15a, Basement Flat, Campbell Road, Brighton, BN1 4QD

15a is a detached house in Brighton (BN1 4QD). It has a recorded floor area of 27 m² (around 293 sq ft) and construction records dating it to before 1900. At 27 m² this is the smallest unit on EPC record across the building (27–49 m²). The building's EPC ratings span G to C across 14 units on file. The latest certificate (February 2011) shows a D (score 58), a step below the typical UK home. The recommended improvements would push it to C (score 75). The latest certificate is from February 2011, so improvements made since then won't be reflected.

It hasn't traded since August 2007, a hold of 19 years that's notably long for the area. That sale landed at the peak of the pre-credit-crunch market, which is a useful reference point when interpreting the price. At 27 m² it sits well below the postcode median (51 m² across 73 EPCs), making it one of the more compact homes locally. Across 1998–2007, sale prices on this property compounded at 18.2% per year. Today's modelled estimate of £243,000 is 35.4% above the 2007 sale price. On a £-per-square-foot basis, the last sale (£614/sq ft) was about 134.6% above the typical sold price in the postcode.