EC4Y postcode district — Castle Baynard, Westminster, Islington and City Of London

The EC4Y postcode district in London sits across Castle Baynard, spanning the local authority areas of Westminster, Islington and City Of London. It groups thousands of unit postcodes used for addressing and is a practical geography for comparing castle baynard property market activity with neighbouring districts. In the 12 months to 27 February 2026, recorded paid sales show an average sold price around £870,000 across 1 transactions in the district. On a year-on-year basis, the average moved about down 17.2% compared with the previous 12 months. The busiest segment was flat / maisonette, with 1 sales in that period—useful context when you compare house prices in EC4Y across terraces, flats and houses. Westminster, Islington and City Of London 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.