23a, Basement Flat, Campbell Road, Brighton, BN1 4QD

23a is a mid-terrace house in Brighton (BN1 4QD). It has a recorded floor area of 41 m² (around 441 sq ft) and construction records dating it to before 1900. The latest certificate (March 2023) shows a D (score 67), on the cusp of jumping into the C band. When first surveyed in June 2009 the rating was F, the property has climbed 2 bands since. Between certificates, window efficiency went from Very Poor to Poor, hot-water efficiency went from Very Poor to Good and lighting went from Very Poor to Good; while wall efficiency dropped from Poor to Very Poor. The recommended improvements would push it to C (score 75). At 41 m² this is the 6th smallest of 14 units on EPC record in the building, where floor areas span 27–49 m². The building's EPC ratings span G to C across 14 units on file.

It hasn't traded since September 2005, a hold of 21 years that's notably long for the area. Across 2000–2005, sale prices on this property compounded at 22.7% per year. Today's modelled estimate of £242,000 is 38.3% above the 2005 sale price. On a £-per-square-foot basis, the last sale (£397/sq ft) was about 52.3% above the typical sold price in the postcode. At 41 m² it's 19.6% smaller than the typical home in the postcode (51 m² median across 73 EPCs).