Delven House, Flat 3, 12 Delven Lane, Castle Donington, Derby, DE74 2LJ

Delven House is a one-bedroom semi-detached house in Castle Donington, Derby, Derby (DE74 2LJ). It has a recorded floor area of 30 m² (around 323 sq ft), construction records dating it to 1900-1929 and council tax band A. At 30 m² this is the 3rd smallest of 6 units on EPC record in Delven House, where floor areas span 25–53 m². The building's EPC ratings span D to C, with this unit at the top. The latest certificate (May 2019) shows a C (score 69), just inside the C band. The rating has held steady at C across 3 certificates since October 2008. Between certificates, wall efficiency went from Very Poor to Poor; while hot-water efficiency dropped from Very Good to Good and lighting dropped from Very Good to Average.

Held since August 2008 — that's 18 years off the open market, well above the local norm. That sale landed at the peak of the pre-credit-crunch market, which is a useful reference point when interpreting the price. At 30 m² it sits well below the postcode median (51 m² across 12 EPCs), making it one of the more compact homes locally. 3 planning records sit against the property, 2 approved, 1 refused. Past consents include subdivision, meaningful when judging how the property has evolved. Today's modelled estimate of £126,000 is 26% above the 2008 sale price. On a £-per-square-foot basis, the last sale (£310/sq ft) was about 50.4% above the typical sold price in the postcode.