Updated 25 September 2026
Toilet repair (fill or flush valve) cost UK 2026
The going rate for toilet repair (fill or flush valve) in 2026 is £70–£120/cistern (total, ex VAT). Below: a calculator, what the job involves, materials at three price levels, and the prep that changes the price.
Market band£70–£120/cistern
Worked example, 1 cistern£76
Time on site1 h
Toilet repair (fill or flush valve) calculator
Price a real job freeUses your rates, your speed and your receipts.
Market band source: MyJobQuote.
What the job involves
| Stage | Task | Typical time |
|---|---|---|
| work | Isolate, strip and replace cistern valve | 0.75 h per cistern |
Materials at three price levels
| Material | Budget | Trade choice | Premium |
|---|---|---|---|
| Cistern fill valve each | £4 Flomasta Air Gap Side-Entry Fill Valve 1/2" — Replaces the valve that keeps the cistern filling | £10 Viva Skylo Air Bottom-Entry Fill Valve 1/2" — Replaces the valve that keeps the cistern filling | £14 Fluidmaster Bottom-Entry Brass Shank Fill Valve 1/2" — Replaces the valve that keeps the cistern filling |
Trade prices ex VAT, estimates checked 2026-09-25. Log your receipts in Grafto and your own prices replace these.
What changes the price
- What's wrong with the toilet? keeps filling (fill valve) · keeps running (flush valve) · both big effect
Prep to look for
| Condition | Check | Effect |
|---|---|---|
| No isolation valves | no isolators on WC or tap supplies | Fit isolation valves |
| Hard-water scale | heavy limescale on taps, shower or kettle | Hard water: a scale reducer protects the boiler and taps |
Questions
How much does toilet repair (fill or flush valve) cost in the UK in 2026?
The researched market band is £70–£120/cistern (total, ex VAT), from MyJobQuote. A worked example of 1 cistern comes to about £69–£82 across budget, trade and premium materials.
How long does toilet repair (fill or flush valve) take?
The worked example of 1 cistern takes about 1 hours.
What changes the price of toilet repair (fill or flush valve)?
Mainly what's wrong with the toilet, plus any prep found on site: no isolation valves, hard-water scale.
More plumbing prices
Tap replacementToilet replacementLeak find and fixRadiator installBoiler serviceCombi boiler swapRegular or system to combiBack boiler to combiSystem or regular boiler replacementOil boiler replacementUnvented cylinderPower flushFull central heatingBathroom suite fit (no tiling)Shower installOutside tapKitchen sink replacement