Switch to a cheaper gas-only tariff in the UK
If your electricity is already sorted (or you don’t need it), a gas-only tariff can be a straightforward way to reduce your heating costs—provided your meter type, payment method and supplier options line up. This guide explains who it suits, what to watch for, and how to compare fairly.
- Whole-of-market comparison approach (where available) with clear assumptions
- UK-specific pitfalls: standing charges, exit fees, meter types and Direct Debit rules
- Two realistic cost scenarios with worked numbers (estimated)
Estimates only. Availability and prices vary by postcode, meter type and payment method. Always check tariff terms, standing charges and any exit fees before you switch.
Fast answer: how to switch to cheaper gas only tariff UK
The quickest way to switch to cheaper gas only tariff UK is to compare gas-only unit rates and standing charges for your postcode and payment method, then apply and let the new supplier handle the switch—typically within 5 working days under Ofgem switching rules. It’s usually cheapest on Direct Debit, but only if exit fees, contract length and meter compatibility work for you.
Key takeaway 1
A “cheaper” gas tariff is usually the one with the lowest annual estimated cost for your usage—not the lowest unit rate alone. Standing charge differences can outweigh a cheaper p/kWh.
Key takeaway 2
Gas-only is most common where your electricity is with a different supplier (or you’re all-electric). You can still switch gas without moving electricity, but check for bundle discounts you might lose.
Key takeaway 3
Your meter type and payment method (credit meter vs prepay; smart vs traditional; Direct Debit vs pay on receipt) can restrict tariffs and change pricing.
Important: If you are on prepayment (prepay), in debt, or have a smart meter in prepay mode, options can be more limited. If you’re struggling to pay, see Citizens Advice for help before switching: Citizens Advice energy guidance.
Compare gas-only tariffs (and avoid the common traps)
A gas-only switch is like any other energy switch: you compare tariffs, apply, and your new supplier manages the process. What makes gas-only different is that you’re often comparing while your electricity stays put—which means you should look at the total household impact, not just the gas p/kWh.
What you’ll need (takes 2 minutes)
- Postcode
- Prices vary by region and network costs. A nearby postcode can price differently.
- Payment method
- Direct Debit is often cheapest. Pay on receipt and prepay can be higher and have fewer tariff options.
- Estimated annual gas use (kWh)
- If you don’t know it, use your annual statement, your online account, or recent bills. (We explain fallback estimates below.)
- Tariff details to check
- Standing charge, unit rate, fixed vs variable, contract length, and exit fees.
Not sure about your usage? A quick estimate is better than guessing. If you heat with gas and have a typical home, your annual gas usage may be around 10,000–12,000 kWh (medium) or higher for larger/older homes. Always replace estimates with your actual kWh when you can.
Get a gas-only quote
Share a few details and we’ll help you compare available gas tariffs for your home. This is a no-obligation enquiry and prices are shown as estimates.
How switching gas-only works (UK)
- Compare tariffs using your postcode, payment method and estimated annual gas usage (kWh).
- Apply to the new supplier (online or by phone). They’ll start the switch and contact your current supplier.
- Cooling-off period: you’ll usually have time to change your mind (check supplier terms).
- Switch completes: under Ofgem rules, most switches complete in about 5 working days, though exceptions can apply.
- Final bill and opening reading: submit meter readings if requested, and keep copies/photos for your records.
Will my gas be cut off? Switching supplier should not interrupt your gas supply. The pipes and network stay the same; only the billing supplier changes. See Ofgem’s guidance on switching: Ofgem energy switching advice.
Gas-only tariff comparison: what to check
Use this table to compare tariffs in a way that reflects what you’ll actually pay. The “best” option depends on your usage pattern and how long you plan to stay in the property.
| What you’re comparing | Why it matters | Quick rule of thumb | Common pitfall |
|---|---|---|---|
| Standing charge (p/day) | You pay this even if you use no gas. Big for low-usage households. | Low usage: prioritise a lower standing charge. | Choosing a low unit rate but high standing charge and paying more overall. |
| Unit rate (p/kWh) | This drives costs for medium/high gas users (heating-heavy homes). | High usage: unit rate usually matters most. | Comparing rates for the wrong payment method (e.g. Direct Debit vs pay on receipt). |
| Fixed vs variable | Fixed offers price certainty for a term; variable can change (often with the price cap when applicable). | If you value predictability, consider a fixed tariff with sensible exit fees. | Fixing for a long term without checking exit fees if you might move. |
| Exit fees | Leaving early can reduce or wipe out savings. | If you’re unsure about staying put, prefer lower/no exit fee. | Forgetting you may pay an exit fee even if you only move gas. |
| Billing & customer support | Bad billing can be costly in time and stress, especially around meter readings and move-ins. | Check supplier reputation and contact options if you prefer phone support. | Assuming every supplier handles smart meter readings the same way. |
Quick decision checklist: gas-only suits you if…
- You have mains gas and can provide (or estimate) annual kWh usage.
- Your electricity is already on a good tariff, or you want separate suppliers.
- You’re happy to compare annual cost (standing charge + unit rate), not just p/kWh.
- You can pay by Direct Debit (often the broadest tariff availability).
It might not suit you if…
- You currently get a meaningful dual-fuel discount that you’d lose by splitting.
- You’re on prepay and your tariff choice is limited (compare carefully first).
- You’re likely to move soon and the fixed tariff has high exit fees.
- You have a complex meter situation (e.g. related to communal heating or landlord supply).
Price cap caveat: Ofgem’s price cap limits what suppliers can charge on many default tariffs, but it is not a cap on your total bill and it doesn’t guarantee the cheapest deal for your usage. Learn more from Ofgem: Ofgem household energy advice.
