Think a UK utility bill is wrong? Don't ignore it, and don't assume that a high total automatically means an overcharge. Check the readings, tariff, standing charges and account balance, then put the exact dispute in writing.

For gas and electricity in Great Britain, complain to the supplier first. If the complaint remains unresolved after eight weeks, or the supplier sends a deadlock letter sooner, you can usually take it to the Energy Ombudsman. Water complaints follow a separate route, and Northern Ireland has different regulatory arrangements.

This is general consumer information for domestic customers, not legal advice.

The quickest route for a disputed utility bill

1. Identify the disputed item. It might be an estimated reading, an incorrect tariff, a duplicated charge, an old balance, a wrong meter or a leak.
2. Collect evidence. Save the bill, dated meter photographs, earlier bills, payment records and all messages with the provider.
3. Contact the provider and ask for a formal complaint reference. A phone call can start the process, but confirm the dispute by email or letter.
4. Pay the amount you don't dispute, if you can. Ask the provider how to handle the disputed balance and request an affordable arrangement if necessary.
5. Escalate at the right time. Energy customers can normally use the Energy Ombudsman after eight weeks or a deadlock letter. Water customers need the relevant water complaints route.

A 14-day deadline in your letter is a reasonable request for a response. It isn't a universal legal deadline, and missing it doesn't usually give you an immediate right to escalate an energy complaint.

Check whether the problem is usage, price or account balance

A bill can rise even when your household's usage has not changed. Work through these checks before alleging a meter fault.

The amount marked as “total due” may include an older debit balance. Ask the provider to separate current usage, previous debt, payments, credits and any disputed charges.

Build a simple evidence table

A clear comparison often gets a faster answer than a long explanation:

For a gas account, also ask which conversion figures and meter details were used. Don't rely on a generic internet claim about meter tolerances. Ask the supplier what accuracy standard applies to your particular meter and whether a formal test is needed.

Free formal utility bill complaint letter template

Replace the text in square brackets and remove anything that doesn't apply.

[Your full name]
[Your address]
[Postcode]
[Email address]
[Phone number]

[Date]

[Provider name]
[Complaints address or email]

Account number: [account number]
Supply address: [address]
Subject: Formal complaint about disputed [gas/electricity/water] bill dated [date]

Dear Complaints Team,

Please log this as a formal complaint about my [gas/electricity/water] account.

The bill dated [date], covering [start date] to [end date], shows a balance of [amount]. I dispute [the whole bill/the charge of amount] because [brief, specific reason].

The bill records:
- Opening reading: [reading], shown as [actual or estimated]
- Closing reading: [reading], shown as [actual or estimated]
- Unit rate: [rate]
- Standing charge: [rate]
- Other disputed charge: [description and amount]

My evidence shows:
- Reading taken on [date]: [reading]
- Meter serial number: [number]
- Relevant earlier reading or bill: [details]
- Payments or credits not included: [details]
- Other evidence: [details]

Please:

1. Explain how the disputed charge was calculated.
2. Correct and reissue the bill using the verified readings, if appropriate.
3. Investigate the meter and explain whether a formal accuracy test is needed. Please tell me in advance whether any test charge could apply.
4. Review any charge for energy supplied more than 12 months before I was accurately billed and explain any back-billing exception you rely on.
5. Credit or refund any overpayment and remove fees caused by the billing error.
6. Confirm what I should pay while the disputed amount is being investigated and whether collection activity on that amount will be paused.
7. Send me the complaint reference and your written outcome.

Please reply within 14 calendar days, or tell me when I will receive a substantive response. If this energy complaint cannot be resolved, please issue a deadlock or final response letter when eligible so I can consider the Energy Ombudsman.

This letter disputes the calculation and is not an admission that the disputed amount is owed. I will pay the amount I do not dispute, or contact you to discuss an affordable arrangement.

Yours faithfully,

[Your name]

Attach the disputed bill, dated meter photographs, previous bills and proof of payments. Keep the original files and a copy of everything you send.

Water-bill wording

For a water account, replace the energy-specific paragraph with:

Please confirm whether the bill uses an actual or estimated reading, whether the property is metered or unmetered, and whether the charges relate to the correct occupier and billing period. Please also investigate any leak, meter or sewerage-charge issue and explain whether your leak-adjustment or assistance policy applies.

