W1G postcode district — Marylebone, Westminster and Islington

The W1G postcode district in London sits across Marylebone, spanning the local authority areas of Westminster and Islington. 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 £1,758,594 across 8 transactions in the district. On a year-on-year basis, the average moved about down 14.9% compared with the previous 12 months. The busiest segment was flat / maisonette, with 7 sales in that period—useful context when you compare house prices in W1G across terraces, flats and houses. Westminster and Islington 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.