We bought a run down bog standard 3 bedroom semi in Zone 4 South London for £550k in 2017. We took out a £500k (5x earnings mortgage).
We lived in a hovel for two years that wasn't really fit for human habitation because we had no money for renovations. We did a bit of work in 2019 to make it livable - new central heating system, new bathroom, DIY IKEA kitchen, replastered and decorated.
We've just finished a major building project and the house is now a six bedroom home with a large rear kitchen/diner/living space.
That was funded by savings and £100k of additional borrowing.
The house is now probably worth between £1.1 & £1.2 million. Our mortgage is £3,300 per month (£40k per year). Council tax is £3k a year.
Now we're in danger of being snared in this envy driven 'tax the rich' bullshit for the temerity if daring to aspire to a better quality of family life.
Fuck off.
We're not rich. We've funded our home purchase and improvements with debt.
This is going to kill the building trade, because you'd have be a total moron to extend your home and get dragged into this shit.