Heating · Updated August 2026
Underfloor Heating Repair Cost UK 2026: Priced by Fault
Most wet UFH repairs cost £150–£600: diagnostics run £100–£250, manifold parts (actuators, valves, pump) £150–£600 fitted, and tracing plus repairing a genuine pipe leak £300–£1,200. The good news: cold zones are usually the manifold, not the floor.
UFH repair cost by fault — 2026
Wet (water) systems. Electric mat faults are a different trade - an electrician with a fault-finder.
| Fault / job | Typical cost | Timescale | Notes |
|---|---|---|---|
| Diagnostic visit | £100–£250 | 1–2 hours | Flow, pressure and manifold checks |
| Actuator or zone valve replacement | £150–£300 | same visit | The most common cold-zone fix |
| Manifold pump replacement | £250–£600 | half day | Whole system lukewarm points here |
| System flush (sludged loops) | £300–£600 | half–full day | Restores flow through starved loops |
| Leak trace + repair (screed floor) | £300–£1,200 | 1–2 days | Thermal imaging finds it; one tile lifts |
Indicative 2026 UK prices, compiled from published installer pricing (Checkatrade, MyJobQuote, MyBuilder and BookaBuilder cost guides, August 2026). BestBuilders has no quote history in this category yet, so treat these as a budgeting guide and confirm against three written quotes.
What changes the cost
| Cost factor | Typical impact | Why it matters |
|---|---|---|
| Where the fault is | manifold vs floor | Ninety percent of faults live at the manifold, in the open, priced in hours - floor work is the expensive minority |
| Floor construction | ±£300–£600 | A leak under screed and tile costs more to reach than under a floating floor |
| System age and records | ±£100 | A labelled manifold and a layout drawing halve diagnostic time - keep both |
| Water quality | flush or not | Sludged, inhibitor-free systems block their coldest loop first; a flush plus inhibitor stops the sequel |
| Parts availability | ±£50–£150 | Obsolete manifold brands mean adapting standard parts rather than clipping in replacements |
UFH repair cost by UK region — 2026
Modelled from regional labour rates rather than measured in this category — materials cost much the same everywhere, the labour does not.
| Region | Typical cost | vs UK average |
|---|---|---|
| London | £190–£780 | +25–30% |
| South East | £170–£720 | +15–20% |
| South West | £160–£630 | +5% |
| Midlands | £150–£600 | baseline |
| North England | £140–£570 | −5–10% |
| Scotland | £140–£540 | −10% |
| Wales | £140–£540 | −10% |
| Northern Ireland | £130–£510 | −15% |
Getting it priced properly
1. Describe symptoms precisely
One cold room, all rooms lukewarm, or pressure dropping - each points at a different component, and a good firm quotes differently for each.
2. Ask for thermal imaging on leaks
Nobody should open a screed floor on a guess. Imaging finds the leak to within a tile.
3. Add inhibitor at every repair
Whatever the fault was, sludge made it worse. The £20 of inhibitor at the end of the visit is the cheapest part of the job.
What this costs at a glance
The same table, drawn.
Underfloor heating repair — frequently asked questions
Usually a failed actuator or stuck valve on that loop at the manifold - a £150–£300 fix. Genuine pipe damage in the floor is rare unless someone has drilled or screwed into it.
Thermal-imaging leak tracing plus the repair typically runs £300–£1,200 on a screeded floor. Falling boiler pressure with no visible leak is the classic symptom.
The pipe repair itself needs access to the damaged spot - but imaging pinpoints it so one tile or board comes up, not the room. Manifold-end faults need no floor work at all.
If loops are starved and the water runs grey, yes - £300–£600 restores flow and protects the new parts you have just paid for. Add inhibitor after any repair.
Related cost guides
New UFH priced per m2, wet and electric.
Combi, system and heat-only swaps priced.
Vented and unvented cylinders priced.
Reviewed by the BestBuilders editorial team on 18 August 2026 · Next scheduled review: November 2026 · See our editorial standards.