Stopcock Replacement Cost
£100–£250
typical UK range
Updated
Replacing a stopcock (also called a stop valve) in the UK costs £100–£250 for an accessible internal stopcock. The job involves isolating the supply, cutting out the old valve, and fitting a new one — typically under 2 hours for an experienced plumber.
Find a plumber
How much does each option cost?
| Type / scope | Typical cost | Notes |
|---|---|---|
| Internal stopcock replacement (accessible location)Most common job — replacing the main stopcock under the kitchen sink or in an accessible location | £100–£200 | Most common job — replacing the main stopcock under the kitchen sink or in an accessible location |
| Stopcock in difficult location (under floor, behind panel)Additional access time and possible reinstatement work for less accessible stopcocks | £180–£350 | Additional access time and possible reinstatement work for less accessible stopcocks |
| Stopcock with new isolation valves fittedAdding new isolation valves to key appliances (washing machine, dishwasher) at the same visit | £150–£280 | Adding new isolation valves to key appliances (washing machine, dishwasher) at the same visit |
| External stop tap (outside your boundary)This is the water company's property and responsibility — call your water company for external stop tap problems. They repair it free of charge. | £0–£0 | This is the water company's property and responsibility — call your water company for external stop tap problems. They repair it free of charge. |
What affects the price?
- Location of the stopcock — an accessible stopcock under the kitchen sink is cheapest; those in under-floor voids, within wall cavities, or in awkward locations cost more
- Type of replacement valve — a standard brass stopcock is cheapest; a quarter-turn ball valve is more expensive but easier to use
- Whether the water can be isolated upstream — if the internal stopcock can't be turned off and the plumber must work with the mains live until the water company's stop tap is turned off, it adds complexity
- Age and condition of pipework — very old copper or lead pipework may need additional work to fit a new valve without disturbing adjacent joints
- Location — London and South East rates are 20–30% higher
What's included in the price?
- Isolation of the water supply
- Removal of the old stopcock
- Supply and fitting of a new stopcock or ball valve
- Testing the new valve operation and checking for leaks
- Restoring the water supply to the property
How long does it take?
An accessible stopcock replacement takes 45 minutes to 1.5 hours. A less accessible stopcock may take 2–3 hours including gaining access and reinstating any panels or floor sections. The water will be off throughout the replacement, which typically causes no inconvenience if it takes under an hour.
Do I need one?
Your internal stopcock is one of the most important components in your home's plumbing — it's how you shut off the entire water supply in an emergency (burst pipe, appliance failure, water leak). If your stopcock is stiff, seized, or leaking at the valve body, it needs replacing. A stopcock that cannot be fully closed is a liability — in a plumbing emergency, every second counts. Many homes have stopcocks that haven't been tested for years; it's worth checking yours works before you need it in an emergency.
How do you avoid overpaying?
- Combine stopcock replacement with other plumbing work to avoid a separate callout fee
- A quarter-turn ball valve costs slightly more than a traditional stopcock but is easier to operate and more reliable in the long term
- If your stopcock is just stiff (not seized), a plumber can often free it with penetrating lubricant and careful operation — check this before agreeing to a full replacement
Ready to get it done?
Compare local plumbers — coverage areas, accreditations and phone numbers, no middleman.
Frequently asked questions
We’re happy to answer all your questions.
How much does it cost to replace a stopcock in the UK?
Replacing an internal stopcock costs £100–£200 for an accessible location. More difficult access (under floor, behind panels) costs £180–£350. The job typically takes under 2 hours.
Where is the stopcock in my house?
The internal stopcock is most commonly found under the kitchen sink, in the utility room, or near where the mains water pipe enters the property. In older properties it may be in a downstairs cupboard or under the stairs. Look for a small brass valve on the incoming water pipe — it often has a flat head that you turn clockwise to shut off the water.
What is the difference between a stopcock and a stop tap?
The terms are used interchangeably in the UK. A stopcock (or stop valve) controls the water supply within your property. The external stop tap is outside your property boundary (typically in the pavement in a small chamber) and controls the supply from the main — this belongs to the water company, not you.
Can I replace a stopcock myself?
Technically yes, if you can isolate the supply upstream (via the external stop tap). However, working on the mains supply requires care — the supply must be fully isolated before cutting into the pipework. An error with the supply under pressure can flood your home quickly. Most homeowners are better served by a plumber for this job.
Sources & References
Need a plumber?
Compare local plumbers on Tradehand — coverage areas, accreditations and phone numbers, no middleman.
Find a plumber