hot metal may travel a long distance while retaining the potential to ignite combustible materials. Many losses and injuries associated with hot work occur as a result of poor planning, risk assessments, or supervision. That’s why it’s so important for your clients and their staff to fully understand what hot works are and the hazards they impose on their work environment.

What procedures and controls do businesses need in place?

Whilst hot work should be considered a last resort and only authorised where a safer method is unavailable, the good news is that the risks of hot work can be greatly reduced if the correct assessment procedures and controls are in place. This would include:

  • Formal procedures - which apply to employees as well as contractors.
  • The hot work permit - it’s essential that people who are nominated to authorise hot work have experience or training in the associated hazards. The hot work permit should be completed and issued based on method statements and fire risk assessment for the works as well as a physical inspection of the work equipment and the area, immediately prior to the work commencing. You can learn more about permits in our hot work podcast.
  • Briefing and training - everyone who is required to sign or abide by the conditions of a permit must receive an appropriate briefing or training.
  • Spot checks and audits - including completed permits, training records and public liability insurances.
  • Managing contractors - checking the competency wherever contractors or sub-contractors are used.

The importance of the risk assessment

Before undertaking any kind of hot work, you should be aware of the importance of a robust risk assessment. When reviewing the proposed works, the fire risk assessment should reveal issues that could lead to injury or the likelihood of damage to equipment or property should a fire occur. It’s important to think about, should a fire occur, where the fire could spread to, whether there are combustible materials or construction nearby and who else on the premises needs to be notified. For more details on how to implement your risk assessment, including information on how to review the works, investigate the work area, and deciding whether it’s safe to proceed or information about hot work permits, read our ‘Hot Work Operations’ Loss Prevention Standard.

The criticality of the fire watch

You should be familiar with the hot work hazards to know when things don’t look quite right. Having someone on hand to oversee the hot works is therefore essential. The person completing the fire watch must have the confidence and authority to stop work if unsafe conditions develop, be familiar with the fire alarm locations and emergency notification procedures. They should be trained in the use of fire extinguishers or hose reels which are available. If the area of work is large, multi-levelled or congested, additional fire watchers may be needed. The fire watch doesn’t finish when the hot work ceases, it should be continuous for at least an hour after and subject to intermittent checks thereafter for a period determined by the risk assessment (a minimum of one hour but in many cases can be much longer).

Thermographic cameras

We’re always looking into the latest innovations and technology to better support our customers. Thermographic cameras are a great tool that can be used to manage risk and identify any particular areas of concern. Implementing them as part of your hot work controls is a very effective way to compare images and ensure the thermographic signatures match pre- and post work. 

For more information, read our Commercial Hot Work Guide, or refer to our  Hot Work Operations’ Loss Prevention Standard. If you're on the go, listen to our Hot Work podcast.


About Aviva

Aviva Insurance Limited is one of the UK’s leading insurance companies, part of the Aviva group with 34 million customers Worldwide. Aviva Insurance has been in the insurance business for more than 300 years.

In UK commercial, the insurance market remains challenging for insurance brokers and customers, due to the ongoing economic conditions. Aviva Insurance are focusing on improving our processes to ensure Aviva provide commercial customers with insurance cover at an acceptable price. Insurance brokers also recognised our excellent customer service by voting us Insurance Times General Insurer of the Year in 2012, for the second year running. youTalk-insurance sharing Aviva insurance news and video.

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