Could the UK Hold 10.6 Billion People?

> The United Kingdom’s land area is 243,610,000m2.

No, it isn't. Wolfram Alpha reports that it is 249,430 km^2. To convert from km^2 to m^2, you multiply by 1000000, not 1000.

This throws all your calculations off by a factor of 1000.

Schoolboy error.

> If every centimeter of the United Kingdom’s land had a house built on it with a floor size of 76m2, the UK could only fit 3.2million houses. The UK currently has approximately 25million houses.

If it can only fit 3.2M houses, how can there be 25M already? Math error.

Also the blog's title is "Could the UK Hold 4.1 Billion People?", not "10.6 Billion" as in the HN submission.

I wish one could downvote submissions of poor quality to negative levels.

Bigger houses with more people per house - better support to look after old people at home or keep young people there while they study.

Better flats - much better noise insulation, with energy efficiency and better local infrastructure (especially local transport), so singletons use space efficiently.