Why are my energy bills so high, and what should I look at first?
The largest single line in most UK energy bills is heating, followed by hot water, then the always-on electrical load that runs in the background. Reducing the bill almost always starts with where the heat is going rather than how it is being produced. Generation and storage become much more powerful once consumption has been understood.
What it usually looks like
These are the symptoms readers describe most often. None of them alone is diagnostic, but together they build a picture.
- Bills noticeably higher than neighbours in similar homes
- Heating dominant in the annual cost
- Standing charges feel disproportionate
- Unsure where the kilowatt-hours are actually going
Most common in: Postwar semi (1945–1980) · Interwar semi (1920s–1930s) · Modern detached (post-2000) · Victorian terrace
Before you buy anything
Watch the house respond as you scroll.
These checks are listed in the order we would work through them. The illustration on the left changes with each one, so you can see what each check is actually addressing before deciding whether it is worth doing.
Heat leaves through every uninsulated surface. The room cools faster than the boiler can refill it.
Look at twelve months of statements together
A single quarter tells you very little. The annual shape reveals how much is heating, how much is constant load and how much is summer use.
Spend an evening tracing the always-on load
A smart plug on the fridge, the broadband router, the TV and the chargers in the kitchen will usually identify several hundred kilowatt-hours of avoidable use per year.
Check the loft and the walls
Fabric improvements reduce the bill every year for the lifetime of the house. They are unglamorous and they work.
Review your tariff
A time-of-use tariff suits some households dramatically better than a flat one, especially with a heat pump, an EV or solar. Comparing once a year is worth the half-hour.
Decide where the money is meant to come back from
Solar reduces the import bill but does not change heat loss. Insulation reduces consumption but generates nothing. Understanding which one your home actually needs is the only way to spend well.
Products that may help
Only consider these once the checks above have been ruled out. A product fitted into the wrong cause is rarely satisfying.
The cheapest answer to energy bills feel too high is usually the one that addresses the cause rather than the symptom. The list above is in the order we would work through it, because the checks at the top tend to rule out the most expensive mistakes further down.
Run the Home Comfort Score for this room
A two-minute reading gives you a number to compare against after each improvement, so you know what is actually working.