17a, Belsize Square, Camden, London, NW3 4HT

17a is a mid-terrace house in Camden, London, London (NW3 4HT). It has a recorded floor area of 121 m² (around 1302 sq ft) and construction records dating it to 1900-1929. At 121 m² this is the 18th smallest of 23 units on EPC record in the building, where floor areas span 36–449 m². The building's EPC ratings span E to C, with this unit at the top. The latest certificate (November 2022) shows a C (score 69), just inside the C band. When first surveyed in February 2009 the rating was E, the property has climbed 2 bands since. Between certificates, wall efficiency went from Very Poor to Poor, window efficiency went from Very Poor to Poor and lighting went from Very Poor to Very Good.

8 planning records sit against the property, 3 approved, 1 refused. Past consents include an extension and a garage conversion, meaningful when judging how the property has evolved. At 121 m² it's 29.2% larger than the typical home in the postcode (94 m² median across 74 EPCs). Across 1996–2011, sale prices on this property compounded at 11.1% per year. Today's modelled estimate of £1,475,000 is 47.5% above the 2011 sale price. On a £-per-square-foot basis, the last sale (£768/sq ft) was about 35.4% above the typical sold price in the postcode. On the market in June 2011 and unlisted since — roughly 15 years.