ROI: 2.3 Years
Energy Saving: High
CO2 Saving: High
ROI is the time it takes to return the investment in fuel savings for an average gas heated 3 bed semi-detached house and assumes no government incentive schemes are used: Years
How easy this is to do: DIY-Easy : DIY-Skilled : Specialist
How much energy will be saved with this measure: Low : Medium : High
What priority should be attached to this measure, this is based on the cost and ease with which it can be achieve togeteher with the savings in money and energy: Low : Medium : High
How much Carbon Dioxide emission will be saved with this measure: Low : Medium : High
If you have cavities in your walls which are not already filled with insulation then you have a great opportunity to save quite a lot of money. Most household heat is lost through the walls and anything to slow this down helps. The story is similar to loft insulation, you can reduce your energy bill for heating by up to 25%, but again more realistically 20%. The table below calculates the effect of only insulating your cavities considering several main household fuels and estimates a payback time for the investment. For a larger house cavity wall insulation will cost £550 and for the smaller house about £400.
|Approx % energy saving||Approx energy saving per year
||Electric (Std)||Economy 7||LPG
|Savings - 3 bed house||20%||4000 kWh||£ 172||£ 616||£ 300||£ 232||£ 172|
|Payback time with cavity wall insulation costing £ 400 (3 bed house)||2.3 years||0.6 years||1.3 years||1.7 years||2.3 years|
|Savings - 5 bed house||20%||6000 kWh||£ 258||£ 924||£ 450||£ 348||£ 258|
|Payback time with cavity wall insulation costing £ 550 (5 bed house)||2.1 years||0.6 years||1.2 years||1.6 years||2.1 years|
Is it worth doing?
Yes. This measure is on a par with insulating the loft as one of the most effective thing you can do to your house to save money and protect the environment. And like loft insulation there are grants available to many of us to completely pay for the insulation, check for grants from the warm front scheme (this is now gone), energy companies and local authorities and check with your local energy advice centre.
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