Cheapest gas tariff for UK homes: how to find one you can switch to now

Key takeaways (most useful checks)

• Compare total cost: (unit rate × your kWh) + (standing charge × 365).
• Check exit fees: can wipe out a short-term saving if you leave early.
• Watch the standing charge: low unit rates often come with higher standing charges.
• Match to your risk: fixed gives certainty; variable/tracker can change.

If you want the quickest route

1. Find your annual gas usage (kWh) from a bill (or use an estimate).
2. Compare tariffs in your postcode with the same payment method.
3. Choose based on total cost + contract terms (fees, length, price changes).
4. Switch (usually completes in around 5 working days for credit meters, but can vary).

Good to know

Unit rate

Cost per kWh of gas you use.

Standing charge

Daily fixed charge (network + metering + supplier costs).

Estimated annual cost

A calculation using your usage (or typical usage) and current rates.

Compare cheap gas tariffs in your area (and switch)

Tell us a few details and we’ll show whole-of-market options that match your home. We focus on clear pricing and contract terms so you can make a confident choice.

What you’ll need (takes 2 minutes)

• Your postcode (to pull the right regional rates)
• Your meter type (credit / prepayment; smart meter if you have one)
• Rough gas usage (kWh) if you know it, or we can use a typical estimate
• How you prefer to pay (Direct Debit is often priced lower, but not always)

We’ll use your details to return quotes and contact you about your options. You can ask us to stop at any time.

Get personalised gas quotes

Enter your details to compare whole-of-market tariffs available in your area.

Scenario A: Low gas use flat (10,000 kWh/year)

Assumptions: single occupant flat, credit meter, paying by Direct Debit, comparison uses annual usage 10,000 kWh.

Working (example): Tariff 1 ≈ (10,000×£0.068) + (365×£0.40) = £680 + £146 = £826.

What this shows: a slightly higher unit rate can still be cheaper if the standing charge is meaningfully lower.

Scenario B: Family home with higher use (18,000 kWh/year)

Assumptions: 3–4 person household, gas heating, credit meter, Direct Debit, annual usage 18,000 kWh.

Working (example): Tariff 1 ≈ (18,000×£0.068) + (365×£0.40) = £1,224 + £146 = £1,370.

What this shows: as usage rises, the unit rate matters more, so a low unit-rate tariff can win even with a higher standing charge.

Decision checklist: who a “cheapest” tariff usually suits

• You can compare on your kWh usage (not a random average).
• You’re comfortable with the contract length (or there’s no exit fee).
• The tariff is available for your postcode and meter type.
• You’ve checked standing charge is reasonable for your usage level.
• You understand how and when the price can change (variable/tracker).

Who it may not suit (or needs extra checks)

• If you may move soon and the tariff has exit fees or transfer restrictions.
• If you have a prepayment meter and the tariff is credit-meter only.
• If you’re on a debt repayment plan and need to confirm switching eligibility.
• If the “cheap” deal relies on bundles (e.g., dual fuel) you don’t want.
• If a low unit rate is offset by a high standing charge and your gas use is low.

1) Standing charge differences by region

Standing charges vary across Great Britain and can change over time. The “cheapest” tariff in one area may not be cheapest in another. Always compare using your postcode.

2) Exit fees and “intro” pricing

Fixed deals often have exit fees. If you switch again before the end date, fees can reduce or remove any saving. Also check whether a deal has a time-limited price or reverts to a different rate.

3) Payment method pricing

Many suppliers price Direct Debit differently from pay-on-receipt. If you select the “cheapest” Direct Debit option but prefer quarterly billing, your cheapest available tariff may change.

4) Meter type limitations (credit vs prepay vs smart)

Some tariffs are credit-meter only. Prepayment customers may see fewer options, and some cheaper deals may require a smart meter capable of smart prepay. If you’re not sure what you have, we recommend checking your bill or supplier account.

5) Moving home mid-contract

If you move, you may be able to transfer your tariff, but it depends on the supplier and whether they serve the new address. If transfer isn’t possible, you might be charged an exit fee.

6) Debt and switching rules

If you owe your current supplier money, you may still be able to switch. Rules can differ by meter type and debt level. If you’re in difficulty, it’s worth getting independent help before you switch.

1) Is the cheapest gas tariff always a fixed deal?

No. A fixed tariff can be cheapest for some households at a given time, but variable or tracker tariffs can sometimes be cheaper initially. The trade-off is certainty: fixed deals usually protect you from price rises for the contract term, while variable/tracker prices can change.

2) How do I know my annual gas usage (kWh)?

Look at a recent bill or your online account: it often shows annual usage in kWh (sometimes called “consumption”). If you only have meter readings, suppliers convert volume (m³/ft³) into kWh on your bill.

3) Can I switch gas supplier if I rent?

In most cases, yes—if you pay the energy bills and are the named account holder. If bills are included in your rent or the landlord controls the supply, you may not be able to switch. Check your tenancy agreement and speak to your landlord/agent if unsure.

4) How long does a gas switch take in the UK?

Many credit-meter switches complete in around 5 working days, but timings can vary. If there are account issues, meter changes, or complex setups, it may take longer. Your new supplier should confirm your switch date.

5) Will my gas be cut off when I switch?

No—switching supplier doesn’t interrupt your physical gas supply. The pipes and network stay the same; only the company billing you changes.

6) Why do I see different “cheapest” results on different comparison sites?

Results can differ due to postcode, payment method, meter type assumptions, usage estimates, and which tariffs are available through each service. Always check what assumptions the quote uses and compare total annual cost like-for-like.

7) Are prepayment gas tariffs ever the cheapest?

They can be competitive, but prepayment customers often have fewer tariff choices. If you have (or can get) a smart meter with smart prepay, more options may be available. Availability varies by supplier and region.

8) Should I choose gas-only or dual fuel to get the cheapest price?

It depends. Some suppliers price dual fuel more keenly, but not always. If you can get a great gas-only deal and keep a strong electricity tariff elsewhere, that may be cheaper overall. Compare total costs and contract terms across both fuels.

Page details

Written by

EnergyPlus Editorial Team

Reviewed by

Energy Specialist

Last updated

May 2026

How we assess what counts as “cheapest”

We aim to help you find a tariff you can realistically switch to, not just a headline-grabbing price. When we say “cheapest”, we mean lowest estimated annual cost for a specific home setup—after including the standing charge and any known fees—based on information the user provides.

• Inputs we prioritise: postcode (regional pricing), payment method, meter type, and your annual usage (kWh).
• Cost basis: estimated annual cost = (unit rate × usage) + (standing charge × 365).
• Contract checks: exit fees, contract length, tariff type (fixed/variable/tracker), eligibility rules (e.g., online-only), and whether it’s gas-only or requires dual fuel.
• User fit: we highlight when a “cheap” tariff may suit high-usage homes but not low-usage homes (standing charge impact).