Flat 3, 164 Marlborough Road, Cardiff, CF23 5BZ

Flat 3 is a semi-detached house in Cardiff (CF23 5BZ). It has a recorded floor area of 53 m² (around 570 sq ft), construction records dating it to 1930-1949 and council tax band D. At 53 m² this is the smallest unit on EPC record across the building (53–93 m²). The building's EPC ratings span D to C, with this unit at the top. On EPC score it ranks first in the building (80 versus a worst of 65). The latest certificate (June 2020) shows a C (score 80), near the top of the C band. The rating has held steady at C across 3 certificates since October 2008. Between certificates, wall efficiency went from Very Poor to Poor, window efficiency went from Average to Good and lighting went from Very Poor to Very Good; while main heating dropped from Very Good to Good. The recommended improvements would push it to B (score 82).

At 53 m² it sits well below the postcode median (113 m² across 16 EPCs), making it one of the more compact homes locally. Across 2013–2022, sale prices on this property compounded at 3% per year. Today's modelled estimate of £215,000 is 16.2% above the 2022 sale price. On a £-per-square-foot basis, the last sale (£324/sq ft) was about 31.3% above the typical sold price in the postcode. Last sale on file: £185,000 in January 2022. That sale was during the post-pandemic price surge, when transactions cleared materially above pre-2020 trend.