Net zero retrofit costs will be unmanageable for most homeowners, Citizens Advice has warned.

The average cost of measures such as loft insulation and heat pumps will be just under £15,000 per household, the charity has estimated, a figure it said is out of reach of most households.

The Government wants nearly 17 million homes to improve their energy efficiency by 2035 with measures such as cavity wall insulation or triple glazing.

It also wants 600,000 homes to install heat pumps annually from 2028, with most homes on the technology by 2050 as part of its net zero plans.

But Citizens Advice has warned that half of households have savings of less than £10,000, and more than one in 10 have no savings at all.