New Boiler Installation in Islington
Swapping like-for-like — combi for combi in the same spot — is the economical end of the range; relocating the boiler, converting from a cylinder system to a combi, or upsizing for a loft conversion moves the price up. We'll always show you which parts of the quote are which.
What a new boiler costs
Expect £1,800–£2,800 for a straightforward combi replacement in the same location, more for conversions and relocations. The quote should always include: the boiler and flue, a magnetic filter, updated controls to current regulation, a chemical cleanse (or powerflush where sludge demands it), condensate connection, commissioning with benchmark record, and building-control notification. If a Islington quote is dramatically cheaper than the band, check which of those it quietly omits.
What happens on installation day
Day one, the outgoing boiler comes off and the new one goes up: flue, condensate, gas and water connections made, the system flushed and dosed, filter and controls fitted. Commissioning is the part that separates professionals — combustion analysed, gas rate verified, the benchmark log completed and building control notified. You end the day with a working system, a registered warranty and paperwork that will matter when you sell the house.
Warranties, paperwork and aftercare
The boxes that must be ticked: warranty registered with the manufacturer within the deadline, building-control notification lodged (the Gas Safe notification handles this for gas installs), benchmark commissioning record completed in the boiler's log, and your first annual service booked eleven-ish months out to keep the warranty alive. Network installers do all four as standard — it's a condition of taking installation work through us.
One thing worth knowing about boiler installation & replacement in Islington: the age profile of the local housing stock shapes what engineers find behind the cupboard door. Islington's Georgian and Victorian terraces — Barnsbury, Canonbury, Highbury — are overwhelmingly divided into flats, so stacked services, shared stopcocks and neighbourly leak diplomacy are standard features of the work. That matters because a system's history determines whether a job is a straightforward hour or something that needs the pipework conversation first.
Frequently asked questions
How much is a new boiler in Islington?
Most Islington combi replacements land between £1,800 and £2,800 installed; conversions and system-boiler installs range higher, typically £2,500–£4,500. Your fixed quote follows a survey — the quote form on this page captures what the surveyor needs to price accurately.
How long does a boiler installation take?
A like-for-like combi swap: usually one day. A conversion from cylinder system to combi, or a relocation: two to three days. You'll be told the expected duration with the quote, and the heating is commissioned and working before the installer leaves.
Which boiler brand should I choose?
The honest answer: any of the major brands at the right size, installed well, will serve you. Differences lie in warranty length, parts availability and price tier. Our brand hub compares them factually — and a good installation matters more than the badge.
What size boiler do I need?
Size follows demand, not house pride: bedroom and bathroom count, radiator count and mains flow rate determine it. Oversizing wastes money and cycles the boiler; undersizing disappoints at the shower. The quote survey calculates it — our sizing guide explains the logic.