Still Overpaying on Energy? How to Cut Your UK Bills by Up to £400 a Year

The average UK household spends around £1,700 per year on gas and electricity. After the turbulence of 2022–24, many people assumed there was nothing left to save. That's not true. Switching tariffs, reducing usage smartly, and taking advantage of available grants can realistically save £200–£400 per year.

Here are seven proven steps, ranked from quickest to most impactful.

Step 1: Switch Energy Tariff (Potential Saving: Up to £200/Year)

This is the single biggest lever most households have. If you're sitting on a standard variable tariff (SVT) — which is where you end up by default when a fixed deal ends — you're almost certainly paying more than you need to. Fixed-rate tariffs are often 10–15% cheaper than the SVT price cap.

Use a comparison site to find the cheapest tariff for your postcode and usage profile. The whole process takes about 10 minutes, and switching is seamless — your supply doesn't change, just your billing company.

Step 2: Submit Regular Meter Readings

If you're not submitting monthly meter readings, your supplier estimates your usage — and estimates are almost always in their favour. Even with a smart meter, it's worth logging into your account to check that readings are transmitting correctly. Overpayments can accumulate into hundreds of pounds sitting in your energy account.

Step 3: Service Your Boiler (Potential Saving: £60–£100/Year)

An inefficient boiler uses significantly more gas to produce the same heat. An annual service (typically £80–£120) keeps it running at peak efficiency. If your boiler is more than 15 years old, replacing it with a modern condensing boiler can reduce heating costs by up to 30% — and government grants are available for eligible households.

Step 4: Install a Smart Thermostat (Potential Saving: £75–£150/Year)

Smart thermostats (e.g., Hive, Nest, tado°) learn your schedule and adjust heating automatically. They also let you control heating remotely via an app — so you're never heating an empty house. Studies suggest average annual savings of £75–£150 for households that install them. Most devices cost £100–£200 and can be fitted in under an hour.

Step 5: Draught-Proof Your Home (Potential Saving: £45–£60/Year)

Gaps around windows, doors, letterboxes and loft hatches let warm air escape and cold air in. Draught-proofing is cheap (DIY materials cost £20–£50) and can save up to £60 per year in heating costs. Focus on: external doors, sash windows, floorboards (if not solid), and the loft hatch.

Step 6: Eliminate Standby Power (Potential Saving: £30–£55/Year)

TVs, games consoles, phone chargers and streaming devices left on standby collectively cost the average UK household £35–£55 per year. Smart plug strips (£15–£25) can cut power to multiple devices simultaneously with a single switch — or set schedules so everything powers down automatically at night.

Step 7: Apply for Available Grants

The UK government offers several schemes that can dramatically reduce energy costs for eligible households:

• Great British Insulation Scheme: Free or subsidised loft and cavity wall insulation for low-income households or those with older homes.
• Boiler Upgrade Scheme: £7,500 grant towards a heat pump installation.
• Warm Home Discount: £150 off your electricity bill if you receive certain benefits.
• ECO4: Free energy efficiency improvements (insulation, boiler upgrades) for households on qualifying benefits.

How Much Could You Realistically Save?

A household that: switches to the cheapest fixed tariff (+£180), installs a smart thermostat (+£100), draught-proofs (+£50), and eliminates standby power (+£45) could realistically save £375 per year — without spending significantly or changing their lifestyle. That's the cost of a short UK break, or three months of a streaming service.