20 Alderney House, Ferry Court, Cardiff, CF11 0JT

20 Alderney House is a two-bedroom semi-detached house in Cardiff (CF11 0JT). It has a recorded floor area of 68 m² (around 732 sq ft), construction records dating it to 2007-2011 and council tax band E. There is a swimming pool on the plot, uncommon for the area. At 68 m² this is the 45th smallest of 56 units on EPC record in the building, where floor areas span 40–92 m². The building's EPC ratings span D to B across 56 units on file. The latest certificate (April 2024) shows a C (score 79), near the top of the C band. Earlier certificates rated it B (January 2014); the latest reading is one band lower. Between certificates, lighting went from Good to Very 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.

Held since October 2007 — that's 19 years off the open market, well above the local norm. That sale landed at the peak of the pre-credit-crunch market, which is a useful reference point when interpreting the price. At 68 m² it's 25.9% larger than the typical home in the postcode (54 m² median across 55 EPCs). Today's modelled estimate of £138,000 is 13.9% above the 2007 sale price. On a £-per-square-foot basis, the last sale (£166/sq ft) was about 38.6% below the postcode norm.