Gas Safety Week 2026: London Home Safety Checklist

According to the Gas Safe Register, Gas Safety Week 2026 runs from 14–20 September. London households should use it to test carbon monoxide alarms, inspect visible appliance areas, clear vents and confirm annual gas checks are current. If you smell gas, a CO alarm sounds or anyone develops symptoms, leave immediately and call for emergency help.

The 2026 campaign theme is “Take No Chances”. That means acting on unusual flames, soot, alarm warnings and unexplained illness instead of waiting to see whether the problem disappears.

This practical checklist covers what you can inspect safely, what requires a Gas Safe engineer and how homeowners, tenants and landlords should respond when something isn’t right.

Why Gas Safety Week 2026 matters in London

Gas Safety Week is a useful prompt to check your home before boilers and heating systems face heavier use during colder weather.

The campaign runs from 14 to 20 September 2026, according to the Gas Safe Register's campaign guidance. Its “Take No Chances” message focuses on early action to reduce the risks associated with unsafe gas work and appliances, including leaks, fires, explosions and carbon monoxide poisoning.

Carbon monoxide is especially difficult to detect because it cannot be seen, smelt or tasted. An audible alarm and professional appliance checks therefore perform different but complementary jobs.

Your practical home gas safety checklist

You can test alarms and make visual checks yourself, but servicing, repairs and appliance removal must be left to an appropriately qualified Gas Safe registered engineer.

Work through this checklist without opening, moving or dismantling an appliance:

• Test every carbon monoxide alarm using its test button.
• Confirm each alarm complies with BS EN 50291.
• Check the alarm’s expiry information and manufacturer’s instructions.
• Look around boilers, cookers and gas fires for soot, staining or visible damage.
• Check that boiler fault codes or warning lights haven’t been ignored.
• Make sure ventilation openings haven’t been covered by furniture, boxes or DIY work.
• Look outside, where safely accessible, for obvious flue obstructions.
• Check visible pipework for apparent corrosion or damage without touching it.
• Find your gas emergency control valve so you know where it is.
• Record when every gas appliance was last professionally checked.

Gas Safe Register campaign guidance recommends that gas appliances receive an annual safety check and regular servicing by a Gas Safe registered engineer. Our guide to what a boiler service includes explains what happens during a maintenance visit.

A carbon monoxide alarm is an additional safeguard. It doesn’t replace professional appliance checks, servicing or repairs.

The 10-minute household check

Start with the alarms, inspect the visible areas around each appliance and confirm that vents are unobstructed. Finish by checking your paperwork or service records to find the date of the last professional visit.

Follow the manufacturer’s instructions for alarm positioning, battery replacement, testing and complete unit replacement. Don’t rely on a universal distance from the boiler because approved placement can depend on the alarm and room.

Checks you should never attempt yourself

Don’t remove a boiler cover, disconnect an appliance, alter gas pipework or investigate a suspected leak. You should also avoid blocking ventilation to reduce draughts, as those openings may be required for safe operation.

What carbon monoxide and boiler warning signs matter?

Yellow flames, soot, repeated pilot-light failures and unusual condensation are all reasons to stop using an appliance and obtain professional advice.

A healthy gas flame is generally crisp and blue. According to the Gas Safe Register's 2026 Gas Safety Week guidance, warning signs can include:

• Lazy, uneven yellow or orange flames
• Black marks or soot around an appliance
• A pilot light that repeatedly goes out
• Unusual amounts of condensation
• Persistent error messages or fault codes
• A carbon monoxide alarm sounding

If a hob or other appliance develops an uneven yellow flame, switch it off rather than trying to investigate or repair it.

Arrange an appropriately qualified engineer visit before using the appliance again. If your boiler is showing persistent faults, professional boiler repair in London can identify the underlying problem.

Symptoms affecting people or pets

Gas Safe Register campaign information identifies six commonly cited symptoms of carbon monoxide poisoning:

1. Headache
2. Dizziness
3. Breathlessness
4. Nausea
5. Collapse
6. Loss of consciousness

Treat symptoms as urgent when several occupants become unwell together or feel better after going outdoors. Leave the building and seek emergency and medical help rather than remaining inside to locate the cause.

