How to Find a Good Plumber

Finding a good plumber sounds simple enough — until you’ve had a bad one. A botched repair job can cause water damage that costs thousands to put right. Gas work done by an unqualified tradesperson can be fatal. And the cheapest quote on the day often turns out to be the most expensive decision in the long run.

This guide walks you through every step: where to look, what qualifications matter, which questions to ask before anyone lifts a spanner, and the warning signs that should send you straight back to your list.

Why Choosing the Right Plumber Matters

The consequences of hiring the wrong plumber go well beyond an annoying leak that keeps coming back. Poorly fitted pipework can cause hidden water damage inside walls and floors — damage that only becomes visible weeks later, by which point mould has taken hold and structural timbers may be affected. On the gas side, the stakes are even higher. Illegal gas work is responsible for dozens of deaths in the UK every year from carbon monoxide poisoning and gas explosions. This is not an area to cut corners.

A competent, properly insured plumber also protects you legally. If work is done without the appropriate certifications and something goes wrong, your home insurance may refuse to pay out.

Where to Look for a Plumber

Personal Recommendations

Word of mouth remains the gold standard. Ask neighbours, friends, and family who they’ve used — and crucially, whether they’d use them again. A recommendation from someone who had a complex job done well is worth considerably more than five-star reviews from strangers.

Online Directories

Reputable directories vet the tradespeople they list and allow you to read genuine reviews. Using a trusted directory like PlumbingPark to find vetted engineers in your area is a reliable starting point, particularly if you’re new to an area or need a specialist trade quickly.

Trade Associations

Organisations such as the Chartered Institute of Plumbing and Heating Engineering (CIPHE) and the Association of Plumbing and Heating Contractors (APHC) maintain registers of qualified members. Membership isn’t compulsory, but it indicates a professional who takes their trade seriously.

Gas Safe Register

For any work involving gas — boiler installations, gas hob fitting, flue work — the engineer must by law be registered with the Gas Safe Register. You can search for registered engineers at gassaferegister.co.uk. This is not optional; it is a legal requirement.

Essential Qualifications to Look For

Qualifications tell you that someone has been formally assessed against a recognised standard. Here is what to look for:

Gas Safe Registration — Mandatory for all gas work in the UK. Ask to see the engineer’s Gas Safe card and check the reverse, which lists exactly which types of gas work they are qualified to carry out. Different jobs (boiler installation, unvented cylinder work, LPG) require different endorsements.

City & Guilds / NVQ Level 2 or 3 in Plumbing and Heating — The industry-standard vocational qualifications for plumbers. Level 3 indicates a more advanced skillset. Not every competent plumber has formal paperwork, but qualifications do provide a baseline of assurance.

OFTEC Registration — Required for oil boiler servicing and installation, in the same way Gas Safe covers gas appliances.

Unvented Hot Water Cylinder qualification (G3) — Needed for anyone working on high-pressure (unvented) hot water systems. This is a sealed pressurised system, and incorrect work can cause catastrophic failure.

Questions to Ask Before You Hire

Never skip the pre-hire conversation. A professional plumber will answer these questions without hesitation. Someone who becomes evasive or impatient is telling you something important.

1. Are you Gas Safe registered? (For any gas work — ask to see the card.)
2. Do you have public liability insurance? What is the level of cover? Get the policy details if the job is significant.
3. Can you provide references from recent similar jobs?
4. Will you give me a written, itemised quote? Not an estimate — a quote, in writing.
5. What is your callout charge? Is there a minimum charge? How is labour billed — hourly or by the job?
6. How long will the work take? Is there a risk of overrun?
7. Will the work require building regulations notification? (Relevant for certain heating installations and bathroom alterations.)
8. Who will actually be doing the work? Some firms quote and then send a subcontractor. Make sure the person turning up holds the relevant qualifications.

Red Flags to Walk Away From

These are not minor concerns. Each one warrants removing someone from your shortlist:

• No written quote. A verbal quote offers you no protection and no benchmark.
• Cash only, no receipt. This usually means no VAT registration, no paper trail, and no accountability.
• Unable or unwilling to show ID or Gas Safe card. A legitimate tradesperson carries this as standard.
• Pressure to start immediately or urgency about the price only being valid today. Legitimate plumbers are busy — they do not need to pressure you.
• Unusually low price. If a quote is dramatically cheaper than the others, ask yourself why. It may mean substandard materials, unlicensed work, or a plan to add costs once the job is underway.
• Dismissive of written contracts or paperwork. Professionalism shows in the admin as much as the tools.

Getting and Comparing Quotes

Always get at least two or three written quotes for any job over a few hundred pounds. This is not just about price — it is about understanding the scope of work. If one quote is significantly lower than the others, either the plumber has missed something or they are planning to cut corners.

When comparing quotes, make sure you are comparing like for like. Does each quote include:

• All labour, including anticipated overruns?
• Materials and parts (and which brand/grade of parts)?
• Waste disposal if old units are being removed?
• Any necessary certifications or building regulations sign-off?

A well-structured written quote should leave no ambiguity. If you have to ask follow-up questions to understand what is included, ask them before you accept.

How to Verify Credentials

Gas Safe Register: Go to gassaferegister.co.uk and enter the engineer’s Gas Safe ID number (shown on their card). This confirms they are currently registered and shows which categories of gas work they are licensed to carry out.

Reviews: Look at Google reviews and Trustpilot profiles. Read the negative reviews as carefully as the positive ones — how a business responds to complaints tells you a great deal. Be cautious of profiles with dozens of identical five-star reviews posted in a short window.

Companies House: For any significant job with a company, you can check their registration and filing history at companieshouse.gov.uk. A dissolved company or one with consistent late filings is worth a second look.

Why Insurance Matters

Public liability insurance protects you if the plumber damages your property during the job — whether that is a cracked floor tile, a flooded bathroom, or something more serious. Without it, you would have to pursue a civil claim against an individual who may have no assets worth claiming against.

For gas and heating work, you should also ask whether the engineer carries professional indemnity insurance. If a boiler installation is signed off incorrectly and causes a problem months later, this is the cover that matters.

Always ask for proof of insurance in writing before work begins on larger jobs. Reputable tradespeople expect this and will provide it readily.

A Quick Checklist Before Hiring

Use this before you commit to any plumber:

• Found via recommendation, reputable directory, or trade association
• Gas Safe registered (if gas work involved) — verified online
• Relevant additional qualifications confirmed (OFTEC, G3, etc.)
• Public liability insurance confirmed in writing
• Written, itemised quote provided
• At least two other quotes obtained for comparison
• References checked or recent reviews reviewed
• No red flags: cash only, no ID, pressure tactics, unusually cheap

Taking thirty minutes to work through this list before hiring can save you a great deal of time, money, and stress afterwards. Good plumbers exist in every area — the key is knowing how to find them.