Cheapest fixed gas tariff UK: how to switch today

Find a fixed gas deal that’s genuinely cheaper for your home (not just on the headline unit rate). We explain what “cheapest” really means, what to check, and how to switch with confidence.

  • See what makes a fixed tariff cheaper for your meter, payment method and usage
  • Compare fixed vs variable with realistic examples (standing charge, unit rate, exit fees)
  • Switch online in minutes — we’ll highlight key terms to review before you commit
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Estimates shown are for guidance. Availability and prices vary by region, meter type and payment method. Always check tariff details and exit fees before switching.

Fast answer: what is the cheapest fixed gas tariff in the UK today?

There isn’t one single “cheapest fixed gas tariff” for everyone in the UK. The cheapest fixed tariff for your home depends on four things that can change the price you pay:

1) Your region

Gas distribution charges vary across the UK, so identical tariffs can cost different amounts depending on where you live.

2) Your meter type

Smart, standard credit and prepayment meters can have different tariff availability and pricing.

3) Payment method

Paying by Direct Debit is often (not always) cheaper than paying on receipt of bill or prepayment.

4) Your usage pattern

A low unit rate can be outweighed by a higher standing charge (or exit fees) depending on how much gas you use.

Key takeaway: If you want the cheapest fixed gas tariff, compare on estimated annual cost for your postcode, meter and payment method — then check the exit fee and how long the fix lasts.

When a fixed tariff is usually worth it

  • You want price certainty for 12–24 months
  • The tariff’s estimated annual cost is lower than your current plan
  • Exit fees are reasonable for your situation

When you might avoid fixing

  • You may move home soon
  • The deal has high exit fees
  • You’re eligible for support that’s easier on your current supplier (always check first)

Check the cheapest fixed gas tariffs for your postcode

Use our whole-of-market comparison to see fixed gas options available in your area. We’ll show you the estimated annual cost, key tariff terms and anything important to watch (like exit fees or meter restrictions).

Tip: Have your recent bill handy. If you know your annual kWh usage (or monthly cost), your results will be more accurate.

How switching works (UK homes)

  1. Compare: we use your postcode, meter and payment method to show available fixed gas tariffs.
  2. Choose: pick the plan that looks cheapest for your estimated usage, and review exit fees and tariff end date.
  3. Apply: complete the switch request. Your new supplier arranges the transfer.
  4. Cooling-off: you normally get a 14-day cooling-off period on distance sales.
  5. Supply continues: gas supply doesn’t stop during a switch; you’ll just get a final bill from your old supplier.

Important: If you’re in debt to your supplier, you may still be able to switch in some situations (for example under debt assignment rules). Check with your supplier or Citizens Advice if unsure.

Get your fixed gas quote

Tell us a few details and we’ll match you to available fixed gas tariffs. You’ll be able to review prices and key terms before choosing.

Start your comparison

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How to compare fixed gas tariffs (what “cheapest” really means)

A fixed tariff normally locks the unit rate (p/kWh) and standing charge (p/day) for a set period (for example 12 months). The cheapest fixed gas tariff is usually the one with the lowest estimated annual cost for your household — after accounting for standing charge and any exit fees.

What you’re comparing Why it matters What to look for Common trap
Estimated annual cost Combines standing charge + unit rate using your estimated usage. Use your bill kWh if possible; compare on the same payment method. Choosing solely on the lowest unit rate.
Standing charge Paid every day regardless of usage. Lower is often better for low users; check region-specific rates. A tariff that looks cheap but has a high daily charge.
Fix length Longer fixes can mean longer price certainty. Match length to your plans (moving home, budgeting, etc.). Locking in when you may need flexibility soon.
Exit fees You may pay to leave before the end date. Check fee per fuel and whether it applies in the last ~49 days. Being surprised by fees if you want to switch again.
Eligibility / meter limits Some tariffs exclude certain meters or payment methods. Confirm if prepay/smart requirements apply. Applying for a tariff you can’t actually get.

Mobile note: scroll the table horizontally to see all columns.

Decision checklist: a fixed tariff suits you if…

  • You prefer predictable bills and can commit for the fix length
  • The tariff’s estimated annual cost is lower than your current gas plan (or offers value via price certainty)
  • You’ve checked the standing charge and it still makes sense for your usage
  • Exit fees won’t be a problem if your circumstances change

A fixed tariff may not suit you if…

  • You’re likely to move or change tenancy soon
  • You’re unsure you can pass credit checks or set up Direct Debit (where required)
  • You’re on a prepayment meter and fixed options are limited in your area
  • You’re aiming to switch again quickly if prices fall and exit fees are high

Two realistic scenarios (with numbers)

These examples are illustrative. Prices vary by region and supplier, and the gas price cap applies to standard variable tariffs rather than fixed deals. We’re using simple arithmetic so you can see the moving parts.

Scenario A: Lower-usage flat (Direct Debit)

Estimated annual usage
8,000 kWh
Tariff 1 (fixed): unit rate
6.6p/kWh
Tariff 1 (fixed): standing charge
32p/day
Estimated annual cost
£645

How we got £645: (8,000 × £0.066) + (365 × £0.32) = £528 + £116.80 ≈ £645.

What to watch: On low usage, the standing charge is a bigger share of your bill. A “cheapest unit rate” deal may not be cheapest overall.

