10a, Eccleston Square, Westminster, London, SW1V 1NP

10a is a mid-terrace house in Westminster, London, London (SW1V 1NP). It has a recorded floor area of 77 m² (around 832 sq ft) and construction records dating it to before 1900. At 77 m² this is the 5th smallest of 12 units on EPC record in the building, where floor areas span 45–440 m². The building's EPC ratings span E to C across 12 units on file. The latest certificate (August 2010) shows a D (score 61), on the cusp of jumping into the C band. The recommended improvements would push it to C (score 70). The latest certificate is from August 2010, so improvements made since then won't be reflected.

It hasn't traded since August 1997, a hold of 29 years that's notably long for the area. At 77 m² the property is well over the postcode median (57 m² across 37 EPCs), placing it in the larger end of the local stock. Across 1996–1997, sale prices on this property compounded at 118.4% per year. Today's modelled estimate of £611,000 sits 123.4% above the 1997 sale of £273,500. On a £-per-square-foot basis, the last sale (£329/sq ft) was about 61.6% below the postcode norm.