Why Is My Home Using So Much Energy?

Your home may use more energy than you expect because of heat loss, the heating and hot-water systems, appliances, weather or changes in how the household uses the property. Several factors can contribute at the same time.

But a higher bill does not necessarily mean you have used more energy. Changes to prices, estimated readings or billing adjustments can also affect what you pay.

Start by checking whether your gas or electricity consumption has increased, then look at what changed in the home during that period.

Your home and your energy bill are not the same thing

It helps to separate energy use from energy cost.

Energy use is the amount of gas or electricity your household consumes, usually measured in kilowatt-hours (kWh). Energy cost is what you pay for that energy, which is also affected by your tariff, unit rates and standing charges. Ofgem explains how your electricity or gas bill is calculated.

This means your bill can increase even if the amount of energy you use stays similar. Equally, two households paying similar energy prices can have very different bills because one home uses more energy than the other.

Why can similar homes use different amounts of energy?

A home's energy use is the result of several factors working together. Even neighbouring properties built at the same time can behave differently if their insulation, heating systems, condition or household use are different.

The size and layout of your home

Larger homes generally have more space to heat, but floor area is not the only factor.

Ceiling height, the number of external walls, extensions, conservatories and the way rooms are arranged can all affect how heat moves through a property and how much energy is needed to keep it comfortable.

Insulation and heat loss

Insulation helps slow down the movement of heat out of a home.

The level of insulation in the roof, walls and floors can therefore affect how much heating a property needs. Windows, doors and draughts can also influence heat loss.

Two similar-looking homes may have had very different improvements carried out over the years, so their energy performance may no longer be the same.

If the issue is concentrated in one room, read why one room may be colder than the others for observations that can help explain the pattern.

Suitable ventilation matters alongside measures that reduce heat loss. Our guide to how home ventilation works explains why intended airflow should be considered when windows or insulation change.

Your heating system

The type, age, condition and controls of a heating system can affect how efficiently a home is heated.

A property might use a gas boiler, electric heating, heat pump or another system. Heating controls, thermostats and the way different rooms are heated also affect consumption.

If a heating system is not working as expected, that can make it harder to understand changes in energy use. Keeping a record of what has changed can be useful when investigating the cause.

How you heat your home

The property itself is only part of the picture.

The temperature you choose, how many hours the heating is on and which rooms you heat can all affect consumption. Two households living in identical properties could therefore use very different amounts of energy.

This does not automatically mean one household is using energy incorrectly. Different households have different needs.

The number of people living in the home

Occupancy can make a significant difference to actual energy consumption.

More people may mean more hot water, cooking, washing, appliance use and time spent at home. Working from home, school routines and other changes in how a property is occupied can also alter its energy use.

Hot water

Heating rooms is only one use of energy in a home. Energy is also needed for hot water.

The amount used for showers, baths, washing and other everyday activities varies considerably between households. The way hot water is produced and stored can matter too.

Appliances and electrical equipment

The number and type of appliances in a home can affect electricity consumption.

Large appliances, cooking equipment, computers, televisions and other electrical devices all contribute to actual household use. Older or inefficient appliances may also use more electricity than newer alternatives. Energy Saving Trust explains which household appliances use the most electricity.

This is one reason your real energy use should not be treated as exactly the same thing as an EPC estimate.

Weather and location

Energy use can change from year to year simply because the weather changes.

A colder winter may require more heating. The position of a property, exposure to wind and other local factors can also influence how quickly a home loses or gains heat.

When comparing bills, it is therefore useful to compare similar periods rather than assuming every month or year should look the same.

What can your EPC tell you about energy use?

An EPC provides useful information about the energy efficiency of a property, including its rating and information about features such as heating and insulation.

However, an EPC uses standardised assumptions so properties can be compared consistently. It is not a prediction of exactly what your household will pay for energy.

Your actual consumption reflects what happens in the home in practice, including occupancy, heating patterns, weather and electrical appliance use.

Our guide to what your EPC can tell you about your home explains the information in more detail.

How can you check why your energy use has increased?

Start with your bills and meter readings before assuming that something is wrong with the property.

Compare consumption in kWh. Look at gas and electricity separately, rather than comparing only the total amount charged.
Check the dates covered. A longer billing period can show more consumption simply because it includes more days. Compare similar periods and consider differences in the weather.
Check whether readings are actual or estimated. A bill based on a new actual reading may adjust earlier estimates, rather than show a sudden increase in recent use.
Note changes in the household. More time at home, additional occupants, different heating hours or greater hot-water use can affect consumption.
Look at changes in equipment or the property. Have you started using an electric heater, added an appliance, changed heating controls or noticed a fault?

Your EPC can add context about the home's recorded heating and insulation, but it cannot explain every change in actual consumption.

Keep the bills, readings and relevant dates together. This gives your supplier or landlord a clearer starting point if you need help investigating.

What if your energy bill has suddenly increased?

Check what has increased: the energy used, the charges on your bill or your monthly payment. These are related, but they are not the same thing.

Look for changes to unit rates, standing charges, the billing period or adjustments to earlier estimated readings. If you pay by Direct Debit, ask your supplier to explain a payment increase rather than assuming it means you have used more energy that month.

If the figures still look unusual, contact your supplier with the relevant bill and meter readings. If you rent and have noticed a heating fault or another possible repair issue, report that through your landlord's usual channel too.

Our Energy Costs guide explains what information to keep when costs rise unexpectedly.

What if energy costs are becoming difficult to afford?

Understanding why a home uses energy is useful, but sometimes the immediate problem is affordability.

If household bills are becoming difficult to manage or payments have already been missed, our guide to what to do if you're struggling to pay household bills explains where to start and where to find free support.

You can also look at the wider picture using our guide to how much your home really costs to run.

A clearer picture of your home can help

No single figure tells you everything about how a home performs.

An EPC provides one type of information. Your meter readings and bills show another. The heating system, insulation, property condition and the way the home is actually used add further context.

Looking at those pieces together can give you a much clearer understanding of why your home's energy use may be different from what you expected.

Use your House Krowd account to keep bills, meter readings and dated observations together. If you rent and notice a possible repair problem, report it through your landlord's usual channel too; a clear record can help them investigate.

Frequently asked questions

Why is my energy bill higher than expected?

A higher bill can be caused by increased energy consumption, changes in energy prices or a combination of both. Compare the kWh used as well as the amount charged, and check for changes in weather, occupancy, heating patterns, appliances, meter readings and your tariff.

Can two similar homes have different energy bills?

Yes. Even similar properties can have different insulation, heating systems, improvements, occupancy patterns and household energy use. The residents may also be on different energy tariffs.

Does an EPC show how much energy I will actually use?

Not exactly. An EPC uses standardised assumptions to assess a property's energy performance and allow comparison between properties. Actual household energy consumption also depends on factors such as occupancy, heating behaviour, weather, hot water and appliance use.

Should I compare energy bills in pounds or kWh?

Both can be useful, but kWh is particularly helpful when you are trying to understand whether your actual energy consumption has changed. The amount charged in pounds is also affected by energy prices, tariff rates and standing charges.

Keep exploring your home

You can also read our guide to how changes in energy use can form part of your home's history.

Why Does Your Home Use More Energy Than You Expect?