Fixington

Replace a radiator

Trade: Heating Engineer

⭐ Introduction

Replacing a radiator is a common home improvement task that helps maintain an efficient and comfortable heating system. You might need to replace a radiator if it’s leaking, damaged, corroded, or just no longer providing enough heat. Sometimes upgrading your radiators can also improve the overall look of a room or help balance your central heating to save energy. Whether you have an old single panel radiator or a modern double panel model, getting it replaced correctly ensures your home stays cosy during the colder months.

🔧 What the job involves

Replacing a radiator usually means removing the existing unit from your heating system and fitting a new one in its place. This involves draining your central heating system—either partially or fully—to avoid leaks during the swap. The heating engineer will disconnect the radiator valves, lift out the old radiator, and connect the new one securely. They’ll also check the pipework, valves, and sometimes fit new thermostatic radiator valves (TRVs) if requested.

After installation, the system is refilled and bled to remove air, ensuring the radiator heats properly. If your home has a pressurised or combi boiler system, proper pressure checks and flushing may be needed too. All work should meet UK safety and building standards; for example, if the radiator is connected to a gas boiler, your heating engineer must be Gas Safe registered.

📝 Step-by-step from booking to completion

  1. Initial enquiry: Contact a reputable heating engineer to describe your radiator and situation. They may ask for radiator size, type, your heating system type, and how many radiators you want replacing.
  2. Survey and quote: The engineer will arrange a visit to assess your current system, radiator condition, pipework, and accessibility. They will identify any potential issues and provide a written quote.
  3. Booking the job: Agree on a date and confirm any preparatory requirements (e.g., clearing the area around the radiator).
  4. Day of installation: The engineer arrives, drains the heating system or isolates the relevant part, removes the old radiator, installs the new one, reconnects valves, and refills and bleeds the system.
  5. Testing and wrap-up: The system is tested to ensure there are no leaks and your heating is working efficiently. The engineer will tidy up the workspace and discuss any recommendations or paperwork.
  6. Documentation: Keep any invoices and certificates (including any Part P or Gas Safe documentation if applicable) safely for future reference.

💷 Main costs to expect

  • Labour: Typically £60–£100 per hour for a Gas Safe-registered heating engineer.
  • Radiator unit: A standard panel radiator costs around £50–£150 depending on size and style.
  • Valves and fittings: Replacement valves or new thermostatic radiator valves (TRVs) add £20–£60.
  • Disposal: Removing and disposing of the old radiator may add £20–£40.
  • Certification (if applicable): Any gas-related work requires certification, sometimes included in labour costs.

For example, replacing one standard radiator might break down as:

  • Labour (2 hours): £140
  • Radiator: £100
  • New valves: £40
  • Disposal: £30
    Total: Approximately £310 + VAT

📊 What affects the price

  • Access: Difficult-to-reach radiators (tight spaces, upstairs rooms) increase time and effort.
  • System complexity: Radiators on older systems or with non-standard pipework may need extra preparation.
  • Regulations/certification: Gas boiler linked radiator work needs Gas Safe registered engineers and certification.
  • Remedial work: Pipe repairs, flushing the system, or upgrading valves add to costs.
  • Location: Prices vary by region and the engineer’s call-out area.
  • Timeline: Emergency or out-of-hours work often costs more.

⏱ How long does it take?

  • Simple swap: 1-2 hours for a straight replacement of a radiator with similar size and valve configuration.
  • With valve replacement: Add up to 30 minutes to fit new TRVs or thermostatic valves.
  • Complex installs: 3-4 hours or more if pipework modifications, system draining/refilling, or radiator repositioning is needed.

🏠 Can you DIY it?

It’s possible to replace a radiator yourself if you have basic plumbing skills and the system is straightforward. However, you must:

  • Drain the central heating safely without causing leaks.
  • Correctly reinstall valves and ensure tight seals.
  • Refill and bleed the system to remove air.
  • Check for leaks and proper heating function.

If your heating system involves gas boilers or requires working on sealed systems or pressurised pipes, it is safer and often legally required to hire a Gas Safe registered engineer. Incorrect work can lead to leaks, damage, or unsafe conditions.

💰 Typical UK price range

For a standard radiator replacement by a qualified heating engineer, expect to pay approximately £250–£450 inc. VAT per radiator. Larger, designer, or column radiators can cost more due to the price of the unit and installation complexity. Pricing includes labour, materials, disposal and basic certification (if required).

✅ Handy tips before you start

  • Clear the area around your radiator beforehand for easy access.
  • Take note of your radiator size (height, length, depth) and connection type before contacting engineers.
  • Ask the heating engineer about upgrading to thermostatic radiator valves for better heating control.
  • Keep all paperwork, receipts, and certificates for warranty and future servicing.
  • After installation, check your heating system’s pressure regularly and bleed radiators if they feel cold or noisy.
  • If your heating system is older, consider getting it flushed at the same time to remove sludge and improve efficiency.

Replacing a radiator with professional help can quickly restore comfort to your home heating — and help keep your system running smoothly for years to come.