Cheapest gas-only tariff switch in the UK (right now)
Find out whether a gas-only tariff is actually the cheapest option for your home, what affects the price, and how to switch safely without nasty surprises (exit fees, meter rules, payment method changes).
- UK-focused guidance for homeowners and tenants (not business energy)
- Clear examples with numbers, plus a checklist to decide if gas-only suits you
- Compare whole-of-market deals by postcode and meter type in minutes
Prices and availability vary by region, meter type and payment method. “Cheapest” here means lowest estimated annual cost for your details at the time you compare.
Fast answer: what’s the cheapest gas-only tariff to switch to?
In the UK, there isn’t one single “cheapest gas-only tariff” that applies to everyone. The cheapest option depends on your postcode (regional network costs), meter type (standard vs smart vs prepay), payment method (Direct Debit is often cheapest), usage (kWh), and tariff structure (unit rate + standing charge, fixed vs variable).
Quick reality check: For many homes, the cheapest overall setup can be a dual fuel deal (gas + electricity), even if you’re mainly focused on gas. It’s still worth checking gas-only if you have a separate electricity arrangement you want to keep (for example, an EV tariff or a fixed-rate electricity deal).
Key takeaways
- Cheapest = lowest estimated annual cost for your details today (not a universal “best tariff”).
- Standing charge matters for low gas use; unit rate matters for higher use.
- Exit fees can wipe out short-term savings on fixed tariffs.
- Prepayment meters may have fewer tariff choices.
When gas-only often makes sense
- You want to keep a specialist electricity tariff (EV, heat pump, time-of-use).
- You’re switching only one fuel because the other has an exit fee.
- You’re in a rental and the electricity supplier is managed separately.
What you’ll need
- Postcode and address
- Gas meter type (smart / standard / prepay)
- Approx annual gas use in kWh (or bills)
- Preferred payment method
Compare gas-only tariffs by postcode (and switch)
Use the form to get a whole-of-market comparison for your home. We’ll match available deals to your details and show an estimated annual cost so you can spot the cheapest realistic option.
Tip: If you’re unsure of your annual gas usage, use a recent bill. Look for “kWh” (not £). If you only have £ amounts, we can still estimate, but kWh is more accurate.
How switching gas-only typically works (UK)
- You choose a gas tariff (fixed or variable) and confirm details.
- Cooling-off period usually applies (you can change your mind).
- Your new supplier handles the switch; your supply shouldn’t be interrupted.
- You’ll provide an opening meter reading (unless it’s a smart reading).
If you rent: you can usually switch if you pay the energy bills, but check your tenancy agreement for any restrictions on changing meters (for example, installing/removing prepay meters).
Get your gas-only quote
Gas-only vs dual fuel: what’s usually cheaper?
This table helps you decide what to compare first. Costs vary, but these are the common UK patterns we see when pricing by postcode, meter type and payment method.
| Option | Best for | Watch-outs | What to check before switching |
|---|---|---|---|
| Gas-only fixed tariff | You want price certainty for gas for 12–24 months. | Exit fees; may not be cheapest if prices fall; standing charge can be higher. | Exit fee amount, end date, and whether your meter/payment type is eligible. |
| Gas-only variable tariff | Flexibility (often no exit fee) and you can switch again easily. | Rates can change; “cheap today” might not stay cheap. | How often rates can change; any discounts tied to payment method. |
| Dual fuel tariff | You want one supplier and the best total cost across gas + electricity. | Electricity side could be worse than your current deal (e.g., EV tariff). | Compare total annual cost, not just gas unit rate; check both fuels’ standing charges. |
| Stay put (for now) | You’re within a fixed term with high exit fees, or moving soon. | You might overpay if you ignore better options when your fix ends. | Fix end date; notice of renewal; what your supplier will move you onto. |
Decision checklist: gas-only switching
- This is likely to suit you if…
- You’ve found a better gas unit rate/standing charge for your meter and payment type, and you’re keeping your electricity deal for a reason.
- It may not suit you if…
- A dual fuel bundle is cheaper overall, you’d lose a benefit on your electricity tariff, or exit fees mean you won’t break even.
Two realistic UK scenarios (with numbers)
These are illustrative examples to show how costs are compared. Your quotes will differ by region, tariff, and timing.
- Scenario A: Low gas use flat (10,000 kWh/year)
Current tariff: unit 7.2p/kWh, standing 33p/day → estimated annual = (10,000×£0.072) + (365×£0.33) = £720 + £120.45 = £840.45
New gas-only tariff: unit 6.8p/kWh, standing 41p/day → estimated annual = (10,000×£0.068) + (365×£0.41) = £680 + £149.65 = £829.65
Takeaway: even with a lower unit rate, a higher standing charge can reduce the benefit for low usage. - Scenario B: Family home (17,000 kWh/year)
Current tariff: unit 6.9p/kWh, standing 35p/day → estimated annual = (17,000×£0.069) + (365×£0.35) = £1,173 + £127.75 = £1,300.75
New gas-only fixed tariff: unit 6.4p/kWh, standing 35p/day → estimated annual = (17,000×£0.064) + (365×£0.35) = £1,088 + £127.75 = £1,215.75
Takeaway: for higher usage, unit rate differences often matter more than standing charge.
