3 Armstrong Court, Darlington, DL3 9LB

3 Armstrong Court is a one-bedroom detached house in Darlington (DL3 9LB). It has a recorded floor area of 40 m² (around 431 sq ft), construction records dating it to 1976-1982 and council tax band A. At 40 m² this is the smallest unit on EPC record across the building (40–59 m²). The building's EPC ratings span E to D, with this unit at the bottom. On EPC score it ranks last in the building (48 versus a best of 68). The latest certificate (April 2019) shows an E (score 48), well below the UK norm with real room to improve. The recommended improvements would lift it to C (score 76), a 2-band jump. Main heating runs on electricity.

It hasn't traded since February 1999, a hold of 27 years that's notably long for the area. Only one transfer is on record with HM Land Registry, suggesting it has stayed in the same hands for a long time. Today's modelled estimate of £105,000 sits 192.1% above the 1999 sale of £35,950. On a £-per-square-foot basis, the last sale (£83/sq ft) was about 35% below the postcode norm. At 40 m² it's 20.8% smaller than the typical home in the postcode (51 m² median across 6 EPCs).