Cheap home improvements that actually cut bills

Home improvements run the full gamut from basically-free tweaks through to serious investments. Some genuinely save you money, and others are heavily marketed as savings but barely make a dent in your bills. Here’s what actually works.

Quick wins (under £50)

Draught-proofing

When cold air leaks in, your heating has to work harder. Sealing the gaps is cheap and surprisingly effective.

Area	DIY Fix	Cost	Annual Saving
Windows	Foam tape or brush strips	£5-£15	£25-£35
External doors	Brush strips, letterbox cover	£10-£30	£25-£45
Floorboards	Filler, sealant, or rugs	£10-£20	£20-£30
Chimney	Balloon or cap	£20-£40	£40-£90
Skirting gaps	Decorator’s caulk	£5-£10	£10-£20

Most draught-proofing is dead simple DIY. Spend a Sunday afternoon on it and you could cut £100+ off your annual heating bills. Just don’t seal airbricks, trickle vents, or extractor fans - your home needs that ventilation.

LED bulbs

LEDs use 80% less energy than old-style incandescent and 25% less than CFLs.

Bulb Type	Cost Per Bulb	Annual Running Cost (3hrs/day)
Incandescent (60W)	£1	£7-£8
CFL (15W)	£3-£5	£2
LED (8W)	£2-£5	£1

You’re saving £5-£7 per bulb per year, which means they pay for themselves in under 12 months. Replace them as they fail instead of doing your whole house at once.

Chimney balloon/cap

Open chimneys lose massive amounts of heat. A balloon (inflatable blocker) or cap costs £20-£40 and saves up to £90 a year. Only works if you don’t actually use the fireplace - obviously remove before lighting any fires.

Reflective radiator panels

Panels behind radiators on external walls bounce heat back into the room instead of warming the outer wall.

Cost	Annual Saving	Payback
£20-£40 for multiple radiators	£20-£40	~1 year

Takes minutes to install yourself. If your walls are poorly insulated you’ll save more.

Hot water cylinder jacket

Got a hot water tank without a jacket? Adding one stops heat leaking away.

Cost	Annual Saving	Payback
£15-£25	£30-£50	~6 months

Simple DIY job (unless your tank’s already jacketed or in an airing cupboard you want to stay warm).

Medium investment (£100-£500)

Loft insulation (DIY)

Adding or topping up loft insulation is honestly one of the best home investments you can make.

Current Insulation	Action	Cost (DIY)	Annual Saving
None	Install 270mm	£300-£400	£200-£300
100mm	Top up to 270mm	£150-£250	£100-£150
270mm	None needed	-	-

Mineral wool rolls are cheap from DIY stores. The work itself is straightforward but genuinely uncomfortable - wear protective clothing, a mask, and goggles. Payback is typically 2-4 years.

Thermostatic radiator valves (TRVs)

TRVs let you control the temperature in each room independently. Turn down radiators in rooms you’re not using.

Cost	Annual Saving	Payback
£10-£20 per radiator (DIY) or £150-£300 (fitted)	£50-£100	1-3 years

DIY installation means draining the heating system, which isn’t everyone’s cup of tea. Professional fitting is straightforward if you’d rather not mess with plumbing.

Smart thermostat

These learn your habits and adjust heating automatically.

Product	Cost	Annual Saving
Hive, Nest, Tado	£150-£250	£50-£150

How much you save depends on how inefficiently you were heating before. If you already use timers and manual controls properly, the extra benefit is smaller. Professional installation is usually included or costs £50-£100 extra.

Bigger investment (£500+)

Cavity wall insulation

Filling the gap in cavity walls really does reduce heat loss.

Cost	Annual Saving	Payback
£500-£1,500 (professional only)	£100-£200	3-8 years

Not every property is suitable - some cavities shouldn’t be filled (rubble-filled, damp problems, too narrow), so get a proper survey first. If you qualify for the ECO scheme (based on benefits), it might be free.

Double glazing

Replacing single glazing with double cuts heat loss through windows.

Cost	Annual Saving	Payback
£3,000-£7,000	£80-£120	25-50+ years

The energy payback is very long. Double glazing makes more sense for comfort (no cold draughts), noise reduction, property value, and how it looks. Don’t rely on energy savings to justify it.

Solar panels

These generate electricity from sunlight.

Cost	Annual Saving	Payback
£5,000-£8,000	£200-£500	10-20 years

Your savings depend on roof orientation (south is best), how much electricity you use during daylight, whether you export to the grid (earning money via Smart Export Guarantee), and future electricity prices. Solar’s more sensible if you’re home during the day or have an electric car.

Heat pumps

These replace gas boilers with electric heating.

Type	Cost	Annual Saving
Air source	£8,000-£15,000	Variable
Ground source	£15,000-£25,000	Variable

Currently, savings compared to gas are marginal or even negative (electricity costs more per kWh than gas). Heat pumps make more sense for properties off the gas grid (using oil or LPG), well-insulated homes, environmental reasons, or waiting for electricity prices to drop relative to gas. Government grants reduce costs by £7,500.

What’s usually not worth it

”Improvement”	Why It’s Often Poor Value
Boiler upgrade (working boiler)	New boilers are only 5-10% more efficient than 10-year-old ones
Electric heaters “to supplement”	Electric costs more per kWh than gas
Gadgets claiming huge savings	If it sounds too good to be true, it is
Premium energy monitors	Your free smart meter display does the same thing

Stick with the basics first: draught-proofing, insulation, and behaviour changes. These give the best return for most homes.