There are schemes in the UK which will allow you to add these costs to your energy bill (repaid over time with interest). This seems to me like the "best" solut

There are schemes in the UK which will allow you to add these costs to your energy bill (repaid over time with interest). This seems to me like the "best" solution - it puts the costs and benefits together, stays with the house and the bad debt risk is significantly mitigated without needing to worry about enforcing security over a physical asset. Not sure why it's not better known or widespread.