Radiator Replacement Costs UK — What to Charge to Swap a Radiator in 2026

The Three Types of Radiator Job

Before you price anything, work out which of these you're actually being asked to do — because the labour difference between them is huge. Customers often describe all three as "just changing a radiator", but your quote needs to reflect the real scope.

1. Like-for-Like Swap (Same Size, Same Position)

This is the quickest job. The new radiator is the same height, length and valve centres as the old one, and it goes back exactly where the old one came off. No new pipework, no moving brackets more than a few millimetres, no chasing walls. You drain the rad (or isolate and freeze the pipes), unbolt the old one, fit the new brackets, hang the new rad, reconnect, bleed and balance.

On a system with healthy valves and decent access, a competent engineer does this in 1–2 hours. The main risk is seized old valves that won't isolate — budget for that possibility rather than assuming a clean drain-down.

• Labour only (customer supplies rad): £120–£250
• Supply and fit (single panel rad included): £180–£350
• Supply and fit (double convector or larger): £220–£450

2. Different Size or Type (Same Position)

The rad goes back in roughly the same spot, but it's a different size or style — for example a taller, shorter or more powerful replacement, or a switch from a standard panel rad to a column or vertical designer model. This almost always means adjusting the pipework. The valve centres rarely line up, so you'll be re-running tails, fitting new isolation points, and often dropping or extending the feed and return.

It also means a heat-output check. If the customer is upsizing because the room is cold, you should confirm the new rad is actually correctly sized for the room and not just bigger for the sake of it — and that the existing pipework and pump can deliver the extra output.

• Labour with pipework adjustment: £200–£400
• Supply and fit (mid-range designer/vertical rad): £350–£700

3. Moving or Adding a Radiator

This is a different job entirely. Moving a radiator to a new wall — or adding one where there wasn't one before — means running new pipework from the existing circuit, often lifting floorboards or chasing through joists, and possibly cutting into a chipboard or solid floor. You may need to find a convenient tee on the flow and return, balance the rest of the system around the new load, and make good afterwards.

Time varies enormously with floor type and access. A suspended timber floor with a loft above is straightforward; a screeded solid floor or a finished room with no easy route is a half-day or more. Always survey before quoting — never price this off a phone call.

• Move an existing radiator (short distance, accessible floor): £250–£450
• Add a new radiator to an existing system: £350–£600
• Complex runs (solid floors, long pipe routes, awkward access): £600+

Radiator Types and Supply Prices

If you're supplying the radiator, your margin and your quote both depend on knowing trade prices. These are typical 2026 UK trade-counter prices for a mid-range domestic radiator — round figures, before any merchant discount you negotiate.

• Single panel (Type 11): the slimmest standard rad, lowest output. £35–£80 depending on size.
• Double panel convector (Type 22): the workhorse of UK heating — two panels, two convector fins, good output for the wall space. £55–£140.
• Double panel plus convector (Type 21 / P+): a middle ground where wall depth matters. £50–£120.
• Column radiators: traditional cast-iron look in steel, popular in period properties. £120–£400+ depending on height and columns.
• Designer / vertical radiators: tall flat-panel or feature rads for hallways and kitchens. £150–£600+, and anthracite/coloured finishes cost more than white.
• Towel rails (heated): ladder-style chrome or anthracite for bathrooms. £60–£250, with chrome generally lower output than coloured or flat-panel versions.

Always confirm the heat output (in watts or BTUs) against the room requirement, not just the physical size. A chrome towel rail in particular often under-delivers — many bathrooms need a supplementary rad or a higher-output model to actually heat the room.

Valves: Manual, TRVs, Lockshield and Smart

Every radiator needs two valves — and a swap is the natural moment to replace tired ones. A standard pairing is a control valve on the flow and a lockshield on the return for balancing. The control valve is either a manual wheelhead or a thermostatic radiator valve (TRV).

• Manual valve + lockshield pair: £8–£20 supply. Cheap and simple, no room-by-room temperature control.
• TRV + lockshield pair: £15–£45 supply. Lets the customer set per-room temperatures and is expected on most modern installs.
• Smart TRVs: £40–£80 each. Wireless thermostatic heads that link to a hub or app (Hive, tado°, Drayton Wiser and similar). A growing upsell, especially for customers already running a smart thermostat.

Allow extra labour if you're changing valves as well as the rad — particularly if the old valves are seized to the pipe tails, which often means cutting back and re-making the connection. Quote valves as a separate line so the customer sees the choice and you don't absorb the cost of an upgrade they assumed was included.

