Flat 9, 41 Eccleston Square, London, SW1V 1PB

Flat 9 is a one-bedroom end-of-terrace house in London (SW1V 1PB). It has a recorded floor area of 30 m² (around 323 sq ft), construction records dating it to before 1900 and council tax band D. The latest certificate (August 2020) shows a D (score 64), on the cusp of jumping into the C band. Earlier certificates rated it C (October 2010); the latest reading is one band lower. Between certificates, roof efficiency went from Very Poor to Poor; while hot-water efficiency dropped from Very Good to Good and main heating dropped from Very Good to Good. The recommended improvements would push it to C (score 75). At 30 m² this is the 2nd smallest of 8 units on EPC record in the building, where floor areas span 22–72 m². The building's EPC ratings span E to C across 8 units on file.

Held since May 2007 — that's 19 years off the open market, well above the local norm. Across the public record there are 4 sales, relatively high churn for a single property. That sale landed at the peak of the pre-credit-crunch market, which is a useful reference point when interpreting the price. At 30 m² it sits well below the postcode median (65 m² across 15 EPCs), making it one of the more compact homes locally. Across 2002–2007, sale prices on this property compounded at 8.3% per year. Today's modelled estimate of £426,000 is 42% above the 2007 sale price. On a £-per-square-foot basis, the last sale (£929/sq ft) was about 70.3% above the typical sold price in the postcode.