What is a gas safety certificate?
A gas safety certificate (officially called a Landlord Gas Safety Record, commonly known as a CP12) is a legal document confirming that all gas appliances, fittings, and flues in a rental property have been checked by a Gas Safe registered engineer and found to be safe. Under the Gas Safety (Installation and Use) Regulations 1998, every landlord in England, Scotland, and Wales is legally required to have gas appliances checked annually.
Who is responsible: the landlord or the letting agent?
The legal responsibility sits with the landlord. However, if you manage a property on behalf of a landlord, the duty of care often extends to you as the managing agent. Most management agreements make the agent responsible for arranging annual gas safety checks, and failure to do so could expose your agency to liability.
In practice, as a letting agent, you should treat gas safety certificates as your responsibility. If a tenant is harmed by a faulty gas appliance and the certificate has lapsed, both the landlord and the managing agent could face prosecution.
Penalties for non-compliance
Failing to maintain a valid gas safety certificate is a criminal offence. Penalties include unlimited fines, up to 6 months in prison, and invalidation of your landlord insurance. In the event of a carbon monoxide incident, charges of manslaughter are possible.
What does a gas safety check cover?
A Gas Safe registered engineer will inspect and test every gas appliance in the property. This typically includes:
The engineer will record the results on a Landlord Gas Safety Record (CP12), including each appliance tested, its location, and whether it passed or failed. If any appliance fails, it must be repaired or replaced before the property can be let.
How often do you need a gas safety check?
Every 12 months, without exception. The check must be completed before the anniversary of the previous certificate. You can have the check done up to 2 months early without losing your anniversary date, which gives you a useful buffer for scheduling. For new tenancies, the check must be done before the tenant moves in.
The 2-month rule
If your certificate expires on 1 September, you can have the new check done any time from 1 July onwards. The new certificate will still be dated from 1 September, keeping your annual cycle consistent. This is invaluable for agencies managing multiple properties with staggered expiry dates.
What must you give to tenants?
A copy of the gas safety certificate must be given to each existing tenant within 28 days of the check, or to any new tenant before they move in. You must keep records of all gas safety certificates for at least 2 years. Failing to provide the certificate to tenants is itself a criminal offence, separate from failing to arrange the check.
How to find a Gas Safe registered engineer
Only Gas Safe registered engineers can legally carry out landlord gas safety checks. You can verify an engineer's registration at the Gas Safe Register website (gassaferegister.co.uk). Every registered engineer carries an ID card with a unique licence number, a photo, and the types of gas work they're qualified to do. Always ask to see the card and check the back for their qualifications.
Managing gas safety across a portfolio
The challenge for letting agents isn't understanding the rules — it's tracking 10, 50, or 100+ properties with different expiry dates, different engineers, and different landlord preferences. This is where many agencies run into trouble: a certificate expires, nobody notices, and suddenly the agency is exposed to criminal liability.
Common approaches include spreadsheets, calendar reminders, or paper-based systems. These work for a handful of properties but become error-prone as your portfolio grows. A single missed renewal can result in prosecution, insurance invalidation, and reputational damage.
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