Cheapest fixed energy tariff for a flat in the UK (how to find it)
Fixed deals can protect you from price changes—but the “cheapest” tariff for a flat depends on your flat’s usage, meter type, region and payment method. This guide shows how to identify the lowest total annual cost and when a fix may not be best.
- See what actually makes a fixed tariff cheapest for flats (unit rate + standing charge)
- Compare typical flat scenarios with realistic numbers and clear assumptions
- Get a whole-of-market quote in minutes (no obligation)
Estimates only. Prices vary by supplier, region, meter type (single-rate/Economy 7/smart), and payment method. Always check tariff terms, exit fees and eligibility.
Fast answer: the cheapest fixed tariff for a flat is the one with the lowest estimated annual cost for your exact setup
For most UK flats, a “cheap” fixed deal isn’t just about a low unit rate. Flats often use less energy than houses, so the standing charge can matter as much as (or more than) the unit rate. The cheapest fixed tariff for you is the tariff that minimises your total annual cost based on:
1) Your meter & heating
Single-rate vs Economy 7, smart meter, electric storage heaters, immersion, or gas boiler.
2) Your region & payment
Standing charges and unit rates vary by region (DNO area) and payment method (direct debit, prepay).
3) Your usage level
Low-usage flats often benefit from lower standing charges; higher-usage flats benefit more from lower unit rates.
Quick rule of thumb: If your flat uses relatively little energy, don’t chase the lowest unit rate without checking the standing charge and any fixed term/exit fees. For all-electric flats (especially with Economy 7), getting the meter/tariff match right usually matters most.
Key takeaways for flat owners & tenants
- Compare on total annual cost, not just “£/kWh”.
- Check exit fees on fixed deals (can apply if you leave early).
- Economy 7 can be cheaper or more expensive depending on when you use electricity.
- Prepayment (PAYG) often has fewer fixed options—quotes must match your meter type.
- Standing charges can be a big portion of bills for small flats.
What you’ll need to get an accurate result
- Your postcode (for regional pricing).
- Whether you have gas + electricity or electric-only.
- Your meter type (single-rate, Economy 7, smart, prepay).
- Approximate annual kWh (or a recent bill/statement).
Compare fixed tariffs for your flat (whole-of-market)
We’ll match your quote to your flat’s location and meter type, then show fixed deals ranked by estimated annual cost (including standing charges). If you’re not sure about your meter, you can still start—add detail later.
Good to know: If you rent, you can usually switch supplier if you pay the bills—check your tenancy agreement. If bills are included, you typically can’t switch the supplier yourself.
Two realistic flat scenarios (with numbers)
Scenario A: Small 1-bed flat (gas + electric)
- Assumptions
- Direct debit, single-rate electricity, typical occupancy (1–2 people). Annual use: 1,800 kWh electricity + 7,000 kWh gas. Region and exact rates will vary.
- How the “cheapest fix” often wins
- At lower usage, a tariff with a slightly higher unit rate but lower standing charges can be cheaper overall. A 5p/day standing charge difference is ~£18/year (5p × 365), which can outweigh small unit-rate changes for low-consumption flats.
Scenario B: All-electric flat with Economy 7
- Assumptions
- Direct debit, Economy 7, storage heaters/immersion. Annual use: 4,200 kWh total, with 45% off-peak (night rate). Standing charges vary by region.
- What changes the outcome
- If your off-peak share falls (for example to 20%), an Economy 7 fixed tariff can become less competitive than a single-rate fix. For all-electric flats, the cheapest tariff is often the one that matches when you use electricity—not just how much.
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Tell us a few details so we can show fixed deals that fit your flat. We’ll use your postcode to match regional rates.
How to spot the cheapest fixed tariff for your flat (UK checklist)
Use this process to avoid the most common flat-specific comparison mistakes (especially around standing charges and Economy 7).
- Confirm your meter type: single-rate, Economy 7 (two rates), smart, or prepayment. If you’re not sure, check your bill, in-home display, or meter display.
- Estimate your annual usage in kWh: your annual statement is best. If you only have monthly bills, you can roughly scale up, but note seasonality (winter is higher).
- Compare total cost, not just rates: add standing charge and unit costs across a year. For low-use flats, standing charges can be a big share of the bill.
- Check fixed-term details: length (e.g., 12 months), exit fees, and what happens at the end (often moves to a variable tariff if you do nothing).
- Match the tariff to your heating pattern: Economy 7 only helps if you can shift enough use off-peak (storage heaters, timed immersion, overnight appliances).
- Consider your moving plans: if you may move soon, a long fix with exit fees may be poor value even if it looks “cheapest”.
Tenant note: If you’re on a supplier chosen by your landlord but you pay the energy bills, you can usually switch supplier. If energy is included in rent/service charge, you normally can’t switch (because you’re not the bill payer).
Fixed tariff comparison: what matters most for flats
Below is a practical comparison of the most common fixed options UK flat households consider. The “best” choice depends on your usage, meter type, and how long you plan to stay.
| Option | Who it suits | Watch-outs | What to check |
|---|---|---|---|
| 12-month fixed (single-rate) | Most gas + electric flats; electric-only without off-peak needs. | Exit fees; may not be cheapest if standing charge is high for your region. | Standing charge, unit rate, exit fee amount, end-of-fix process. |
| Longer fixed (18–24 months) | People wanting longer price certainty and staying put. | Greater risk if prices fall; moving could trigger exit fees. | Exit fees per fuel, contract length, whether fees are waived if you move. |
| Economy 7 fixed (day/night rates) | All-electric flats with storage heaters or controllable off-peak use. | Can cost more if most usage is daytime; comparing is harder. | Your off-peak %, day rate, night rate, standing charge, peak-time habits. |
| No-exit-fee fix (if available) | Renters or movers who want flexibility. | Rates may be higher than a standard fix. | Whether fees truly £0, any conditions, price vs standard fix. |
| Prepayment fixed (PAYG) | Households on prepay meters seeking price certainty. | Fewer deals; eligibility varies; top-up method differences. | Meter compatibility, debt recovery settings, fees, how rates are applied. |
Decision checklist: a fixed tariff is likely to suit you if…
- You value stable prices for budgeting.
