Average UK Energy Bills by Household Size in 2026
The short answer
- £1,496 a year for a home with one adult and £2,289 with four adults, at the price cap from 1 October 2026
- £1,888 for two adults, the group a family with two children falls into in the government data
- About £190 to £390 a year for each extra adult, mostly hot water and electricity, because heating is fixed by the home
A home with one adult pays around £1,496 per year for gas and electricity at the price cap from 1 October 2026, and a home with four adults around £2,289. Those are the median metered bills for 2024 in government data covering England and Wales. The difference comes down to hot water, appliance use and the size of the home, because bigger households tend to live in bigger homes. This guide breaks down average energy bills by number of occupants, property type, and fuel, so you can see exactly where you sit and where the savings opportunities are.
What does each household size pay?
£1,496 a year for one adult, £1,888 for two and £2,289 for four. The cost per adult falls as the household grows, because heating is largely fixed by the size of the home.
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| Adults in the home | Gas | Electricity | Total | Per adult, to the nearest £10 |
|---|---|---|---|---|
| 1 adult | £784 | £712 | £1,496 | £1,500 |
| 2 adults | £949 | £939 | £1,888 | £940 |
| 3 adults | £1,025 | £1,054 | £2,079 | £690 |
| 4 adults | £1,118 | £1,171 | £2,289 | £570 |
| 5 or more adults | £1,256 | £1,271 | £2,527 | £510 or less |
The data behind this table
Median metered consumption in 2024 by number of adults in the home, from the DESNZ NEED consumption tables 2026 (tables 13c and 14c, England and Wales): 8,482, 10,545, 11,499, 12,664 and 14,397 kWh of gas and 1,945, 2,809, 3,244, 3,690 and 4,069 kWh of electricity. Priced at the Ofgem cap for October to December 2026: gas 7.97p/kWh plus 29.68p/day, electricity 26.32p/kWh plus 54.83p/day. NEED counts adults only, from Experian household data, so children are not counted, and its gas figures cover homes with a gas meter.
Notice that the cost per adult drops as the household grows. One adult living alone pays about £1,496 a year. In a four adult home the cost per adult is about £570, because heating costs are largely fixed by the size of the property, not the number of people in it. A family of two adults and two children counts as a two adult home in this data, with a median bill of £1,888. Electricity for appliances and lighting scales more directly with the number of people.
How much does property type matter?
More than household size: from £1,126 a year for a well-insulated 1-bed flat to £2,835 for a 5-bed detached house. The same homes at band E pay roughly 24 to 28% more for gas.
| Property type | Gas heating | Electricity | Total |
|---|---|---|---|
| 1-bed flat | £488 | £639 | £1,126 |
| 2-bed terrace | £583 | £763 | £1,345 |
| 3-bed semi | £854 | £900 | £1,754 |
| 3-bed detached | £901 | £900 | £1,801 |
| 4-bed detached | £1,097 | £1,087 | £2,185 |
| 5-bed detached | £1,429 | £1,406 | £2,835 |
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Property type has a bigger impact on energy bills than household size. A 4-person family in a well-insulated 3-bed semi pays less than a couple in a draughty detached house.
The data behind this table
Assumes gas central heating with a condensing boiler at 90% efficiency. Ofgem price cap, October to December 2026. Gas figures come from our heat demand model fitted to DESNZ NEED data, include the 29.68p daily standing charge and cover well-insulated properties at about EPC band C. The same homes at band E pay roughly 24 to 28% more for gas. Electricity is the 2024 median for homes with that many bedrooms, from the DESNZ NEED consumption tables (Table 4c), the same figures as our energy bill calculator and average energy bills guide.
The Ofgem price cap "typical" household figure of £1,723 per year is based on a medium-consumption home using 2,500 kWh of electricity and 9,500 kWh of gas. Your actual bill depends on property size, insulation, heating system, and how many people live there. Use our insulation savings calculator to see how much you could save.
What drives the differences?
Heating, which depends on the home's heat loss rather than how many people live there. Hot water and electricity for appliances and lighting are what rise with each extra person.
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Heating
Heating is the largest component and is determined primarily by your property's heat loss, not the number of people living there. A 4-bed detached house costs much the same to heat whether 2 or 5 people live in it. The main factors are insulation level, property size, and heating system efficiency.
