You do not need a boiler certificate to sell a house in England. No law requires a private seller to hold a gas safety record, because the annual gas safety check is a landlord duty under the Gas Safety (Installation and Use) Regulations 1998 as amended. What a buyer's solicitor does ask about is the building regulations compliance certificate for the boiler, alongside service records and a valid Energy Performance Certificate. This guide sets out which documents exist, who issues them, and what you can do when one is missing.
Do you need a gas safety certificate to sell a house in England?
No, a private seller in England does not need a gas safety certificate for the boiler. The annual gas safety check, and the record that follows it, are landlord duties under the Gas Safety (Installation and Use) Regulations 1998 as amended. They attach to let property, not to a home you are selling as the owner-occupier.
If you let the house before putting it on the market, the landlord records still apply to that period. A gas safety record must be kept for at least two years. HSE sets out what each record has to show: every appliance and flue checked, the engineer's name and registration number, the check date, the property address, and any safety defect found with the action taken.
HSE advises home owners to have gas appliances, flues and pipework checked and serviced by a Gas Safe registered engineer every 12 months, even though no law requires it. A recent service record is the paperwork you can hand over in place of a certificate you were never obliged to hold.
There is no certificate that proves a boiler is fit to sell. The boiler document that counts in a sale is the building regulations compliance certificate for the installation. An Energy Performance Certificate is separate, and a valid one is required when you market a home in England.
Which boiler paperwork does a buyer's solicitor ask for when you sell?
Replacing a boiler is notifiable work under the Building Regulations in England, so the document a solicitor looks for is the compliance certificate for that installation. Either a building control body checked the work, or the installer self-certified it through a competent person scheme. The scheme notifies the council and issues the certificate to the owner. GOV.UK names a house sale as the reason to keep it, because the document shows up in the searches your buyer's solicitor runs.
The GOV.UK guide to selling a home lists the papers to gather early, before your conveyancer sends out the TA6 property information form. For the heating system, that means:
- Building regulations compliance certificate for the boiler, from the competent person scheme or the building control body
- Benchmark commissioning checklist and logbook, completed at installation and at each annual service
- Service records, and any gas safety check carried out by a Gas Safe registered engineer
- Manufacturer warranty registration for the boiler and for any hot water cylinder
- A valid Energy Performance Certificate, which lasts 10 years and is given to the buyer free of charge
An EPC must be commissioned before the home is marketed in England if no valid one exists, and only an accredited assessor may produce it. An EPC you received when you bought the house can be reused within its 10 years, provided nothing since then has changed the rating.
CP12 or building regulations compliance certificate: which matters when selling a house?
A CP12 and a building regulations compliance certificate are different documents, and only one of them normally belongs in a sale file. The comparison shows what each one does when you sell a house in England.
| Point of comparison | Gas safety record (CP12) | Building regulations compliance certificate |
|---|---|---|
| Who it is for | Landlords letting a property, as a duty under the Gas Safety (Installation and Use) Regulations 1998 as amended | Owners of the home, as the record that boiler work was notified under the Building Regulations in England |
| Who issues it | A Gas Safe registered engineer after checking the appliances and flues | The competent person scheme the installer belongs to, or the local authority building control body |
| When it is produced | After each annual gas safety check on a let property | Once, after the boiler is installed or replaced |
| What the buyer learns from it | Which appliances and flues were checked on that date, and any defect recorded | That the council was notified of the installation and the work was certified as compliant |
| How long it is kept | Landlords keep the record for at least two years and give tenants a copy | Kept with the property papers and produced during the solicitor's searches at sale |
A buyer who intends to let the house will need gas safety records of their own once a tenant moves in. That duty starts with them, not with you as the seller.
Lost the boiler's building regulations certificate before a sale: what can you do?
