Ever wondered what it actually costs to live in London’s poshest postcodes?
We’re not talking about your average London flat here.
We’re talking about streets where the typical home sells for several million pounds, and the odd sale tops £30 million.
I’ve pulled the latest HM Land Registry data for every sale registered in 2025 to work out exactly where the most expensive postcodes in the capital are. And honestly, some of these numbers are wild.
One thing jumps straight out. The prime market has reshuffled. Mayfair is back on top, and several of last year’s leaders have slipped right down the table.
Here’s everything you need to know about London’s most expensive postcodes right now.
1. W1K (Mayfair - Grosvenor Square & Park Lane)
The average price in 2025 – £5,796,388
Property price range – £850,000 to £17,500,000
The most expensive postcode in London, and it isn’t close. W1K covers the heart of Mayfair around Grosvenor Square, Mount Street and Park Lane, where even the typical home changes hands for more than £5 million.
2. SW1X (Knightsbridge & Belgravia)
The average price in 2025 – £3,188,525
Property price range – £250,000 to £34,000,000
Home to Harrods and One Hyde Park. The single biggest London sale in our data landed here at £34 million.
3. SW1W (Belgravia & Pimlico)
The average price in 2025 – £2,667,804
Property price range – £195,000 to £13,750,000
The grand white-stucco terraces and garden squares of Belgravia, running south into Pimlico towards the river.
4. W1U (Marylebone)
The average price in 2025 – £2,644,498
Property price range – £150,000 to £15,150,000
Village in the city. Marylebone is all boutique shops and handsome Georgian townhouses, tucked just north of Oxford Street.
5. W8 (Kensington & Holland Park)
The average price in 2025 – £2,492,337
Property price range – £325,000 to £14,144,900
Kensington Palace territory. Leafy, embassy-lined and one of the most consistently in-demand corners of the city.
6. W1G (Marylebone - Harley Street)
The average price in 2025 – £2,375,004
Property price range – £298,000 to £7,600,000
The Harley Street medical district, where period consulting rooms sit alongside some seriously pricey flats.
7. SW7 (South Kensington)
The average price in 2025 – £2,340,595
Property price range – £274,000 to £15,100,000
Museum land. The V&A, the Natural History Museum and Imperial College are all on the doorstep, ringed by white-stucco mansions.
8. NW8 (St John's Wood)
The average price in 2025 – £2,295,868
Property price range – £200,000 to £53,000,000
Home of Lord’s and Abbey Road. One sale here reached £53 million, the highest single price anywhere in our top 10.
9. SW3 (Chelsea)
The average price in 2025 – £2,281,997
Property price range – £195,000 to £24,500,000
The King’s Road, Chelsea Green and some of the prettiest streets in London. Old money with a creative streak.
10. W11 (Notting Hill & Holland Park)
The average price in 2025 – £2,183,437
Property price range – £250,000 to £41,000,000
Portobello Road, pastel townhouses and the famous Notting Hill set. One home here changed hands for £41 million in 2025.
The figures above are the average (mean) sold price for every standard residential sale recorded by HM Land Registry in each postcode district during 2025, with the price range showing the cheapest and most expensive sale in that postcode that year. Ultra-prime postcodes see relatively few sales, so these averages can move sharply from year to year. Data accessed June 2026.
Final Thoughts
So there you have it.
These are the most expensive postcodes in London right now.
The gap between the cheapest and most expensive homes in these areas is staggering. You could pick up a flat in Knightsbridge for around £250,000, while your neighbour might have paid £34 million for theirs. Same postcode, very different budgets.
What’s also clear is that the prime market has cooled. Average London prices slipped over the past year, and several postcodes that topped the table on 2024 figures, including Westminster’s W1B, have dropped right down. Mayfair, Knightsbridge and Belgravia still rule the roost, but the eye-watering peaks of a couple of years ago have softened.
Curious how your salary stacks up against London living costs?
Take a look at our post on what’s a good salary in London to see where you stand.
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Disclaimer: Content on this page is for informational purposes and does not constitute financial advice. Always do your own research before making a financially related decision.
