What’s the average boiler service cost in the UK (2026)

Having your boiler serviced probably isn’t the highlight of your year.

But finding out your boiler has stopped working on the coldest morning is even worse.

In 2026, the average cost to service a boiler in the UK is about £100. The exact price depends on your boiler type, your location, and which engineer you choose.

According to Checkatrade’s 2026 pricing data, a standard gas boiler service generally costs between £80 and £120, with an average price of around £100.

WarmZilla currently offers a one-off boiler service for £90 including VAT, while our annual service plan costs £8.99 per month.

So, what does the service fee actually cover?

Here’s a closer look at what’s involved.

How Much Does a Boiler Service Cost in 2026?

Most UK households can expect boiler service costs to fall within these ranges:

These prices are national estimates, not guaranteed quotes.

Your actual cost may change based on where you live, your boiler, the engineer, and if extra work is needed.

What Is A Boiler Service?

A boiler service is a professional inspection designed to check that your boiler is operating correctly and safely.

For a gas boiler, the service should be carried out by a Gas Safe registered engineer.

Your engineer will inspect the boiler, run safety and performance checks and look for signs of wear or developing faults.

Regular servicing can help spot small issues before they become costly repairs.

Since boiler repairs can cost hundreds of pounds, catching problems early is helpful.

An Engineer’s View

A routine service isn’t just a tick-box exercise; it’s our best chance to spot minor wear and tear before it triggers a total system failure mid-winter. Catching a deteriorating seal or a clogged trap early saves you both freezing mornings and costly emergency call-outs.

– Matthew Powell, Engineer

What Does A Boiler Service Include?

What happens during a service depends on your boiler and its manufacturer.

Still, most gas boiler services include several key checks.

Visual Inspection

Your engineer will inspect the boiler and surrounding installation for signs of damage, corrosion, leaks or deterioration.

They will also check that the boiler has been installed correctly and remains in suitable condition.

Boiler And Flue Checks

The flue carries combustion gases safely away from your home.

Jargon Buster: Flue
A pipe or channel that safely extracts dangerous exhaust gases, such as carbon monoxide, away from your boiler and out of your property.

Your engineer will inspect the flue and carry out relevant combustion tests to make sure the boiler is burning gas correctly.

Safety Checks

The engineer will test the boiler’s safety devices and make sure they operate as intended.

This is one of the most important reasons to leave gas boiler servicing to a Gas Safe registered professional.

Gas And Water Connections

Connections around the boiler will be checked for leaks and other potential problems.

Boiler Components

Depending on the boiler and manufacturer requirements, components may be inspected and cleaned where necessary.

This can include areas such as the condensate trap and internal electrical connections.

Boiler Performance

The engineer will test the boiler while it is operating.

This may include checking combustion readings, temperatures and other measurements against the manufacturer’s requirements.

What Does WarmZilla Check During a Boiler Service?

A WarmZilla boiler service currently includes:

• Combustion tests, including checks of the flue using a gas analyser
• Gas and flow temperature checks
• Seal inspections
• Safety-device checks
• Cleaning and checking electrical connections
• Clearing the condensate trap where required
• Checking gas and water boiler connections for leaks
• Checking the system filter
• Advice on how to operate your boiler correctly

A few important details are worth noting.

A standard WarmZilla service does not include boiler repairs, checking radiators or valves, checking external pipework or adjusting external heating controls.

If an engineer discovers a fault during the service, additional repair work may therefore be required.

How Long Does a Boiler Service Take?

A routine boiler service usually takes 30 to 60 minutes.

The exact time will depend on the boiler, its condition and how easy it is to access.

If your boiler is fairly new and has no clear issues, the service should be straightforward.

Older boilers that have missed services or show signs of wear might need more thorough checks.

What Affects the Cost of a Boiler Service?

There’s no single set price for boiler servicing in the UK.

Several factors can raise or lower the final cost.

Your Boiler Type

Gas, oil and electric boilers have different servicing requirements.

Oil boilers, for example, should normally be serviced by an appropriately qualified OFTEC technician rather than a Gas Safe engineer.

Where You Live

Labour rates vary around the country.

In London and the South East, boiler servicing often costs more than in other areas.

Your Boiler’s Age

It can take longer to inspect older boilers.

If a problem is found, replacement parts for older boilers may be harder to find.

Your Boiler’s Condition

A boiler service is primarily an inspection and maintenance appointment.