Costs, exclusions and common pitfalls (UK gas-only)
To avoid switching and feeling worse off, check these items before you apply. Most issues come down to standing charges, contract terms, and eligibility linked to your meter and payment method.
1) Standing charges can dominate low usage
If you use little gas (e.g. cooking only, or you heat mostly with electricity), a tariff with a slightly higher unit rate but lower standing charge may be cheaper overall.
2) Exit fees can wipe out savings
Fixed tariffs often have exit fees. If you might move, or you’re not confident you’ll keep the tariff for the full term, prioritise low/no exit fees.
3) Direct Debit vs pay-on-receipt pricing
Many suppliers price Direct Debit lower. When comparing, make sure the quote matches how you intend to pay—otherwise the “cheapest” deal may not be available to you.
4) Prepayment and debt restrictions
If you’re on prepay or repaying debt through your meter, switching may be limited. Citizens Advice covers what to do if you’re in arrears: Get help paying your energy bills.
Two realistic scenarios (with numbers)
These are illustrative examples to show how standing charges and unit rates interact. They are not a forecast of market prices. We assume a single-rate gas tariff and no additional discounts.
Scenario A: low gas use (flat with gas hob only)
- Usage: 3,000 kWh/year (estimated)
- Tariff 1: 7.5p/kWh + 35p/day
- Tariff 2: 7.0p/kWh + 45p/day
Estimated annual cost
Tariff 1: (3,000 × £0.075) + (365 × £0.35) ≈ £352.75
Tariff 2: (3,000 × £0.070) + (365 × £0.45) ≈ £374.25
Even with a cheaper unit rate, the higher standing charge makes Tariff 2 cost more for low usage.
Scenario B: higher gas use (family home, gas heating)
- Usage: 15,000 kWh/year (estimated)
- Tariff 1: 7.5p/kWh + 35p/day
- Tariff 2: 7.0p/kWh + 45p/day
Estimated annual cost
Tariff 1: (15,000 × £0.075) + (365 × £0.35) ≈ £1,252.75
Tariff 2: (15,000 × £0.070) + (365 × £0.45) ≈ £1,214.25
For higher usage, the cheaper unit rate can outweigh the higher standing charge.
What these examples miss: real quotes can vary by region, supplier, tariff type, how you pay, and whether your meter setup is eligible. Always compare based on your own kWh and check the tariff’s full terms.
FAQs: switching to a cheaper gas-only tariff in the UK
Can I switch gas supplier without switching electricity?
Yes. In the UK you can switch your gas supplier and keep your electricity with a different supplier. Before you do, check whether you’ll lose any dual-fuel discount or benefit, and compare the combined household cost (gas + electricity) after the change.
How long does a gas-only switch take in the UK?
Many supplier switches complete within around 5 working days under Ofgem switching rules, but timings can vary depending on your circumstances. For example, meter issues, incorrect details, or specific account situations may delay completion. Your new supplier should confirm the expected switch date.
Will switching gas supplier affect my gas supply?
Switching supplier should not interrupt your gas supply. Your gas still comes through the same network pipes; only the company that bills you changes. You may be asked for a meter reading around the switch date to help produce an accurate final bill.
Is a gas-only tariff cheaper than dual fuel?
Not always. Dual-fuel can sometimes be cheaper (or simpler) if there’s a discount or if one supplier offers better combined pricing. Gas-only can be cheaper if your best gas deal is with a different supplier than your best electricity deal. The safest approach is to compare the total estimated annual cost for each setup.
Can I get a gas-only tariff if I’m on a prepayment meter?
Sometimes, but choice can be more limited and prices can differ compared with credit meters. If you’re on prepay (including smart meters operating in prepay mode), compare like-for-like prepay tariffs and check any eligibility restrictions. If you’re in debt, switching may be restricted until certain conditions are met.
What details do I need to compare gas-only tariffs accurately?
You’ll get the most accurate results with your postcode, how you pay (Direct Debit, pay on receipt, or prepay), and your annual gas usage in kWh from bills or your online account. Also check your current tariff’s standing charge, unit rate, end date (if fixed), and any exit fees.
Are there exit fees when switching gas-only?
There can be. Exit fees are most common on fixed tariffs and may apply if you leave before the end date, even if you only switch your gas. Always check your current tariff’s terms and factor any exit fee into your estimated savings before switching.
Should I submit meter readings when I switch gas supplier?
Yes, if asked. Providing a meter reading (and keeping a photo) can help ensure your final bill from the old supplier and your opening bill from the new supplier are accurate. Smart meters can send readings automatically, but it’s still worth checking that the switch readings match your records.
Trust, methodology and sources
Page ownership
- Written by: EnergyPlus Editorial Team
- Reviewed by: Energy Specialist
- Last updated: June 2026
How we assess “cheaper” gas-only tariffs
We focus on the factors that most affect your total annual cost and your ability to switch successfully:
- Estimated annual cost = (unit rate × annual kWh) + (standing charge × 365).
- Eligibility filters: postcode/region, payment method, meter type (credit vs prepay; smart vs traditional) and tariff availability.
- Risk factors: exit fees, contract length, and whether you may lose a dual-fuel benefit by splitting suppliers.
- User experience: billing accuracy considerations (e.g. switch readings) and the practical steps needed to complete a switch.
Limitations and caveats
- Prices change frequently; quotes are time-sensitive.
- Your actual bill depends on real kWh usage, meter readings and tariff terms.
- Some tariffs may not be available for prepay or certain meter setups.
- Switch timelines vary; 5 working days is typical, not guaranteed.
Sources (UK)
Ready to check if a gas-only switch could reduce your bills?
Compare estimated annual costs using your postcode and payment method. We’ll show options available for your home and highlight key terms like standing charges and exit fees.
Back to EV Charger