What To Do If a Plumber Does a Bad Job

What to do first when a plumber has done a bad job

Make the installation safe, hold the money, and put the complaint in writing the same day. Isolate anything leaking at the stop tap or the local isolating valve, and turn off any gas appliance or electrical connection you are unsure about. Do not release an unpaid balance, and do not let anyone strip the work out while you still need to prove what was done.

The order matters more than the wording. A complaint made the same day, in writing, against a job you have photographed, is a strong position. The same complaint three weeks later by phone, after a second plumber has removed the work and skipped the old parts, is close to unarguable. Evidence vanishes fast in plumbing, because the point of the second visit is to remove what went wrong.

Be precise about what you mean by bad. Either the work leaks or fails, or it was the wrong work because the diagnosis was wrong, or it was never finished. Those three read the same in an angry email and carry different remedies.

• Isolate water at the stop tap or the local isolating valve
• Turn off and leave off any gas appliance or circuit you are unsure about
• Photograph the work in place, and the parts fitted, before anything is disturbed
• Send a short written complaint the same day, even if you have already phoned

Keep the parts. A failed valve, a fitting used on the wrong pipe material, or the old component that was removed is physical evidence, and in a dispute it is worth more than any amount of description.

Do you have to let them come back and put it right?

In almost every case yes, and it is in your interest. The Consumer Rights Act 2015 gives you repeat performance first, meaning the trader redoes the defective work at their own cost within a reasonable time. Only where that fails, is impossible, or causes you significant inconvenience do you move to a price reduction or to recovering the cost of correcting it elsewhere.

People resist this, understandably. Once someone has flooded your kitchen you do not want them back in it. But refusing the visit hands them their best defence, which is that they offered and you would not allow it. If you do not want that individual back, ask the firm in writing for a different engineer.

The limits are real. Two failed visits on the same fault is usually where a reasonable person stops, and you do not have to wait weeks while your hot water sits in pieces. Where the work is genuinely unsafe, deal with the danger immediately and argue about the bill afterwards, but write down why you could not wait.

What evidence to gather before anything is disturbed

Gather four things: photographs of the work as it stands, the paper trail of what was agreed and paid, an independent written opinion, and the parts themselves. All four get harder to obtain the longer you leave it.

Photograph wide, then close. The wide shot shows where the work sits and what it connects to. The close shots decide the argument: the joints, the supports, the pipe runs, the labels on the parts fitted, any staining. If a fitting is weeping, take a video with the drip in it.

The paper trail is the boring half and the half that wins. Keep the quote, the invoice, the payment record and every message. If the agreement was made by phone with nothing written down, email now setting out what you understood was agreed. Their reply, or their silence, becomes part of the record.

The independent opinion turns your complaint into a finding. A second engineer writing down what they found and why it falls short gives a card provider or a court something it can read. Ask for the defect and the remedy, not a comment on the first firm.

• Wide and close photographs of the installation, the parts and any damage
• The quote, the invoice, the payment record and every message exchanged
• A written report from a second engineer describing the defect and the remedy
• The parts that were fitted or removed, bagged and kept

How to write the complaint so it gets a response

Keep it short, factual and dated, and ask for one specific thing by one specific date. The emails that get ignored are the long ones full of feeling. The ones that get answered set out what was agreed, what was delivered, what is wrong, and what you want done. Six sentences and three photographs beats two pages.

End with what happens if the date passes, stated once and calmly. A plain sentence saying you will otherwise have the work corrected elsewhere and seek to recover the cost is accurate, it is what the law contemplates, and it moves a diary appointment in a way that anger does not. Send it by email, to the company rather than only to the mobile of whoever attended.

Most of how to complain about a plumber effectively is structure rather than tone: what was agreed, what was delivered, what you want done about it, and by when.

• Address, date of the work and invoice number at the top
• What was agreed, in one sentence
• What is actually wrong, in plain terms, with photographs attached
• What you want: a return visit at no further cost, by a stated date
• What you will do if that date passes, stated once

Was the person qualified to do the work they did?

Check the register, not the van. Anyone working on gas appliances in a home must be on the Gas Safe Register, and you can check an individual and the categories they hold using the business name or registration number. Unvented hot water cylinders need their own competence, and work on a sealed pressure vessel by someone without it is a real problem, not a technicality.

It matters for two reasons. It tells you whether this is poor workmanship or work that should never have been attempted, and it changes where you escalate. Gas work carried out by someone unregistered is reportable to the Gas Safe Register, because the consequences land on the householder.