- You expect to stay in the flat for most of the fixed term.
- Your current tariff is variable and you want protection from potential rises.
- You’ve checked the standing charge and it’s competitive for your usage.
A fixed tariff may not suit you if…
- You might move soon and the tariff has exit fees.
- You’re on Economy 7 but can’t reliably use off-peak electricity.
- You’re in a very low-usage flat and the standing charge dominates your bill.
- You need maximum flexibility (for example, you’re sorting out a meter change).
Costs, exclusions and common pitfalls (especially for flats)
These are the main reasons people think they’ve found the cheapest fixed tariff—then end up disappointed. Quick checks now can save hassle later.
Standing charges can dominate
If your flat uses relatively little energy, the standing charge can be a large share of your bill. Always compare the combined annual cost.
Meter mismatch (single-rate vs E7)
An Economy 7 meter on a single-rate tariff (or vice versa) can lead to poor value. Check your meter and your off-peak usage pattern.
Exit fees and moving home
Fixed deals may charge exit fees if you leave early. Some suppliers waive fees when you move, others don’t—check the terms.
Direct debit vs prepay differences
Many of the lowest priced fixed deals assume monthly direct debit. If you’re prepay, ensure the quote is specifically for your meter type.
Introductory discounts aren’t the whole story
Some deals include incentives. Focus on the ongoing rates and the full estimated annual cost rather than headline promotions.
Service charge & communal heating
If your block uses communal or district heating, your energy setup may be different. You might only control electricity, not heat supply.
Important: Any “cheapest tariff” claim that doesn’t ask for your postcode, meter type and usage is not reliable. Regional charges can materially change both standing charges and unit rates across the UK.
Mini-calculation: why flats should look at standing charges
If two fixed tariffs have the same unit rate, but one has a standing charge that’s 12p/day higher, that’s roughly £43.80/year extra (0.12 × 365), even before you use a single kWh. For low-usage flats, this can outweigh small unit-rate differences.
FAQs: cheapest fixed tariffs for flats
Is a fixed tariff always cheaper for a flat?
No. A fixed tariff can be cheaper or more expensive than a variable tariff. It mainly offers price certainty. The cheapest option depends on your flat’s usage, meter type, and the standing charge in your region.
What usage counts as “low usage” for a flat?
There’s no single threshold, but many 1–2 person flats have relatively low electricity use compared with houses. If your annual electricity is around the low thousands of kWh (or below), standing charges become more important in comparisons.
I’m a tenant—can I switch to a fixed tariff?
Usually yes if your name is on the bill and you pay the supplier directly. If your tenancy includes bills (or the building has a communal heat contract), you may not be able to change the supplier yourself.
Should I choose dual fuel for a flat?
If your flat has both gas and electricity meters, dual fuel can be convenient, but it’s not automatically cheaper. The cheapest outcome can be dual fuel with one supplier or separate suppliers per fuel—compare both ways.
Do smart meters affect which fixed tariffs I can get?
Some tariffs are only available to smart meter customers, but most fixed deals don’t require one. If you have a smart meter, ensure the tariff is compatible with your current meter configuration (single-rate or Economy 7).
What’s the catch with exit fees on fixed tariffs?
Exit fees are charges for leaving a fixed contract early. They vary by supplier and can apply per fuel. If you may move or switch again soon, consider a no-exit-fee tariff (if available) or a shorter fix.
How do I know if Economy 7 is worth it in my flat?
It depends on your off-peak share. Economy 7 tends to work best when a meaningful chunk of usage happens overnight (for example, storage heaters and timed hot water). If most of your use is daytime, a single-rate fixed tariff may be cheaper.
Can I switch if I’m in an apartment block with communal heating?
Often you can switch your electricity supplier, but you may not control the heat supply if it’s communal/district. Check your lease/service charge details and what’s individually metered.
Trust, methodology and sources
Editorial accountability
- Written by:
- EnergyPlus Editorial Team
- Reviewed by:
- Energy Specialist
- Last updated:
- May 2026
How we assess “cheapest fixed tariff for a flat”
We focus on what makes a tariff cheapest in the real world for flat households: estimated annual cost (unit rates + standing charges) under a stated usage assumption, and whether the tariff is appropriate for the meter type (single-rate vs Economy 7, prepay compatibility).
- Inputs that materially change results: postcode/region (DNO area), payment method, meter type, and consumption (kWh).
- What we compare: fixed tariffs available to UK households, including dual fuel and electricity-only options, and where relevant, Economy 7 fixed options.
- How we rank: by estimated annual cost for the user’s stated details (or the scenario assumptions where shown).
- Limitations: tariffs and eligibility can change; some deals may be limited to new customers; supplier availability varies by region; estimates may differ from your actual bills due to weather, occupancy, and behavioural changes.
No guarantees: We can’t promise a specific supplier will be cheapest for every flat. The only accurate answer is a personalised comparison using your meter type, region and usage.
Sources (UK)
- Ofgem (UK energy regulator) – regulation, switching protections, and market information.
- Citizens Advice – energy supply advice – practical guidance on billing, switching and consumer rights.
- GOV.UK – energy information – government guidance on energy and support schemes.
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EnergyPlus provides comparisons for UK homes. Tariff availability and prices vary; always confirm rates, fees and contract terms before switching.
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