SE21 postcode district — West Dulwich, Southwark and Lambeth

The SE21 postcode district in London sits across West Dulwich, spanning the local authority areas of Southwark and Lambeth. It groups thousands of unit postcodes used for addressing and is a practical geography for comparing west dulwich property market activity with neighbouring districts. In the 12 months to 28 August 2026, recorded paid sales show an average sold price around £951,295 across 119 transactions in the district. On a year-on-year basis, the average moved about down 5.5% compared with the previous 12 months. The busiest segment was flat / maisonette, with 56 sales in that period—useful context when you compare house prices in SE21 across terraces, flats and houses. Southwark and Lambeth 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.