How much does a boiler service cost in Northern Ireland? (2026 guide)

Boiler servicing is one of those jobs where prices vary more than homeowners expect — and where a cheaper quote doesn't always mean better value. Here's what you should realistically expect to pay across Northern Ireland in 2026, and what a proper annual service actually involves.

Typical boiler service costs in NI

For a standard combi boiler in a residential property, most reputable heating companies in Belfast, Bangor, Lisburn, and the wider North Down area charge somewhere between £60 and £100 for an annual gas service.

That figure covers a like-for-like inspection of a reasonably accessible, well-maintained boiler — no repairs, no parts, no surprises.

Where prices vary:

Job type	Typical NI price range
Standard combi service (gas)	£60–£100
System or heat-only boiler service	£75–£110
Oil boiler service (OFTEC)	£80–£130
Landlord gas safety certificate + service	£90–£130
Service + minor repair in same visit	Quoted separately

Prices at the lower end of these ranges often reflect a quicker, less thorough inspection. At the higher end, you're typically getting more time on site, better documentation, and an engineer who flags wear before it becomes a breakdown.

What a proper boiler service includes

A thorough annual service should cover:

• Flue integrity check — confirming combustion gases are venting safely
• Burner and heat exchanger inspection — checking for scaling, cracking, or sooting
• Ignition and flame picture assessment — ensuring clean, efficient combustion
• Gas pressure and rate check — confirming the boiler is running within manufacturer tolerances
• Safety device testing — overheat thermostats, pressure relief valves
• Condensate and sump inspection — particularly important in older boilers
• Visual check of pipework and connections — looking for corrosion or loose joints
• Controls and thermostat check — verifying the system responds correctly

At the end, you should receive a written record — a service sheet — that logs what was checked and any observations. Landlords need this as part of their legal documentation; homeowners benefit from it as a maintenance record that adds value when selling.

What a service does NOT include

Servicing is preventative, not a repair. If an engineer finds a faulty part during a service, that's a separate job — with a separate cost. A good engineer will stop, explain what they've found, and give you options before proceeding.

If a company quotes a very low service price and then calls you mid-job with parts costs you hadn't agreed to, that's worth treating with caution.

Oil boiler servicing in NI

Properties across Newtownards, Comber, and the wider Ards Peninsula often run on oil rather than mains gas. Oil servicing is a different procedure — it requires an engineer with OFTEC competencies, and typically involves cleaning the burner nozzle and filter, checking the fuel line, and inspecting the flue.

Oil services tend to run slightly more expensive than gas, reflecting the additional work and the OFTEC qualification requirements. Always confirm your fuel type when booking.

How often do you need a boiler service?

Once a year, as a minimum. Most boiler warranties require documented annual servicing to remain valid — if you skip a year and then make a warranty claim, the manufacturer can refuse it.

A winter service (September–November) is ideal timing — you want the boiler properly checked before the months when it's working hardest. If your boiler hasn't been serviced in more than 12 months, book it before the cold weather arrives.

Booking a boiler service with HeatNI

If you're in Belfast, Bangor, Lisburn, Newtownards, Holywood, Dundonald, Comber, or Donaghadee — book a callback with your postcode, boiler make and model if you know it, and when you'd like the work done. We'll confirm availability when we call.

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Prices are indicative for 2026 based on typical NI market rates and will vary by property and engineer. Always confirm the full scope of what's included before booking.