16c, Belsize Square, London, NW3 4HT

16c is a semi-detached house in London (NW3 4HT). It has a recorded floor area of 60 m² (around 646 sq ft), construction records dating it to 1900-1929 and council tax band E. The latest certificate (September 2012) shows an F (score 38), near the bottom of the EPC scale. Earlier certificates rated it D (January 2010); the latest reading is 2 bands lower. The recommended improvements would lift it to C (score 71), a 3-band jump. The latest certificate is from September 2012, so improvements made since then won't be reflected. At 60 m² this is the 22nd smallest of 52 units on EPC record in the building, where floor areas span 39–211 m². The building's EPC ratings span F to C, with this unit at the bottom. On EPC score it ranks last in the building (38 versus a best of 77).

It hasn't traded since July 2010, a hold of 16 years that's notably long for the area. At 60 m² it sits well below the postcode median (97 m² across 74 EPCs), making it one of the more compact homes locally. On energy efficiency it sits in the bottom 10% of properties in this postcode — significant headroom for improvement. Across 2005–2010, sale prices on this property compounded at 7.7% per year. Today's modelled estimate of £729,000 sits 53.5% above the 2010 sale of £475,000. On a £-per-square-foot basis, the last sale (£735/sq ft) was about 29.7% above the typical sold price in the postcode.