Fixington

Gas safety check (CP12)

Trade: Heating Engineer

⭐ Introduction

A Gas Safety Check, often referred to as a CP12, is an essential inspection carried out by a qualified Heating Engineer to ensure that your gas appliances and associated pipework are safe to use in your home. In the UK, safety is rightly a top priority with gas appliances, because of the risks of carbon monoxide leaks, gas leaks, or faulty flues which can lead to serious hazards.

These checks are especially important if you’re a landlord, as it is a legal requirement under the Gas Safety (Installation and Use) Regulations 1998 to have an annual gas safety check and obtain a CP12 certificate. However, even for homeowners, booking a gas safety check is a smart way to stay safe and avoid unexpected issues — particularly if you’ve just moved in, are preparing to sell, or after the installation of any new gas appliance.

🔧 What the job involves

A Heating Engineer will conduct a thorough inspection of all gas appliances connected to the supply in your home. This typically includes:

  • Gas boilers (combi, system or regular)
  • Gas fires and heaters
  • Gas cookers and hobs
  • Gas water heaters

During the check, the engineer will:

  • Examine all gas pipes and fittings for signs of leaks or corrosion.
  • Test the operation of each appliance to make sure it is burning gas safely and efficiently.
  • Check ventilation and flue systems to confirm exhaust gases are being safely expelled.
  • Measure gas pressure and carbon monoxide levels using specialist equipment.
  • Look for any records of issues or maintenance history, if available.

The engineer’s job is to confirm that all appliances are compliant with safety standards and not posing risks of gas or carbon monoxide leaks. On completion, if everything is in order, they will provide a Gas Safety Record (the CP12 certificate). If problems are found, remedial work will be advised.

📝 Step-by-step from booking to completion

  1. Make an enquiry
    Contact a Gas Safe registered Heating Engineer or company. Ask about availability and explain the appliances you want checked. Confirm they are registered and insured to work on gas.

  2. Schedule the appointment
    Agree a convenient date and time. The engineer may ask for details of your appliances beforehand.

  3. Preparation
    On the day, ensure access to all appliances and relevant areas (boiler cupboard, kitchen, living room). Clear any clutter if needed. Have any previous gas safety certificates handy.

  4. Gas safety check
    The engineer arrives and carries out inspections and tests as above. This typically takes between 30–60 minutes, depending on the number of appliances.

  5. Review findings
    The engineer discusses results with you, explaining any issues or maintenance recommendations.

  6. Certification
    If everything passes, you receive a Gas Safety Record (CP12) – a legal document that you should keep safely. If faults need repair, the engineer may offer a quote for remedial work or recommend another professional.

  7. Follow-up
    Arrange repairs if necessary, or schedule your next annual safety check reminder.

💷 Main costs to expect

  • Labour
    Typically the largest part of the cost. Most Heating Engineers charge a fixed call-out or hourly rate (around £60–£90 per hour).

  • Materials/Parts
    Small consumables (sealants, gas seals) may be included. If repairs are required (e.g. new valves or flue parts), these will add to the cost.

  • Extras
    Emergency or same-day appointments often cost more. Out-of-hours work attracts premium charges.

  • Disposal
    Usually minor or included in the service, unless large parts need replacing.

  • Certification
    The cost of the CP12 certificate is generally included in the service charge.

Example costs for a typical gas safety check (1 boiler + 1 gas hob):

  • Labour and visit: £75–£90
  • Minor parts (if needed): £0–£20 (usually none)
  • Certificate: included

📊 What affects the price

  • Number and type of appliances
    More appliances take longer to inspect.

  • Accessibility
    Difficult access (e.g., loft, tight cupboards) can increase time and cost.

  • Appliance complexity or age
    Older or unusual appliances may require more detailed inspection.

  • Previous or remedial work needed
    Faults or maintenance requirements increase labour and material costs.

  • Location
    Prices can vary by region; rural areas or London may differ.

  • Urgency
    Faster bookings or emergency call-outs cost more.

  • Regulations/compliance
    If additional certifications or Building Regulations compliance checks are needed, costs rise.

⏱ How long does it take?

For a standard domestic property with a single gas boiler and a gas cooker or hob, a gas safety check generally takes:

  • 30 to 60 minutes for a straightforward inspection with no issues.

If you have multiple appliances or complex layouts (e.g., gas fires in several rooms, water heaters), expect:

  • 1 to 2 hours to carry out a comprehensive check.

If repairs or fault-finding arise during the visit, additional time will be required.

🏠 Can you DIY it?

Due to the dangers involved in working with gas, including risks of leaks and carbon monoxide poisoning, do not attempt a gas safety check yourself. UK law requires a Gas Safe registered engineer to legally inspect and certify domestic gas appliances.

Gas appliances must be installed, maintained, and inspected by certified engineers to comply with Gas Safe Register rules and the Building Regulations.

If you suspect a gas leak or appliance problems between checks, your first step is to turn off the gas supply and contact a registered engineer or the National Gas Emergency Service immediately.

💰 Typical UK price range

The typical cost for a single domestic gas safety check ranges from about £75 to £120 including VAT. Larger or older properties with multiple appliances may pay more.

Please remember these are estimates and prices vary by location, engineer, and job complexity. Always confirm pricing before booking.

✅ Handy tips before you start

  • Book with a Gas Safe registered engineer only. Check registration at Gas Safe Register.

  • Prepare your home by ensuring clear access to all gas appliances.

  • Keep your CP12 certificates safely; you may need these for renting, selling, or future bookings.

  • Arrange annual checks to maintain safety and comply with landlord requirements.

  • Consider servicing your boiler at the same time for optimum efficiency and warranty compliance.

  • Don't ignore any issues found during the check; safety should always come first.

  • Be present during the check if possible to ask questions and understand your appliances better.

Regular gas safety checks help protect your home and family. It’s a straightforward, necessary process that can save you from costly repairs or, worse, serious accidents.