99b, High Street, Carrville, Durham, DH1 1BQ

99b is a one-bedroom mid-terrace house in Carrville, Durham, Durham (DH1 1BQ). It has a recorded floor area of 25 m² (around 273 sq ft), construction records dating it to 1900-1929 and council tax band A. At 25 m² this is the smallest unit on EPC record across the building (25–144 m²). The building's EPC ratings span F to C, with this unit at the top. On EPC score it ranks first in the building (79 versus a worst of 36). The latest certificate (October 2011) shows a C (score 79), near the top of the C band. When first surveyed in November 2009 the rating was D, the property has climbed 1 band since. Between certificates, window efficiency went from Average to Good and lighting went from Very Poor to Very Good; while wall efficiency dropped from Poor to Very Poor and hot-water efficiency dropped from Good to Very Poor. Main heating runs on electricity. The latest certificate is from October 2011, so improvements made since then won't be reflected.

Untraded for 19 years, with the last transfer in April 2007. That sale landed at the peak of the pre-credit-crunch market, which is a useful reference point when interpreting the price. Across 2003–2007, sale prices on this property compounded at 20.4% per year. Today's modelled estimate of £93,000 sits 55% above the 2007 sale of £60,000. On a £-per-square-foot basis, the last sale (£219/sq ft) was about 167.7% above the typical sold price in the postcode. At 25 m² it sits well below the postcode median (85 m² across 37 EPCs), making it one of the more compact homes locally. 1 bedrooms is on the smaller side for this postcode, where 3 is the typical count. One planning record on file: a loft conversion approved in 2010. Past consents include a loft conversion, meaningful when judging how the property has evolved.