Cavity wall insulation is a good way to significantly reduce the amount of energy you need to heat your home, and reduce carbon emissions.
The average house could reduce heating costs by a third.
Between 2002 and 2005 around 800,000 households installed cavity wall insulation. Saving an estimated 400,000 tonnes of CO2 emissions.

Most conventional housing built after 1920 is of brick cavity wall construction. This means that the outer walls are of two brick constuction with
an air gap in between them. If your home has this unfilled gap then a large proportion of your heating bill is for heating up the great outdoors.
Filling the gap between the two walls with an insulating material reduces the amount of heat escaping through the walls, so your house heats
up quicker and you can reduce your energy consumption accordingly.

Around a third of all the heat lost in an un-insulated home is lost through the walls. If you have cavity walls, insulating between them can make
a graet deal of difference. The typical payback period for having cavity wall insulation is about three years, and just as importantly the average
reduction in CO2 emissions is about 1 tonne per household year.

If all the houses with unfilled cavity walls had them filled, the energy saved could heat 1.7 million homes each year.

Cavity wall insulation is injected into the cavity from outside the home, it takes typically two to three hours to insulate a three bed semi and
typically costs under £500.

Source of information is: The Energy Saving Trust january 2007.

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