Don't claim that Ofgem's energy back-billing rule automatically applies to a water bill. Water companies use different rules and complaint schemes.

Short complaint email template

Subject: Formal complaint: disputed [energy or water] bill for account [number]

Dear Complaints Team,

I am disputing the [amount] charge on my bill dated [date], covering [period]. The bill shows [estimated reading/wrong reading/incorrect tariff/duplicate payment/old balance], but my evidence shows [short explanation].

Please log this as a formal complaint and:

• explain the calculation;
• correct the account if the charge is wrong;
• investigate the meter or missing payment if relevant;
• review any applicable back-billing protection;
• confirm what I should pay while this is investigated; and
• send me a written outcome and complaint reference.

I have attached [list of documents]. Please respond within 14 calendar days, or confirm the next response date.

Kind regards,
[Name]
[Account number]
[Supply address]

Phone script for a utility billing dispute

Use the call to create a record, not as the only evidence of your complaint.

“I'm calling to dispute the calculation on my [date] bill. The bill shows [provider reading or charge], while my dated reading or payment record shows [your evidence]. Please log this as a formal complaint and give me the reference number.”

Ask these questions:

• “Was the bill based on an actual or estimated reading?”
• “What readings, dates, unit rates and standing charges did you use?”
• “Does the account include an older balance or a payment that hasn't been allocated?”
• “Can you investigate the meter, and will any test fee apply?”
• “What should I pay while the disputed amount is under review?”
• “Will you pause collection activity or late fees on the disputed part?”
• “When will I receive a written outcome or deadlock letter?”

After the call, email a short summary: “As discussed today, I dispute [amount] for [reason]. You gave me complaint reference [number].” Save the email and call date.

UK rights that may apply

Energy back-billing

For domestic energy customers in Great Britain, Ofgem's back-billing protection generally prevents a supplier from charging for energy used more than 12 months before the supplier first told the customer accurately about the charge, where the supplier was responsible for the billing failure.

The protection is not an automatic cancellation of every old balance. An exception may apply if the customer unreasonably obstructed the supplier's ability to obtain readings or information, for example. Ask the supplier to identify the specific exception and the evidence it relies on.

The rule isn't limited to one payment method or meter type. If you pay by direct debit, your supplier generally should not increase payments to cover energy used more than 12 months ago when the back-billing protection applies. Keep proof of readings and communications in case the supplier says it could not bill you because of something you did.

Read the Citizens Advice guidance on unexpectedly high energy bills and the MoneySavingExpert explanation of energy back-billing for examples and exceptions.

Meter and smart-meter problems

An estimated bill isn't automatically unlawful, but it should be corrected when you provide a reliable reading. Send a clear photograph showing the display, meter serial number and date if possible.

If readings still look impossible, ask the provider to investigate the meter. A smart meter's communications fault, in-home display or supplier data feed may be different from a fault in the meter itself. Ask the provider to explain which data it used and whether it will arrange a test.

Don't tamper with a meter or remove it before the dispute is documented. Ask who will arrange the test, what it will involve and whether a charge could apply if the meter is found to be accurate.

The Consumer Rights Act 2015

The Consumer Rights Act can be relevant where a service has not been provided with reasonable care and skill. It doesn't set a universal refund, decide every meter-reading dispute or create a fixed compensation payment for a high bill.

Use the Act carefully. Describe the billing failure and evidence first, then ask for a specific remedy. The energy contract, meter information and sector rules will usually be more useful than simply stating that the provider has breached the Act.

Compensation

A refund for an overpayment is different from compensation for inconvenience or a service failure. Some regulated standards and supplier commitments can provide automatic payments for specific failures, but a fixed payment such as £40 isn't owed for every high bill, slow reply or smart-meter problem.

If you request compensation, explain the actual loss or service failure and ask the provider to identify the rule or policy under which it will pay. Don't present a suspected entitlement as guaranteed.

