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

21 Caldey Island House is a one-bedroom mid-terrace house in Cardiff (CF11 0JN). It has a recorded floor area of 37 m² (around 398 sq ft), construction records dating it to 2003-2006 and council tax band D. The latest certificate (March 2020) shows a C (score 79), near the top of the C band. When first surveyed in June 2009 the rating was E, the property has climbed 2 bands since. Between certificates, lighting went from Poor to Very Good. The recommended improvements would push it to B (score 88). Main heating runs on electricity. At 37 m² this is the 5th 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.

Today's modelled estimate of £128,000 is 16.3% below the 2006 sale of £153,000, an unusual pattern given regional price growth and worth checking against the EPC condition. On a £-per-square-foot basis, the last sale (£384/sq ft) was about 27.8% above the typical sold price in the postcode. It hasn't traded since August 2006, a hold of 20 years that's notably long for the area. At 37 m² it sits well below the postcode median (61 m² across 85 EPCs), making it one of the more compact homes locally.