Almost five million households at risk from illegal gas fitters

  • Employing tradespeople based on looks rather than qualifications is putting Brits at risk
  • Two-thirds of gas jobs carried out by illegal fitters found to be unsafe by Gas Safe Register

New research has revealed that almost five million people across the UK are putting themselves at risk from carbon monoxide poisoning, gas leaks, fires and explosions by employing illegal gas engineers who aren’t properly qualified.

Gas Safe Register, the nation’s only official legal gas registration scheme, found that nearly one in five people (19%) who employed a tradesperson to work on a gas appliance did not check their ID card or qualifications.

This comes as Gas Safe Register releases four years’ worth of data from its investigations team, which searches out unqualified and unregistered gas fitters across the UK. The team found that a worrying 65% of gas jobs carried out by illegal fitters were unsafe and one in five gas appliances were so dangerous that they had to be disconnected immediately.

The study found that people are most likely to employ a tradesperson based on recommendations from friends or family members (53%), and trust them based on their personal presentation (41%) or how official they look (30%), rather than on their qualifications (11%).

Matt Allwright, consumer rights champion, said:

“Gas Safe Register’s data demonstrates that too many people are letting illegal gas fitters into their home and putting their families at risk. It is vital that people don’t just trust a friendly face but make sure fitters are Gas Safe registered and qualified to work in their property, as the consequences of an unsafe gas appliance can be fatal.”

Jonathan Samuel, chief executive of Gas Safe Register, said: “Our investigation team’s data shows how dangerous it is to let unregistered gas fitters carry out work in your home. We are therefore calling on people to ‘trust the triangle’ by checking for the Gas Safe Register logo on gas fitters’ ID cards, and help keep their families safe by only employing registered engineers who are qualified to work on the appliance in question.”

Gas Safe Register’s investigations team has inspected over 2,300 illegal gas jobs over the past four years. Significant disparity between different regions and cities across the country can be found when it comes to the number of dangerous gas jobs carried out by illegal fitters. For example, 51% of jobs in the South East were found to be unsafe compared to 78% in Yorkshire and Humber, including 96% of jobs investigated in Leeds.


Top 10 unsafe cities in the UK

Leeds: 96% of illegal gas jobs found to be unsafe.

Nottingham: 86% of illegal gas jobs found to be unsafe.

Southampton: 80% of illegal gas jobs found to be unsafe.

London: 74% of illegal gas jobs found to be unsafe.

Edinburgh: 71% of illegal gas jobs found to be unsafe.

Manchester: 68% of illegal gas jobs found to be unsafe.

Sheffield: 63% of illegal gas jobs found to be unsafe.

Liverpool: 61% of illegal gas jobs found to be unsafe.

Glasgow: 59% of illegal gas jobs found to be unsafe.

Birmingham: >54% of illegal gas jobs found to be unsafe.


To keep you and your family safe, follow Gas Safe Register’s top tips: 

  1. Only employ a legal Gas Safe registered engineer when having gas work carried out in your home. You can find a registered engineer in your area by calling Gas Safe Register on 0800 408 5500 or by visiting
  2. ‘Trust the Triangle’ and always ask to see your engineer’s Gas Safe ID card. Make sure you check the back of the card, which will state which gas appliances they are qualified to work on.
  3. Know the symptoms of CO poisoning; headaches, nausea, breathlessness, collapse, dizziness and loss of consciousness.
  4. If you smell gas or think there might be a gas leak, call the free 24-hour national gas emergency number immediately on 0800 111 999.
  5. If you suspect that someone is an illegal fitter or are worried about gas work carried out in your home, please contact Gas Safe Register.

To find out more about the dangers posed by unsafe gas appliances in your area visit, and to find a Gas Safe registered engineer call 0800 408 5500 or visit