1b, Alexandra Grove, London, N4 2LG

1b is a semi-detached house in London (N4 2LG). It has a recorded floor area of 51 m² (around 549 sq ft) and construction records dating it to before 1900. The latest certificate (April 2021) shows a D (score 68), on the cusp of jumping into the C band. The rating has held steady at D across 2 certificates since March 2010. Between certificates, window efficiency went from Very Poor to Average and lighting went from Very Poor to Very Good. The recommended improvements would push it to C (score 78). At 51 m² this is the 6th smallest of 23 units on EPC record in the building, where floor areas span 39–192 m². The building's EPC ratings span E to B across 23 units on file.

Held since June 2010 — that's 16 years off the open market, well above the local norm. Today's modelled estimate of £499,000 sits 63.6% above the 2010 sale of £305,000. On a £-per-square-foot basis, the last sale (£556/sq ft) was about 21.9% above the typical sold price in the postcode. At 51 m² it's 21.5% smaller than the typical home in the postcode (65 m² median across 39 EPCs).