How Much Does It Cost to Buy a Flat in W1?
The average property price in W1 London is quoted in a dozen different ways, most of them from agents' asking prices. Here is a harder number. Taking every standard Land Registry flat transaction in the W1 postcode districts dated between 1 August 2025 and 30 June 2026, there were 148 sales. The median was £1,087,500. The mean was £1,848,151, and the gap between those two figures tells you most of what you need to know about W1.
The spread, not the average
W1 is not one market. The cheapest flat that changed hands in the period went for £150,000, in Marylebone; the dearest went for £9,260,000, also in Marylebone, a few hundred metres away. Averaging those together produces a number that describes nothing.
The quartiles are more honest. A quarter of W1 flat sales were under £714,125. A quarter were over £2,290,625. The middle half sat between those, and the top tenth started at just under £4m.
| Measure | Flat price |
|---|---|
| Lowest sale | £150,000 |
| Lower quartile | £714,125 |
| Median | £1,087,500 |
| Mean | £1,848,151 |
| Upper quartile | £2,290,625 |
| Highest sale | £9,260,000 |
Where the sales actually fell
Splitting the 148 sales into price bands shows how much of W1 is reachable and how much is not.
- Under £500,000: 16 sales, 11 per cent
- £500,000 to £750,000: 23 sales, 16 per cent
- £750,000 to £1m: 30 sales, 20 per cent
- £1m to £1.5m: 25 sales, 17 per cent
- £1.5m to £2.5m: 21 sales, 14 per cent
- £2.5m to £5m: 20 sales, 14 per cent
- Over £5m: 13 sales, 9 per cent
Just under half of all W1 flat sales were under a million pounds. That is not the picture the postcode's reputation gives you, and it is the single most useful fact here for anyone assuming W1 is out of reach.
By postcode district
Postcode district is a better guide than area name, because W1 boundaries do not follow the neighbourhoods anyone talks about. These are the districts with at least ten recorded flat sales in the period.
| District | Roughly | Sales | Median |
|---|---|---|---|
| W1K | Mayfair, Grosvenor Square | 14 | £2,975,000 |
| W1G | Harley Street, Marylebone | 18 | £1,500,000 |
| W1U | Marylebone High Street | 39 | £1,196,000 |
| W1T | Fitzrovia | 23 | £950,000 |
| W1H | Marylebone, west of Baker Street | 27 | £900,000 |
| W1W | North Fitzrovia, Great Portland Street | 14 | £796,175 |
W1U carries the most transactions of any W1 district, and it also has the widest internal spread: the £150,000 sale and the £9,260,000 sale are both in it. Marylebone is where W1 is most liquid and least predictable.
Mayfair's core districts, W1J and W1K, produced only 18 flat sales between them in eleven months, which is a reminder that thin volume is part of the prime market's character. See our comparison of Mayfair versus Marylebone for what the two feel like to live in.
What the headline price does not include
Three costs reliably surprise buyers new to W1.
Service charges. A porter, a lift, communal heating and a mansion block's maintenance reserve add up. Four figures a year is normal and five figures is not unusual in prime blocks. Ask for three years of accounts, not a quoted figure.
Lease length and ground rent. Nearly every W1 flat is long leasehold, frequently on one of the great estates. A short lease depresses the price and the extension is a separate, sometimes substantial, transaction.
Stamp duty. On a £1,087,500 purchase the bill is significant before any surcharge, and higher again for an additional property or a non-resident buyer. Model it before you set a budget.
How this was worked out
The figures come from HM Land Registry Price Paid Data, filtered to flats and maisonettes, standard transactions only, in London postcodes beginning W1A, W1B, W1C, W1D, W1F, W1G, W1H, W1J, W1K, W1S, W1T, W1U or W1W, with a transaction date between 1 August 2025 and 30 June 2026. Standard transactions exclude bulk transfers, sales at other than full market value and repossessions.
One caveat worth stating: Land Registry data reflects registration, which lags completion by roughly two months, so the most recent months in any extract are incomplete and the totals here will rise slightly as more sales are registered.
More on the area in our Marylebone area guide, our Mayfair guide and living in W1. Everything else is on the W1 London homepage.
Frequently asked questions
What is the average price of a flat in W1?
Across 148 standard Land Registry flat sales in the W1 postcode districts dated between 1 August 2025 and 30 June 2026, the median was £1,087,500 and the mean £1,848,151. The mean is dragged up by a handful of very large Mayfair and Marylebone sales, so the median is the more useful number.
How much do you need for a one-bed flat in W1?
The bottom quarter of W1 flat sales came in under £714,125, and a quarter of all sales were below that. Sixteen of the 148 sales, about one in nine, were under £500,000. They are spread across Marylebone and Fitzrovia, with none at all in the Mayfair districts, and are typically small flats or shorter leases rather than anything on a prime street.
Which is the cheapest part of W1 to buy a flat?
On this data, Soho and Fitzrovia. The median flat sale was £807,500 across the Soho districts and £859,800 across Fitzrovia, against £1,138,750 in Marylebone and £3,030,000 in Mayfair. Soho's figure rests on only six sales, so treat it as indicative.
How much more expensive is Mayfair than the rest of W1?
The Mayfair median of £3,030,000 is 2.7 times the Marylebone figure and 3.5 times Fitzrovia's. The top end is split, though: of the 13 flat sales above £5m, five were in W1U and two in W1G, both Marylebone districts, against six across the Mayfair districts.
Are W1 flats mostly leasehold?
Almost all of them. Central London flats are typically long leasehold, often on a great estate such as Grosvenor, Portman, Howard de Walden or the Crown Estate. Lease length materially affects price, which is one reason the same size of flat can sell for very different sums on the same street.
Does the Land Registry data include new builds?
Yes, though W1 has few. These figures cover standard transactions only, which excludes bulk portfolio transfers, buy-to-lets sold at non-market prices and repossessions, so they are closer to what an ordinary buyer paid than a headline agent average.
Sources
- HM Land Registry Price Paid Data, flats and maisonettes, standard transactions, W1 postcode districts, sales dated 1 August 2025 to 30 June 2026, analysed by W1 London: landregistry.data.gov.uk
Price Paid figures were pulled on 20 August 2026. Land Registry data lags registration by around two months, so the most recent months are incomplete.