> Another major problem is the quality of building in the UK, mainly driven by a lack of tradespeople, and simply not having the skills to install to the qualit

> Another major problem is the quality of building in the UK, mainly driven by a lack of tradespeople, and simply not having the skills to install to the quality levels required by thermally efficient houses like installing a membrane with zero holes in it, using the correct tapes, designing, installing and maintaining heat pumpes and various other things. It's an incentive and delegation problem. I'm in the US, and have been through three large renovations to family homes, and the trades I've worked were (nearly) all HIGHLY skilled, but had zero incentive to exceed energy efficiency goals required by code. The small business contractor needs to complete your project, get paid, and move on to the next. The best ones don't have any extra time - they're prospecting clients and building estimates for the next big project.