Boiler Installation Northern Ireland
Professional Gas & Oil Specialists — Gas Safe & OFTEC Registered
The JobDoneNI Difference
Most companies use sub-contractors and generic one-size-fits-all quotes. Led by Mark Gunda, we provide specialised local expertise tailored to the specific infrastructure of Northern Ireland.
📍 Local Experts
Accredited for Phoenix Natural Gas, firmus energy, and SGN Natural Gas networks.
🛡️ Hard Water Protection
Installations in Belfast and Lisburn include magnetic filters and scale inhibitors as standard.
⚙️ Conversion Pros
Full oil-to-gas transitions managed from tank removal to building control notification.
💰 No-Nonsense Pricing
We don’t do “starting from” traps. You get a fixed, transparent quote every time.
NI Boiler Installation Price Guide (2026)
Prices include VAT, A-rated boiler, filter, and system flush.
| Service Type | Estimated Cost | Typical Timescale |
|---|---|---|
| Gas Combi Swap Standard A-Rated Efficiency |
£1,800 – £2,600 | 1 day |
| Oil-to-Gas Conversion Full transition (Phoenix/firmus) |
£2,800 – £4,200 | 2 to 3 days |
| Oil Boiler Replacement Condensing Models (OFTEC) |
£2,400 – £3,500 | 1 to 2 days |
| System Upgrade Controls, Filter & Flush |
£450 – £800 | Half day |
*Prices are indicative. Final quote provided after site survey.
What’s Included in Every JobDoneNI Install?
Chemical System Flush: We clear the sludge from your radiators to protect your new boiler.
Magnetic System Filter: Prevents debris from reaching your new heat exchanger.
Digital/Smart Controls: Professional setup of Nest, Hive, or Tado for ErP compliance.
Building Control Guidance: We walk you through the notification process and make sure you have all the documentation you need on completion.
Boiler Installation by Region
We cover the greater Belfast area and beyond. Select your area below for local pricing, coverage details, and area-specific information.
🔥 Belfast
Phoenix Natural Gas network. Hard water protection included as standard across Greater Belfast.
🔥 Lisburn and Castlereagh
Phoenix network. Covering Lisburn city, Carryduff, Hillsborough, Moira, and surrounding areas.
🔥 Derry/Londonderry
SGN Natural Gas network. Gas and oil installations across the city and wider north west.
🔥 Newry, Mourne and Down
firmus energy network. Gas in Newry, oil across rural Down and Mourne. Both covered.
🔥 Antrim and Newtownabbey
Phoenix network. Covering the full M2 corridor from Glengormley to Antrim town.
🔥 Ards and North Down
Phoenix network for Bangor and Newtownards. Oil installations along the Ards Peninsula.
🔥 Mid and East Antrim
firmus energy on the coast. Oil across rural Mid Antrim including the Glens of Antrim.
“I treat every home like my own. When I leave, the system is efficient, the house is clean, and the job is done.”
Mark Gunda, Gas Safe Certified Installer
Boiler Installation FAQs
A straight swap (combi-for-combi) typically takes one day. Oil-to-gas conversions or more complex system changes may take two to three days depending on pipework and access.
Costs vary depending on the type of installation. A gas combi swap generally falls between £1,800 and £2,600 including the boiler, filter, and system flush. Oil boiler replacements and oil-to-gas conversions cost more. See our price guide above for a full breakdown.
Yes. In Northern Ireland, boiler installations must be notified to your local council’s building control department. We will walk you through the process and make sure you know exactly what is required and what documentation to expect on completion.
A combi boiler heats water on demand and doesn’t need a hot water cylinder, making it ideal for smaller homes with one bathroom. A system boiler works with a cylinder and suits larger homes or properties with higher hot water demand.
Mains natural gas is available through Phoenix Natural Gas (Greater Belfast), firmus energy (around 40 towns across NI), and SGN Natural Gas (parts of the north west). If your property isn’t connected, we can advise on oil boiler options or discuss whether a connection is feasible.
Yes. We work with private landlords across Northern Ireland. Installations are carried out by Gas Safe and OFTEC registered engineers, and we can provide the documentation your tenants and letting agent will need.
Call Mark directly on 07984 433834. We’ll arrange a site survey and give you a fixed price. No vague estimates, no hidden costs.
Ready for a Warmer Home?
Don’t wait for a breakdown. Get a fixed-price survey today.
Call Mark: 07984 433834Need something else? We offer more than just installations.
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