Before they ask:
Do I need a gas safety certificate to sell my house?
No. A gas safety certificate is a landlord's legal duty, not a seller's, and this is one of the most common misunderstandings in a house sale. What does get asked for is building regulations compliance for a boiler installed since April 2005.
- How long
- Days to two weeks
- Typical cost
- Around £25 for a duplicate notification
- Who asks
- Buyer's solicitor
Almost every free seller checklist tells you to get a gas safety certificate. Almost every one of them is wrong about why.
The misunderstanding
A gas safety certificate — a CP12 — is a landlord’s duty. If you rent a property out, you must have gas appliances checked annually by a Gas Safe registered engineer and provide the record to tenants.
Selling a house is not renting one out. There is no equivalent legal obligation on a seller to hold or produce one.
This matters because a checklist that tells you to book a gas safety check is sending you to do a thing you do not need to do, while not mentioning the thing you actually get asked for.
What actually gets asked
Building regulations compliance for the boiler. Since April 2005, installing a boiler in England and Wales has been notifiable. A Gas Safe registered installer self-certifies the work and notifies it, which produces a Building Regulations Compliance Certificate.
If your boiler was installed from 2005 onwards, that certificate is the document a buyer’s solicitor is likely to ask for.
The Benchmark logbook. The commissioning record filled in by the installer. Often tucked into the back of the boiler manual, still in the kitchen cupboard.
Service records. Not a legal requirement, but routinely requested and easy to supply if you have them.
Where this bites. The enquiry is usually phrased loosely — “do you have the paperwork for the boiler?” — and a seller who has dutifully booked a gas safety check has spent money and produced a document that does not answer the question asked.
What to do
- Look in the kitchen. The Benchmark logbook and the boiler manual are in the house far more often than people expect.
- Work out roughly when the boiler went in. Before April 2005 and the notification question falls away.
- If it is post-2005 and you have nothing, Gas Safe Register can usually issue a duplicate certificate for a small fee.
- Gather service records if you have them.
While you are at it
If the boiler was replaced, there is a reasonable chance other work happened at the same time — a new gas supply run, or electrical work for the controls. Worth a moment’s thought about whether anything else in that job needs its own paperwork.
Common questions
So I need nothing at all?
Not quite. There is no legal requirement on a seller to produce a gas safety certificate, but a boiler installed from April 2005 should have been notified under the building regulations, and evidence of that notification is routinely requested. Service records are also commonly asked for, as good practice rather than legal obligation.
What is a Benchmark logbook?
The commissioning record completed by the installer when a new boiler is fitted. It is often found at the back of the boiler manual and is frequently the easiest evidence to produce, because it is physically in the house rather than in an archive somewhere.
How do I get a duplicate Gas Safe notification?
Gas Safe Register can issue a duplicate Building Regulations Compliance Certificate for a notified installation, usually for a small fee. You will need the property address and roughly when the work was done.
Should I get the boiler serviced before selling?
It is not required, and whether it is worth it is a commercial judgement rather than a legal one. A recent service record is a useful thing to have in the file when a surveyor comments on the age of the system, which they routinely do.
Last reviewed 13 September 2026. England and Wales.
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