Ask for the paperwork the job should have produced: the manufacturer documentation, commissioning details filled in rather than left blank, the serial number recorded, and any certificate the work required. When you raise it, describe what you found and what is missing rather than characterising the person. A complaint that names the defect gets answered. One that calls someone a cowboy gets a defensive reply and nothing else.

Start with how to check a plumber on the Gas Safe Register, because gas work carried out by somebody who is not on it is a different matter from poor workmanship and goes to a different place.

The same question applies to stored hot water. An unvented cylinder repair carried out by somebody without the unvented qualification is not simply bad work, it is work the person was never entitled to do, and that changes what you are complaining about.

If an engineer has classed an appliance as at risk or immediately dangerous and turned it off, leave it off. Turning a capped appliance back on to get through a weekend is unsafe, it is an offence, and it wrecks your position in any dispute.

What to do if they refuse to return or go quiet

You have three routes and they run in parallel: the card provider, a dispute scheme if the firm belongs to one, and the small claims track. Reviews are not a route. They feel like leverage, they carry a defamation risk, and they recover nothing.

If you paid any part of the bill by credit card and the total was over one hundred pounds, section 75 of the Consumer Credit Act makes the card provider jointly liable with the trader for breach of contract, and you claim against the provider directly. Debit cards fall outside section 75, but chargeback may apply and the window is short. This is the strongest reason to pay for substantial work by card.

The small claims track exists for exactly this. Send a letter before action with a deadline, then issue online if it is ignored. It is built to be used without a solicitor and most disputes of this kind are decided on documents: the quote, the invoice, the photographs and the second engineer report. This is where day one evidence earns its keep.

At this point most people ask can you withhold payment from a plumber, and the answer is narrower than it sounds and depends on what has already been invoiced and what has already been paid.

• Credit card and over one hundred pounds: claim against the card provider under section 75
• Debit card: ask about chargeback quickly, the window is limited
• Trade body or code scheme member: use their process, after checking membership is live
• Letter before action, then the small claims track, with the evidence attached
• Unregistered gas work: report it to the Gas Safe Register

When to stop chasing and get the work done properly

Stop when the risk of waiting outweighs the money in dispute, or after a second failed attempt on the same fault. Appoint another firm, keep the cost reasonable and itemised, and pursue the money separately. Waiting on a firm that has stopped replying is not patience, it is letting the damage grow.

You are expected to keep your losses reasonable, so you cannot let a leak run for a month and then present the whole bill. Have the defect corrected at a normal cost and ask the new engineer to record what they found before changing anything.

Some situations mean moving immediately and arguing later: water escaping into a flat below, a gas appliance turned off as dangerous, an unvented cylinder discharging, or no hot water in cold weather with a young child or an elderly resident at home. None of those is a place to stand on principle.

How to avoid hiring badly next time

Hire on checkable competence and a written scope, not on whoever appeared first. Most jobs that go wrong went wrong at the booking, because someone was chosen on price or on position in a list with nothing written down about what would be done.

Understand the incentive behind how you found the firm. Prominent placement in directories, map listings and search results is usually paid for, often per click or per lead. That is legitimate business and says nothing about whether a particular firm is good. It does mean a business buying customers carries an acquisition cost, and that cost is recovered somewhere: in the rate, in the parts margin, or in an enthusiasm for the larger job. Position measures marketing spend, not workmanship.

Ask for what is cheap to request and expensive to fake. A registration number you can check yourself. A written scope naming the parts and the work rather than the words repair hot water. A clear answer on how the call-out is charged and what it covers. None of that promises a good job, but it removes the firms that were never going to write anything down.

Be suspicious of a diagnosis that arrives before an inspection. The honest sequence is that someone looks at the system, tests it, explains what failed and why, then quotes. A replacement quoted over the phone from a described symptom is a sales process, not an engineering one, and in my experience it predicts the job you will be complaining about later.

Most of how to find a good plumber is unglamorous: check the registration yourself, ask who will actually attend rather than who answers the phone, and read the quote for what it excludes rather than for what it promises.

Ask for the G3 qualified plumber registration number before the booking is made rather than after the work is finished.

• Check the registration yourself rather than accepting a logo
• Get the scope in writing, naming the parts and the work
• Expect a diagnosis from an inspection, not a phone description
• Pay by card on anything substantial so section 75 stays open