How long will it take for energy efficiency measures to pay back?

How long will it take for energy efficiency measures to pay back?
13th April 2023

We all need to learn more about how to reduce our energy bills and take steps to ensure our homes are as energy efficient as possible. But many of us are understandably concerned about how much these things will cost and whether the financial outlay will be worth it, especially when we see quotes of tens of thousands of pounds for solar energy or heat pumps.

So, what measures are considered to work and how long will it take for the investment to ‘pay back’?

What energy efficiency measures can you do right now that will pay back quickly?

The first thing to bear in mind is that not all energy efficiency measures are expensive - some cost very little but can save hundreds of pounds.

These include things like getting a smart meter to measure energy use. Although everyone contributes to the cost of installing the meter through their energy bills, you don’t have to pay anything up front to make the switch. Once you have one, you can immediately save money by looking at how much you’re spending on different appliances and where you might be wasting energy.

For little or no financial outlay, you may be able to save hundreds of pounds off your energy bills over the course of a year by:

  • Turning off appliances at the socket at night instead of leaving them on standby, e.g. TVs
  • Turning your thermostat down, even by just a couple of degrees
  • Using electric blankets either instead of, or to top up the heating
  • Closing curtains at sundown
  • Using a slow cooker instead of putting the oven on

Small cost energy efficiency changes

Investment in things like energy efficient light bulbs, draught excluders, heavy lined curtains, chimney balloons and easy to fit window insulation can cost a few hundred pounds and save the equivalent in the first year, so these are small changes you can make that should pay back within a year or so.

For example, switching bulbs to LEDs can save up to £65 a year*; if you have an open fire, a chimney balloon could save up to £90 a year; adding window film as secondary glazing could save up to £45 a year.

*Savings based on a typical gas-heated three bedroom semi-detached home with gas tariff of 10.3p/kWh and electricity tariff of 34p/kWh. Energy Saving Trust, correct as of October 2022.

Of course, you have to spend a little to save a little in this case, but these changes can benefit you in two ways:

1. Reduce energy bills

2. If you are selling or letting the property, these changes could boost your EPC rating, which can improve the rent or price you secure for your home.

Larger investments in energy efficiency

It would be very easy to spend thousands of pounds on energy saving measures such as a new boiler, a heat pump, insulation, double or triple-glazed windows and solar panels.

However, these can take time to pay back and may even never do so. Certain measures might not suit your home or even be possible to do, especially if you’re in a conservation area or have a listed building. As such, it’s vital that, before you spend any money, you have an expert energy assessor or surveyor check out the changes you are planning and determine whether they’re appropriate for your specific property and its construction.

Here are some of the quoted ‘payback’ scenarios for energy efficiency measures:


This can be in the roof or loft, walls and floors. To keep costs down it’s ideal to install insulation at the point of building or renovating a home. Costs can vary from just under £400 through to £1,800, depending on the size and makeup of the property. According to the Energy Saving Trust, “whether you live in a large detached house or small flat, you should be able to make back the installation cost in five years or less due to the yearly energy bill savings you will make.”

New boiler

Although a new boiler system can cost thousands of pounds to install, especially if you need to change pipework or fit new radiators, it can be very cost effective versus other energy efficient ways of heating a home, such as via a heat pump.

And a new boiler could help upgrade your home to an EPC rating of C or above, which could mean you not only save energy, but also improve the value of your property, so your investment might pay back pretty quickly. Getting your EPC rating up into the A-C range is especially important if you are a landlord. Currently there are some reports that suggest a C rating will be the new minimum rating required to let a property from 2028, but the government have not confirmed this and it may take more months before we know the actual deadline.  

Boiler upgrade scheme

This is a government scheme to encourage high efficiency heating systems, such as heat pumps or biomass boilers. They can cost tens of thousands of pounds and require a lot of space for the installation and new pipework, so would be difficult to retrofit and may not suit terraced or small properties.

The scheme offers £5-6k off the cost of installation and operates up to 2025. See the Energy Saving Trust website for more information.

To work out a payback time, you will need to talk to a specialist who can give a bespoke view on your property and the system you are considering fitting.

Windows and door upgrades

According to the Energy Saving Trust“A set of A-rated windows for a semi-detached house will typically cost around £7,500. By installing A-rated double glazing to windows in an entirely single-glazed semi-detached gas heated property, you could save £195 a year.”

Although the payback purely in terms of energy bill savings may be a long time, if you’re letting or planning on selling the property and the upgrade increases the capital value, you may get payback much sooner.

Solar panels

As with the boiler upgrade scheme, understanding the investment needed and payback of solar panels requires an expert assessment of your specific property. Some people who were early adopters of alternative energy sources have done well out of various schemes over the years, but this type of subsidised payback has now been greatly reduced.

The cost of solar panels can range from £6,000 to £20,000 for a large home and can take seven or more years to pay back. So it’s a big investment and might only be something you want to do for your forever home, building the cost in at the point you start a build, undertake renovation or buy a home.

Overall, efficiency changes that you can do to a home range from zero to tens of thousands of pounds. Whether this is right for you, the property and indeed your budget depends on the type of property and the level of changes you are happy to make to be more energy efficient. What’s important to be aware of is that if you are planning to spend thousands of pounds, it is worth getting expert, independent advice for your particular property and circumstances so you know what costs and payback you could achieve.

Be careful, not all energy efficiency changes work!

There are two types of changes you need to be particularly careful about: insulating walls and spray foam insulation in a roof. Properties need to ‘breathe’ and, in some cases, cavity wall insulation and excessive application of spray foam insulation have caused serious condensation problems.

RICS has investigated both of these and explain that it’s important to (a) have an expert identify whether a particular type of insulation is the right solution, and (b) use an expert that really knows what they are doing for the installation.

And it’s important to be aware that the consequences of getting this wrong are quite severe. If you fit spray foam insulation it can mean your property is un-mortgageable, which is likely to greatly reduce its value as it can only be sold to a cash investor, and can also affect your ability to secure equity release. Given that there are plenty of other ways to insulate your home to achieve the same effect as spray foam insulation, it’s certainly worth considering these first.

For more on cavity wall insulation issues, visit the RICS website, and for information on potential issues with spray foam insulation, see RICS and the Property Care Association.

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