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

30 Caldey Island House is a two-bedroom mid-terrace house in Cardiff (CF11 0JN). It has a recorded floor area of 59 m² (around 635 sq ft), construction records dating it to 1983-1990 and council tax band E. The latest certificate (November 2022) shows a C (score 78), near the top of the C band. Earlier certificates rated it B (August 2011); the latest reading is one band lower. Between certificates, wall efficiency went from Good to Very Good and lighting went from Very Poor to Good; while window efficiency dropped from Good to Average and 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 59 m² this is the 36th 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.

Held since July 2006 — that's 20 years off the open market, well above the local norm. On a £-per-square-foot basis, the last sale (£346/sq ft) was about 15.3% above the typical sold price in the postcode.