23a, Robert Street, Brighton, BN1 4AH

23a is a one-bedroom detached house in Brighton (BN1 4AH). It has a recorded floor area of 30 m² (around 319 sq ft) and construction records dating it to before 1900. At 30 m² this is the smallest unit on EPC record across the building (30–99 m²). The building's EPC ratings span E to C, with this unit at the top. The latest certificate (May 2011) shows a C (score 70). When first surveyed in October 2008 the rating was E, the property has climbed 2 bands since. Between certificates, hot-water efficiency went from Very Poor to Poor, lighting went from Very Poor to Average and main heating went from Very Poor to Average. Main heating runs on to be used only when there is no heating/hot. The latest certificate is from May 2011, so improvements made since then won't be reflected.

Today's modelled estimate of £220,000 sits 53.8% above the 2011 sale of £143,000. On a £-per-square-foot basis, the last sale (£449/sq ft) was about 25.3% above the typical sold price in the postcode. At 30 m² it sits well below the postcode median (64 m² across 28 EPCs), making it one of the more compact homes locally. One planning record on file: an extension approved in 2019. Past consents include an extension, meaningful when judging how the property has evolved. Last changed hands 15 years ago, in July 2011.