Checks to make
| Check | UK | USA |
|---|---|---|
| Qualified for gas work | Gas Safe Register (ID card lists appliance types) | Licensed for gas work under state or local rules |
| Qualified for water work | WaterSafe approved plumber, or trade body membership | State or local plumbing license (apprentice, journeyman or master) |
| Insurance | Public liability insurance | General liability, plus workers' compensation if they have employees |
| Paperwork | Written quote, and certificates for notifiable work | Written estimate, and permits where needed |
Questions to ask
- Have you done this type of job before? Can I see examples or references?
- Is your quote fixed, or an estimate? What could change it?
- Who will do the work: you, an employee or a subcontractor?
- What guarantee or warranty comes with the work and the parts?
- Will you handle any certification, notification or permits?
Red flags
- Cold calls or door-knocking offering urgent work.
- Pressure to decide on the spot, or "today only" prices.
- Cash-only with no receipt, or a large payment before work starts.
- No landline, address or business details.
- Unwilling to show a registration card or licence number.
Last updated: 14 October 2026
