If you’re reading this, you’ve already done the hard part. You’ve looked at your energy bill, felt that familiar lurch, and decided you want to do something about it. Good. This guide is the “what to do” part.
Knowing how to reduce energy bills isn’t about memorising 50 random tips from the internet. It’s about working through a structured plan, starting with the things you can do right now for free, and building up to the bigger investments when you’re ready. That’s exactly what this guide does.
This guide is split into four levels. Level 1 costs nothing and takes minutes. Level 4 involves significant investment but can transform your running costs for decades. You don’t have to do all four. Start where it makes sense for your budget, your property, and whether you own or rent.
If you haven’t worked out why your bill is high yet, start with Why Are My Energy Bills So High? A Complete Diagnostic Guide first. And if your bill itself is confusing, Understanding Your Energy Bills breaks down what every line means.
Level 1: The “Do It Today” List (Zero Cost)
These changes cost nothing. Most take less than ten minutes. And the savings are genuine, not theoretical “up to” numbers plucked from thin air.
Here’s what’s in this level at a glance:
| Action | Time Needed | Estimated Annual Saving | Who It’s For |
|---|---|---|---|
| Lower boiler flow temperature to 55–60°C | 5 mins | £65–£100 | Combi boiler owners |
| Wash clothes at 20–30°C | Instant | £20–£40 | Everyone |
| Close curtains at dusk | Instant | £15–£30 | Everyone, especially older windows |
| Turn thermostat down by 1°C | Instant | £90–£150 | Everyone |
| Switch off standby properly | 10 mins | £30–£50 | Everyone |
| Bleed your radiators | 10 mins | Varies (efficiency gain) | Anyone with cold-topped radiators |
| Check your tariff | 10 mins | Varies (often £50–£200+) | Anyone on a standard variable tariff |
| Total potential | Under 1 hour | £215–£365+ |
Lower your boiler flow temperature
This is the single biggest hidden saving for anyone with a combi boiler, and most people have never heard of it.
Here’s what’s going on. Most combi boilers are installed with the flow temperature set to 75–80°C. That’s far higher than what’s needed to heat your home. At those temperatures, the boiler can’t run in condensing mode, which is the efficient mode it was designed to use. Lowering the flow temperature to 55–60°C keeps the boiler condensing properly and can save around 6–9% on your gas usage.
This isn’t guesswork. Nesta’s Money Saving Boiler Challenge, backed by research including the Salford Energy House study, found an average saving of around £112 per year at the energy prices at the time. At current gas rates, that translates to roughly £65–£100 per year depending on your usage and starting settings. More than three million households have already made this change.
One important caveat: this applies to combi boilers only. If you have a system or regular boiler with a hot water cylinder, don’t drop the cylinder temperature below 60°C. Legionella bacteria can grow in stored water below that threshold.
Worth noting: the updated Part L Building Regulations now mandate a maximum 55°C flow temperature for new or replacement heating systems. The industry is catching up to what the evidence has been saying for years.
Wash clothes at 20–30°C
Modern detergents are formulated to work at low temperatures. Washing at 30°C instead of 40°C uses significantly less electricity per cycle, and for everyday clothes, the cleaning performance is essentially the same.
You’ll still want occasional hot washes for towels, bedding (especially if anyone has allergies or dust mite sensitivities), and anything that needs sanitising. But for the majority of your laundry, cold washes work fine.
Close curtains at dusk, not bedtime
This is one people overlook. Lined curtains over windows act as an extra insulation layer, reducing heat loss through the glass during early evening hours when your heating is working hardest. The difference is most noticeable with single-glazed or older double-glazed windows.
The key is timing. Close them as it gets dark, not when you go to bed. Those few extra hours matter.
Turn the thermostat down by 1°C
The classic advice, but it earns its place on every list because it works. Each 1°C reduction cuts heating costs by roughly 8–10%. If you’re currently at 22°C, try 21°C for a week. Most people genuinely don’t notice the difference.
