Work to renew either a façade or roof undertaken after 1st January 2017 must include improving the insulation. There are minimum limits to the works (eg 50% of a roof renewed) and exemptions can be obtained for architectural or aesthetic reasons - but must have an expert's certificate.
It makes sense that if you are making your loft, or a garage (over 5m2) into living space that you would include insulation, but now it is mandatory. Tax credits and other fiscal incentives exist and the scheme includes all buildings, whether private dwellings or commercial premises.
Readers may have been subjected to the usual cold calls insisting that it is obligatory to renew insulation, but it is only as part of a bigger improvement project, so don't be conned.
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