21a, Birkbeck Hill, London, SE21 8JS

21a is a two-bedroom mid-terrace house in London (SE21 8JS). It has a recorded floor area of 42 m² (around 452 sq ft) and construction records dating it to 1967-1975. Tenure is freehold. The latest certificate (July 2020) shows a D (score 67), on the cusp of jumping into the C band. The rating has held steady at D across 2 certificates since July 2010. Between certificates, lighting went from Very Poor to Very Good. The recommended improvements would push it to C (score 78). At 42 m² this is the 2nd smallest of 15 units on EPC record in the building, where floor areas span 29–115 m². The building's EPC ratings span E to B across 15 units on file. Records show the property has been extended at some point in its history.

At 42 m² it sits well below the postcode median (72 m² across 47 EPCs), making it one of the more compact homes locally. Across 2001–2024, sale prices on this property compounded at 4.4% per year. On a £-per-square-foot basis, the last sale (£719/sq ft) was about 184.8% above the typical sold price in the postcode. Sold August 2024 for £325,000.