BBC website on fitting Cavity wall insulation click here

The Cavity Insulation Guarantee Agency
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• Most people know that 25 per cent of an un-insulated home's heat is lost through the roof, but a further third of all the heat lost is through the walls. British Gas estimates that £1 in every £4 spent on heating is lost because of poor insulation[1][1]. A hassle-free way to save energy and prevent money evaporating into thin air is to stop this heat escaping with cavity wall insulation
• Cavity wall insulation pays for itself in around two years, and it will typically save 15 per cent - or £115 - a year on your home's fuel bills... year on year!
• Cavity wall insulation can also reduce your family's carbon footprint by around 610kg a year. If every UK household suitable for cavity wall insulation installed it, we'd save a staggering £690 million and around 4 million tonnes of CO2 every year. That's enough to fill 790,000 hot air balloons!
• A well-insulated house keeps the warmth exactly where you want it in the winter and the cool air exactly where you want it in summer: indoors. This means that the heating doesn't need to be on as much, or as high, during the colder months, and homeowners can go easy on air-conditioning and fans in the hotter months
• Cavity wall insulation needs to be installed by a professional. Check that an installer is registered with the Cavity Insulation Guarantee Agency (which will also guarantee any work carried out for an impressive 25 years) and has signed up to a code of professional practice
• Cavity wall insulation can be installed in a single day and isn't disruptive or damaging to a house or garden. It is installed by drilling a series of small holes (just under one inch each in diameter) in the mortar between the bricks of a house, before blowing insulation through the holes until the gap or ‘cavity' between the external and internal wall is completely filled. The holes will then be filled with matching mortar- no one will know a change has been made!
• The cost to have cavity wall insulation installed has never been lower, as it's subsidised by the Government which aims to cut emissions from the UK's homes by 29% by 2020.
• Subsidies can also be sought from the major energy suppliers, as they have a commitment to improving home energy efficiency under the Government's CERT scheme.
• The best way to find out if a house is suitable for cavity wall insulation is to find out how old it is. Cavity wall insulation is a great energy saving solution for properties built after 1920. If a home is older than this it probably won't have cavity walls.
• If a home was built in the last ten years, it is likely that the cavity is already insulated, for which the owner should have been given a certificate when they moved in.