Guides

Short explainers on the rules and costs that come round every year or every five. Every figure links to its source and shows the date we checked it.

Renewal, engineer fee, new registration, cards and late renewal, from the official Gas Safe Register magazine.

When to reassess, the 6-month early window, the 12-month cut-off and how the core and appliance assessments fit together.

Permissible drops now depend on installation volume, pipework-only retest, gauge rules and purge volume = 1.5 × IV.

The test stages, the gauge "no perceptible movement" rules and when you must calculate IV, with links to the official tables.