What should you do if you smell gas or suspect CO?

Leave the property and call urgently when there may be an active gas leak or carbon monoxide exposure; don’t wait for a routine engineer appointment.

If you smell gas and can act without putting yourself at risk:

1. Turn off the gas at the emergency control valve.
2. Open doors and windows.
3. Extinguish naked flames.
4. Don’t smoke or operate electrical switches.
5. Leave the building.
6. From outside, call the National Gas Emergency Service on 0800 111 999.

Call 999 for severe symptoms, collapse, fire or immediate danger. Remember that carbon monoxide has no smell: an odour of gas and a sounding CO alarm are separate emergency warning routes.

Emergency, urgent or routine?

Use this guide to decide what to do next:

How to choose a Gas Safe engineer in London

Check both the engineer’s registration and their qualifications for your particular appliance before work begins.

Being Gas Safe registered doesn’t automatically qualify someone to work on every category of appliance. Search the official Gas Safe Register and ask to see the engineer’s photo ID card. The reverse identifies the categories of gas work they’re qualified to undertake.

A quick engineer-verification checklist

Before work starts, confirm:

• The business appears on the Gas Safe Register
• The registration number matches
• The ID photograph matches the person at your door
• The card is still valid
• The listed qualifications cover your appliance and proposed work

For a gas safety check in London, ask whether the quote covers every appliance, testing, paperwork, parking or congestion costs and any follow-up work. A safety check assesses safe operation at the time of inspection; a service includes appliance-specific inspection and maintenance.

Costs depend on the property, number of appliances and work required. Figures should always be treated as indicative, so ask InstaGasWorks for a tailored quote.

Who is responsible: homeowner, tenant or landlord?

Landlords have legal annual gas-safety duties, while homeowners should arrange regular checks and tenants should report problems promptly.

Under HSE landlord gas-safety guidance, relevant appliances must generally be checked annually by a Gas Safe registered engineer. A current Gas Safety Record must usually be given to existing tenants within 28 days of the check and to new tenants before they move in.

Tenants should check the record’s date, report alarm or appliance faults in writing and provide reasonable access for safety appointments. Our London CP12 certificate guide explains the record and the landlord’s responsibilities in more detail.

In England, landlords must provide carbon monoxide alarms in rooms used as living accommodation containing specified fixed combustion appliances. Gas cookers are excluded from that particular alarm requirement. Once a tenant reports a faulty required alarm, the landlord must arrange its repair or replacement.

Gas Safety Record versus boiler service

These visits aren’t interchangeable:

Landlords can ask for both visits together, but should confirm exactly what the appointment and paperwork include.

Gas safety FAQs

These quick answers cover the most common questions London households ask about checks, alarms and engineers.

How often should gas appliances be checked?

Gas Safe Register campaign guidance recommends an annual safety check by a registered engineer. Appliances should also be serviced regularly in line with their manufacturer’s instructions.

Where should I put a carbon monoxide alarm near a boiler?

Choose a model compliant with BS EN 50291 and follow its manufacturer’s placement instructions. Avoid unsupported universal distance rules because the correct position can depend on the room and alarm design.

What should I do if my boiler flame is yellow?

Stop using the appliance and contact an engineer who is Gas Safe registered and qualified for that boiler. Yellow or orange flames can indicate incomplete combustion.

How can I check whether a London gas engineer is registered?

Search the official Gas Safe Register, inspect the engineer’s photo ID card and check the listed qualifications on its reverse. Confirm that those qualifications cover your appliance and job.

Is a gas safety check the same as a boiler service?

No. A gas safety check assesses whether an appliance is operating safely at that time. A service includes appliance-specific inspection and maintenance.

Who pays for a gas safety check in a rented London home?

The landlord is responsible for legally required annual checks and records covering relevant gas appliances. Tenants should report concerns and provide reasonable access for appointments.

Make Gas Safety Week 2026 a year-round habit

Gas Safety Week ends on 20 September 2026, but safe habits should continue throughout the year. Today, test your CO alarms, check the date of your last professional inspection and save 0800 111 999 in your phone.

If your annual check is due or an appliance is showing warning signs without an active emergency, you can contact InstaGasWorks for practical advice from a Gas Safe registered London engineer.