First, check their credentials. All WaterSafe approved plumbers have an ID badge with the WaterSafe logo, so you can ask to see their ID card.
You can also contact the plumber’s Approved Contractor Scheme to validate their membership and ask what their minimum membership requirements are. Ask if they can give you a breakdown of the range of works carried out by their members in your area.
Referrals and recommendations are another useful way to check a plumber’s competency and reliability but can’t always be guaranteed – that’s why we recommend using a WaterSafe approved plumbing business, as we’ve already done the competency checks for you.