It honestly baffles me that America has them. The US (I'm a Brit) is meant to be about individualism, personal rights, property rights etc. But these are all the bad bits of communism (except for actually killing people).

The only logical reason for this I can see is people being terrified they'll lose 50k because their neighbours paint their house black and let the lawn turn to scrub.

How does it work in the UK? Many areas I visited in the UK have very uniform looking houses (all brick walls, nothing really sticking out, very pleasing to the eye). I assume there must be some strict rules to follow...

In the UK, there are very tight laws for changing your house. But they're set nationally. I think they're ridiculous. It's very hard to get permission to build something in a residential area (with some tightly defined exceptions for 1 story extensions not visible from the front or sheds etc).

Weirdly you can do what you want outside of that. So I can't build a turret on my house. But I could paint it pink and replace my front lawn with cactuses or cover it in junk cars.

No one can make me do anything to make it look nice. But I'm stopped from doing much to make it bigger or look better than the neighbours.

There are "listed" buildings (where you cannot change almost anything). But they're rare and you know you're buying Shakespeares cottage and gave to keep it exactly as is. And in a lot of areas you need permission to cut down trees over a certain size.

HOAs are typically planned ahead of time by the investors/builders/etc. as part of a planned neighborhood. This is entirely imposed by capitalists. Another classic "communism is when capitalism" #6432368.