Flat 1, 17 Onslow Square, London, SW7 3NJ

Flat 1 is a mid-terrace house in London (SW7 3NJ). It has a recorded floor area of 116 m² (around 1249 sq ft), construction records dating it to before 1900 and council tax band H. At 116 m² this is the largest unit on EPC record across the building (110–116 m²). On EPC score it ranks last in the building (69 versus a best of 80). The latest certificate (October 2016) shows a C (score 69), just inside the C band. The recommended improvements would push it to B (score 81).

Across 1996–2022, sale prices on this property compounded at 11.1% per year. Today's modelled estimate of £1,801,000 is 50% below the 2022 sale of £3,600,000, below the original sale price, which typically signals condition or completion-status changes worth verifying. On a £-per-square-foot basis, the last sale (£2,883/sq ft) was about 238.8% above the typical sold price in the postcode. 9 planning records sit against the property, 7 approved, 2 refused. Past consents include new windows and an extension, meaningful when judging how the property has evolved. The record references listed-building consent, which constrain future alterations. Last sale on file: £3,600,000 in August 2022. That sale was during the post-pandemic price surge, when transactions cleared materially above pre-2020 trend.