20 Castleton Road, Stockton On Tees, TS18 3LP

20 Castleton Road is a mid-terrace house in Stockton On Tees (TS18 3LP). It has a recorded floor area of 110 m² (around 1184 sq ft), construction records dating it to 1930-1949 and council tax band A. The latest certificate (June 2022) shows an F (score 34), near the bottom of the EPC scale. Earlier certificates rated it E (October 2016); the latest reading is one band lower. Between certificates, window efficiency went from Average to Good, hot-water efficiency went from Poor to Average and lighting went from Good to Very Good; while wall efficiency dropped from Good to Poor. The recommended improvements would lift it to C (score 72), a 3-band jump.

Held since February 2006 — that's 21 years off the open market, well above the local norm. At 110 m² the property is well over the postcode median (71 m² across 30 EPCs), placing it in the larger end of the local stock. On energy efficiency it sits in the bottom 10% of properties in this postcode — significant headroom for improvement. Across 2005–2006, sale prices on this property compounded at 25% per year. Today's modelled estimate of £112,000 sits 124% above the 2006 sale of £50,000. On a £-per-square-foot basis, the last sale (£42/sq ft) was about 58.4% below the postcode norm.