Delven House, Flat 5, 12 Delven Lane, Castle Donington, Derby, DE74 2LJ

Delven House is a semi-detached house in Castle Donington, Derby, Derby (DE74 2LJ). It has a recorded floor area of 25 m² (around 269 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 Delven House (25–53 m²). The building's EPC ratings span D to C, with this unit at the bottom. The latest certificate (November 2018) shows a D (score 64), on the cusp of jumping into the C band. Earlier certificates rated it C (October 2008); the latest reading is one band lower. Between certificates, wall efficiency went from Very Poor to Poor; while window efficiency dropped from Average to Poor and hot-water efficiency dropped from Very Good to Good. The recommended improvements would push it to C (score 70).

It hasn't traded since August 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 25 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 48.2% above the 2008 sale price. On a £-per-square-foot basis, the last sale (£316/sq ft) was about 53.4% above the typical sold price in the postcode.