The Work Involved in a Swap

Pricing accurately means costing the actual steps, not just "take one off, put one on". A typical like-for-like swap runs like this:

• Isolate the radiator — close the valves, or if you're working on a sealed system or the valves won't hold, drain down or use pipe-freezing kit to localise the job.
• Drain and remove the old rad — catch the water (old radiator water is filthy), lift the rad off its brackets and get it out without staining carpets.
• Fit new brackets and hang the new rad — set the brackets to the new rad's fixing centres, check it's level, and hang it.
• Reconnect and refill — connect the tails to the valves, re-pressurise or top up, and check for leaks.
• Bleed and balance — vent the air, then balance the rad against the rest of the system using the lockshield so it heats evenly.
• Add inhibitor — top up the corrosion inhibitor, especially if you've drained any volume from the system.

Using a pipe-freezing kit instead of a full drain-down saves time on a single-rad swap and avoids disturbing inhibitor levels across the whole system. Many engineers build the cost of freezing spray into the swap price because it pays for itself in saved labour and a cleaner job.

Sludge, Power Flushing and System Health

When you take an old radiator off, you'll often see the problem the customer didn't know they had: black, gritty magnetite sludge. If the existing rads are cold at the bottom, the water draining out is filthy, or there's no functioning magnetic filter, the system is sludged — and a single rad swap won't fix the underlying issue.

This is the moment to recommend a power flush or, at minimum, a chemical flush and a magnetic filter. A power flush forces cleaning chemicals and water through the system at high velocity to break up and remove sludge, protecting the new rad and improving the heating across the whole property. It's also a legitimate, well-margined upsell that genuinely benefits the customer.

• Power flush (typical 6–10 rad system): £400–£700
• Larger systems (10+ rads): £600–£1,000+
• Magnetic filter supply and fit: £120–£250

Be honest about whether a flush is needed — recommending one on a clean system damages trust. But where the evidence is in front of you, document it (a photo of the sludge draining out is worth a thousand words) and quote it as an optional line so the customer can decide.

Boiler and System Pressure

On a sealed system — which is most modern combi and system-boiler setups — draining a rad drops the pressure, so you'll need to re-pressurise via the filling loop and bleed air through afterwards. Check the boiler pressure gauge reads correctly (typically around 1–1.5 bar cold) before you leave, and that the expansion vessel and pressure relief valve are behaving.

On an open-vented system with a feed-and-expansion tank in the loft, refilling is more forgiving, but you still want to confirm the system fills cleanly and the new rad heats through. Either way, leave the customer with a working, balanced system and the inhibitor topped up — a callback for a cold rad or a slow leak costs you far more than the few minutes it takes to check properly.

What Affects the Price

Two radiator swaps can be priced hundreds of pounds apart for good reasons. The main factors that move the number:

• Radiator type and quality: a budget single panel versus a coloured vertical designer rad or a cast-style column changes both supply cost and fitting time.
• Like-for-like vs different size: matching valve centres means a quick job; a size change means new pipework and re-running tails.
• Moving pipework: the single biggest cost driver — lifting floors, chasing walls and finding a tee on the circuit turn a 90-minute job into a half-day.
• Number of rads done at once: swapping several in one visit spreads the drain-down and refill time, so price a multi-rad job lower per unit than a single swap.
• Floor type: suspended timber with loft access is easy; screeded solid floors or finished tiled rooms are slow and disruptive.
• Valve condition: seized old valves often need cutting out and re-making, adding time you must allow for.
• System condition: a sludged system, awkward filling loop or a flush requirement all add scope.
• Access and protection: tight spaces, behind furniture, upstairs over carpets — all add setup, protection and clean-up time.

Quoting Tips — What to Check Before You Price

Radiator quotes go wrong when the engineer prices off the customer's description instead of seeing the job. Before you commit a price, confirm:

• Like-for-like or not: measure the existing rad and valve centres and confirm whether the new one matches.
• Valve state: check whether the existing valves isolate or are seized — this decides between a quick swap and a drain-down.
• System type: sealed or open-vented, and where the filling loop or F&E tank is.
• Signs of sludge: cold rad bottoms, no magnetic filter, dirty water — flag a flush if warranted.
• Floor and access: if pipework is moving, what's under the floor and how disruptive will making good be.
• Who supplies the rad: labour-only versus supply-and-fit changes the quote and your responsibility for the part.

Spelling out the scope in the quote — like-for-like swap, valves included or not, flush optional — protects you from the "but I thought that was included" conversation and sets you apart from the engineer who just texts a number.

Quick Reference: Radiator Replacement Prices UK 2026