Southworth House, Apartment 10, Preston New Road, Blackburn, BB2 7AL

Southworth House is a detached house in Blackburn (BB2 7AL). It has a recorded floor area of 69 m² (around 743 sq ft). The latest certificate (April 2013) returns a high B (score 86), putting the home a stone's throw from an A rating. The rating has held steady at B across 2 certificates since March 2013. The latest certificate is from April 2013, so improvements made since then won't be reflected. At 69 m² this is the 31st smallest of 33 units on EPC record in Southworth House, where floor areas span 31–74 m². The building's EPC ratings span C to B, with this unit at the top. On EPC score it ranks first in the building (86 versus a worst of 71).

Today's modelled estimate of £136,000 is 12.3% below the 2010 sale of £155,000, a rare downward gap that often correlates with deferred maintenance or unfinished works. On a £-per-square-foot basis, the last sale (£209/sq ft) was about 22.1% below the postcode norm. Held since August 2010 — that's 16 years off the open market, well above the local norm.