23a, Birkbeck Hill, Lambeth, London, SE21 8JS

23a is a semi-detached house in Lambeth, London, London (SE21 8JS). It has a recorded floor area of 46 m² (around 495 sq ft) and construction records dating it to before 1900. At 46 m² this is the 3rd smallest of 33 units on EPC record in the building, where floor areas span 29–146 m². The building's EPC ratings span E to C across 33 units on file. The latest certificate (June 2017) shows a D (score 55), a step below the typical UK home. The recommended improvements would push it to C (score 72).

Held since February 2007 — that's 19 years off the open market, well above the local norm. That sale landed at the peak of the pre-credit-crunch market, which is a useful reference point when interpreting the price. Today's modelled estimate of £328,000 sits 111.6% above the 2007 sale of £155,000. On a £-per-square-foot basis, the last sale (£313/sq ft) was about 21.9% above the typical sold price in the postcode. At 46 m² it sits well below the postcode median (72 m² across 47 EPCs), making it one of the more compact homes locally.