NW9 postcode district — Welsh Harp, Barnet, Brent and Harrow

The NW9 postcode district in London sits across Welsh Harp, spanning the local authority areas of Barnet, Brent and Harrow. It groups thousands of unit postcodes used for addressing and is a practical geography for comparing welsh harp property market activity with neighbouring districts. In the 12 months to 31 March 2026, recorded paid sales show an average sold price around £434,419 across 286 transactions in the district. On a year-on-year basis, the average moved about down 6.7% compared with the previous 12 months. The busiest segment was flat / maisonette, with 201 sales in that period—useful context when you compare house prices in NW9 across terraces, flats and houses. Barnet, Brent and Harrow 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.