20a, East Heath Road, Camden, London, NW3 1AJ

20a is a semi-detached house in Camden, London, London (NW3 1AJ). It has a recorded floor area of 117 m² (around 1259 sq ft) and construction records dating it to 1900-1929. The latest certificate (March 2015) shows an F (score 34), near the bottom of the EPC scale. Earlier certificates rated it D (October 2009); the latest reading is 2 bands lower. Between certificates, hot-water efficiency dropped from Good to Average. The recommended improvements would lift it to C (score 72), a 3-band jump. The latest certificate is from March 2015, so improvements made since then won't be reflected. At 117 m² this is the 4th smallest of 11 units on EPC record in the building, where floor areas span 32–313 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 (34 versus a best of 80).

It hasn't traded since March 2010, a hold of 16 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. Today's modelled estimate of £1,221,000 sits 106.9% above the 2010 sale of £590,000. On a £-per-square-foot basis, the last sale (£468/sq ft) was about 34.1% above the typical sold price in the postcode.