Flat 2, 47 Belsize Park Gardens, London, NW3 4JL

Flat 2 is a three-bedroom semi-detached house in London (NW3 4JL). It has a recorded floor area of 134 m² (around 1442 sq ft), construction records dating it to before 1900 and council tax band F. At 134 m² this is the largest unit on EPC record across the building (51–134 m²). The building's EPC ratings span E to B, with this unit at the bottom. On EPC score it ranks last in the building (52 versus a best of 81). Period features are noted in the property record. The latest certificate (August 2016) shows an E (score 52), well below the UK norm with real room to improve. The recommended improvements would lift it to B (score 81), a 3-band jump.

It hasn't traded since August 2009, a hold of 17 years that's notably long for the area. That sale fell during the post-crash dip, which often skews comparisons against later neighbouring sales. At 134 m² the property is well over the postcode median (72 m² across 25 EPCs), placing it in the larger end of the local stock. On energy efficiency it sits in the bottom 10% of properties in this postcode — significant headroom for improvement. Today's modelled estimate of £1,269,000 sits 126.6% above the 2009 sale of £560,000. On a £-per-square-foot basis, the last sale (£388/sq ft) was about 37.8% below the postcode norm.