W1U postcode district — Marylebone, Westminster

The W1U postcode district in London sits across Marylebone, spanning the local authority areas of Westminster. It groups thousands of unit postcodes used for addressing and is a practical geography for comparing marylebone property market activity with neighbouring districts. In the 12 months to 31 March 2026, recorded paid sales show an average sold price around £2,354,126 across 23 transactions in the district. On a year-on-year basis, the average moved about up 34.1% compared with the previous 12 months. The busiest segment was flat / maisonette, with 19 sales in that period—useful context when you compare house prices in W1U across terraces, flats and houses. Westminster sold prices in the official Price Paid extract reflect completions (not asking prices), so they’re a solid base for research, desk-based due diligence and area IQ-style comparisons. We surface the latest-sale pattern per postcode where a standard paid sale exists in-window.