Flat 4, 21 Priory Street, York, YO1 6ET

Flat 4 is a one-bedroom end-of-terrace house in York (YO1 6ET). It has a recorded floor area of 20 m² (around 215 sq ft), construction records dating it to before 1900 and council tax band A. At 20 m² this is the smallest unit on EPC record across the building (20–25 m²). The building's EPC ratings span E to C, with this unit at the bottom. On EPC score it ranks last in the building (42 versus a best of 78). The latest certificate (November 2019) shows an E (score 42), well below the UK norm with real room to improve. Earlier certificates rated it D (November 2008); the latest reading is one band lower. Between certificates, lighting went from Average to Good; while wall efficiency dropped from Good to Poor. The recommended improvements would lift it to C (score 78), a 2-band jump. Main heating runs on electricity.

At 20 m² it sits well below the postcode median (52 m² across 24 EPCs), making it one of the more compact homes locally. It lags the bulk of the postcode on energy efficiency (less efficient than 83% of similar EPCs). Today's modelled estimate of £125,000 is 45.3% above the 2019 sale price. On a £-per-square-foot basis, the last sale (£399/sq ft) was about 20.2% above the typical sold price in the postcode. Sold October 2019 for £86,000.