20 Oxford Castle, New Road, Oxford, OX1 1AY

20 Oxford Castle is a one-bedroom end-of-terrace house in Oxford (OX1 1AY). It has a recorded floor area of 43 m² (around 463 sq ft), construction records dating it to 2003-2006 and council tax band D. The latest certificate (June 2019) shows a C (score 79), near the top of the C band. Earlier certificates rated it B (July 2009); the latest reading is one band lower. Between certificates, hot-water efficiency dropped from Average to Poor and main heating dropped from Poor to Very Poor. The recommended improvements would push it to B (score 85). Main heating runs on electricity. At 43 m² this is the 2nd smallest of 32 units on EPC record in the building, where floor areas span 37–105 m². The building's EPC ratings span D to B across 32 units on file. Other recorded features include a balcony.

Across 2006–2012, sale prices on this property compounded at 4.3% per year. Today's modelled estimate of £350,000 is 30.4% above the 2012 sale price. On a £-per-square-foot basis, the last sale (£580/sq ft) was about 39.7% above the typical sold price in the postcode. On the market in October 2012 and unlisted since — roughly 14 years. At 43 m² it's 18.9% smaller than the typical home in the postcode (53 m² median across 31 EPCs).