23 Castles Green, Newcastle Upon Tyne, NE12 6BU

23 Castles Green is a one-bedroom detached house in Newcastle Upon Tyne (NE12 6BU). It has a recorded floor area of 33 m² (around 355 sq ft), construction records dating it to 1967-1975 and council tax band A. The latest certificate (April 2017) shows an F (score 36), near the bottom of the EPC scale. When first surveyed in April 2009 the rating was G, the property has climbed 1 band since. Between certificates, hot-water efficiency went from Very Poor to Poor and lighting went from Very Poor to Very Good. The recommended improvements would lift it to C (score 74), a 3-band jump. Main heating runs on electricity. At 33 m² this is the 4th smallest of 23 units on EPC record in the building, where floor areas span 30–90 m². The building's EPC ratings span F to C, with this unit at the bottom.

At 33 m² it sits well below the postcode median (49 m² across 22 EPCs), making it one of the more compact homes locally. On energy efficiency it sits in the bottom 10% of properties in this postcode — significant headroom for improvement. Across 1998–2017, sale prices on this property compounded at 6.2% per year. Today's modelled estimate of £95,000 sits 61% above the 2017 sale of £59,000. On a £-per-square-foot basis, the last sale (£166/sq ft) was about 38.7% above the typical sold price in the postcode. Last changed hands 9 years ago, in September 2017.