The housing market in the SE is utterly fucked, to be honest i think the only solution is a massive building social housing push. There is a horrific lack of council housing in my area meaning that the private rental houses are so in demand its unreal. Especially small, affordable ones.
I own a teeny studio flat. 5 years ago i advertised for a new tenant and i took the advert down after 2 hours as I'd already had 40+ messages expressing interest.
My flat will be nearly impossible to get to a C - things like ground source heatpumps and solar panels are a no go because its a flat, and i don't own the building. It already has double glazing, etc. I can upgrade the heating relatively easily with the tenant in situ but adding floor insulation will be impossible whilst she is living there and has it filled with her furniture.
So that means i either hope she moves out before 2028 (unlikely as shes very settled and now pays under market rent), or i end up giving her notice and once the flat is empty i can do all the various bits of work to try and get it up to the magic C rating.
So what benefit is that to my tenant? She'll have to go through the upheaval of moving, finding a new place, etc in an area where its already super difficult to find anywhere and where rental prices have rocketed.
And what if despite doing all the things recommended i cant get it up to a C? Well, the plan has always been that once dc reaches late teens/early 20s they could live there rent free, just covering bills. So worse case scenario is that flat sits empty (or dh uses it as a wfh office space) for a couple of years till dc want to leave home and move in.
So, in an area where there's already a massive shortage of houses/flats these rules may mean that a flat ends up sitting unused for a few years till my dc grow up.
Its easy to blame landlords, but actually everyone should be screaming at the government for not building enough houses/flats. The only reason rents are so darn high is that demand far outstrips supply.