Flat 4, 4 Elsworthy Terrace, London, NW3 3DR

Flat 4 is a detached house in London (NW3 3DR). It has a recorded floor area of 74 m² (around 793 sq ft) and construction records dating it to 1900-1929. At 74 m² this is the 3rd smallest of 5 units on EPC record in the building, where floor areas span 33–77 m². The building's EPC ratings span E to C, with this unit at the bottom. On EPC score it ranks last in the building (53 versus a best of 69). The latest certificate (July 2009) shows an E (score 53), well below the UK norm with real room to improve. The recommended improvements would lift it to C (score 71), a 2-band jump. The latest certificate is from July 2009, so improvements made since then won't be reflected.

It hasn't traded since April 1997, a hold of 29 years that's notably long for the area. On energy efficiency it sits in the bottom 10% of properties in this postcode — significant headroom for improvement. Across 1996–1997, sale prices on this property compounded at 73.8% per year. Today's modelled estimate of £965,000 sits 247.1% above the 1997 sale of £278,000. On a £-per-square-foot basis, the last sale (£351/sq ft) was about 38.4% below the postcode norm.