9 Railway House, Alliance Street, Darlington, DL3 0BE

9 Railway House is a mid-terrace house in Darlington (DL3 0BE). It has a recorded floor area of 24 m² (around 258 sq ft), construction records dating it to 1900-1929 and council tax band A. At 24 m² this is the smallest unit on EPC record across the building (24–58 m²). The building's EPC ratings span D to C, with this unit at the bottom. The latest certificate (February 2022) shows a D (score 68), on the cusp of jumping into the C band. Earlier certificates rated it B (January 2009); the latest reading is 2 bands lower. Between certificates, lighting went from Very Poor to Very Good; while wall efficiency dropped from Good to Poor and window efficiency dropped from Good to Average. The recommended improvements would push it to C (score 70).

It hasn't traded since October 2008, a hold of 18 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 24 m² it sits well below the postcode median (45 m² across 7 EPCs), making it one of the more compact homes locally. Today's modelled estimate of £121,000 is 24.7% above the 2008 sale price. On a £-per-square-foot basis, the last sale (£375/sq ft) was about 87.5% above the typical sold price in the postcode.