The measured savings from insulation are smaller than the modelled figures often quoted. Homes that had cavity wall insulation fitted used a median 12.0% less gas afterwards, about £105 a year for a 3-bed semi, and homes that had loft insulation fitted or topped up 3.2% less, about £28 (DESNZ NEED, 2026). Many homes were cold before and took some of the gain as warmth. Draught-proofing is the cheapest job to do yourself. If you qualify, ECO4 covers insulation for free until 31 December 2026.
Hot water
Hot water use rises with the number of people, through showers, baths and washing, and it is one of the main reasons gas use climbs with household size in the table above.
Reducing hot water costs: insulate your hot water cylinder if it has no factory foam, take shorter showers, and consider a low-flow showerhead.
Electricity for appliances and lighting
More people means more cooking, more laundry, more devices charging, and more lights on. But the base load (fridge, freezer, broadband router, standby power) is the same regardless of occupants.
Switching to LED lighting, using appliances on economy cycles and avoiding standby power all trim the electricity bill.
How can you cut your bill?
For a 3-bed semi on gas, cavity wall insulation saves about £105 a year and loft insulation about £28. With a heat pump, a heat pump tariff saves about £271, and DIY draught-proofing costs under £250.
| Upgrade | Cost | Saving a year | Payback |
|---|---|---|---|
| Switch to a heat pump tariff (if you have a heat pump) | Free | About £271 | Immediate |
| Cavity wall insulation | About £2,200 | About £105 | About 21 years at full price, often free with a grant |
| Loft insulation | About £750 bare, £600 top-up | About £28 | Over 20 years at full price, often free with a grant |
| Draught-proofing (DIY) | Under £250, the Energy Saving Trust price for a fitted job | Not measured separately | Cheap, and warmer rooms straight away |
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What the main options are worth for a 3-bed semi on gas, using measured savings where they exist:
The data behind this table
Insulation savings are the median fall in gas use measured in homes that had each measure fitted between May 2023 and May 2024 (DESNZ NEED 2026, table 1), applied to a 3-bed semi using 11,000 kWh of gas at 7.97p. Measured savings are what homes like yours typically saw, not the most you could save. Insulation costs from the Energy Saving Trust (2026). The tariff saving is our model's heat pump running cost for the same home at 26.32p against 18.7p per kWh, a heat pump tariff such as Cosy Octopus with most heating in the cheap hours.
For a typical 3-bed semi, getting from average insulation to the well-insulated level in the property table above takes the bill from about £1,885 a year to about £1,754. Use our EPC improvement planner to see the full impact and prioritise by cost-effectiveness. Use our grant eligibility checker for free funding.
Switching heating system
If you are on gas, switching to a heat pump on a heat pump tariff saves about £211 a year on heating for a 3-bed semi, before standing charges. From oil the saving is about £650 a year at 11.3p per kWh, the BoilerJuice UK average of 116.20p a litre on 25 September 2026, though oil prices move. From LPG the saving is about £440 and from direct electric heating about £1,940. See our heat pump vs boiler comparison and electric boiler vs heat pump guide.
Frequently asked questions
What is the average energy bill for a 4-person household?
A home with four adults pays a median of about £2,289 a year for gas and electricity at the Ofgem price cap for October to December 2026. The government data counts adults only, so a family of two adults and two children falls in the two adult group, with a median of about £1,888. See our average energy bills guide for national averages.
What is the average energy bill for a 1-person household?
About £1,496 a year, the median for homes with one adult in 2024 at October 2026 prices. Single-adult homes use less gas and electricity, but the standing charges and the heating of the home do not shrink with the household. Draught-proofing and loft insulation cut costs fastest.
How much do energy bills increase per person?
On the median figures each extra adult adds about £190 to £390 a year: £392 from one adult to two, then £190, £210 and £238. Most of it is hot water and electricity, because heating costs are largely fixed by property size.
Data sources
Consumption by number of adults comes from the DESNZ NEED consumption tables 2026, and prices from the Ofgem price cap. Measured insulation savings also come from DESNZ NEED, and insulation costs from the Energy Saving Trust.
Show every source
Energy prices from the Ofgem price cap, October to December 2026. Consumption by number of adults from the DESNZ NEED consumption tables 2026. Measured insulation savings from the DESNZ NEED impact of measures tables 2026. Insulation costs from the Energy Saving Trust. Gas by property type from our heat demand model. Heating oil from BoilerJuice on 25 September 2026, converted at 10.294 kWh a litre from the DESNZ greenhouse gas conversion factors 2026.