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

21 Oxford Castle is a one-bedroom mid-terrace house in Oxford (OX1 1AY). It has a recorded floor area of 43 m² (around 463 sq ft), construction records dating it to 2007-2011 and council tax band D. The latest certificate (May 2021) shows a C (score 80), near the top of the C band. Earlier certificates rated it B (May 2011); the latest reading is one band lower. Between certificates, lighting went from Average to Good; while 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.

Held since July 2011 — that's 15 years off the open market, well above the local norm. Across 2006–2011, sale prices on this property compounded at 4.8% per year. Today's modelled estimate of £351,000 is 43.3% above the 2011 sale price. On a £-per-square-foot basis, the last sale (£529/sq ft) was about 26.6% above the typical sold price in the postcode. At 43 m² it's 18.9% smaller than the typical home in the postcode (53 m² median across 31 EPCs).