Flat 1a, 25 Onslow Square, Kensington And Chelsea, London, SW7 3NJ

Flat 1a is a one-bedroom mid-terrace house in Kensington And Chelsea, London, London (SW7 3NJ). It has a recorded floor area of 40 m² (around 431 sq ft), construction records dating it to before 1900 and council tax band F. At 40 m² this is the smallest unit on EPC record across the building (40–173 m²). The building's EPC ratings span E to B across 8 units on file. The latest certificate (January 2024) shows a C (score 74). When first surveyed in August 2009 the rating was D, the property has climbed 1 band since.

2 planning records sit against the property, 2 approved, 0 refused. The record references listed-building consent, which constrain future alterations. At 40 m² it sits well below the postcode median (110 m² across 35 EPCs), making it one of the more compact homes locally. Last sale on file: £560,000 in October 2020. Across the public record there are 4 sales, relatively high churn for a single property. Across 1998–2020, sale prices on this property compounded at 7.5% per year. On a £-per-square-foot basis, the last sale (£1,301/sq ft) was about 41.3% above the typical sold price in the postcode.