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

10 Caldey Island House is a mid-terrace house in Cardiff (CF11 0JN). It has a recorded floor area of 42 m² (around 452 sq ft), construction records dating it to 1996-2002 and council tax band D. The latest certificate (November 2018) shows a D (score 63), on the cusp of jumping into the C band. Earlier certificates rated it C (November 2008); the latest reading is one band lower. Between certificates, lighting went from Good to Very Good; while window efficiency dropped from Good to Average. The recommended improvements would push it to C (score 79). 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.

At 42 m² it sits well below the postcode median (61 m² across 85 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 2006–2023, sale prices on this property compounded at -2.6% per year. Today's modelled estimate of £143,000 sits 54.6% above the 2023 sale of £92,500. On a £-per-square-foot basis, the last sale (£205/sq ft) was about 31.9% below the postcode norm. Last sale on file: £92,500 in September 2023.