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What is involved in changing a radiator?
Changing a radiator means partly draining the heating system, swapping the radiator and often its valves, then refilling, venting and checking the system. The price depends mostly on whether the new radiator fits the old pipes, and this page does not print a figure.
Last reviewed:How a radiator gets changed
People search "how to change a radiator" for different reasons. Some have a leaking or rusted radiator. Some want a bigger one in a cold room, or a slimmer one to free up wall space. Some are redecorating and want a column radiator instead of a plain panel. For a home in Cheshire, the job a heating engineer does is broadly the same each time:
- The engineer turns the heating off and lets the system cool.
- They drain the system, or the part of it that serves that radiator.
- They lift the old radiator off its brackets and take it away.
- They fit new brackets if the new radiator needs them.
- They connect the new radiator, and new valves if those are being changed.
- They refill the system, release trapped air and, on a sealed system, bring the pressure back up.
- They add inhibitor if needed, then run the heating and check every joint for leaks.
That list describes what you are paying for. It is not a set of instructions for you to follow. This guide gives no DIY steps, because the job means opening a pressurised heating system that is usually connected to a gas boiler.
QuoteZila is starting in Cheshire, with Crewe, Nantwich and Sandbach among the first towns, and anyone in the UK can post a job. We have not printed a price here, because we could not find two dated public sources that agree on one.
Like-for-like or a bigger change?
The pipes decide most of the price. Every radiator connects to two pipes, one at each end, and the distance between them is called the pipe centres.
- Same size, same pipe centres. The new radiator lines up with the old pipes. This is the simplest version.
- Different width. If the new radiator is wider or narrower, the pipes may need extending or shortening, which can mean lifting floorboards or cutting into a wall.
- Different style. A vertical or column radiator usually needs different pipe positions altogether.
- A new position. Moving a radiator to another wall means new pipe runs.
- An extra radiator. Adding one means new pipes from the existing circuit, and the system may need balancing afterwards.
When you ask for quotes, give the size of the old radiator, the size and style of the new one if you have chosen it, and say whether the pipes come up through the floor or out of the wall.
What changes a radiator quote
| What changes | Why it matters | What to ask |
|---|---|---|
| Who supplies the radiator | Labour-only and supply-and-fit quotes cannot be compared directly | Is the radiator in the price, and which model? |
| Pipe alterations | Changing pipe centres or positions adds time and materials | Will the pipes need moving, and is that included? |
| Valves | New valves are often fitted at the same time | Are new valves included, and which type? |
| Brackets and wall | Heavy radiators may need new brackets and fixings | What brackets and fixings are included? |
| System type | Sealed systems need refilling to pressure; open-vented systems differ | Is the system sealed or open-vented, and does it matter? |
| Sludge and cleaning | Dirty water can damage a new radiator | Will the water be treated, flushed or cleaned? |
| Floors and making good | Lifting boards or chasing walls leaves work behind | Who puts the floor and wall back? |
| Number of radiators | Draining once for several radiators saves repeated work | Is there a price for doing more than one on the same visit? |
If one quote is much lower, check whether it assumes the pipes already line up, or leaves out valves and inhibitor.
Valves, controls and balancing
Changing a radiator is a good time to look at its valves, because the system is already drained. The Energy Saving Trust says a boiler-based central heating system should have at least a programmer, a room thermostat and thermostatic radiator valves [S2]. If the old radiator has a plain valve, ask whether a thermostatic one is being fitted.
After any radiator change, the system may need balancing so that hot water reaches every radiator evenly. Ask whether balancing is part of the job, especially if a radiator is added or a much larger one goes in.
Regulations and who can do the work
GOV.UK lists installing or replacing a heating system and adding radiators among jobs that may need building regulations approval, and says you do not need to arrange approval yourself if the installer is registered with a competent person scheme [S1]. A straight swap of one radiator is less likely to be affected, but adding radiators or altering the system can be. Ask the engineer.
If the boiler needs adjusting, or the work goes near gas pipework, that is gas work. HSE says anyone employed to work on gas appliances in a home must be a Gas Safe registered engineer and competent in that area [S3]. Check the engineer on the Gas Safe Register.
Gas Safe Register. QuoteZila is not affiliated with this organisation.
Do not drain the system, remove a radiator or adjust the boiler pressure yourself to save money. A small mistake can flood a floor or damage the boiler, and it may affect a boiler warranty.
Combining radiator work with other jobs
Radiator changes often happen alongside something else, such as redecorating, a new kitchen, replastering or new flooring. Because the system has to be drained, it can be worth doing several radiators on one visit, or doing them while the boiler is being serviced or replaced.
If you are decorating, think about the order. The radiator is usually taken off before walls are papered or painted, then refitted. Some decorators can work around a fixed radiator, but a full repaint behind it means it comes off. Ask whether the heating engineer can take it off, leave the pipes safe, and come back to refit it, and how that changes the quote.
If the floor is being replaced, pipes that run under it can be moved at the same time. That is often simpler than lifting a new floor later.
