The most expensive postcodes in England and Wales (2026)

In 2025 the typical home in SW1X — the slice of central London that covers Belgravia and Knightsbridge — changed hands for a median of £2,445,000, according to HM Land Registry Price Paid Data. That is more than eight times the £295,000 national median recorded across the 737,746 standard residential sales registered for the year.

SW1X tops a league table of 20 postcode districts where buying the median home costs north of £850,000. Look closely and the list splits into two very different property markets sitting side by side: the prime central London flat, and the detached-house belt of Surrey, Buckinghamshire and Hertfordshire.

A note on scope. This ranking is built from HM Land Registry Price Paid Data, which covers England and Wales; Scotland and Northern Ireland keep separate property registers and are not included. We rank by postcode district — the outward half of the code, such as SW1X or KT10 — using the median sale price of standard residential transactions (houses and flats). The median is far more robust than the average to the occasional very large or unusual registration. Every district shown recorded at least 50 sales in 2025, drawn from 2,089 districts that cleared that threshold.

The 20 most expensive postcode districts

Source: HM Land Registry Price Paid Data, 2025 standard residential transactions (detached, semi-detached, terraced and flat). Figures are district medians, not valuations of any individual home. Data fetched 21 June 2026.

Every one of the 20 dearest districts is in London or its immediate commuter belt — none is more than roughly 25 miles from Charing Cross. A handful of prime districts straddle two boroughs (Belgravia, for instance, spans Westminster and Kensington & Chelsea); the authority shown is where most 2025 sales were recorded.

Two markets, one league table

The "main type" column tells the structural story. The central London districts are overwhelmingly flats: 84% of SW1X's 2025 sales were flats, 82% in South Kensington's SW7, and 99% in EC2Y — the Barbican estate. These are not, for the most part, the glass towers of newer riverside schemes. They are period mansion blocks and stucco-fronted Georgian and Victorian conversions, where a "flat" can mean a whole floor of a Belgravia terrace.

The commuter-belt districts are the mirror image: detached houses. In KT24 (the Horsleys, west of Guildford) 68% of sales were detached; in Gerrards Cross's SL9, 56%; in Beaconsfield's HP9, 50%. The two Richmond entries — Barnes (SW13) and Mortlake & East Sheen (SW14) — are the terrace exceptions, reflecting their dense Victorian streets near the river.

So the same price band buys two completely different things: a lateral flat in a stuccoed central terrace, or a detached house with a garden 40 minutes down the railway.

Dearest to buy, cheapest to run

Here the data does something counter-intuitive. Several of the most expensive places in the country to buy are among the cheapest to run on council tax.

Source: gov.uk council tax statistics, 2026-27 Band D levels (London figures include the Greater London Authority precept).

Belgravia's SW1W has a median sale price of £1,460,000, yet it sits in Westminster, whose 2026-27 Band D bill of £1,049.55 is the second-lowest of any authority in England — behind only neighbouring Wandsworth (£1,028.21). The Barbican (EC2Y) sits in the City of London at £1,329.56. Knightsbridge and Kensington pay £1,666.65.

Travel out to the commuter belt and the bill more than doubles. Esher and Cobham fall in Elmbridge, where Band D is £2,557.75 — about 2.4 times the Westminster figure — even though their median sale prices (£900,000 and £885,000) are a fraction of Belgravia's. Beaconsfield and Gerrards Cross (Buckinghamshire) pay £2,526.58; the Horsleys (Guildford) £2,547.30.

Why the inversion? Council tax is set by each authority to fund local services and is only loosely linked to property values: the bands themselves still rest on 1991 valuations, and the Band D charge is a flat per-authority figure rather than a percentage of price. Central London boroughs have historically set low Band D rates, helped by large commercial tax bases. The upshot is that, on council tax alone, a multi-million-pound flat in Belgravia can cost less each year than a £900,000 house an hour down the A3.

What it costs to buy at the top

Stamp Duty Land Tax turns sharply progressive at these prices, because the top slabs — 10% on the slice from £925,000 to £1.5m, and 12% above £1.5m — only bite on expensive homes (HMRC, 2026).

Source: HMRC residential SDLT rates, England and Northern Ireland, 2026.

At the national median, stamp duty on a main home is £4,750. At SW1X's £2,445,000 median it is £207,150 — an effective 8.47%, because £945,000 of the price falls in the 12% band. Those figures are for someone buying a single main residence. Second homes and buy-to-let purchases carry a 5% surcharge on top, and buyers who are not UK resident a further 2%, so the bill on an additional property at these levels runs comfortably into six figures. The current rates are set out on gov.uk. This is general information, not advice; a conveyancer confirms the exact figure on completion.

A footnote on running costs

A high price does not buy energy efficiency. Across the eight prime central London districts in the table, just 26.3% of the 21,534 domestic Energy Performance Certificates on record are rated band C or above — slightly lower than the commuter-belt cluster (33.9%). The reason is age of stock: prime central London is dominated by Victorian and Georgian conversions that are difficult and costly to insulate, glaze and ventilate to modern standards. EPC running-cost figures rest on standardised modelling assumptions and are best read as directional rather than as a current energy bill.

See the figures for any street

Homecost shows the all-in cost of a property — mortgage at the current Bank of England quoted rate, council tax, energy and stamp duty — for any address. Look up the true cost of any Westminster postcode, or, at the other end of the market, see the postcodes where £100,000 buys the average home.

For more on the capital, read the most expensive London postcodes and our breakdown of inner London's flat market. For a full line-by-line cost at this level, see the true cost of buying a £1 million home. More ranked data pieces sit in the market analysis section, and the open datasets behind these figures are described across the Homecost blog.

Based on 737,746 HM Land Registry standard residential transactions in 2025 and 2026-27 council tax Band D levels published by gov.uk. This is general information, not advice. Speak to a qualified adviser before acting.