Cheapest no lock-in home energy tariff in the UK (how to find it)
No lock-in tariffs can be great for flexibility, but the “cheapest” depends on your meter, region, usage and payment method. This guide shows how to compare properly and avoid common traps.
- See what “no lock-in” really means (and what still costs money)
- Compare tariff types (SVT, fixed, tracker, time-of-use) without the jargon
- Use our quick form to check whole-of-market options available for your postcode
Prices are estimates and change frequently. Availability depends on meter type, region, credit checks and supplier criteria.
Fast answer: what’s the cheapest no lock-in tariff?
In the UK, the cheapest no lock-in option is usually the tariff with the lowest unit rates (p/kWh) and standing charge (p/day) available for your region and meter type that has no exit fees. There isn’t one single “cheapest” tariff for everyone.
Important: “No lock-in” normally means no exit fees. It does not always mean prices won’t change (e.g., SVT, tracker and time-of-use rates can move).
What to look for
- Exit fees: £0 (or clearly stated)
- Rates: unit rate + standing charge
- Payment: Direct Debit vs pay-on-receipt vs prepay
- Meter fit: smart, credit, prepay, Economy 7
Tariffs that are often “no lock-in”
- Standard Variable Tariff (SVT): flexible, rates can change
- Tracker: follows a published formula; can move daily
- Some fixed deals: fixed price but with £0 exit fees (varies)
Quick way to decide
If you may move home soon, expect to switch again, or want the option to leave if prices drop, prioritise £0 exit fees and low standing charge.
Check no lock-in tariffs available for your home
We’ll use your postcode and a few details to check whole-of-market options and highlight tariffs that are flexible (for example, £0 exit fees) where available.
Tip: Have a recent bill handy. If you don’t know your usage, we can still help — results will be based on typical assumptions and refined once you confirm details.
What you’ll need (2 minutes)
- Postcode (region affects standing charge and unit rates)
- Payment method (Direct Debit is often lowest)
- Meter type (credit, prepay, Economy 7, smart)
Get your quote
How to find the cheapest no lock-in tariff (without getting caught out)
1) Confirm what “no lock-in” means
Look for exit fees and contract end date. Many flexible tariffs are ongoing (no fixed term), but some fixed tariffs have a term and still let you leave for £0.
2) Compare on annual cost, not headline price
The cheapest tariff for a low user can be different from the cheapest tariff for a high user. Standing charges matter more the less energy you use.
3) Check meter and payment eligibility
Some tariffs are only for smart meters, exclude prepay, or require Direct Debit. That affects what’s “cheapest” for your home.
4) Decide how much price movement you can tolerate
Flexible deals can change price. Trackers and time-of-use tariffs can move more often than SVTs. Cheapest today isn’t always cheapest over the next 3–12 months.
Two realistic scenarios (with numbers)
These examples show why the cheapest no lock-in tariff depends on usage mix. Figures are illustrative and exclude any one-off credits/discounts.
Scenario A: Low user in a flat (electricity only)
Why it matters: for low users, a lower standing charge can outweigh a higher unit rate.
Scenario B: Family home (dual fuel, higher use)
Caveat: a tracker may be cheaper today but can rise; a £0 exit fee helps you leave if it stops being competitive.
When a no lock-in tariff is a good fit
- You may move home within 6–12 months
- You want freedom to switch quickly if prices drop
- You’re unsure whether you’ll keep Direct Debit or your meter may change
- You’re testing a tracker or time-of-use tariff and want an easy exit
When it may not suit you
- You prefer maximum bill certainty and don’t want rates changing
- You’re tempted by a short-term cheap rate but would struggle if it rose
- You’re on prepay and have limited tariff availability (still worth comparing)
Reality check: £0 exit fees don’t guarantee you’ll save money. The cheapest option is the best combination of rates, eligibility and how long you expect to stay on it.
Compare no lock-in tariff types (UK homes)
If you want flexibility, you’re typically choosing between an SVT, a tracker, a time-of-use tariff, or a fixed deal with £0 exit fees. This table summarises what changes, what doesn’t, and what to check.
| Tariff type | Typical exit fee | How prices move | Who it suits | Watch-outs |
|---|---|---|---|---|
| SVT (Standard Variable) | Usually £0 | Supplier can change rates (often after price cap updates) | People who want flexibility and simplicity | Not always the cheapest; standing charge can be high in some regions |
| Fixed (with £0 exit fee) | Can be £0 (varies) | Unit rates/standing charge fixed for the term (check exact T&Cs) | People who want more predictability but still an exit option | Intro offers can be time-limited; check what happens at end of term |
| Tracker | Often £0 | Moves with a published formula (can change daily/weekly) | Comfortable with price movement and monitoring | Bills can rise; some have price caps/ceilings, some don’t |
| Time-of-use (e.g., off-peak) | Often £0 | Different prices by time/day; may change with notice | Smart meter homes that can shift usage (EV, washing, heating) | Peak rates may be higher; not ideal if you can’t move usage |
Decision checklist (printable)
- Is the exit fee definitely £0 for gas and electricity?
