The gap between a semi-detached house and a detached one is the single biggest step on the English housing ladder — and in a handful of places it is less a step than a leap. Across England and Wales in 2025, the median detached home sold for at least twice the median semi in just 26 of 1,668 postcode districts with enough recorded sales to measure reliably, according to HM Land Registry Price Paid data (fetched 19 August 2026).
Nationally, the gap is far gentler. A typical detached house changed hands for £420,000 last year against £275,000 for a semi — a premium of £145,000, or 52.7%. Terraced homes and flats sat level with each other on a £240,000 median. So a full doubling is rare: it shows up in fewer than one district in sixty.
What makes these 26 districts interesting is that they do not share a price bracket. They split cleanly into two camps at opposite ends of the ladder — and the reason a detached costs double a semi is completely different in each.
The 26 districts where a detached cost 2×+ a semi (2025)
| District | Area | Median semi | Median detached | Detached premium |
|---|---|---|---|---|
| NW2 | Cricklewood / Willesden, London | £810,000 | £2,600,000 | +221.0% |
| S65 | Rotherham | £160,000 | £397,000 | +148.4% |
| SW19 | Wimbledon, London | £1,330,000 | £3,160,000 | +137.6% |
| DL13 | Weardale, Co. Durham | £145,000 | £334,000 | +130.3% |
| SO17 | Highfield, Southampton | £335,000 | £750,000 | +123.9% |
| SW20 | Raynes Park, London | £973,000 | £2,150,000 | +121.1% |
| CH42 | Birkenhead, Wirral | £195,000 | £430,000 | +120.5% |
| SE3 | Blackheath, London | £700,000 | £1,525,000 | +117.9% |
| HD2 | Huddersfield | £191,000 | £415,000 | +117.0% |
| WD7 | Radlett, Hertfordshire | £665,000 | £1,435,000 | +115.8% |
| NE37 | Washington, Tyne & Wear | £155,000 | £333,000 | +114.5% |
| SL2 | Slough / Stoke Poges | £495,000 | £1,053,000 | +112.6% |
| WA14 | Altrincham, Gtr Manchester | £437,000 | £925,000 | +111.5% |
| TS4 | Middlesbrough | £135,000 | £285,000 | +111.1% |
| HG2 | Harrogate | £354,000 | £740,000 | +109.2% |
| SL5 | Ascot, Berkshire | £553,000 | £1,155,000 | +109.0% |
| SR8 | Peterlee, Co. Durham | £114,000 | £238,000 | +109.0% |
| NE65 | Morpeth / Rothbury, Northumberland | £213,000 | £435,000 | +104.7% |
| TS22 | Billingham / Wynyard | £190,000 | £388,000 | +104.5% |
| NE11 | Gateshead (Team Valley) | £162,000 | £330,000 | +104.3% |
| KT11 | Cobham, Surrey | £698,000 | £1,423,000 | +103.9% |
| RH5 | Dorking, Surrey | £493,000 | £993,000 | +101.5% |
| B45 | Rednal / Rubery, Birmingham | £270,000 | £543,000 | +100.9% |
| DY9 | Stourbridge / Hagley | £279,000 | £560,000 | +100.7% |
| MK5 | Shenley, Milton Keynes | £313,000 | £628,000 | +100.6% |
| SR5 | Sunderland (north/west) | £125,000 | £250,000 | +100.0% |
Medians rounded to the nearest £1,000; ranked by the detached-over-semi premium. Every row clears a minimum-sample guard of at least 30 recorded semi sales and 15 detached sales in 2025.
Two housing markets, one ratio
Thirteen of the 26 districts have a median semi under £300,000; ten have a median semi above £400,000. That bimodal split is the whole story.
At the top sit the prime pockets of London and the commuter counties: Cricklewood and Willesden (NW2), Wimbledon (SW19), Raynes Park (SW20) and Blackheath (SE3), then Radlett (WD7), Ascot (SL5), Cobham (KT11) and Dorking (RH5) in the Home Counties, and Altrincham (WA14) in Greater Manchester's leafy south. Here a semi is already a substantial six- or seven-figure house — but a detached home on its own plot is a genuinely scarce asset, and the price steps up accordingly. In Wimbledon the median semi sold for £1,330,000 in 2025; the median detached, £3,160,000.
At the bottom sits a very different geography — the North East above all. Weardale (DL13), Washington (NE37), Middlesbrough (TS4), Peterlee (SR8), Gateshead (NE11), Billingham (TS22) and Sunderland (SR5) all appear, alongside Rotherham (S65) and Huddersfield (HD2) in Yorkshire, Birkenhead (CH42) on the Wirral, and Rednal (B45) and Stourbridge (DY9) in the West Midlands. Here the mechanism reverses. The semi is the entry-level family home, priced close to the local terrace floor — £114,000 in Peterlee, £135,000 in Middlesbrough, £145,000 in Weardale. A detached house is a much larger or newer property, often on an estate at the edge of town, so the ratio doubles even though the cash gap is modest by London standards.
Why the ratio, not the cash gap, tells the story
In pounds the two camps look nothing alike. The step from a Wimbledon semi to a Wimbledon detached is about £1.83 million; in Peterlee it is £124,000. But measured against what a family already owns, both are the same move — roughly a doubling.
For a household trading up within its own area, that ratio is what counts: selling the semi funds only half of the detached, whatever the postcode. It also explains why the "detached premium" is so often misread. Nationally it is a manageable 53%; the 2× districts are the exception, not the rule, and they cluster at the extremes of the price distribution rather than in the middle.
Where a doubling does not happen
Across most of England and Wales, trading up from a semi to a detached is a far smaller move. The median premium across all 1,668 robust districts is roughly 49%, and 138 districts show a premium of 75% or more. Below that the step narrows sharply: in many Midlands and northern towns a detached costs 30–45% more than a semi, not 100%.
How we measured it
Every figure above is a median of actual completed sales recorded by HM Land Registry in the 2025 calendar year, restricted to standard residential transactions (Price Paid category A). Sales were grouped by postcode district and property type; we took the median for semis and for detached homes separately, then expressed the detached figure as a premium over the semi.
Small samples can throw up misleading extremes — a single large sale can distort a thin market — so we excluded any district without at least 30 semi sales and 15 detached sales in the year. That guard matters: apparent "inversions", where a semi seems to outsell a detached, disappear entirely once the detached sample reaches 15 (see whether a semi ever outprices a detached house). These are paid prices, not valuations — Homecost reports what buyers actually paid, never what any individual home is worth.
See the true cost for any street
Price is only the start. Council tax, energy and the mortgage at today's Bank of England quoted rate all shape what a home actually costs to live in. Enter any postcode into the Homecost true-cost tool to see the all-in monthly cost of every property on a street — semi or detached.
For the wider picture, compare price per square foot across UK cities, read the full breakdown of average house prices in Sheffield and Leeds, or browse more market analysis. This analysis draws on more than 400,000 Land Registry semi and detached transactions from 2025; see how the numbers are built across the Homecost guides.
This is general information, not financial advice. Speak to a qualified adviser before acting.