I'd be surprised if it was genuinely because the building's listed, it's usually just that the landlord doesn't want to make the investment (and the market does

I'd be surprised if it was genuinely because the building's listed, it's usually just that the landlord doesn't want to make the investment (and the market doesn't demand it). Sadly, until the law requires rentals attain a certain level of efficiency, the same way you need something like a gas safety certificate, I can't see it changing. And apparently the Green Deal was a failure - https://www.theguardian.com/environment/2016/apr/14/green-deal-scheme-did-not-deliver-energy-savings-audit-finds https://www.theguardian.com/environment/2016/apr/14/green-de....