Affordability and vulnerability

Sometimes the bill is accurate but unaffordable. Say so clearly rather than presenting it only as a billing error. Ask about:

• an affordable payment plan;
• a review of your direct debit;
• hardship support;
• the Priority Services Register, if eligible; and
• energy or water social tariffs and assistance schemes.

Cancelling a direct debit can stop future collections but doesn't erase the underlying balance. If you cancel it, agree another payment method and keep paying any amount you accept as due.

Water bills use a different complaints route

Start with the water company named on the bill. Check whether the property is:

• metered or unmetered;
• billed from an actual or estimated reading;
• affected by a leak;
• charged for the correct occupier and dates; and
• receiving the correct clean-water and wastewater charges.

If the property is metered, photograph the reading and ask the company to investigate leaks and explain whether its leak-adjustment policy applies. If it is unmetered, ask how the charges were calculated because current consumption may not be the basis of the bill.

For customers in England and Wales, the usual independent consumer route is the Consumer Council for Water, with the Water Redress Scheme potentially available where the case meets its conditions. Follow the complaint and final-response instructions on the provider's correspondence. Scotland and Northern Ireland have separate arrangements.

The Energy Ombudsman is not the normal route for an ordinary water-billing dispute.

How to escalate an unresolved energy complaint

1. Finish the supplier's complaint process

Use the provider's complaints address, not only a general customer-service chat. Keep the complaint reference, dates, names and promised actions. Ask for a written explanation if the supplier says the bill is correct.

2. Wait eight weeks or request a deadlock letter

You can usually approach the Energy Ombudsman when eight weeks have passed since the formal complaint, or sooner if the supplier issues a deadlock or final response letter. A 14-day deadline in your own letter doesn't replace this sector timetable.

3. Submit the evidence in a short timeline

Include:

• the account and supply address;
• the disputed bill;
• your meter readings and photographs;
• earlier bills;
• payment evidence;
• complaint correspondence;
• the supplier's final response or deadlock letter; and
• the outcome you want.

The Energy Ombudsman is a free dispute-resolution service for eligible energy complaints. Check the final-response letter for the referral deadline; schemes commonly require a referral within 12 months of that letter.

4. Understand Ofgem's role

Ofgem sets and enforces energy-market rules, but it normally doesn't investigate an individual bill to order a refund. The supplier or the Energy Ombudsman is usually the relevant route for an individual remedy. You can still report a wider regulatory concern to Ofgem, but doing so doesn't replace your complaint.

Common mistakes that weaken a complaint

• Quoting a generic meter tolerance as proof. Ask for a test and the standard that applies to your meter.
• Treating every high bill as an overcharge. Separate usage, tariff changes, standing charges and old debt.
• Calling a 14-day request a legal deadline. It is a requested response date.
• Ignoring the bill while waiting. Pay the undisputed amount or seek an arrangement.
• Cancelling direct debit without a replacement plan. The underlying account balance remains.
• Sending only a phone complaint. Confirm the conversation in writing.
• Using energy back-billing rules for water. The sectors have different schemes.
• Demanding automatic compensation without a basis. Identify the applicable standard or actual loss.
• Missing the ombudsman deadline. Check the date printed on the final response.

Frequently asked questions

Can I insist on a response within 14 days?

You can request a response within 14 days, but that isn't generally the energy sector's final escalation deadline. The key energy milestones are a deadlock letter or eight weeks without resolution.

Can an energy supplier charge more than 12 months later?

It may be restricted from doing so under the energy back-billing rules if the supplier was responsible for failing to bill accurately. Exceptions can apply, so ask the supplier to explain the period and any exception it relies on.

Does a high bill prove that my meter is faulty?

No. A price change, estimated reading, leak, new appliance, incorrect account balance or tariff change can produce a high bill. Compare the underlying data before requesting a meter test.

Will Ofgem obtain my refund?

Usually not. Ofgem is the regulator, while the supplier and, after the relevant waiting period, the Energy Ombudsman handle individual disputes.

Can I use the Energy Ombudsman for a water bill?

Normally no. Follow the water company's complaints process and the relevant regional water-redress route instead.

Further reading

• Citizens Advice: If you think you've been charged too much for your energy
• MoneySavingExpert: What to do if you get an energy back-bill
• BBC: Challenging your energy bills