Just insulating your cavity walls could save you up to £135* a year on your fuel bills and 560kg of CO2.
Cavity wall insulation will help to create an even temperature around your home, help to prevent condensation on the walls and ceilings and can also help to keep your home cooler during summer hot spells.
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Prices quoted are for all homeowners, residential landlords and private tenants:
Cavity Wall Insulation |
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| Property type | Maximum Meterage | Typical Price | Price you pay with Tesco* |
| 1 bed flat | 50 m2 | £347 | FREE |
| 3 bed mid-terrace house | 55 m2 | £360 | FREE |
| 2 bed detached bungalow | 95 m2 | £527 | FREE |
| 3 bed semi-detached house | 95 m2 | £323 | FREE |
| 4 bed detached house | 140 m2 | £740 | FREE |
The main insulation materials used are glass or mineral fibre that is chopped up and blown into the cavities.
Some installers may also offer bonded bead (white polystyrene beads), particularly in cases where glass or mineral fibre is not suitable.
All systems have been tested, assessed and approved by the British Board of Agrément or the British Standards Institution. The material is guaranteed for 25 years against any defects. (Guarantees are provided by the Cavity Insulation Guarantee Agency - CIGA).

A series of small holes will be drilled into the external walls of your property.
The insulation material is blown via a nozzle through the small holes into your wall cavities.
Step 3
Once the filling process is complete the installers will re-mortar and finish the small holes making every effort to match your existing walls as far as reasonably practicable.
If you have any airbricks or air vents in your external walls the installers will ensure that they are sleeved to maintain their operation. Where they are not sleeved, a new sleeved air brick/vent will be installed. Redundant air bricks/vents will be sealed to prevent water ingress.
If you have any gas or solid fuelled appliances in your property the installer will check the safe operation of these appliances after the cavity wall insulation is installed.
Once all of the work is complete the installers will sweep up surplus debris.