If the engineer discovers a fault that requires repair, replacement parts and additional labour may increase your overall bill.

Boiler Accessibility

The engineer needs enough space to reach the boiler safely.

If your boiler is in a tight or hard-to-reach spot, the service may take longer.

When You Book

Heating engineers are busiest when the weather gets colder and more boilers start having issues.

Booking your annual boiler service during spring or summer can make arranging an appointment easier.

This also gives you time to fix any problems before winter arrives.

Is an Annual Boiler Service a Legal Requirement?

For homeowners, there is generally no legal requirement to have your boiler serviced every year.

Still, it’s strongly recommended to have your boiler serviced every year.

It may also be a condition of your manufacturer’s warranty or guarantee.

Landlords have additional legal responsibilities. An annual gas safety check is a legal requirement for landlords; a full boiler service is a separate maintenance procedure.

If you rent out a property containing gas appliances, you must ensure relevant gas appliances and flues receive an annual gas safety check carried out by a Gas Safe registered engineer.

The landlord must also provide tenants with a copy of the gas safety record within the required timeframe.

A gas safety check and a boiler service are related, but they are not automatically the same thing.

If you are a landlord, make sure the service you book provides everything required for your property and legal responsibilities.

Do You Need to Service A New Boiler Every Year?

Usually, yes.

Even though a modern boiler should require relatively little attention, most manufacturers require servicing at specified intervals, commonly once every 12 months, as part of their warranty or guarantee conditions. For more details, you can read about how often you should service your boiler.

If you miss a required service, you might lose your warranty coverage.

Check the terms supplied with your boiler to see exactly what your manufacturer requires.

Is A Boiler Service Worth The Cost?

For most households, paying about £100 a year for maintenance is much less than facing an unexpected repair bill.

Regular servicing can help:

• Keep your boiler operating safely
• Identify developing faults
• Reduce the likelihood of unexpected breakdowns
• Maintain manufacturer warranty requirements
• Check that the boiler is operating correctly
• Potentially extend the useful life of the appliance

Of course, servicing doesn’t guarantee your boiler will never break down.

Unfortunately, boilers don’t always cooperate.

But regular inspections give engineers a chance to catch problems before they get worse.

How Can I Keep Boiler Service Costs Down?

Here are some practical ways to avoid paying more than you need to.

Have Your Boiler Serviced Every Year

Skipping a service to save £100 can end up costing more if a hidden problem leads to a major breakdown.

Book Before Winter

Try to book your service in the warmer months instead of waiting for the busy season.

Deal With Problems Early

Don’t ignore leaks, strange noises, pressure loss, or error codes until your next service.

If something seems off, get it checked out.

Compare What Is Actually Included

The lowest price isn’t always the best value.

Check what the engineer will inspect and whether the quoted price includes VAT.

How Much Does WarmZilla Charge for a Boiler Service?

WarmZilla currently offers two straightforward options.

One-Off Boiler Service: £90 Including VAT

You can book a one-off service for £90 including VAT.

Your boiler will be inspected and tested by a Gas Safe registered engineer.

Annual Boiler Service Plan: £8.99 Per Month

Alternatively, WarmZilla’s annual boiler service plan costs £8.99 per month.

This way, you can spread out the cost instead of paying all at once.

Once you have subscribed, you can book your service from 14 days after confirming your subscription.

When Is It Time to Replace Rather Than Service Your Boiler?

Servicing can help keep a boiler healthy.

But it can’t make an old or badly damaged boiler last forever.

If your engineer keeps finding costly faults, parts are hard to find, or your boiler is near the end of its life, replacing it might be more cost-effective than ongoing repairs.

This is especially true if you’re paying for repairs year after year, in addition to your annual service.

WarmZilla’s online boiler survey can help you compare suitable replacement boilers and get a fixed installation price based on your home and heating requirements.

Frequently Asked Questions

Does A Boiler Service Include Repairs?

Not normally. A boiler service is primarily an inspection and maintenance appointment. If the engineer discovers a fault, repairs, replacement components and additional labour may cost extra.

Do Landlords Legally Need An Annual Boiler Service?

Landlords are legally responsible for ensuring relevant gas appliances and flues receive an annual gas safety check from a Gas Safe registered engineer. A gas safety check and a full boiler service are not necessarily the same service.

Who Can Service A Gas Boiler?

Gas boiler servicing should be carried out by a Gas Safe registered engineer who is qualified to work on the relevant appliance.