Landlord Gas Safety Check: What's Actually Included in a CP12

Landlords ask us some version of the same question all the time: what does a Gas Safety Check actually cover, and why does it need doing every single year? Here's a straightforward answer, without the jargon.

What the engineer actually checks

Every gas appliance in the property gets inspected — boilers, gas fires, gas cookers, and any associated pipework. That includes checking the appliance is operating at the correct pressure, testing for gas tightness across the pipework, confirming ventilation is adequate, and checking that any flue is correctly installed and safely clearing combustion gases. If there's a flue issue — a poor seal, incorrect routing, or insufficient clearance — that's exactly the kind of fault a proper check is designed to catch before it becomes dangerous, not after.

Why it's an annual requirement, not a one-off

Appliances degrade, pipework can be disturbed by other trades working in a property between tenancies, and flues can be affected by building work nearby. A certificate from two years ago doesn't tell you anything about the system's condition today. The annual cycle exists because gas safety genuinely does change year to year, not because of red tape for its own sake.

One engineer, not three separate call-outs

A lot of landlords end up booking a gas engineer, an electrician, and someone for fire safety compliance separately — three appointments, three invoices, three sets of paperwork to keep track of across a portfolio. Pristine Gas Ltd covers gas safety, electrical fault finding and consumer unit compliance, and fire safety considerations like flue and ventilation checks under one visit. For a landlord juggling multiple properties, that's the difference between one afternoon and three.

Serving landlords across London and Hertfordshire

Whether it's a single rental flat or a small portfolio, the certificate and the paperwork trail matter as much as the check itself — see our Landlord Gas Safety Certificate service for full details. Call 07472 251465 to book a check or get your renewal dates sorted for the year ahead.