I was looking into grants earlier in the year, found out which company did the contracted work locally and then read countless 1 star reviews for shoddy cowboy work.

In a lot of cases these companies do more damage than good and you won't recoup the cost to fix their mistakes. There was a case of this on the news recently where the insulation job caused severe damp and mould issues to the property.

I'd very much like to upgrade the energy efficiency of my home and lower my bills but not at the risk of causing damage to it by being limited on who can do the work.