From 1st December, under the Northants Warm Homes Insulation Scheme, cavity wall insulation and loft insulation where there is less than 60mm existing thickness  remain free to homeowners and private tenants in Northamptonshire who are over 70 or in receipt of qualifying benefits.  Loft top-ups will cost £149.  For other homeowners and private sector tenants, cavity wall and loft  insulation will cost £149.  All these prices are subject to survey.  For further information please call the Hotline on 0845 872 7417.