If you do notice it, try it for a fortnight. Your body adjusts. And a light jumper is free.
Switch off standby (properly)
TVs, games consoles, set-top boxes, phone chargers left plugged in, monitors on sleep mode. Individually, the draw from each device is small. Collectively, a typical household spends £30–£50 per year powering things that aren’t being used.
A plug-in energy monitor (more on that in Level 2) helps you identify the worst offenders. Games consoles in standby are usually the surprise culprit.
Bleed your radiators
If your radiators have cold spots at the top, there’s trapped air preventing them from heating evenly. The boiler then works harder trying to get the room to temperature, and you end up paying more for less warmth.
A radiator key costs a pound or two, but you probably have one in a kitchen drawer already. The whole job takes ten minutes. No cost, immediate improvement in how your heating performs.
Check your tariff
This isn’t exciting, but it matters. A lot of people are still sitting on their supplier’s standard variable tariff, paying the maximum price cap rate, when a better deal is available. Spend ten minutes on a comparison site. If you have a working smart meter, you may also qualify for tracker or time-of-use tariffs that can save considerably more (covered in Level 3).
That’s potentially £215–£365 per year for doing things that cost nothing and take less than an hour combined. Not bad for a Saturday morning.
Level 2: The “Small Spend” Upgrades (Under £50)
These require a small upfront cost, but every one of them pays for itself within weeks or months. Think of this as the level where a bit of spending now saves you meaningfully over the next few years.
Here’s what’s in Level 2 at a glance:
| Upgrade | Typical Cost | Estimated Annual Saving | Payback Period |
|---|---|---|---|
| Swap halogens/CFLs for LEDs | £2–£5 per bulb | £5–£15 per bulb | 2–3 months |
| Radiator reflector panels | £5–£15 | £10–£20 | ~1 year |
| Draught-proofing kit | £20–£30 | £30–£60 | Under 1 year |
| Plug-in energy monitor | £15–£30 | Informs all other savings | Indirect |
| Hot water cylinder jacket | Under £20 | £35–£60 | 4–6 months |
| Reflective film / thermal linings | £15–£40 | £15–£40 | ~1 year |
LED bulbs everywhere
If you still have halogen or old CFL bulbs anywhere in your home, swap them out. An LED equivalent uses about 75–80% less electricity and lasts years longer. The payback period per bulb is roughly 2–3 months.
Kitchen and bathroom spotlights are the usual holdouts. GU10 halogens are still lurking in millions of ceilings, each one quietly burning through 50 watts when a 5-watt LED would do the same job.
Radiator reflector panels
Foil panels fitted behind radiators on the internal side of external walls reflect heat back into the room instead of letting it warm the brickwork behind. They cost around £5–£15 for a pack and take minutes to fit.
They’re not transformative on their own. But they’re a genuine incremental gain, and in a draughty older home with radiators on every exterior wall, the difference is noticeable.
Draught-proofing
Brush strips for doors. Foam tape for window frames. Letterbox draught excluders. Chimney balloons for open fireplaces. Keyhole covers.
This is the one that often makes the biggest difference to how warm the house feels without touching the thermostat. Cold draughts force you to turn the heating up to compensate, so sealing them is really a heating efficiency measure in disguise.
For a draughty property, the cost of materials is usually under £30. The comfort improvement is immediate.
A plug-in energy monitor
Knowing which appliances cost the most to run is the foundation for almost every other decision in this guide. A plug-in energy monitor or a smart plug with energy monitoring lets you measure actual consumption rather than guessing.
If you have a smart meter, your supplier’s app (Octopus, OVO, E.ON Next, and others all offer this) can break down your usage by time of day. Standalone monitors give you appliance-level data. Either way, the information changes your behaviour. You stop guessing and start making decisions based on real numbers.
