The “legit engineer” checklist (what we’d tell our own family)
I’ll keep this real. In London, you’ll see ads that look brilliant… and then a guy turns up with no analyser, no paperwork, no Gas Safe ID, and a lot of confidence. Confidence is cheap. Proof matters.
1) Ask for Gas Safe registration — before they arrive
A proper gas boiler repair engineer should give you their Gas Safe registration number without getting defensive. Then you verify it yourself (takes 30 seconds).
2) When they arrive, check the Gas Safe ID card properly
Don’t feel awkward — it’s normal. The card should be in date and it should list the engineer’s photo and the work categories.
3) Listen for a proper diagnostic approach (not instant part-selling)
Good boiler repairs start with questions and tests: fault history, pressure behaviour, error codes, flue readings where needed. If the first sentence is “you need a new boiler mate” before they’ve even opened the case… red flag.
4) Ask what tools they’ll use (you’re allowed)
For gas boiler repair, certain checks require proper kit. If someone’s diagnosing blind, you’ll pay twice.
5) Get clarity on the call-out: what’s included and what isn’t
London pricing varies. What you want is transparency: what the diagnostic fee covers, whether it includes the first hour, and how parts/labour are handled.
6) Watch for the “too fast” diagnosis
If someone walks in, presses reset twice, and says “sorted” without explaining why it happened — that’s not a repair. That’s a delay.
7) Understand the common London traps (especially flats)
Balcony cupboard boilers, long condensate runs, and tight cupboards with poor ventilation — we see the same patterns weekly. A decent local boiler repair engineer will recognise these setups quickly.
8) Don’t ignore “small” symptoms: pressure loss, leaks, weird noises
These aren’t just annoying — they’re clues. The right engineer will follow them instead of masking them.
9) Trust your gut on behaviour
Rushing you, refusing to answer questions, pushing cash-only, or refusing to write anything down — those are not “London normal”. That’s someone you don’t want touching gas.
A quick reality check: “local” matters. Not because of postcode ego — because if something needs a follow-up part, you want someone who will come back and finish the job without vanishing.
