Radiator leak repair cost in the UK
Fixing a radiator leak in the UK costs £60 to £150 for a valve repair, £90 to £220 if a valve needs replacing, and £180 to £400 if the radiator itself has to go.
Which one you're looking at depends entirely on where the leak is. A leak at a fitting is a cheap job. A leak from the radiator body means corrosion, and corrosion doesn't get repaired.
Radiator leak repair costs at a glance
| Job | Typical cost | Time |
| Tighten a leaking valve | £60 – £100 | 30 min |
| Re-pack a valve gland | £80 – £120 | 45 min |
| Replace one radiator valve | £90 – £150 | 1 hour |
| Replace both valves | £140 – £220 | 1.5 hours |
| Replace a compression fitting | £80 – £140 | 1 hour |
| Replace the radiator | £180 – £400 | 2 hours |
| Emergency or out-of-hours call-out | £150 – £300 | — |
Most of these are minimum-charge jobs. A plumber's first hour costs the same whether the work takes ten minutes or fifty, so it's worth having anything else that needs doing ready at the same visit.
Prices checked August 2026
What affects the price
- Where the leak is — a valve is accessible, a corroded pipe under a floor is not
- Whether the system needs draining — adds an hour or more
- Location — London and the South East run 20–30% above the national average
- Time of day — evening, weekend and emergency rates roughly double
- Radiator cost if replacing — £50 for a basic panel, £300+ for a designer or column model
- Access — boxed-in pipework or a radiator behind fitted furniture adds time
Draining is the one that moves the price most. Tightening a nut takes minutes. Replacing a valve means isolating and draining that part of the system, refilling it, rebalancing, and re-pressurising the boiler.
Repair or replace?
The rule is straightforward: if the leak is at a fitting, repair it. If it's from the radiator body, replace it.
A pinhole in the panel means the steel has corroded from the inside out. Where one appears, others are forming. Patching or sealing buys months at best.
| Situation | Do this | Cost |
|---|---|---|
| Leak at valve or joint | Repair | £60 – £220 |
| Pinhole in the body | Replace the radiator | £180 – £400 |
| Multiple radiators pinholing | Replace + flush + inhibitor | £600+ |
| Radiator over 20 years old, leaking | Replace | £180 – £400 |
If more than one radiator has started weeping, the problem isn't the radiators — it's the system water. Replacing them without flushing and adding inhibitor means doing it again in a few years.
Can you do it yourself?
Some of it, and the savings are real.
Tightening a union nut costs nothing and fixes a good share of valve leaks. Two adjustable spanners, a quarter turn, done. That's a £60 to £100 job avoided.
Replacing a bleed plug is a few pounds and twenty minutes, once both valves are closed.
Replacing a valve means draining part of the system, and getting it wrong means water across the floor rather than a slow drip. Most people should pay for this one.
Replacing a radiator is a two-person job involving draining, lifting a panel full of water, and rebalancing afterwards. Feasible if you've done plumbing before, expensive if you haven't.
Insurance and getting quotes
Home insurance rarely covers the leak itself — that's wear and tear. What it often does cover is the damage the leak caused: ruined flooring, a stained ceiling, damage to what's below.
Worth checking your policy before assuming either way, and photographing the damage before anything gets cleaned up.
For quotes, three is the sensible number. Ask each one whether the price includes draining and refilling, and whether the radiator is included if replacement is likely. Quotes that look wildly different usually differ on those two points rather than on labour.
More radiator problems
Prices depend on what's actually wrong. These guides help you work that out before you call anyone.
Frequently asked questions
How much does it cost to fix a radiator leak?
£60 to £150 for a valve repair, £90 to £220 to replace a valve, and £180 to £400 if the radiator needs replacing.
Is it cheaper to repair or replace a radiator?
Repair, if the leak is at a fitting. If the radiator body is leaking, replacement is the only real option — corrosion can't be patched.
Will home insurance cover a radiator leak?
Usually not the repair itself, but often the resulting damage to floors and ceilings. Check your policy wording and photograph everything before cleaning up.
How long does a radiator leak repair take?
Tightening a valve takes half an hour. Replacing a valve takes about an hour. Replacing a radiator takes around two.
Do I need to drain the system?
Not to tighten a fitting. Yes to replace a valve or a radiator, which is why those jobs cost more.
How much does an emergency plumber cost?
£150 to £300 for a call-out. Isolating the radiator by closing both valves usually turns an emergency into a normal appointment.