Hot water cylinder jacket
If your home has a hot water tank and it’s either uninsulated or has a thin, old jacket on it, this is one of the quickest paybacks in home energy. A British Standard jacket at least 75mm thick costs under £20 and can save roughly £35–£60 per year depending on the current state of insulation.
That’s a payback period of a few months. Worth checking.
Reflective window film or thermal curtain linings
For renters who can’t change the glazing, or anyone with single-glazed or failing double-glazed windows, these are a worthwhile stopgap. Thermal curtain linings add an insulating layer. Reflective window film reduces heat loss through the glass itself.
Neither is a replacement for proper double glazing. But both are a genuine improvement, especially in older properties where the windows are the weakest link in the building envelope.
Appliance Running Costs: What Things Actually Cost to Use
Before moving to Level 3, it’s worth understanding what your appliances are costing you. These figures are based on the Q2 2026 average electricity rate of approximately 24.7p/kWh.
The tumble dryer stands out. It usually costs more per use than any other household appliance. If you can line-dry even half your laundry, the savings add up quickly across a year.
A few things jump out. The oven and tumble dryer are the expensive ones. The TV, phone charger, and even a gaming PC are relatively cheap per hour. The shower adds up only because most households use it multiple times a day. And the kettle? Barely worth thinking about per boil, despite what certain newspaper columnists would have you believe.
Level 3: The “Smart Tech” Strategy
This level assumes you have, or are willing to get, a working SMETS2 smart meter. The meter itself is free from your supplier and is the foundation everything here builds on. Without it, you’re flying blind. With it, you unlock the tariffs and data that make real savings possible.
Here’s what’s in Level 3 at a glance:
| Strategy | Typical Cost | Estimated Saving | Best For |
|---|---|---|---|
| Switch to tracker or agile tariff | Free | 15–25% off standard variable | Engaged users willing to shift usage |
| Time-of-use tariffs & load shifting | Free | £100–£300+ | EV owners, heat pump owners, flexible households |
| Smart thermostat | £100–£220 | £75–£150 | Multi-room homes, irregular schedules |
| Smart TRVs | £40–£80 per radiator | Varies by zoning | Homes heating unused rooms |
| Smart plugs | £10–£25 each | £20–£50 total | Anyone on a time-of-use tariff |
| Using smart meter data (apps) | Free | Informs all savings | Everyone with a smart meter |
Switch to a tracker or agile tariff
Standard variable tariffs charge you the same rate all day, every day. Tracker and agile tariffs link your price to wholesale energy costs, which fluctuate by the half-hour.
Octopus Tracker follows a day-ahead wholesale price. Octopus Agile updates every 30 minutes. Other suppliers have their own versions. E.ON Next, EDF, and OVO all offer time-of-use or tracker-style options.
The honest answer is that these tariffs aren’t for everyone. They require some engagement. Prices can spike during wholesale peaks. But for households willing to shift some usage to cheaper periods, savings of 15–25% compared to the standard variable rate are realistic.
If wholesale prices are currently low, a fixed tariff might also be worth considering. You lock in a rate and get certainty. The trade-off is that if wholesale prices drop further, you’re stuck paying the fixed rate. If they rise (as many analysts forecast for later in 2026), you’re protected.
Time-of-use tariffs and load shifting
This is where the smart meter really earns its keep. Time-of-use tariffs charge different rates at different times of day. Electricity is cheapest overnight and most expensive during the early evening peak.
Running your dishwasher, washing machine, or tumble dryer during off-peak windows costs meaningfully less. For EV owners, Octopus Intelligent Go offers cheap overnight rates specifically designed for smart charging. Octopus Cosy does something similar for heat pump owners. Other suppliers have equivalent offerings.
Some tariffs include “plunge pricing” or free electricity windows where surplus renewable energy pushes wholesale prices to zero or below. These happen most often on windy, sunny days when demand is low.