Scenario B: Family home (higher usage)

Estimated annual usage
18,000 kWh
Tariff 2 (fixed): unit rate
6.1p/kWh
Tariff 2 (fixed): standing charge
36p/day
Estimated annual cost
£1,228

How we got £1,228: (18,000 × £0.061) + (365 × £0.36) = £1,098 + £131.40 ≈ £1,229.

What to watch: On higher usage, unit rate differences matter more. A slightly higher standing charge may be acceptable if the unit rate is meaningfully lower.

Caveat: Many households pay for dual fuel (gas + electricity). Sometimes the cheapest gas-only deal isn’t the cheapest overall once electricity pricing is included. Compare your full household energy cost if you can.

Costs, exclusions and common pitfalls (fixed gas)

Fixed tariffs can be great for budgeting, but the “cheapest” headline can hide conditions. Here are the checks we recommend before you switch.

Exit fees

Many fixed deals charge an exit fee if you leave early. Check whether it’s per fuel and whether it’s waived near the end of the tariff.

Standing charge shock

A low unit rate can be offset by a high standing charge, especially for smaller properties or warmer winters.

Payment method restrictions

Some prices assume monthly Direct Debit. If you prefer to pay on receipt of bill, costs may be higher or the tariff may not be available.

Prepayment meter availability

Fixed options can be limited on prepay. If you’re considering changing meter type, check eligibility, credit checks and timelines.

Moving home

If you move, you may not be able to take the tariff with you. Ask the new supplier what happens at your new address and whether fees apply.

Deals that exclude “gas-only”

Some tariffs are better value as dual fuel. Always compare the combined annual cost if you’ll switch both fuels.

Practical check before switching: Look up your current tariff’s end date and any exit fees. If you’re within the final weeks, you may be able to switch without paying exit fees (terms vary by supplier).

Quick “cheapest fixed gas” sanity check

  • Is the tariff actually fixed? Confirm which charges are fixed (unit rate and standing charge) and for how long.
  • Is the estimate based on your usage? If the comparison assumes average usage, the “cheapest” can change.
  • Does it match your payment method? Direct Debit vs receipt of bill can change pricing.
  • Any add-ons? Boiler cover or extras can raise costs — decide if you want them.
  • Exit fee vs likely savings: If you may switch again soon, an exit fee can wipe out any benefit.

FAQs: cheapest fixed gas tariff UK

Can I get a gas-only fixed tariff?

Often yes, but availability varies by supplier and region. In many cases, suppliers price more competitively for dual fuel. If you only want gas, compare the gas-only annual estimate and also check whether your electricity tariff would change or remain as-is.

Is a fixed tariff protected by the Ofgem price cap?

The Ofgem price cap applies to default tariffs (such as standard variable tariffs) rather than fixed deals. Fixed tariffs are priced by suppliers and can be above or below the cap level. Always compare based on your estimated annual cost and the terms.

Will switching interrupt my gas supply?

No — your gas supply continues during a normal supplier switch. You’ll still receive gas through the same pipes. The change is billing and who supplies you commercially.

How long does it take to switch gas supplier in the UK?

Switching times can vary, but many standard switches complete within days to a few weeks depending on your circumstances (for example, meter details, objections, or outstanding issues). You’ll normally get a confirmed switch date from the new supplier.

Can I switch if I have a prepayment meter?

Yes in many cases, but tariff choice can be more limited. Some suppliers require a smart prepayment meter or have different pricing. If you’re in debt, you may have restrictions, but switching can still be possible in some situations.

What if I’m renting — can I switch my gas tariff?

If you pay the energy bills and the account is in your name, you can usually switch. If bills are included in rent, or your landlord controls the supply, you typically can’t change supplier. If you’re unsure, check your tenancy agreement and who the current account holder is.

Do fixed gas tariffs include boiler cover?

Usually no — boiler cover is typically a separate add-on or a separate product. If a tariff includes extras, check the total cost and whether you can remove the add-on. Don’t assume “cheapest” includes service plans.

What details do I need to switch?

A postcode, contact details, and ideally your gas usage (kWh) from a recent bill. Suppliers may also ask for your payment preferences and (sometimes) meter details. If you don’t know your usage, you can still compare using estimates, but results will be less precise.

Trust, methodology and sources

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Last updated
April 2026

How we assess “cheapest fixed gas tariff”

We focus on what most UK households actually pay, not just the headline unit rate:

  • Estimated annual cost (unit rate × estimated kWh usage + standing charge × 365 days)
  • Tariff type and length (fixed term, what is fixed, when it ends)
  • Exit fees and key terms that affect real-world flexibility
  • Eligibility (region, meter type, payment method)

Limitations: Any “cheapest” result can change daily as suppliers update pricing and availability. Your final cost depends on actual usage, meter reads, and any changes to your household circumstances.

Sources (UK)

We link to third-party sources for transparency. Policies and guidance can change, so always check the latest official pages.

Ready to check the cheapest fixed gas deal for your home?

Get a quote based on your postcode, meter type and payment method. You’ll see estimated annual costs and key terms before making a decision.

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Reminder: prices are estimates and can change. Always review tariff details, including exit fees and eligibility, before switching.

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Updated on 21 Apr 2026