Contact the competent person scheme that the installer was registered with. GOV.UK directs owners who never received a certificate to the scheme operator, which holds the notification record for the work. Gas Safe Register appears on the government list of competent person schemes, covering combustion appliances as well as heating and hot water systems. Asking the scheme for a duplicate is the usual first step, and how to ask for a copy of a boiler installation certificate sets out what to quote.
Where the work was never notified at all, the council holds no record that it complies. Local authority building control in England offers a regularisation application for unnotified work. That route is not open where an application was made at the time but no completion certificate followed. The regularisation route for a boiler explains what the application involves, and your conveyancer will advise how to answer the enquiry.
Does the boiler warranty pass to the buyer when you sell the house?
A registered manufacturer warranty stays with the boiler when the house changes hands. Viessmann's guidance on moving home states that the new owner must keep up the annual service for the warranty to remain valid. A gap in servicing can leave the buyer carrying the cost of a later repair. Warranty length and conditions vary by manufacturer and model, and registration within a set period after installation is a common condition.
Benchmark is the industry code of practice for installing, commissioning and servicing boilers. The installer completes the commissioning checklist, and each annual service is entered in the logbook. Baxi states that the logbook must be available to view, and that it can be requested during warranty work or by a building control inspector. Manufacturers also offer a digital Benchmark record, which helps when the paper booklet has gone missing.
If you plan to take the boiler with you, read the guarantee terms first. Vaillant's domestic boiler guarantee conditions state that moving the appliance to another property without the manufacturer's written consent can invalidate it.
Selling with a Megaflo: the unvented cylinder needs its own certificate
A Megaflo or other unvented hot water cylinder carries a building regulations record of its own, separate from the boiler. Installing an unvented hot water storage system is notifiable under Part G3 of the Building Regulations in England. Advance notice to building control is not needed where the installer is registered in a competent person scheme for unvented hot water systems, because the scheme notifies the work and issues the certificate.
Manufacturer manuals add their own paperwork. The Megaflo Eco Plus installation manual requires the commissioning section to be completed and left with the owner. Two separate installations mean two certificates in the sale file, so check both before your conveyancer asks. An unvented cylinder with no building regs record follows the same route as a boiler: the scheme operator first, building control after that.
What can you check on the boiler yourself before viewings?
Four things on the boiler are safe for you to look at before viewings: the pressure gauge, the thermostat and programmer settings, the reset button on the control panel, and bleeding the radiators. Those are the only tasks a householder should take on, and the user guide for your model describes each one.
Everything else belongs to a Gas Safe registered engineer: the gas pipework, the burner, the flue, seals, the condensate inside the appliance, and anything behind the casing. Under regulation 3 of the Gas Safety (Installation and Use) Regulations 1998 as amended, nobody may work on a gas fitting unless they are competent to do so. HSE states that anyone working on gas appliances in the course of business must be on the Gas Safe Register, and you can ask to see the ID card before work starts.
HSE also lists warning signs worth reporting to an engineer: lazy yellow or orange flames instead of crisp blue, soot or staining around the appliance, and a pilot light that keeps going out. Never cover ventilation grilles or the outside flue terminal. A carbon monoxide alarm is sensible, but it is no substitute for servicing. If the boiler has not been looked at for a while, you can arrange a boiler service and ask for the Benchmark logbook to be filled in at the visit.
Sources
- HSE – Gas safety check records and what to keep
- HSE – Gas safety: home owners
- HSE – Gas safety check: who can do it?
- legislation.gov.uk – Gas Safety (Installation and Use) Regulations 1998, regulation 3
- GOV.UK – Building regulations approval: use a competent person scheme
- GOV.UK – Competent person scheme: current schemes
- GOV.UK – How to sell a home
- GOV.UK – A guide to Energy Performance Certificates for the marketing, sale and let of dwellings
- GOV.UK – Approved Document G (with 2024 amendments)
- Baxi – Benchmark for installers
- Viessmann – Moving home and your boiler
- Vaillant – Domestic boiler guarantee terms and conditions
- Heatrae Sadia – Megaflo Eco Plus installation manual