One caveat: if you don’t actually shift your usage, a time-of-use tariff can cost you more than a flat rate. The savings only materialise if you change when you use energy.
Smart thermostats and smart TRVs
The real value of smart heating isn’t the “smart” label. It’s zoning and scheduling. Being able to heat only the rooms you’re using, at the times you’re using them, rather than warming the whole house uniformly, is where the savings come from.
Nest, Hive, tado°, and Drayton Wiser are the most common options. Smart TRVs (thermostatic radiator valves) let you set different temperatures room by room.
Worth being honest here: a basic mechanical programmer and manual TRVs achieve a large chunk of the same result for a fraction of the cost. Smart systems add convenience and finer control, but they’re not magic. If budget is tight, manual zoning is still well worth doing.
Smart plugs and automation
Smart plugs let you schedule devices to turn off completely at night, time your immersion heater to run only on cheap-rate electricity, and automate routines that would otherwise rely on you remembering. They’re cheap, simple to set up, and particularly useful paired with a time-of-use tariff.
Using your smart meter data properly
The in-home display is just the start. Supplier apps, along with third-party tools like Loop, Bright, and Hugo, offer more detailed breakdowns of your usage by time, day, and season. Half-hourly consumption data is what makes Levels 1–3 genuinely effective, because you can see exactly what’s costing what and when.
Knowing your baseline is the difference between guessing and planning.
Level 4: The “Big Moves” (High Investment, High Reward)
These are the upgrades that cost real money upfront. They’re not quick wins. But for the right property, in the right circumstances, they can reduce your energy bills by 50% or more and keep doing so for decades.
Be realistic about payback periods. These are long-term investments, not impulse buys.
Here’s what’s in Level 4 at a glance (full comparison table with payback periods appears at the end of this section):
| Upgrade | Typical Cost | Estimated Annual Saving | Payback Period | Best For |
|---|---|---|---|---|
| Loft insulation (0 to 270mm) | £300–£1,200 | £150–£300 | 1–4 years | Almost everyone |
| Cavity wall insulation | £1,000–£4,300 | £120–£420 | 3–5 years | Pre-1990 homes with unfilled cavities |
| Solid wall insulation | £5,000–£15,000+ | £150–£400 | 10–15+ years | Pre-1920s solid wall properties |
| Solar panels (4kW) | £5,000–£8,000 | £250–£500 | 8–12 years | Owners with south-facing roofs |
| Solar + battery | £8,000–£14,000 | £400–£700 | 10–15 years | High daytime usage or time-of-use tariff users |
| Air source heat pump | £2,500–£10,000 (after £7,500 grant) | £100–£400 vs gas boiler | 8–15 years | Well-insulated homes replacing gas/oil |
| Double/triple glazing | £3,000–£10,000+ | £75–£150 | 15–20+ years | Properties with single or failed double glazing |
| EV smart charging setup | £0–£800 | £200–£500 | Immediate–1 year | EV owners on time-of-use tariffs |
Professional insulation (loft, cavity wall, solid wall, floor)
The fabric-first principle is simple: insulate before you upgrade your heating system. There’s no point fitting a heat pump in a house that leaks heat through the walls and roof.
Loft insulation is the cheapest and most impactful starting point. Topping up to the recommended 270mm of mineral wool can save a typical semi-detached house £150–£300 per year, depending on existing insulation levels. For homes with no existing loft insulation, this is one of the best returns on investment available.
Cavity wall insulation has a typical payback of 3–5 years and can save £120–£420 per year depending on property type. Most homes built between 1920 and 1990 have cavities that can be filled, though it’s critical to check suitability first. Not all properties are appropriate candidates.
Solid wall insulation (internal or external) is expensive, typically £5,000–£15,000 or more, but it’s critical for older properties built before cavity walls became standard. Payback periods are longer, usually 10–15 years.
Floor insulation for suspended timber floors can save around £80 per year and is often overlooked.
