Radiator Repair & Installation — UK-Wide, Qualified & Priced Up Front
Radiators fail politely — a cold bottom here, a weeping valve there — and then a February morning finds three rooms cold. Our your area engineers repair, replace and add radiators with prices fixed before the visit.
Repairs: cold spots, leaks and valves
The common faults and their fixes: cold at the bottom means sludge — the radiator needs flushing or, in bad cases, the system needs a powerflush; cold at the top means trapped air — bleeding cures it, though frequent re-bleeding points to a system fault worth diagnosing; leaks come from valve glands, tail connections or pinholed panels, fixed by re-packing, re-sealing or replacement respectively. A radiator that's cold while its neighbours cook is usually a stuck TRV pin or a balancing issue — both quick work.
Most radiator problems in your area resolve in one visit: bleeding and re-pressurising for air-bound radiators, valve gland repairs for the classic slow drip, TRV head or pin replacements for radiators stuck cold or stuck hot, and tail re-seals where the connection weeps. Panels pinholed by internal corrosion are replaced rather than patched — a pinhole means the steel is finished, and the interesting question becomes whether the system water that caused it is treated or still eating the rest.
Replacement and upgrades
A straight swap onto existing pipe centres is the quick version — typically an hour or two per radiator including new valves. Changing size or style means adjusting pipework; moving a radiator means new routes. Modern double-panel convectors substantially out-perform old single panels of the same width, which is how cold rooms get fixed without bigger boilers. In your area period homes, column radiators do the same job while suiting the room — at a price premium worth knowing before you fall for them.
Upgrading radiators is where comfort per pound is highest: the classic move is single panels to doubles in the coldest rooms, with new thermostatic valves fitted as standard. Every replacement includes fresh valves, a clean connection, re-dosing the system inhibitor and re-balancing so the new radiator doesn't steal flow from its neighbours. Old radiators are removed and disposed of; the price agreed at booking is per-radiator and all-in.
Sludge: the underlying story
Black magnetite sludge is what happens when system water goes untreated: steel radiator interiors corrode, the debris settles in radiator bottoms and low pipe runs, and eventually pumps, valves and boiler heat exchangers suffer. Cold-bottomed radiators across a your area house are the visible symptom. The proper response scales with severity — from dosing inhibitor, through single-radiator flushes, to a full system powerflush — and our powerflush page covers when each is honestly justified.
One sludged radiator is a radiator problem; several are a system problem. The sequence that fixes it for good: clean (flush the affected radiators or the whole system as severity demands), protect (inhibitor at the right concentration), and filter (a magnetic filter on the return, so future debris is caught before the boiler). Skipping straight to a new radiator without treating the water just feeds clean steel to the same corrosion — which is why our engineers test the system water on every radiator job in your area.
Pricing
Typical fixed prices in your area: valve repairs and TRV replacements from £85; a like-for-like radiator swap including new valves from around £150–£250 supplied and fitted depending on size; additions and relocations quoted after a quick survey because pipe routes drive the cost. Multiple radiators in one visit price keenly — the travel and setup are shared — so batch the whole house's grumbles into one appointment.
Radiator work prices cleanly because the scope is knowable: from £85 for valve and TRV work, fixed per-radiator prices for swaps agreed at booking, and surveyed quotes for moves and additions. The only honest variable is what the system water reveals — if the engineer finds sludge or dead inhibitor, you'll get a separate recommendation and price for treating it, not a padded radiator bill.
| Item | Guide |
|---|---|
| Typical price band | £85–£350 |
| Pricing basis | fixed price per radiator agreed at booking; valve repairs priced lower |
| Typical timescale | 1–2 hours |
| Funnel | Attendance and diagnosis |
| Credentials | Qualified heating engineer |
Frequently asked questions
Why is my radiator cold at the bottom?
Sludge — corrosion debris settled inside the panel, blocking circulation across the bottom. One radiator can be removed and flushed; several cold-bottomed radiators suggest the system needs cleansing and inhibitor, possibly a powerflush. Bleeding won't help; that's for cold tops.
Why is my radiator cold at the top?
Trapped air. Bleeding the radiator releases it — a minute's job with a bleed key, then re-check the boiler pressure and top up via the filling loop if it's dropped. If the same radiator needs bleeding every few weeks, air is getting in or being generated somewhere, and that's worth diagnosing.
How much does it cost to replace a radiator in your area?
A like-for-like swap onto existing pipework, including new valves, typically runs £150–£250 supplied and fitted depending on radiator size and spec. Column and designer radiators cost more for the metal, not the labour. Prices are fixed at booking.
Can you move a radiator to another wall?
Yes — it's routine, priced after a quick look at the pipe route. Under-floor access makes it cheap; solid floors or finished rooms make it dearer. The engineer will tell you honestly if the route makes it poor value.
Do I need to replace radiators when I get a new boiler?
Only if they're undersized, sludged beyond economic flushing, or corroded. Sound radiators serve a new boiler perfectly well once the system is cleansed and inhibited. Anyone insisting on wholesale replacement without a reason per radiator is selling, not surveying.
What are TRVs and are they worth it?
Thermostatic radiator valves let each radiator hold its own room temperature — cheap to fit, and they stop bedrooms overheating all evening. Current standards expect them on most radiators in new and replacement systems. Our TRV guide covers choosing and using them.
My radiator valve is leaking — is that urgent?
It's urgent-ish: a slow gland leak wets carpet and drops boiler pressure but rarely floods. Put a container under it, top up the boiler pressure if needed, and book promptly. A valve spraying rather than weeping is a call-now situation — isolate both radiator valves and phone.
One radiator won't heat but the rest do — why?
Usually a stuck TRV pin (freed in minutes), a closed lockshield, or the system out of balance so the farthest radiator starves. All are quick fixes for an engineer. If that radiator is also the newest, balancing is the likely story.
Do new radiators come with a guarantee?
Yes — manufacturer warranties on the radiators themselves plus the engineer's workmanship guarantee on the installation. Keeping the system inhibited is the condition that matters: corrosion from untreated water is the one failure warranties won't cover.