How much does a gas safety certificate (CP12) cost? [2026 UK price guide]

TL;DR — Gas Safety Certificate (CP12) Cost At A Glance

• A CP12 gas safety certificate typically costs £60 – £90 inc VAT for a boiler plus one appliance.
• Each extra gas appliance adds £10 – £20 to the price.
• London and the South East run £85 – £120 for the same check.
• A CP12 (the Gas Safety Record) is a legal requirement for landlords every 12 months — it is not the same as a boiler service.
• The check must be carried out by a Gas Safe registered engineer, who inspects each gas appliance and flue.
• Booking the certificate alongside a boiler or central heating service is cheaper than paying for two separate visits.

Book a CP12 gas safety certificate with a Gas Safe registered engineer — check prices and book online or call to arrange a landlord check.

How Much Does A Gas Safety Certificate (CP12) Cost In 2026?

A CP12 gas safety certificate in the UK costs £60 – £90 inc VAT for a boiler plus one additional gas appliance, with each extra appliance adding £10 – £20. In London and the South East, expect £85 – £120 for the same check. The visit usually takes 30–60 minutes for a typical property with a boiler and a gas hob or fire.

The CP12 — officially the Landlord Gas Safety Record — is a legal document confirming that the gas appliances and flues in a property have been checked and are safe. It is a legal requirement for landlords to have one for each let property every 12 months, and to give tenants a copy. It is not the same as a boiler service: the CP12 confirms safety on the day, while a service is a more thorough clean and inspection to keep the appliance running well.

Price mainly reflects the number of gas appliances, your location, and whether the certificate is booked on its own or combined with a service. A one-bedroom flat with a single boiler is at the lower end; a larger property with a boiler, gas hob, gas fire and a cooker costs more because there is more to inspect.

Here is what a CP12 typically costs across the UK in 2026:

Figures include VAT and reflect 2026 market rates. Your exact price depends on the number of appliances and your postcode — get a fixed quote here.

CP12 Cost Combined With A Service

Many landlords book the certificate at the same time as a boiler or central heating service, which is cheaper than two separate visits. These are typical combined prices.

Combining the two means one call-out fee and one appointment, and the engineer already has the appliances open for inspection.

What Affects The Cost Of A CP12 Certificate?

A CP12 is a standardised check, but a few things move the price.

1. Number Of Gas Appliances

The base price usually covers the boiler and one appliance. Every extra gas appliance — a hob, oven, fire or water heater — adds £10 – £20, because each must be individually inspected and recorded.

2. Your Location

London and the South East run higher on labour and travel, so a certificate that costs £60 – £90 elsewhere is typically £85 – £120 in the capital.

3. Standalone Or Combined With A Service

A CP12 on its own is the cheapest way to meet the legal requirement. Combining it with a boiler or central heating service costs more overall but less than booking the two visits separately.

4. Property Type And Access

A single flat with one appliance is quick. A larger property, an HMO with multiple units, or appliances in awkward locations take longer and cost more.

5. Portfolio Size

Landlords with several properties can sometimes agree a per-property rate for a batch of checks, which can lower the cost per certificate.

What's Included — And What's Not

If an appliance is found unsafe, the engineer will advise on the repair, and any work is quoted before it goes ahead.

Can You Do It Yourself?

No. A CP12 is a legal safety certificate that only a Gas Safe registered engineer can issue. It involves testing gas pressure, appliance operation and flues with calibrated equipment, and the resulting record has legal standing for landlords. A homeowner cannot carry it out or self-certify, and any attempt to work on gas appliances without registration is illegal and dangerous.

Homeowners are not legally required to hold a CP12 at all — it is a landlord obligation — but arranging a voluntary gas safety check gives peace of mind, especially in an older property or before selling. Between checks, keep gas appliances clear, watch for warning signs such as a lazy yellow flame, soot marks or a boiler that keeps cutting out, and fit a carbon monoxide alarm — see the carbon monoxide alarm installation cost guide.

How To Save Money On A CP12 Certificate

• Combine the CP12 with a boiler or central heating service — one visit is cheaper than two.
• Book in spring or summer, away from the autumn rush, when engineers have more availability.
• Group multiple properties if you are a landlord with a portfolio, as batched checks can attract a lower per-property rate.
• Keep appliances accessible so the engineer is not held up, keeping the visit short.
• Stay on schedule — a lapsed certificate risks fines and invalidated insurance, which cost far more than the check.
• Get a fixed price up front that states how many appliances are included.

How To Hire A Good Gas Safe Engineer

Check the engineer is on the Gas Safe Register — ask to see the ID card and verify the number and the appliance categories on the official register. Confirm the fixed price, how many appliances it covers, and that you will receive the proper CP12 record (not an informal note). Genuine reviews and clear, upfront pricing without surprise add-ons are good signs.

With Fantastic Services, you get Gas Safe registered engineers, transparent pricing and easy online booking — arrange a landlord CP12, or a certificate combined with a service, in a few clicks.

Frequently Asked Questions

How Much Does A CP12 Gas Safety Certificate Cost In 2026?

A CP12 costs £60 – £90 inc VAT for a boiler plus one appliance, with each extra appliance adding £10 – £20. London and the South East run £85 – £120. Combining the certificate with a service costs more overall but less than two separate visits.

What Is A CP12 Certificate?

A CP12, or Landlord Gas Safety Record, is a legal document confirming that the gas appliances and flues in a property have been inspected and are safe. Landlords must renew it every 12 months and give tenants a copy.

Is A CP12 A Legal Requirement?

For landlords, yes. Every let property with gas appliances needs an annual gas safety check and a valid CP12 by law. Homeowners are not legally required to hold one, though a voluntary check is a sensible safety step.

How Often Does A CP12 Need Renewing?

Every 12 months. A landlord must arrange a new gas safety check and issue a fresh CP12 before the current one expires, and keep records for at least two years.

Is A CP12 The Same As A Boiler Service?

No. A CP12 confirms the gas appliances are safe on the day of the check. A boiler service is a more thorough clean and inspection to keep the appliance running efficiently. They are often booked together but are separate jobs.

Who Can Issue A CP12 Certificate?

Only a Gas Safe registered engineer qualified for the relevant appliances can carry out the check and issue a valid CP12. Always verify the engineer's registration on the official Gas Safe Register before the visit.

What Happens If A Landlord Has No CP12?

Letting a property without a valid gas safety certificate is a criminal offence and can lead to fines, prosecution and invalidated insurance. It also puts tenants at risk, so keeping the certificate current is far cheaper than the consequences of not having one.