- Are the unit rates and standing charges shown for my region?
- Does it require Direct Debit or a smart meter?
- Is there a discount that ends after a few months?
- What happens when the deal ends (roll onto SVT, new rates, renewal)?
- Any special conditions (online-only billing, usage thresholds, credit check)?
A quick rule of thumb
If you’re comparing two flexible tariffs, estimate your annual cost with:
Estimated annual cost = (unit rate × annual kWh) + (standing charge × 365)
This ignores any one-off credits and assumes rates don’t change. Trackers and SVTs can change, so treat it as a snapshot for decision-making.
Costs, exclusions and common pitfalls
Flexible doesn’t always mean cheaper. These are the main reasons people think they’ve found the cheapest no lock-in tariff — then get surprised later.
1) Standing charge dominates
If you use less energy (or are out a lot), a higher standing charge can make an apparently “cheap” unit rate cost more overall.
2) Payment method pricing
Many tariffs assume monthly Direct Debit. Pay-on-receipt or prepay can have different pricing and fewer options.
3) Meter limitations
Economy 7 and smart-only time-of-use deals require the right meter setup. Some suppliers may need to exchange your meter first.
4) Intro discounts ending
A tariff can look cheapest because of a short-term credit or promotional discount. Always check the ongoing rates and when they apply.
5) “No lock-in” but prices can change
Trackers can move frequently, and SVTs can change with notice. Flexibility helps you leave, but you may need to monitor your tariff.
6) Switching timing and final bills
Even with £0 exit fees, you may get a final bill/credit based on meter readings. Give accurate readings to avoid surprises.
If you’re in debt to your current supplier: you may still be able to switch, but there can be restrictions (especially for prepay). If you’re unsure, include it in your enquiry so we can explain your options.
FAQs: cheapest no lock-in energy tariffs (UK)
Is a no lock-in tariff the same as no exit fees?
Usually, yes: “no lock-in” typically means you can leave without paying an exit fee. Still check the tariff information, because terms can differ by supplier and product.
Can a fixed tariff be “no lock-in”?
Sometimes. A supplier may offer a fixed-rate deal with £0 exit fees. It’s still “fixed” for a term, but you can choose to leave early without that specific penalty.
Are no lock-in tariffs always the cheapest?
Not always. Some of the lowest-priced deals can have exit fees, while some flexible tariffs may be priced higher for the added freedom. Comparing based on your estimated annual cost is the safest approach.
Do rates change by postcode in the UK?
Yes. Electricity standing charges and unit rates vary by region, and gas pricing can vary too. That’s why you can’t rely on a national “cheapest tariff” list without checking your postcode.
Can I get a no lock-in tariff on a prepayment meter?
Possibly, but choice can be more limited than for credit meters. Some suppliers offer prepay tariffs with flexible terms. If you can move to a credit meter, that may open up more options (subject to checks and eligibility).
What’s the risk with tracker tariffs?
Prices can rise (sometimes quickly), depending on how the tracker is set. Always check how often it updates, whether there’s a cap/ceiling, and what notice you’ll get for changes. A £0 exit fee makes it easier to leave if it stops being competitive.
Will switching interrupt my gas or electricity supply?
Switching supplier should not interrupt your supply. Your energy still comes through the same pipes and wires. You may need to provide meter readings for accurate final and opening bills.
Is dual fuel always cheaper for no lock-in deals?
Not necessarily. Some suppliers price dual fuel competitively, but the best value can still come from separate gas and electricity suppliers depending on your region and usage. Compare both ways if you’re aiming for the lowest total cost.
Trust, methodology and sources
Editorial information
How we assess “cheapest no lock-in”
Because tariffs vary by region and customer profile, we don’t name a single universal cheapest tariff on this page. Instead, we guide you to identify the cheapest available to you using measurable inputs.
- No lock-in criteria: we treat this as £0 exit fees (or clearly stated “no exit fee”) and/or no fixed-term tie-in. Where suppliers use different wording, we recommend checking the tariff information label.
- Cheapest criteria: lowest estimated annual cost based on unit rates, standing charges, and your usage profile (or typical assumptions if unknown).
- Availability filters: region, payment method (Direct Debit/on receipt/prepay), meter type (smart/credit/prepay/Economy 7), and supplier eligibility (which can include credit checks).
Limitations: prices can change, especially on SVT/tracker/time-of-use tariffs. One-off credits, warm home discounts, and personalised payment plans can also affect what you actually pay.
Ready to find a flexible tariff that’s actually cheap for your home?
Get whole-of-market comparison results based on your postcode, meter type and how you pay. We’ll flag options with £0 exit fees where available.
You won’t be switched without your confirmation. Tariff availability and rates vary by region and customer circumstances.
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