14a, Parsons Mead, Croydon, CR0 3SL

14a is a one-bedroom semi-detached house in Croydon (CR0 3SL). It has a recorded floor area of 42 m² (around 452 sq ft), construction records dating it to 1900-1929 and council tax band C. The latest certificate (August 2018) shows a D (score 64), on the cusp of jumping into the C band. Earlier certificates rated it C (November 2009); the latest reading is one band lower. Between certificates, wall efficiency went from Very Poor to Poor, window efficiency went from Very Poor to Average and lighting went from Very Poor to Very Good; while roof efficiency dropped from Good to Average. The recommended improvements would push it to C (score 77). At 42 m² this is the 10th smallest of 63 units on EPC record in the building, where floor areas span 28–144 m². The building's EPC ratings span F to B across 63 units on file.

Held since May 2002 — that's 24 years off the open market, well above the local norm. Today's modelled estimate of £205,000 sits 228% above the 2002 sale of £62,500. On a £-per-square-foot basis, the last sale (£138/sq ft) was about 19.2% below the postcode norm. At 42 m² it's 28.2% smaller than the typical home in the postcode (59 m² median across 62 EPCs).