Gas tightness testing (Gasdichtheitsprüfung) is mandatory after any work on gas installations in the UK, yet many installers and property owners remain unclear on exact requirements and who bears liability for non-compliance. Field service software provider Commusoft has published guidance highlighting the disconnect between regulatory standards and practice in heating trades. Failure to document tests properly or skip them entirely exposes installers to legal action and homeowners to safety risks. Contractors should verify they understand current Building Regulations and Gas Safety (Installation and Use) Regulations 1998 before each job.