57b, Kelvin Avenue, London, N13 4TH

57b is a mid-terrace house in London (N13 4TH). It has a recorded floor area of 33 m² (around 355 sq ft), construction records dating it to 2007 onwards and council tax band D. At 33 m² this is the 7th smallest of 11 units on EPC record in the building, where floor areas span 17–75 m². The building's EPC ratings span E to C, with this unit at the top. On EPC score it ranks first in the building (78 versus a worst of 39). The latest certificate (August 2019) shows a C (score 78), near the top of the C band. The rating has held steady at C across 2 certificates since October 2009. Between certificates, wall efficiency went from Very Poor to Good and lighting went from Very Poor to Very Good; while main heating dropped from Very Good to Good.

Today's modelled estimate of £273,000 sits 83.1% above the 2021 sale of £149,120. On a £-per-square-foot basis, the last sale (£420/sq ft) was about 15.7% above the typical sold price in the postcode. At 33 m² it sits well below the postcode median (69 m² across 35 EPCs), making it one of the more compact homes locally. Its energy rating outperforms most of the postcode (better than 80% of similar EPCs). Last sale on file: £149,120 in August 2021. That sale was during the post-pandemic price surge, when transactions cleared materially above pre-2020 trend.