How much does it cost to rewire a house in Northern Ireland?
For a typical 3-bed semi or terrace in Northern Ireland, a full rewire runs £4,500 to £8,500 in 2026, with an Electrical Installation Certificate on completion. A 2-bed terrace runs £4,000 to £6,500, a 4-bed detached £6,500 to £11,500, and large or period properties £9,500 to £16,500. NI prices sit roughly 10 to 20 per cent below GB averages, so UK-wide guides overshoot here.
The honest headline range for Northern Ireland in 2026: a full rewire of a 3-bed semi or terrace typically costs £4,500 to £8,500 and takes 5 to 8 days. Smaller homes cost less (a 2-bed terrace or flat, £4,000 to £6,500), bigger ones more (4-bed detached, £6,500 to £11,500; large rural or period properties, £9,500 to £16,500). Partial rewires, where the wiring is sound but the consumer unit and key circuits need replacing, run meaningfully cheaper, and our full rewire guide breaks both down by property type.
If you searched for a rewiring cost calculator, two warnings before you trust one. Most calculators online are built on GB pricing, and NI trade rates run roughly 10 to 20 per cent below the GB mainland, so they quietly overshoot. And all-Ireland results mix in euro pricing from the Republic, which follows a different market again. Our free Quote Checker works as an NI-specific version: pick the rewire job, choose your property size, and see the researched 2026 NI range, or enter a quote you have already received and see where it sits in 30 seconds.
What moves the price inside those ranges: the making-good. The wiring itself is only part of a rewire; chasing cables into walls means plastering, redecorating and flooring afterwards, and quotes differ most in how much of that reinstatement they include. Always ask whether plastering and making-good are in the price, it is the single most common source of a "cheap" rewire quote growing later.
Whoever you hire, the paperwork is not optional: a rewire should finish with an Electrical Installation Certificate to BS 7671 from a NICEIC or NAPIT registered electrician. That certificate is what your insurer and a future buyer’s solicitor will ask for, and an uncertified rewire is a deferred cost, not a saving. Post the job free on NI Trades and up to three vetted local electricians will quote it, which is also the fastest way to test the ranges above against your actual house.
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NI Trades content is produced by a founder-led research desk in Northern Ireland: figures are compiled from written NI quotes and official published sources, drafted with the help of AI tools as disclosed in our editorial standards, then checked against the cited primary sources before publishing. Every page carries its sources and review date, and corrections are made fast when readers or tradespeople spot an error.