Effective insulation is perhaps the most important aspect of controlling your heating bills.  Insulate walls, roof and floors of your home to retain as much heat as possible.


Loft insulation is often the easiest aspect to tackle – a 300mm-deep layer of mineral wool insulation will achieve a good standard of heat retention.  You should, however, take care not to cover recessed light fittings, cables or block ventilation gaps at the eaves.  Finally, don’t forget to insulate your loft hatch and put lagging on your pipes whilst you are at it.

Most homes built in the last hundred years will be built with cavity walls. These usually have an outer brick skin and an inner skin of brick or concrete block.  Generally speaking it is a good idea to fill the cavities with insulation. This acts like a fleece to trap air and retain warmth.  In some cases this may not be a good idea, for example if you have walls which are very exposed to rain and wind, or where the cavity is too narrow to fill.  In these cases insulation fitted to the inside or outside of the walls may be a suitable solution.

Insulating floors is trickier unless you are taking up floor-boards anyway. Carpets or wood flooring provides some insulation.

Costs and savings

Loft and cavity wall insulation typically costs between £200 and £500.  External/internal wall insulation is much more expensive at around £5000 upwards depending on the size of your property.   Grants are sometimes available.


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