Choosing the replacement radiator
The radiator you choose affects both the fitting and how warm the room feels afterwards. Radiators are sold with a heat output figure, often given in watts or BTU. A slim designer radiator can look larger than a plain panel but give out less heat. If the room is already cold, a like-for-like swap will not fix it.
Before you buy, ask the engineer:
- what output the room needs, given its size, windows and outside walls
- whether the radiator you like will fit the existing pipe centres
- whether a heavier radiator needs a stronger fixing into the wall
- whether a towel rail in a bathroom will heat the room as well as the towels
If you buy the radiator yourself, check the size, the pipe positions and the output with the engineer before you order. A radiator that arrives the wrong size can mean extra pipe work on the day, or a second visit.
Jobs you might post
These are examples, not taken from real job posts.
- "One radiator in the kitchen is leaking at the bottom seam. Would like a new one the same size and new valves."
- "Want to swap three old panel radiators for column radiators in the living room and hall."
- "Adding a radiator to a converted garage. Pipes from the kitchen are close by."
Say how many radiators, their sizes, whether you have bought them, whether the pipes come from the floor or the wall, and what kind of boiler you have.
How to compare radiator quotes
Citizens Advice says a quote is a fixed price and an estimate is a guess, suggests written quotes from at least three traders, and suggests keeping any deposit to no more than 25% [S4]. For radiator work, ask each engineer to state:
- Whether the radiator and valves are supplied, and which models.
- Whether pipe alterations are included.
- Whether the system will be cleaned or treated with inhibitor.
- Whether floors and walls will be made good.
- Whether VAT is included. A business must register for VAT when its taxable turnover goes over £90,000 [S5].
If the job is quoted as a call-out plus hourly rate instead, the Advertising Standards Authority says a no call-out charge claim is only fair if there is no charge for travel, diagnosis or anything else before the work is agreed [S6].
Get quotes to change a radiator
QuoteZila is free for customers and local businesses [QZ1]. Up to five matched local businesses can send you a quote [QZ2].
Honest status: QuoteZila is new. We're starting in Cheshire, beginning with Crewe, Nantwich and Sandbach, and growing area by area. Anyone in the UK can still post a job or register a business. How fast you get quotes depends on how many local businesses have joined near you. Businesses can register and receive jobs straight away. We don't check insurance, qualifications or registrations, so please check these yourself before you hire.
Posting a job is not open yet
See heating engineers and plumbers for who does radiator work, and the plumber cost guide for how trade prices are usually set out. If a radiator is simply staying cold, see why a radiator is not heating up.
Questions about changing a radiator
How much does it cost to change a radiator?
This page does not print a figure. A like-for-like swap on the same pipe centres is a smaller job than moving pipes, changing the radiator size or adding a new one. Ask for written quotes that say whether the radiator and valves are supplied, and whether the system is cleaned or treated.
Can I change a radiator myself?
This guide does not give DIY steps. Changing a radiator means draining and refilling a heating system that is usually connected to a gas boiler, and mistakes can cause leaks or damage the boiler. Ask a heating engineer or plumber to do it.
Does a new radiator need building regulations approval?
GOV.UK lists adding radiators to a heating system among work that may need approval, and says you do not need to arrange it yourself if the installer is registered with a competent person scheme. A straight swap is less likely to need it, but ask.
Should I change the radiator valves at the same time?
Often it makes sense, because the system is already drained. The Energy Saving Trust says a boiler-based system should have thermostatic radiator valves, alongside a programmer and a room thermostat. Ask for the valves as a separate line.
Who should I call to change a radiator?
A heating engineer or a plumber who does heating work. If the boiler needs to be touched, that is gas work, and HSE says it must be done by a Gas Safe registered engineer competent in that area.
Does QuoteZila check the businesses?
No. We don't check insurance, qualifications or registrations, so please check these yourself before you hire. You can report a quote or a business from your job page.
This page is general information, not professional or legal advice. QuoteZila does not check Gas Safe, WaterSafe, NFRC, NICEIC or other registrations against the register on your behalf: look them up yourself.
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Sources
- QZ1: QuoteZila product fact. QuoteZila home and jobs-for-tradesmen copy.
- QZ2: QuoteZila product fact. QuoteZila FAQ and app README.
- S1: Building regulations approval, GOV.UK. Accessed 2026-10-25. https://www.gov.uk/building-regulations-approval
- S2: Heating controls, Energy Saving Trust. Accessed 2026-10-25. https://energysavingtrust.org.uk/advice/thermostats-and-heating-controls/
- S3: Domestic gas: frequently asked questions, HSE. Accessed 2026-10-25. https://www.hse.gov.uk/gas/domestic/faqs.htm
- S4: Before you get work done on your home, Citizens Advice. Accessed 2026-10-25. https://www.citizensadvice.org.uk/consumer/getting-home-improvements-done/before-you-get-building-work-done/
- S5: Register for VAT, GOV.UK. Accessed 2026-10-25. https://www.gov.uk/register-for-vat
- S6: Call-out charges, Advertising Standards Authority. Accessed 2026-10-25. https://www.asa.org.uk/advice-online/call-out-charges.html