Your gas company estimated your bill without reading the meter. Learn the Ofgem 12-month back-billing rule, how to challenge estimated charges, and claim corrections for past overbilling.
Quick Answer
Ofgem's 12-month rule limits back-billing for underestimation. If your supplier hasn't read your meter in years, you can dispute charges back to the last actual reading. Request a meter reading, submit a formal complaint, and escalate to Ofgem if the supplier refuses.
Contact your gas supplier and request an actual meter reading. Do not accept an estimate. Under Ofgem licence conditions, you have a right to annual readings.
2
Check for Overcharging
Compare the actual reading to your last actual reading. If bills were estimated in between, calculate what you should have paid. Demand a refund for overcharge.
3
Send Formal Complaint
File a written complaint citing breach of Gas Act 1986 and Ofgem licence conditions. Include evidence of estimated bills and the correction calculation.
4
Escalate to Ofgem
If unresolved after 8 weeks, file with Ofgem. Reference the 12-month rule and any evidence of systematic failure to read the meter.
Backed by UK Gas Regulation
Meter Reading
Gas Act 1986
Suppliers must provide actual meter readings at least annually. Estimated bills are provisional only, not legal billing.
Back-Billing Limit
Ofgem Standard Licence
Domestic customers cannot be back-billed more than 12 months for underestimation, except where supplier can prove customer fault or meter tampering.
Consumer Rights
Consumer Rights Act 2015
Unfair contract terms and charges are invalid. Persistent over-estimation is unfair. You can claim refunds going back 6 years.
Common Gas Meter Dispute Situations
📋
No Meter Read for Years
Bills estimated for 2-3+ years without an actual reading. Supplier says "no access" but makes no documented attempts.
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Over-Estimated Usage
Supplier's estimate consistently higher than your actual consumption. System overcharges you month after month.
❌
Refuses Access to Meter
You offer meter readings but supplier ignores them. Continues estimated billing. This is a breach of licence conditions.
📊
Wrong Tariff Applied
Meter reading disputed because bills applied wrong tariff rate. Estimated reading used to justify higher charges.
🏠
Smart Meter Not Activated
Smart meter installed but not reading remotely. Supplier continues manual estimates despite having automatic read capability.
⚙️
Sudden Back-Bill Beyond 12 Months
Supplier suddenly bills you for 18-24 months of back-charges after initial reading. Breaches 12-month rule.
Frequently Asked Questions
What is the Ofgem 12-month back-billing rule?▼
Ofgem's Standard Licence Condition 27 limits how far back energy suppliers can charge for bills based on underestimation (where the estimate was too high, now being corrected downward). For domestic customers, the limit is 12 months - suppliers cannot backbill beyond that unless they can prove customer fault (meter tampering) or fraud. If your supplier estimated your gas bill for 18+ months without reading the meter, they are in breach and cannot legally demand payment for more than 12 months back.
Can I dispute a gas bill based on estimated meter readings?▼
Yes, absolutely. Under Gas Act 1986 and Ofgem licence conditions, suppliers have a duty to obtain actual meter readings regularly - at least once per year for domestic customers. An estimate is not a bill - it is a provisional charge pending actual reading. If your supplier hasn't read your meter in 12+ months, they are in breach. You can request an immediate reading, dispute charges, and claim a refund for overbilling.
How far back can I claim for wrong meter reading charges?▼
For underestimation back-billing, Ofgem limits claims to 12 months. However, if you have evidence that the supplier systematically failed to read the meter for years (breaching licence conditions), you may claim further back under Consumer Rights Act 2015. In practice, you can claim back up to 6 years if you have clear evidence of overcharging. Ofgem or the supplier may offer negotiated settlement for longer periods.
What evidence do I need to dispute a meter reading?▼
Gather: (1) All bills from past 6 years - highlight those marked "estimated". (2) Actual meter readings you have taken yourself. (3) Proof of no access - any messages from supplier saying they cannot read meter, or your rejection of estimated readings. (4) Dates of the last actual reading. (5) Usage calculations - show what you should have paid based on actual consumption. (6) Correspondence requesting readings that supplier ignored.
What is the Gas Act 1986 requirement?▼
Gas Act 1986 established that suppliers are duty-bound to read customer meters. Ofgem's Standard Licence Condition 27 makes this explicit: domestic customers must receive at least one actual meter reading per year. Failure to do so is a material breach of the supplier's licence. Smart meters transmit readings automatically - if your supplier has a smart meter but claims no access, this is indefensible and grounds for complaint to Ofgem.
What happens after I file a complaint with Ofgem?▼
You must first give the supplier 8 weeks to resolve and issue a deadlock letter. Then file with Ofgem at www.ofgem.gov.uk/complaint. Ofgem will investigate whether the supplier breached licence conditions. If they find a breach, Ofgem can: (1) force a refund, (2) order the supplier to correct future billing, (3) award compensation for distress. The investigation takes 2-6 months. Ofgem decisions are legally binding.
Disputing a Gas Meter Reading?
Use Fightingback's bills tool to document your dispute, calculate what you're owed, and generate a formal complaint letter to send to your supplier.