Overcharged by a Drainage Company? How to Check and Dispute the Bill

If you think a drainage company has overcharged you, start by asking for an itemised invoice and comparing every line with what you agreed before the work started. Most disputes come down to one of three things: a price that was never agreed, extras added without your consent, or time billed in a way you were not told about. Each has a clear next step, and UK consumer law gives you more room than many people realise. This guide sets out how to tell whether a bill is genuinely too high, how to challenge it, and when the price was fair even if it hurt. For comparison, our own prices by job type and time band are on the published rate card.

How do you know if a drainage company has overcharged you?

You have probably been overcharged if the invoice is higher than the price you agreed, includes work you did not approve, or bills time you cannot account for. A bill that is simply larger than you hoped is not the same thing.

Check the invoice for these warning signs:

• No price agreed at all. The engineer started work without telling you the cost or how it would be worked out.
• Extras you did not approve. Jetting, a camera survey, a second visit or a repair appears on the bill without anyone asking you first.
• Time that does not match. Two hours billed for a visit that lasted forty minutes, or travel time charged when you were quoted a price for the job on site.
• A repair sold without evidence. You were told the drain had collapsed or needed relining, but you were not shown footage.
• One lump sum. A single figure with no breakdown makes it impossible to check anything, and a reputable firm should be able to break it down on request.

What does the law say about a price you never agreed?

Under the Consumer Rights Act 2015, if no price was agreed for a service, you only have to pay a reasonable price. The trader must also carry out the work with reasonable care and skill.

This matters because many drainage jobs start in a hurry, with a flooded yard or a toilet that will not flush, and the price is never pinned down. If that happened to you, the question is not what the firm chose to invoice but what a reasonable charge for that job would be. Published rate cards from other London firms, written quotes you received at the time and the actual time on site are all useful evidence. Where a price was agreed, that price stands, and a firm cannot add to it later for work you did not approve.

If the work itself was poor, for example the blockage came straight back because it was never properly cleared, the same Act lets you ask the firm to put it right at no extra cost, and if that is not possible or does not happen within a reasonable time, you can ask for a price reduction.

How do you dispute a drainage invoice?

Raise it in writing, quickly, and say exactly which lines you dispute and why. A specific complaint is much easier to resolve than a general one.

• Ask for the breakdown. Request an itemised invoice showing attendance, labour, equipment, materials and any time band applied.
• Gather your evidence. Save the quote, text messages, emails, call logs and photographs. Note the time the engineer arrived and left.
• Write to the company. Set out the price you agreed or the price you consider reasonable, the lines you dispute, and what you want: a corrected invoice or a refund of the difference. Give a clear deadline.
• Pay what is not in dispute. Paying the undisputed part shows good faith and makes it harder for the firm to treat you as simply refusing to pay.
• Escalate if needed. If the firm does not respond, contact the Citizens Advice consumer helpline, which can pass the case to Trading Standards. For unresolved money disputes, the small claims track of the county court is the usual route.

Can you get your money back if you paid by card?

Often, yes. If you paid by debit card, your bank may be able to raise a chargeback. If you paid by credit card and the job cost more than £100, the card issuer can share liability with the trader under section 75 of the Consumer Credit Act 1974.

Both routes work best when you can show that you tried to settle it with the company first and that the charge breaks what was agreed. Contact your card issuer promptly, because chargeback schemes have time limits. Cash and bank transfers are far harder to recover, which is one reason to pay by card for any drainage job where the final price is not yet fixed.

When is a high bill not an overcharge?

When the price, time band and any extra work were all agreed before they happened. A night call-out, a longer job than expected with your consent, or a repair you approved after seeing the footage can all be expensive without being unfair.

Out-of-hours rates are the most common source of shock. Most drainage firms charge more for evenings and nights, and if you were told that band before the engineer set off, the rate stands. Equally, a job can change once the engineer sees the drain: a blockage turns out to be roots, or the pipe is broken. That is a normal part of drainage work, and the fair response is a new price put to you before anything more is done. Our guide on what a call-out fee should cover explains how attendance charges are normally structured, so you can tell whether yours was in line.

How do you avoid being overcharged next time?

Agree the price structure before the engineer travels, and get it in writing, even if that is a text message. The five minutes it takes are the best protection there is.

• Ask whether the price is fixed for the job or charged by time, and in what increments. Our comparison of fixed price and hourly drain unblocking shows where each model hides its extras.
• Confirm the time band that applies.
• Ask what jetting, a camera check or a second visit would cost if needed.
• Say clearly that no extra work should be done without your approval.
• Ask to see footage before agreeing to any repair.

A firm that is happy to answer those questions before it arrives is unlikely to surprise you afterwards. If you have a quote or an invoice you are unsure about, send it through our contact page and we will tell you honestly whether it looks in line with what the job usually involves.