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

11 Alderney House is a two-bedroom semi-detached house in Cardiff (CF11 0JT). It has a recorded floor area of 45 m² (around 484 sq ft), construction records dating it to 2003-2006 and council tax band E. The latest certificate (August 2019) shows a C (score 72). The rating has held steady at C across 2 certificates since August 2009. Between certificates, window efficiency dropped from Good to Average and hot-water efficiency dropped from Average to Poor. The recommended improvements would push it to B (score 81). Main heating runs on electricity. At 45 m² this is the 13th 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.

Today's modelled estimate of £153,000 is 32% below the 2007 sale of £225,000, below the original sale price, which typically signals condition or completion-status changes worth verifying. On a £-per-square-foot basis, the last sale (£465/sq ft) was about 72.4% above the typical sold price in the postcode. It hasn't traded since August 2007, a hold of 19 years that's notably long for the area. That sale landed at the peak of the pre-credit-crunch market, which is a useful reference point when interpreting the price. At 45 m² it's 18.2% smaller than the typical home in the postcode (55 m² median across 55 EPCs).