Cheapest gas and electricity deal for a flat (UK)
Find an estimated low-cost tariff for your flat based on your meter type, payment method and postcode. We’ll explain what “cheapest” really means for flats, and help you compare confidently.
- Whole-of-market comparison for UK homes (not business)
- Flat-specific factors covered: Economy 7, prepay, standing charges, and usage levels
- Clear methodology, examples with numbers, and switching pitfalls to avoid
Estimates vary by region, meter type, payment method and usage. Always check tariff terms, unit rates, standing charges and any exit fees before switching.
Fast answer: what’s the cheapest energy deal for a flat?
There isn’t one single “cheapest” gas and electricity deal for all UK flats. The cheapest deal for your flat is the tariff with the lowest estimated annual cost for your postcode and setup — mainly driven by:
Your meter type
Single-rate, Economy 7 (two-rate), smart meter, or prepayment. This can change which tariffs you can access.
Standing charges
Flats often use less energy, so a lower standing charge can matter as much as the unit rate.
Your region & payment method
Prices vary by region and whether you pay by Direct Debit, receipt of bill, or prepayment.
Rule of thumb for flats: If you’re a low-to-medium user, the “cheapest” deal is often a tariff that balances reasonable unit rates with lower standing charges — not necessarily the lowest unit rate advertised.
- If you have electric heating (common in flats), check whether you’re on Economy 7 or would be better on a single-rate tariff.
- If you have a prepayment meter, you may see fewer tariffs, but it can still be worth comparing (and checking if you can move to credit).
- If your flat is all-electric, you’ll be comparing electricity-only tariffs, not dual fuel (gas + electricity).
Compare deals for your flat (postcode-based)
Complete the form to see tariffs that fit your property. We’ll use your postcode to match regional price caps, network costs and availability. If you know your meter details (e.g. Economy 7 or prepayment), that helps you avoid unsuitable results.
Tip: If you rent a flat, you can usually switch supplier if you pay the energy bills and have your own meter. If bills are included in rent, or there’s a communal heating system, switching may not be possible.
What you’ll need (2 minutes)
- Your postcode (to price tariffs correctly)
- An email and phone number (so we can share results and help if you want to switch)
- Optional but useful: current supplier, whether you have Economy 7 or prepay, and your rough usage
Get your quote
Compare what “cheapest” can mean for a flat
When you’re in a flat, your annual usage can be lower than a typical house — which makes standing charges and meter suitability especially important. Use this table to decide what to prioritise.
| Flat situation | What to prioritise | Why it matters | Watch-outs |
|---|---|---|---|
| Low energy use (small 1-bed, out at work) | Lower standing charges, then unit rates | Standing charges are paid daily even if you use little energy | A low unit rate can look great but still cost more overall if standing charges are high |
| All-electric flat (no gas) | Electricity unit rate + whether you need two-rate | Heating and hot water can be your biggest costs | Economy 7 can be expensive if you don’t use power overnight |
| Economy 7 with storage heaters | Strong night rate + sensible day rate | Your costs depend on how much you can shift to off-peak hours | Check the off-peak hours (they vary) and whether your meter is correctly configured |
| Prepayment meter | Paye-as-you-go tariffs available + support options | Not all suppliers/tariffs are available for prepay | Debt on the meter and top-up method can affect switching |
| Dual fuel (gas + electricity) | Total annual cost across both fuels | Dual-fuel “discounts” are not always cheaper overall | Compare separate tariffs too; check exit fees and fixed-term end dates |
Decision checklist (who it suits / who it doesn’t)
This approach suits you if…
- You want a clear estimated annual cost tailored to your postcode
- You can choose a Direct Debit payment method
- You know (or can check) whether you have single-rate, Economy 7 or prepay
- You’re happy to trade a “headline” unit rate for a better overall cost
It may not suit you if…
- Your flat has heat network / communal heating (you may not have an individual supplier choice)
- Your energy is included in rent/service charge (you may not be the bill payer)
- You have multiple meters or a complex setup (you’ll need a more tailored check)
- You’re in debt on a prepayment meter (switching can be possible, but needs extra steps)
Costs, exclusions and common pitfalls (especially for flats)
1) Standing charges can dominate
If your flat uses less energy, daily standing charges can make up a larger share of your bill. The cheapest tariff for a low user can be the one with a lower standing charge even if the unit rate is a bit higher.
2) Economy 7 only works if you use off-peak
Two-rate tariffs can be great for storage heaters and overnight hot water. But if most of your use is daytime, Economy 7 can cost more than a single-rate tariff.
3) Payment method affects prices
Direct Debit tariffs are often priced differently to pay-on-receipt-of-bill or prepayment. When comparing, make sure you’re comparing like-for-like on payment method.
4) Exit fees and fix length
Some fixed tariffs include exit fees if you leave early. If you might move flat soon, a flexible tariff or a short fix may reduce risk.
5) “All-electric” means no gas comparison
Many flats do not have a gas supply. In that case, the “cheapest” deal is an electricity tariff only — and your heating type (panel heaters, storage heaters, heat pump) becomes the key driver.
6) Communal systems & sub-metering
Some blocks use communal heating or landlord-managed supplies. You might still control your electricity, but not gas/heat. Check your tenancy agreement or managing agent if unsure.
Two realistic scenarios (with numbers)
These examples show how “cheapest” can change for flats. They are illustrative and not a promise of pricing. Actual rates vary by region, supplier, meter setup and time.
