Most energy-saving advice assumes you own your home. Replace the boiler. Upgrade the insulation. Install solar panels. These moves matter, but they’re not available to the roughly 35 percent of people in major cities who rent. Renters often pay the energy bills but have no control over the assets that produce them.
The good news: most household energy waste isn’t locked behind structural upgrades. It’s in habits, settings, and small reversible interventions that any tenant can do. This article focuses on those.
The 80/20 of household energy
For most flats, roughly 80 percent of energy consumption falls into four buckets:
- Space heating (gas or electric).
- Hot water (gas, electric, or combination).
- Cooking and appliance use.
- Lighting and electronics.
The interventions that move the needle target these four categories specifically. Generic “turn things off” advice helps a little; targeted intervention in these buckets helps a lot.
Heating: the biggest lever
For UK flats, heating typically accounts for 50-60 percent of annual energy use. The most impactful renter-friendly interventions:
- Turn the thermostat down by 1°C. Reduces heating energy by roughly 10 percent. Most flats are heated to 21-22°C and can comfortably drop to 19-20°C with proper clothing.
- Heat occupied rooms only. If your flat has thermostatic radiator valves, turn them down in unused rooms (spare bedroom, hallway during sleep hours). Some unheated rooms is fine; it’s the constant whole-flat heating that’s expensive.
- Use the timer aggressively. Heat the flat for 30-45 minutes before you wake and before you arrive home. The rest of the time, lower setting or off. Continuous low heating is more expensive than scheduled cycles.
- Block draughts. A roll of draught-excluding tape costs £5 and seals gaps around windows and doors. Removable when you move out.
- Heavy curtains, closed at dusk. Significantly reduces heat loss through windows. Open during sunlight for free solar heat gain.
- Radiator reflectors. A foil panel behind radiators on external walls reflects heat back into the room rather than into the wall. £10 for a roll, install with double-sided tape.
Hot water: the second-biggest lever
Hot water is 15-25 percent of typical flat energy use. The renter-friendly fixes:
- Set the boiler to 55-60°C. Most boilers are factory-set to 70°C, which is hotter than needed and wastes energy. 55-60°C is hot enough to prevent legionella and sufficient for normal use.
- Shorter showers. A 5-minute shower uses roughly half the hot water of a 10-minute shower. The single largest hot-water saving available to most flats.
- Low-flow showerhead inserts. A £10 flow regulator screws into most showerheads and reduces flow by 30-40 percent. Reversible at move-out.
- Run dishwasher and washing machine on full loads only. A half-empty washing machine uses almost as much electricity and water as a full one.
- Cold-water laundry. 30°C or cooler for most loads. Cuts laundry energy by 60-70 percent.
- Insulate hot water pipes. Foam pipe sleeves (£3-5 per metre) on exposed pipes prevent heat loss. Renter-friendly.
Appliances and cooking
The kitchen is the third major energy area:
- Use a kettle for boiling water, not the hob. Kettles are highly efficient (around 80 percent); hobs are much less so (40 percent for gas, 70 percent for induction).
- Match pot size to hob ring. A small pot on a large ring wastes 30-40 percent of the heat.
- Lids on pots. Boiling with the lid on uses roughly 25 percent less energy.
- Microwave for reheating. Uses a fraction of the energy of reheating in oven or on hob.
- Don’t pre-heat the oven for short cooks. Most things don’t need pre-heating; just put the dish in and add 5 minutes to the cooking time.
- Use the right appliance. A toaster uses less energy than the grill for toast. A pressure cooker uses less energy than a regular pot for stews.
- Run the dishwasher on eco mode. Takes longer but uses 30 percent less energy and water.
- Set fridge to 4-5°C and freezer to -18°C. Most are set colder than necessary. Each degree colder uses about 5 percent more energy.
Lighting and electronics
Lighting is a smaller share of energy use now that LEDs are standard, but easy to optimise:
- LED bulbs everywhere. If your flat still has any halogen or incandescent bulbs, replace as they fail. LEDs use 80-90 percent less energy. Tenant-friendly, take them with you when you move.
