notauniquename you could look at Belgium, and say they have a greater population density.Belgium 10 million population, 11672, 856 per square mile. to which I'd say, take out the Lochs and lakes and hills and mountains (e.g. make it comparable to Belgium)and you get:
England 53 million 50,337, square miles 1052 people per square mile.
Maybe you don't buy that well land is more expensive argument?
How about not being able to get a mortgage on a small piece of land?
That it's difficult enough to save £25k for a 10% deposit of an average priced house in the UK, and that raising £50k (or more) - where you can't have a mortgage on land like that is all but impossible, and then there is the added hassle of getting planning permission, paying architects. and of course buying the materials, and that's before a single "workman" has set foot on the site of your new house!
I don't think its as simple as that. I suspect the difference is more about the UK planning authorities and policies being set up to favour big developers (zoning) and encouraging those companies to buy up land banks and sit on them until they get pp. Then they build massive, space-wasting, relatively expensive housing estates, the population aspires to perfect looking concrete blocks that they don't have to do anything to improve, and expectations are managed accordingly.
Of course individuals can't compete with a big developer with a massive budget. And when those individuals have grown up in a new build in a development, they're hardly likely to want to self build.
Belgium is developed along arterial routes, but its farmland is at least as well protected as in the UK, so I would say that's the main difference - the more flexible planning regime. Germany hasn't got that significantly different a population density to the UK, so again the difference must be due to other factors. In both those countries, building your own home, often one in a rural area which would be classified as a second home until you can retire there, is not so unusual as here.
CactusAnnie once you've come off your tangent and stopped accusing people of things they haven't said, maybe you will admit there is something inherently wrong with wanting to deprive individuals of their own property which they lawfully own.