Scenario A: 1-bed flat, low usage (dual fuel)
- Assumptions
- Electricity 1,800 kWh/yr, gas 7,500 kWh/yr; Direct Debit; single-rate electricity.
- Tariff 1 (lower unit rates, higher standing charges)
- Standing charges: £0.60/day elec + £0.35/day gas. Unit rates: 24p/kWh elec, 6p/kWh gas. Estimated annual cost: standing £346.75 + usage £882 = £1,228.75.
- Tariff 2 (slightly higher unit rates, lower standing charges)
- Standing charges: £0.40/day elec + £0.25/day gas. Unit rates: 25p/kWh elec, 6.2p/kWh gas. Estimated annual cost: standing £237.25 + usage £915 = £1,152.25.
What this shows: for lower-usage flats, standing charges can outweigh small differences in unit rates.
Scenario B: all-electric flat with Economy 7
- Assumptions
- Total electricity 3,600 kWh/yr; standing charge £0.55/day; comparing single-rate vs Economy 7. (Off-peak share can vary widely.)
- Economy 7 tariff
- Day 30p/kWh, night 12p/kWh. If you use 40% at night: usage cost = (2,160×30p) + (1,440×12p) = £820.80. Standing = £200.75. Total ≈ £1,021.55.
- Single-rate tariff
- 24p/kWh. Usage = 3,600×24p = £864.00. Standing = £200.75. Total ≈ £1,064.75.
What this shows: Economy 7 can be cheaper if you can shift enough use to off-peak. If your night usage is low, the higher day rate can wipe out the benefit.
FAQs: cheapest energy deals for flats
Are dual fuel deals always cheaper for a flat?
Not always. Some suppliers price dual fuel competitively, but a “dual fuel discount” doesn’t guarantee the lowest total cost. Compare the combined estimated annual cost and also check whether separate suppliers would be cheaper for gas and electricity.
Can I switch energy supplier in a rented flat?
Usually yes if you are the bill payer and you have your own meter. You don’t normally need the landlord’s permission to switch supplier, but you should leave the property with an active supply and settle any final bills. If bills are included in rent or there’s communal heating, you may not be able to choose your supplier.
What if my flat has only electricity and no gas?
That’s common. In that case, you’re comparing electricity-only tariffs. The “cheapest” choice depends heavily on your heating/hot water setup (panel heaters vs storage heaters vs heat pump) and whether a two-rate tariff such as Economy 7 makes sense.
How do I know if I’m on Economy 7 in my flat?
Check your bill for two electricity unit rates (often labelled “day” and “night”), or look at your meter display for two registers (e.g. R1/R2). Storage heaters and immersion heaters are common clues, but not definitive. If you’re unsure, compare both Economy 7 and single-rate options before switching.
Can I get the cheapest tariffs with a prepayment meter?
You can still compare, but your choice may be more limited and pricing may differ. If you’re on prepay, it can be worth checking whether you’re eligible to move to a credit meter or smart pay-as-you-go (rules vary by supplier and circumstances). If there’s debt on the meter, switching may be restricted until it’s repaid or transferred under agreed rules.
Do smart meters make energy cheaper in flats?
A smart meter doesn’t automatically make your tariff cheaper. It can make readings more accurate and may open up certain tariff types, depending on the supplier. The key is still the tariff’s unit rates, standing charges, and whether the tariff fits your usage pattern.
What are the biggest mistakes when choosing a “cheap” deal for a flat?
The most common issues are: choosing based on unit rate alone (ignoring standing charges), picking Economy 7 without enough off-peak use, forgetting exit fees on fixed tariffs, and comparing tariffs using the wrong payment method or meter type.
How long does switching take in the UK?
Switching times can vary by supplier and circumstances. Once the switch is agreed, suppliers typically complete it within a few working days, but issues like meter setup, address matching, or debt can slow things down. You should still have a continuous supply throughout.
How we assess the cheapest deal (methodology you can check)
Our “cheapest” definition
We treat “cheapest” as the tariff with the lowest estimated annual cost for a given home profile, based on:
- Electricity and/or gas unit rates (p/kWh)
- Standing charges (p/day)
- Your region (postcode-based)
- Meter type (single-rate, two-rate/Economy 7, smart, prepay)
- Payment method (e.g. Direct Debit vs prepay)
Important limitations (so you’re not misled)
- Estimates change when suppliers update prices and when Ofgem updates the price cap.
- Two flats in different regions can see different standing charges and unit rates for the same named tariff.
- If your flat is on a heat network or has landlord-managed supply, “switching supplier” may not apply.
- Individual eligibility rules can apply (e.g. certain tariffs requiring a smart meter or specific payment method).
- We recommend confirming rates and fees on the supplier’s tariff information before proceeding.
Editorial trust signals
- Written by
- EnergyPlus Editorial Team
- Reviewed by
- Energy Specialist
- Last updated
- May 2026
Sources (UK)
- Ofgem (Office of Gas and Electricity Markets) – price cap information and consumer protections
- Citizens Advice: energy supply and switching – practical guidance for tenants and billing issues
- GOV.UK – general UK consumer and household guidance
Ready to find the cheapest deal for your flat?
Get a postcode-based comparison that accounts for meter type, payment method and flat-friendly costs like standing charges. No misleading promises — just clear options.
If you’re unsure about your meter type (Economy 7, prepay, smart), submit your details and we’ll help you interpret what you have before you commit to a switch.
Back to Local Home Energy