Marlborough House, Flat 8, Westgate Street, Cardiff, CF10 1DE

Marlborough House is a semi-detached house in Cardiff (CF10 1DE). It has a recorded floor area of 76 m² (around 818 sq ft), construction records dating it to 1930-1949 and council tax band F. At 76 m² this is the 12th smallest of 15 units on EPC record in Marlborough House, where floor areas span 26–90 m². The building's EPC ratings span G to C, with this unit at the top. On EPC score it ranks first in the building (79 versus a worst of 13). The latest certificate (February 2022) shows a C (score 79), near the top of the C band. The rating has held steady at C across 2 certificates since April 2014. Between certificates, window efficiency went from Poor to Average and lighting went from Good to Very Good. The recommended improvements would push it to B (score 81).

Its energy rating outperforms most of the postcode (better than 79% of similar EPCs). Across 2002–2022, sale prices on this property compounded at 1.1% per year. Today's modelled estimate of £246,000 is 23% above the 2022 sale price. On a £-per-square-foot basis, the last sale (£244/sq ft) was about 40.6% above the typical sold price in the postcode. Sold September 2022 for £200,000. That sale was during the post-pandemic price surge, when transactions cleared materially above pre-2020 trend.