Choosing the wrong gas engineer puts your family at risk and can invalidate your boiler warranty. Here's how to verify you're hiring someone qualified and trustworthy.
Step 1: Verify Gas Safe registration
Check any engineer at gassaferegister.co.uk before booking. Enter their licence number and confirm they're qualified for domestic gas boilers.
Step 2: Check reviews
Google reviews, Trustpilot, and Checkatrade all provide genuine customer feedback. Look for patterns — a dozen negative reviews about poor communication or hidden charges are a red flag.
Step 3: Get multiple quotes
For major work like new boiler installations, get at least two or three quotes. This isn't just about price — it helps you assess the quality of the survey and the knowledge of each engineer.
Step 4: Ask for a full written quote
The quote should itemise: the boiler model and output, flue type and length, any additional work (power flush, filter, controls), VAT, and the warranty terms. Never accept a verbal quote for major works.
Step 5: Check their industry accreditations
Worcester Bosch Accredited Installer, Vaillant Advance Partner, and similar accreditations mean the engineer has passed manufacturer-specific training. This unlocks extended warranties and usually indicates higher technical skill.