Flat 4, 25 Well Walk, London, NW3 1BY

Flat 4 is a three-bedroom semi-detached house in London (NW3 1BY). It has a recorded floor area of 133 m² (around 1432 sq ft), construction records dating it to before 1900 and council tax band G. The latest certificate (October 2019) shows an E (score 53), well below the UK norm with real room to improve. When first surveyed in July 2012 the rating was F, the property has climbed 1 band since. Between certificates, roof efficiency went from Very Poor to Good and lighting went from Very Poor to Very Good. The recommended improvements would lift it to C (score 71), a 2-band jump. At 133 m² this is the 3rd smallest of 4 units on EPC record in the building, where floor areas span 83–137 m². The building's EPC ratings span E to D, with this unit at the bottom. On EPC score it ranks last in the building (53 versus a best of 66). Other recorded features include a balcony. Period features are noted in the property record.

Held since March 1996 — that's 30 years off the open market, well above the local norm. Only one transfer is on record with HM Land Registry, suggesting it has stayed in the same hands for a long time. Today's modelled estimate of £1,709,000 sits 533% above the 1996 sale of £270,000. On a £-per-square-foot basis, the last sale (£189/sq ft) was about 76.8% below the postcode norm. It lags the bulk of the postcode on energy efficiency (less efficient than 80% of similar EPCs).