Grant funding may be available. The ECO scheme and Great British Insulation Scheme have largely wound down as of spring 2026, but the government’s Warm Homes Plan includes new local grant funding for eligible households. Check what’s available in your area.
Solar panels and battery storage
The economics of domestic solar have improved significantly. A typical 4kW system on a south-facing roof in the UK generates roughly 3,400–3,800 kWh per year. At current electricity prices, that’s worth around £840–£940 in avoided grid electricity, assuming you use it all. The problem is that without a battery, you’ll typically only use around 30% of what you generate directly (the rest gets exported when you’re out or not using much).
Adding a battery pushes self-consumption to 60–70% or more. Export tariffs mean your surplus still earns you something (typically 4–15p/kWh depending on supplier), but using the electricity yourself is always more valuable than exporting it.
Typical costs: £5,000–£8,000 for panels alone, £8,000–£14,000 with a battery. Payback is typically 8–12 years for panels, longer when you include the battery. The battery makes more financial sense when paired with a time-of-use tariff, as you can charge from the grid overnight at cheap rates and discharge during the expensive peak.
Be realistic. This is a 25-year investment that pays for itself over time. It won’t halve your bill overnight. Solar Panels Guide covers the full picture.
Heat pump transition
Air source heat pumps (ASHPs) are the primary alternative to gas boilers for home heating. They extract heat from outdoor air (yes, even in winter) and are roughly 3–4 times more efficient than a gas boiler per unit of energy input.
The £7,500 Boiler Upgrade Scheme grant makes a significant dent in the upfront cost, which typically runs £10,000–£18,000 before the grant. After the grant, many installations come in at £2,500–£10,000 depending on property size and complexity.
Here’s where it gets interesting, and where honesty matters. A heat pump works brilliantly in a well-insulated home with adequately sized radiators. In a poorly insulated property, it’ll struggle, run inefficiently, and cost more to operate than a gas boiler. Insulate first. This is not optional.
Running costs depend heavily on your electricity tariff. On a standard rate, a heat pump’s running costs are comparable to gas. On a heat pump-specific tariff like Octopus Cosy, they can be significantly cheaper. The Future Homes Standard will require low-carbon heating in all new-build homes, so this direction of travel is set.
Heat Pumps Guide goes into detail on suitability, costs, and what to ask your installer.
Double or triple glazing upgrades
Often the last piece of the fabric-first puzzle. New double or triple glazing for a whole house typically costs £3,000–£10,000 or more, with payback periods of 15–20 years based on energy savings alone.
The honest case for glazing upgrades is usually comfort, noise reduction, and property value rather than pure energy savings. If you’ve done everything else and your windows are the remaining weak point, it’s worth doing. Just don’t expect it to pay for itself quickly.
EV smart charging
For households with an electric vehicle, how you charge it matters a lot. Charging on a standard rate during the day could cost £0.25/kWh or more. Shifting to overnight off-peak rates (Octopus Intelligent Go, for example) brings that down to 7–10p/kWh. Over a year of typical driving (around 8,000 miles), that’s a saving of several hundred pounds compared to daytime charging.
Renters: What You Can Actually Do
Let’s be straight about this. If you rent, Level 4 is off the table and parts of Level 2 and 3 are limited. That’s frustrating, especially when your landlord is the one who benefits from property improvements while you’re the one paying the energy bills.
But you’re not powerless. Here’s what’s realistic.
Levels 1 and 2 are fully available. Every zero-cost change in Level 1 works regardless of tenure. Draught-proofing with removable materials, LED bulbs, energy monitors, curtain linings: all of Level 2 works for renters. These alone can realistically save £200–£400 per year.
Level 3 is mostly available. You can switch tariffs (it’s your energy account, not the landlord’s). Smart plugs work anywhere. A smart thermostat is trickier since you’d need the landlord’s agreement for installation, but it’s worth asking.
