Re-plumbing a house Cost Calculator
A full re-plumb in 2026 UK costs £4,500–£9,500 for a typical 3-bed semi, £8,000–£18,000 for a 4–5 bed detached. Plastic push-fit (PEX) is now the default — it cuts labour by around 30% versus copper and is what 8 in 10 reputable installers…
Open the calculator →How this calculator works
Every figure in this calculator is the one published in the cost table on our re-plumbing a house guide. Pick the option that matches your job and the calculator returns that published range, adjusted for your region - it does not model anything the guide does not already say.
That is deliberate. A calculator whose rates drift from the page it sits under is worse than no calculator, because two numbers on the same site disagree.
What it cannot know: access, the condition of what is already there, and anything structural. Those are what separate three real quotes from each other.
Published re-plumbing a house costs (2026)
| Option | Typical 2026 cost | Notes |
|---|---|---|
| 1-2 bed flat | £2,800–£5,200 | |
| 2-bed terrace | £3,500–£6,800 | |
| 3-bed semi | £4,500–£9,500 | |
| 4-bed detached | £7,500–£14,000 | |
| 5-bed / 2-bath detached | £10,000–£18,000 |
These are the figures from our re-plumbing a house cost guide.
What actually moves a re-plumbing price
A re-plumb is priced on how far the pipework has to travel and how much of the house has to come apart to reach it, not on the number of taps. The pipe and fittings are a small share of the bill; most of what you pay is the plumber's time, plus making good afterwards. Our guide to what plumbers charge per hour shows the day and hourly rates that sit under every figure here.
The big swings come from access and disruption. A ground-floor flat with a straight run to the boiler is quick. A three-storey house where pipes run under suspended timber floors, through joists and up chases in solid walls takes far longer, and floorboards, plaster and tiling all have to be lifted and reinstated. Adding a second bathroom, moving the kitchen, or switching from an old gravity system to a pressurised unvented cylinder all pile on pipework and labour.
Some things only surface once the floor is up: asbestos in older textured coatings or floor tiles, a lead supply pipe that really ought to be replaced, or a boiler that has to be moved to make the new layout work. Whether you re-plumb in one hit or stage it around other work also shifts the price. For a room-by-room sense of where the hours go, our guide to what a plumbing job costs breaks it down.
Re-plumbing a house calculator — FAQs
It uses the same published figures as the cost guide it sits under, adjusted for your region. It is a budgeting estimate, not a quote - only a site visit produces one of those.
Usually yes, though expect stretches with the water off while connections are made. A good plumber isolates and reconnects section by section so you are rarely without water overnight, and should tell you at the quote stage which days the kitchen or a bathroom will be out of use. On a full re-plumb of an occupied house it is the disruption, not the plumbing itself, that most people underestimate.
Push-fit plastic (PEX) is the default on most re-plumbs now because it is faster to run, which is where the labour saving comes from, and it copes well with hidden runs under floors. Copper still earns its place on exposed pipework and near the boiler, where heat and looks matter. Plenty of plumbers mix the two - plastic for the concealed runs, copper for the visible connections.
Related cost guides
- Re-plumbing a house cost guide — The full price guide
- All plumbing services — Browse the hub
- All BestBuilders services — Every trade we cover
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