For most homes, loft insulation starts from around £250 and rises with the size of the loft, the material you choose and how easy the access is. A straightforward mineral-wool top-up in a standard semi sits at the lower end; a foil-insulated loft room or a job that includes boarding will cost more. As a rough guide, a full insulation install for a typical three-bedroom home tends to fall in the £500–£900 range, with top-ups cheaper.
Because an uninsulated loft can lose roughly a quarter of a home's heat, upgrading to the recommended 270mm depth often pays for itself through lower energy bills within a few years — and keeps saving long after. The Energy Saving Trust puts typical annual savings in the low hundreds of pounds, depending on the property. Your free assessment will give you a realistic figure for your own home.
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