23 Caldey Island House, Ferry Court, Cardiff, CF11 0JN

23 Caldey Island House is a one-bedroom end-of-terrace house in Cardiff (CF11 0JN). It has a recorded floor area of 42 m² (around 452 sq ft), construction records dating it to 2003-2006 and council tax band D. The latest certificate (November 2018) shows a C (score 77), near the top of the C band. The rating has held steady at C across 2 certificates since December 2008. Between certificates, lighting went from Very Poor to Average; while hot-water efficiency dropped from Average to Very Poor. The recommended improvements would push it to B (score 87). Main heating runs on electricity. At 42 m² this is the 11th smallest of 86 units on EPC record in the building, where floor areas span 36–87 m². The building's EPC ratings span E to B across 86 units on file. Other recorded features include a balcony and notable views.

Held since July 2006 — that's 20 years off the open market, well above the local norm. At 42 m² it sits well below the postcode median (61 m² across 85 EPCs), making it one of the more compact homes locally.