The annual gas safety check
Every gas appliance and flue you provide must be checked at least every 12 months. A check carried out up to two months before the deadline can keep the original anniversary date, so the cycle does not creep earlier each year.
The rules cover mains gas and LPG, and they apply to holiday lets and rooms let in a house as well as standard tenancies.
Maintenance between checks
The annual check is a minimum, not the whole duty. Pipework, appliances and flues must be maintained in a safe condition all year. Following the manufacturer's servicing instructions is the usual way to show that.
You are not responsible for an appliance the tenant owns, but you remain responsible for the pipework and for any flue that is part of your property.
Choosing an engineer
Only a Gas Safe registered engineer may carry out the check or work on a gas appliance. Ask to see their Gas Safe ID card, and check on the back that they are qualified for the type of appliance involved, or look them up on the Gas Safe Register.