What to ask your landlord for. You have more leverage than you might think. The current legal minimum EPC rating for rental properties is E, with the government planning to raise this to C by 2030. Landlords face increasing pressure to improve their properties. You can reasonably ask about loft insulation, boiler servicing (a well-maintained boiler runs more efficiently), cavity wall insulation, and whether the property qualifies for any grant-funded upgrades.
The Homes (Fitness for Human Habitation) Act 2018 requires landlords to ensure properties are fit for habitation, which includes adequate thermal insulation and heating. If your home is genuinely cold and inefficient, you have grounds to push for improvements.
A Note on “Savings Calculators” and Claimed Figures
Every savings figure in this article, and every figure you’ll find anywhere else online, is an estimate based on typical usage. Your actual savings depend on your property type, how many people live there, your existing efficiency levels, your local climate, and your individual habits.
The figures here are directional. They’ll give you a good sense of what’s worth doing and roughly what to expect. They’re not guarantees.
Our Direct Debit Calculator can help you check whether your monthly payments are set at the right level for your actual usage, which is a different but related problem.
Frequently Asked Questions
What’s the single most impactful thing I can do for free?
If you have a combi boiler, lower the flow temperature. For most combi boiler owners, this is the biggest free saving available, around £65–£100 per year. If you don’t have a combi boiler, turning the thermostat down by 1°C is the next best move.
Is it worth switching to a fixed tariff right now?
It depends on where wholesale prices are heading, and nobody knows that for certain. As of spring 2026, the Q2 price cap is £1,641, but analysts forecast a significant rise for Q3 2026 due to geopolitical uncertainty. If a fixed deal is available at or below the current cap level, it might offer useful protection against a summer price rise. If it’s priced well above, you’re paying a premium for certainty. Compare carefully and consider how much price volatility you’re comfortable with.
Do I need a smart meter to save money?
No. Every measure in Levels 1 and 2 works without one. But a smart meter makes everything in Level 3 possible and makes Levels 1 and 2 more effective because you can actually see the impact of changes in near real-time. It’s free from your supplier and there’s no good reason not to get one.
Are heat pumps worth it in 2026?
For the right property, yes. A well-insulated home with adequately sized radiators, replacing an oil or LPG boiler, with access to a good electricity tariff: that’s the sweet spot. The £7,500 Boiler Upgrade Scheme grant makes the economics significantly better than they were a few years ago. For a poorly insulated house still on gas, the case is weaker until you’ve addressed the insulation first. It’s not a yes-or-no answer. It depends on your starting point.
Will my energy bills go down this year?
They’ve dropped for Q2 2026 thanks to the price cap falling to £1,641. But forecasts suggest the Q3 cap (July onwards) could rise substantially, with some analysts predicting figures near £1,900–£1,970. Nobody can promise where prices will be in six months. What you can control is how much energy you use and when you use it. That’s what this guide is for.
Can renters really save much?
Yes. Levels 1 and 2 are fully available to renters, and the savings from these alone can realistically reach £200–£400 per year. Tariff switching in Level 3 adds more on top. You don’t own the bricks, but you do control the thermostat, the appliances, and the energy contract.
What Now?
You don’t have to do everything at once. That’s the whole point of the levels.
Start with Level 1 today. It’s free and takes less than an hour. Move to Level 2 this month, a few purchases that pay for themselves almost immediately. Consider Level 3 when you’re ready to engage with your tariff and your data. And plan Level 4 for when the budget and the circumstances are right.
Every level makes the next one more effective. A well-insulated, well-managed home on a smart tariff is a fundamentally different proposition from a leaky house on a standard variable rate. You don’t get there in a day, but you can start getting there today.
If you found this useful, the guides linked above go deeper on specific topics:
- Why Are My Energy Bills So High? A Complete Diagnostic Guide
- Understanding Your Energy Bills
This guide is current as of spring 2026. Energy prices, grants, and government policy change frequently. We’ll update this page as things shift.