Important: Examples exclude any exit fees, discounts, and bill credit offers. Always check the tariff’s personal projection and the tariff end date.
Costs, exclusions and common pitfalls (gas-only switching)
The “cheapest” gas-only tariff on paper isn’t always the cheapest outcome after fees, eligibility checks and practical constraints. These are the most common issues UK households hit.
Exit fees on fixed tariffs
If you’re leaving a fixed term early, an exit fee can outweigh the savings. Check your current tariff’s end date and any early termination charges before switching.
Payment method price differences
Direct Debit tariffs are often cheaper than cash/cheque or some prepay options. If you switch payment method, make sure the total cost is still lower.
Meter type restrictions
Some deals are limited by meter type (smart, standard credit, prepayment). If you have a prepay meter, your choice may be narrower and prices may differ.
Standing charge vs unit rate trade-off
A tariff with a low unit rate can still cost more overall if the standing charge is higher—especially for small flats or low occupancy homes.
Moving home soon
If you’re moving in the next few months, a long fixed tariff could be inconvenient. Some suppliers may let you transfer, but it’s not always guaranteed.
Not comparing the whole picture
If you switch gas-only, don’t ignore electricity. A slightly higher gas cost can be offset by a much better electricity tariff (or vice versa).
Accuracy note: Your “estimated annual cost” will change if your usage estimate is off. If your actual consumption is higher or lower, your real bills will differ even on the same tariff.
FAQs: cheapest gas-only tariff switching (UK)
Can I have gas with one supplier and electricity with another?
Yes. In Great Britain you can split fuels. You’ll receive separate bills (or separate account sections) and each supplier sets its own Direct Debit and billing schedule.
Is a gas-only tariff usually cheaper than dual fuel?
Not always. Some suppliers price dual fuel competitively overall. The only reliable way to know is to compare estimated annual cost for gas-only and dual fuel using the same usage and payment method assumptions.
Do I need my MPRN to switch gas?
Usually not. Most comparisons can find your supply using your address and postcode. If there’s a mismatch (new build, flat conversions), your MPRN from a bill can help.
Will I lose gas supply during the switch?
A supplier switch should not interrupt your gas supply. The change is administrative. You may be asked for a meter reading on the switch date to keep billing accurate.
Can I switch gas if I have a prepayment meter?
Often yes, but tariff choice can be more limited and not all suppliers accept all prepayment setups. If you’re in debt to your current supplier, switching may be restricted until it’s resolved.
What if I’m in a rented property?
If you’re responsible for paying the energy bills, you can usually switch supplier. You may need permission for meter changes (for example, installing or removing a prepayment meter).
What does “standing charge” mean and why does it matter for gas-only?
It’s a daily fixed charge to cover network and metering costs. If you use little gas (for example, small flat or summer months), standing charge can make up a big share of your annual cost.
How do I know if a fixed tariff is worth it?
Compare the estimated annual cost against a variable option, then factor in: exit fees, how long you plan to stay in the property, and whether you value price certainty. There’s no guarantee a fix will be cheapest over time.
Trust, methodology and sources
Page ownership
- Written by: EnergyPlus Editorial Team
- Reviewed by: Energy Specialist
- Last updated: May 2026
How we assess “cheapest gas-only tariff”
When we use the word “cheapest” on this page, we mean: the tariff with the lowest estimated annual cost for the details you provide at the time you compare (postcode, meter type, usage, payment method).
Estimated annual cost is calculated using the standard structure:
Estimated annual cost = (unit rate × annual kWh) + (standing charge × 365)
We then help you check practical factors (exit fees, eligibility, tariff end date, and whether the deal is gas-only or dual fuel) before you decide.
Assumptions & limitations
- Quotes are based on the information you provide (especially usage and meter type).
- Tariffs can change or be withdrawn; availability varies by region and payment method.
- Some suppliers have additional eligibility checks (e.g., credit checks for certain payment methods).
- Any savings are estimated and not guaranteed.
UK sources we rely on
- Ofgem (UK energy regulator) – switching rules, consumer protections, and market guidance.
- Citizens Advice – energy – practical consumer advice on bills, switching and complaints.
- GOV.UK – official government information on energy support schemes (where applicable).
We recommend checking supplier T&Cs and the tariff information label for the most up-to-date rates and fees.
Ready to check the cheapest gas-only tariff for your home?
Compare whole-of-market options by postcode and meter type, with estimated annual costs and clear caveats—so you can switch with confidence.
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