21b, Hewell Lane, Barnt Green, Birmingham, B45 8NZ

21b is a five-bedroom detached house in Barnt Green, Birmingham, Birmingham (B45 8NZ). It has a recorded floor area of 54 m² (around 580 sq ft), construction records dating it to 1950-1966 and council tax band E. At 54 m² this is the smallest unit on EPC record across the building (54–213 m²). The building's EPC ratings span E to C across 17 units on file. Other recorded features include a self-contained annexe. The latest certificate (March 2010) shows a D (score 58), a step below the typical UK home. When first surveyed in March 2010 the rating was E, the property has climbed 1 band since. Between certificates, wall efficiency went from Very Poor to Poor, roof efficiency went from Very Poor to Average and window efficiency went from Poor to Average; while lighting dropped from Poor to Very Poor. The recommended improvements would push it to C (score 76). The latest certificate is from March 2010, so improvements made since then won't be reflected.

At 54 m² it sits well below the postcode median (152 m² across 16 EPCs), making it one of the more compact homes locally. 3 planning records sit against the property, 3 approved, 0 refused. Past consents include an extension, meaningful when judging how the property has evolved. Today's modelled estimate of £860,000 is 32.3% above the 2016 sale price. On a £-per-square-foot basis, the last sale (£1,122/sq ft) was about 336.8% above the typical sold price in the postcode. On the market in August 2016 and unlisted since — roughly 10 years.