Altolusso, Flat 24, Bute Terrace, Cardiff, CF10 2FF

Altolusso is a two-bedroom mid-terrace house in Cardiff (CF10 2FF). It has a recorded floor area of 69 m² (around 747 sq ft), construction records dating it to 2003-2006 and council tax band F. At 69 m² this is the 50th smallest of 83 units on EPC record in Altolusso, where floor areas span 47–116 m². The building's EPC ratings span E to B, with this unit at the bottom. On EPC score it ranks last in the building (45 versus a best of 86). The latest certificate (March 2010) shows an E (score 45), well below the UK norm with real room to improve. Earlier certificates rated it C (July 2009); the latest reading is 2 bands lower. Between certificates, window efficiency went from Average to Good and lighting went from Very Poor to Average; while hot-water efficiency dropped from Average to Very Poor. The recommended improvements would lift it to C (score 71), a 2-band jump. Main heating runs on electricity. The latest certificate is from March 2010, so improvements made since then won't be reflected.

On energy efficiency it sits in the bottom 10% of properties in this postcode — significant headroom for improvement. Across 2004–2011, sale prices on this property compounded at -2.2% per year. Today's modelled estimate of £154,000 is 28.3% above the 2011 sale price. On a £-per-square-foot basis, the last sale (£161/sq ft) was about 22.6% below the postcode norm. Last changed hands 15 years ago, in August 2011.