Cheapest fixed gas tariff to switch to in the UK today

Find the lowest estimated fixed-rate gas deals available for your home, with clear checks for meter type, region and payment method. Compare whole-of-market prices and switch with confidence.

  • Fixed gas prices vary by region, meter type and payment method — we’ll show you what matters.
  • See when a fixed tariff can beat a variable tariff (and when it usually won’t).
  • Get an estimated yearly cost for your usage before you switch.
Get your fixed gas quote How fixed tariffs work

Estimates are based on the details you enter and supplier terms available at the time. Prices and eligibility can change quickly.

Fast answer: what “cheapest fixed gas tariff” means in the UK

There isn’t one single cheapest fixed gas tariff for everyone in the UK. The cheapest fixed deal for you depends on:

Your region

Gas distribution regions affect standing charges and unit rates. A good deal in London may not be the cheapest in the North West.

Your meter & setup

Smart meter / traditional meter, prepayment, and Economy-type setups can change the tariffs you’re eligible for.

How you pay

Direct Debit deals can price differently from pay-on-receipt-of-bill or prepay options.

Key takeaway: The “cheapest” fixed tariff is the one with the lowest estimated annual cost for your home after checking standing charge, unit rate, contract length and exit fees.

Quick signs a fixed gas tariff may suit you

  • You want predictable bills for a set period (often 12–24 months).
  • You can pass a basic affordability check for Direct Debit.
  • You’re happy to commit, even if the market falls later.

When a fixed deal may not be best

  • You expect to move soon (exit fees can apply).
  • You’re on a prepayment meter with limited fixed options.
  • You’re already on a good fix and would pay exit fees to leave early.

Compare fixed gas tariffs (whole-of-market) and switch

Use the form to see fixed-rate gas options available for your home. We’ll match deals using the information below and show estimated costs so you can compare like-for-like.

Before you start: If you don’t know your usage, that’s OK. An estimate still helps, but the final bill depends on your actual consumption and your supplier’s readings.

How fixed gas tariffs work (plain English)

What’s fixed?
Your unit rate (p/kWh) and standing charge (p/day) are usually set for the contract term. Some tariffs fix one element but not the other—always check the tariff information label.
How long do fixes last?
Commonly 12 or 24 months. Longer fixes can offer certainty but may have higher exit fees.
What happens at the end?
You typically move onto the supplier’s standard variable tariff (SVT) unless you switch or agree a new deal. Setting a reminder near the end date helps avoid overpaying.

Get your fixed gas quote

Tell us where you live and how to contact you. We’ll use this to return eligible fixed-rate gas options.

Used to match you to the correct gas distribution region and available tariffs.

No obligation. Eligibility and prices vary by supplier.

Privacy note: We use your details to provide your comparison and contact you about your quote. If you prefer, you can explore the guidance below before sharing details.

How to compare fixed gas tariffs (the parts that change the price)

When you see “cheapest fixed gas tariff” headlines, the detail is usually in the small print. Use the table below to compare deals the way a bill is calculated.

Compare item Why it matters What to look for
Unit rate (p/kWh) This is what you pay per unit of gas used. High usage homes feel changes here most. Lower is generally better, but check standing charge too.
Standing charge (p/day) A daily fee regardless of usage. Low usage homes can overpay if this is high. Compare the annual total: standing charge × 365.
Contract length Longer fixes can give certainty but reduce flexibility if prices fall. 12–24 months is common; match it to your plans.
Exit fees Fees may apply if you leave before the end of the fix (e.g., per fuel). Check fee amount and whether it applies near the end date.
Payment method Direct Debit can price differently from pay on receipt or prepay. Compare tariffs under the same payment method.
Eligibility & meter type Some fixes are limited by meter type, credit checks, or smart meter requirements. Confirm your meter and account type before applying.

Decision checklist: is a fixed gas tariff right for you?

  • I value certainty more than chasing the lowest possible price later.
  • I’m likely to stay at this property for the contract length (or I’ve checked move-home rules).
  • I’ve checked exit fees and can live with them if I change my mind.
  • I know my payment method (Direct Debit / bill / prepay) and I’m comparing like-for-like.
  • I’ve considered dual fuel (gas + electricity) versus gas-only pricing for my situation.

Two realistic scenarios (with numbers)

These examples show how “cheapest” can change based on usage and standing charge. They are illustrative (not live market prices).

Scenario A: low gas use flat

  • Assumed use: 6,000 kWh/year
  • Tariff 1: 7.2p/kWh + 40p/day → estimated annual = (6,000×£0.072) + (365×£0.40) = £578
  • Tariff 2: 7.9p/kWh + 26p/day → estimated annual = (6,000×£0.079) + (365×£0.26) = £569

Even with a higher unit rate, Tariff 2 comes out cheaper because the standing charge is lower.

Scenario B: family home with higher gas use

  • Assumed use: 18,000 kWh/year
  • Tariff 1: 7.2p/kWh + 40p/day → estimated annual = (18,000×£0.072) + (365×£0.40) = £1,442
  • Tariff 2: 7.9p/kWh + 26p/day → estimated annual = (18,000×£0.079) + (365×£0.26) = £1,517

At higher usage, the lower unit rate in Tariff 1 wins, even with a higher standing charge.

