17c, High Green, Gainford, Darlington, DL2 3DL

17c is a mid-terrace house in Gainford, Darlington, Darlington (DL2 3DL). It has a recorded floor area of 166 m² (around 1787 sq ft), construction records dating it to before 1900 and council tax band A. The latest certificate (November 2022) shows a G (score 10), near the bottom of the EPC scale. Earlier certificates rated it F (September 2009); the latest reading is one band lower. Between certificates, wall efficiency went from Very Poor to Poor and lighting went from Good to Very Good; while roof efficiency dropped from Good to Very Poor and window efficiency dropped from Average to Poor. The recommended improvements would lift it to C (score 78), a 4-band jump. Main heating runs on electricity. At 166 m² this is the 15th smallest of 19 units on EPC record in the building, where floor areas span 39–381 m². The building's EPC ratings span G to C, with this unit at the bottom. On EPC score it ranks last in the building (10 versus a best of 80).

Untraded for 21 years, with the last transfer in December 2004. At 166 m² the property is well over the postcode median (97 m² across 18 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. On a £-per-square-foot basis, the last sale (£93/sq ft) was about 30.8% below the postcode norm.