- Lower-wattage in non-task areas. A 4W LED bulb is fine for a hallway; you don’t need 10W everywhere.
- Switch off at the wall. Standby (phantom load) of TVs, set-top boxes, and consoles can be 10-15 percent of total electricity use. Use plug strips with switches to kill standby on multiple devices at once.
- Unplug chargers. Chargers draw small amounts of power even when nothing is connected. Trivial individually, meaningful across a household.
- Laptop instead of desktop. A laptop typically uses 30-50W; a desktop with monitor uses 150-300W.
The smart-meter question
If your flat has a smart meter, use it. Most show real-time consumption, which makes wasteful behaviours visible. Most users who pay attention to a smart meter for one month reduce their consumption by 5-10 percent purely from increased awareness.
If you don’t have a smart meter, ask your supplier, installation is free in most jurisdictions and improves billing accuracy.
The tariff question
One of the most impactful interventions has nothing to do with consumption: choosing the right tariff. Most people are on default tariffs that are 20-30 percent more expensive than the best available rate.
The fix: compare tariffs annually via a comparison site. Switching takes 15 minutes and typically saves £100-300 per year. Many tariffs now offer time-of-use pricing that rewards off-peak consumption, useful if you can shift laundry and dishwasher use to overnight hours.
Related: The Renter’s Guide to Low-Flow Showerheads
Renewable tariffs
Many suppliers now offer “100% renewable” tariffs. These are usually competitive on price with standard tariffs and ensure your supplier matches your consumption with renewable generation. The carbon savings are real (though some renewable tariffs are more rigorous than others).
Look for tariffs that source from named renewable generators (Octopus Energy, Good Energy, Ecotricity) rather than ones that just buy renewable certificates. The former is more impactful.
Related: Winter Heating Savings: A Realistic Tenant’s Playbook
The annual energy audit
Once a year, take 30 minutes to audit your energy use:
- Check your annual consumption (visible on bills).
- Compare to your previous year and to typical figures for similar flats.
- Identify one category to focus on for the year ahead.
- Check whether your tariff is still competitive.
- Review whether any appliances are due for replacement (failing appliances waste energy).
This annual check catches drift before it becomes expensive and identifies the next highest-impact intervention.
Related: Energy Monitor Plugs: Worth the Investment?
The cumulative impact
A tenant who implements the interventions in this article can reasonably expect to cut their energy bill by 20-40 percent without any structural changes to the flat. The savings on a typical £1,200 annual bill are £240-480, meaningful money for most households.
The carbon impact is similarly significant. A 30 percent reduction in a typical flat’s energy use saves around 800-1500 kg of CO2 per year, depending on the energy mix.
None of these interventions require landlord permission, structural changes, or significant upfront investment. They’re available to almost any tenant in almost any flat, starting today.
The energy math in one table
| Section | What the article covers |
|---|---|
| The 80/20 of household energy | For most flats, roughly 80 percent of energy consumption falls into four buckets: |
| Heating: the biggest lever | For UK flats, heating typically accounts for 50-60 percent of annual energy use. |
| Hot water: the second-biggest lever | Hot water is 15-25 percent of typical flat energy use. |
| Appliances and cooking | The kitchen is the third major energy area: |
| Lighting and electronics | Lighting is a smaller share of energy use now that LEDs are standard, but easy to optimise: |
Sources and further reading
Frequently asked questions
For most flats, turning the thermostat down by 1-2°C. Saves 10-20 percent of heating energy with minimal lifestyle impact, especially with proper warm clothing indoors.
No, common myth. Heating from cold for a few hours uses less energy than maintaining temperature 24/7. Use a programmable timer.
Yes, if available. Most renewable tariffs are price-competitive with standard tariffs and have meaningful carbon savings. Some are more rigorous than others; named-generator tariffs are best.
The meter itself saves nothing; the awareness it provides typically reduces consumption by 5-10 percent for engaged users. Worth installing for that reason alone.
