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Why Landlords Should Get an Annual Gas Safety Check The possession of a CP12 certificate indicates that an engineer who is registered has inspected your property's gas appliances, pipework and flues and found them be safe. It is a legal requirement for landlords to schedule regular inspections. Only an engineer that has been approved by the Gas Safe Register can issue a CP12. The tests typically take between 30 and 60 minutes. Installation Gas Safety Certificates, also referred to as CP12 certificates are legal
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