Surging house prices mean that £12,000 would buy just one square metre of a property in Kensington and Chelsea, according to a report.
The London borough was named by Halifax as Britain's most expensive place for property on a square metre basis, with the average square metre of a home there setting a buyer back £11,635.
One square metre of a property in Kensington and Chelsea costs nearly six times the national average of £2,033.
The borough is the only area in Britain with an average price above £10,000 per square metre, with Westminster having the next highest price, at £9,571.
All of the top 10 most expensive areas were in London, with Camden, Hammersmith and Fulham, Islington, Wandsworth and Hackney also on the list.
Outside southern England, Altrincham in Cheshire is the most expensive town, with properties costing around £2,446 per square metre.
Solihull, Warwick, Leamington Spa, Edinburgh, Aberdeen, Harrogate and York were also among the most expensive towns for property outside London on a square metre basis.
Home buyers looking to buy more space with their cash might want to consider Aberdare or Merthyr Tydfil in South Wales, Wishaw or Airdrie in Scotland, or head for Accrington or Blackpool in Lancashire, the research suggests.
Compare mortgage rates
Aberdare was found to be Britain's cheapest town for property, with one square metre costing £910 on average.
Halifax said that across the country, house prices per square metre have surged by 18% since 2010.
Greater London has experienced substantially faster growth than elsewhere in Britain with an average increase of 45%. Some London boroughs have seen particularly large jumps in the price of property per metre squared since 2010, with Hackney recording a 71% increase and Southwark recording an uplift of 70%.
Compare mortgage rates
Halifax made its calculations by looking at average house prices across 331 towns, using its database, and dividing these by typical property sizes, to get the average price per metre squared.
Craig McKinlay, mortgages director at Halifax, said: "House price per square metre is a useful measure for house price comparison because it helps to adjust for differences in the size and type of properties between locations.
"Parts of central London are substantially more expensive than anywhere else in the country. Nonetheless, there are a number of notable pockets outside the south of England where property prices are also high price per square metre. There has been a clear widening in the gap between southern England, particularly London, and the rest of the country over the past 20 years – a trend that has continued during the last five years."
Here are the 10 most expensive areas per square metre in Britain, according to Halifax, with the average price per square metre:
1. Kensington and Chelsea, London, £11,635
2. Westminster, London, £9,571
3. Camden, London, £8,829
4. Hammersmith and Fulham, London, £8,306
5. Islington, London, £7,399
6. Wandsworth, London, £6,761
7. Richmond upon Thames, London, £6,265
8. Hackney, London, £6,196
9. Tower Hamlets, London, £5,980
10. Southwark, London, £5,962
Here are the 10 most expensive areas per square metre in Britain outside southern England, with the average price per square metre:
1. Altrincham, North West, £2,446
2. Solihull, West Midlands, £2,367
3. Warwick, West Midlands, £2,363
4. Leamington Spa, West Midlands, £2,353
5. Edinburgh, Scotland, £2,297
6. Aberdeen, Scotland, £2,281
7. Harrogate, Yorkshire and the Humber, £2,196
8. Sale, North West, £2,138
9. Cheadle, North West, £2,033
10. York, Yorkshire and the Humber, £2,024
Here are the 10 least expensive areas per square metre in Britain, with the average price per square metre:
1. Aberdare, Wales, £910
2. Wishaw, Scotland, £926
3. Merthyr Tydfil, Wales, £967
4. Accrington, North West, £990
5. Airdrie, Scotland, £998
=6. Greenock, Scotland, £1,004
=6. Coatbridge, Scotland, £1,004
8. Neath, Wales, £1,005
9. Scunthorpe, Yorkshire and the Humber, £1,022
10. Blackpool, North West, £1,052
And here are average property prices per square metre on a regional basis and the percentage increase in the prices since 2010:
:: London, £4,426, 45%
:: South East, £2,681, 22%
:: East Anglia, 1,835, 17%
:: East Midlands, £1,458, 12%
:: West Midlands, £1,602, 12%
:: South West, 1,959, 10%
:: Yorkshire and the Humber, £1,410, 9%
:: North West, £1,434, 8%
:: Wales, £1,277, 7%
:: Scotland, £1,490, 5%
:: North, £1,234, 3%