Important: Your actual costs depend on your kWh use, your region’s charges, VAT and supplier terms. Always compare estimated annual cost for your own details.

Costs, exclusions and common pitfalls (so you don’t pick the wrong “cheap” fix)

Fixed deals can be great for budgeting, but the cheapest-looking headline rate isn’t always the cheapest overall. These are the most common reasons people end up disappointed.

1) Comparing unit rates only

A low unit rate can come with a high standing charge. Always compare estimated annual cost for your usage.

2) Exit fees eating the savings

If you switch again soon, exit fees can cancel out any benefit. Check fees per fuel and the end-date rules.

3) Not matching payment method

Some tariffs price differently for Direct Debit vs. pay-on-receipt. Compare like-for-like or you’ll mis-rank deals.

4) Prepayment and meter constraints

If you’re on a prepayment meter, fixed options may be fewer. Switching meter type can take time and isn’t always possible.

Gas-only vs dual fuel

Sometimes a supplier offers a better deal when you take gas + electricity together. But dual fuel isn’t automatically cheaper—compare both ways if you can.

Moving home during a fix

Some suppliers may let you transfer your tariff to a new address; others may end it and apply conditions. Ask before you commit if a move is likely.

A practical “cheap fix” sense-check (60 seconds)

  1. Check it’s a fixed tariff for both unit rate and standing charge (or understand what’s fixed).
  2. Confirm your region, payment method, and meter type match the tariff.
  3. Compare estimated annual cost, not just p/kWh.
  4. Read the exit fee and contract length.
  5. Note the end date and set a reminder to review before it ends.

FAQs: cheapest fixed gas tariff switching in the UK

Is there a single cheapest fixed gas tariff in the UK today?

No. “Cheapest” depends on your region, meter type and how much gas you use. Two homes can see different cheapest options even on the same day.

Will switching interrupt my gas supply?

Switching supplier should not interrupt your supply. Your gas still comes through the same pipes; the change is mainly billing and who you pay.

How long does a fixed tariff switch take in the UK?

Timeframes vary by supplier and circumstances. Many switches complete within days to a few weeks, but issues like meter details, debt and address checks can slow things down.

Can tenants switch to a cheaper fixed gas tariff?

Often yes, as long as you pay the energy bill and your tenancy agreement allows it. If bills are included in rent, you usually can’t change supplier.

Do fixed tariffs protect me if prices rise?

Typically, yes for the parts that are fixed (unit rate and/or standing charge) until your contract ends. But always check what the supplier has fixed, and what events (rare) might allow changes.

What if I have a prepayment meter?

You may have fewer fixed options and need to compare carefully. Some suppliers offer competitive prepay tariffs, but availability depends on your meter and postcode.

How do I find my gas usage (kWh)?

Check your latest bill or online account for annual consumption in kWh. If you only have m³ readings, your supplier converts them into kWh on the bill.

Should I switch if I’m in debt to my current supplier?

It depends. Some debt situations may limit switching, especially on prepayment meters. Get advice first if you’re unsure. Citizens Advice explains your options and support available.

Tip: If you’re comparing “gas only”, also sanity-check whether your electricity deal will change if you move away from a dual fuel bundle.

Trust, methodology and sources

Editorial accountability

How we assess “cheapest fixed gas tariff”

We focus on what typically makes a deal cheapest for a specific household, not a headline rate. In practice, the “cheapest fixed gas tariff” is the fixed-rate tariff with the lowest estimated annual cost for your details at the time you compare.

  • Inputs we consider: postcode/region, payment method (e.g. Direct Debit), meter type (where relevant), and estimated annual gas usage (kWh).
  • Price components: unit rate (p/kWh) + standing charge (p/day) + VAT (where applicable) to produce an estimated annual total.
  • Contract terms: fix length, exit fees, and eligibility constraints are highlighted because they affect the real-world “cost to switch again”.
  • What we don’t do on this page: publish a single live “cheapest tariff” claim, because availability and pricing can change by region and customer profile, sometimes daily.

Limitations and caveats (important)

  • All costs shown in examples are estimates. Your actual bills depend on actual usage, meter readings and supplier billing cycles.
  • Some tariffs may not be available to all customers (credit checks, meter requirements, prepayment restrictions, or supplier acceptance criteria).
  • Regional network charges and standing charges vary across the UK, so results differ by postcode.
  • Market conditions change; always re-check the tariff information and terms before completing a switch.

UK sources we rely on

Ready to check the cheapest fixed gas tariff for your postcode?

Get a tailored comparison based on your region, payment method and eligibility. No misleading “one-size-fits-all” answers—just the deals that fit your home.

Get your fixed gas quote Re-check the checklist

Remember: the “cheapest” fixed deal is the lowest estimated annual cost for your usage and region, with terms you’re happy to stick with.

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Updated on 4 May 2026