31 33, Flat 3, Colum Road, Cardiff, CF10 3EE

31 33 is a seven-bedroom semi-detached house in Cardiff (CF10 3EE). It has a recorded floor area of 42 m² (around 452 sq ft), construction records dating it to 1900-1929 and council tax band H. At 42 m² this is the 3rd smallest of 10 units on EPC record in 31 33, where floor areas span 37–53 m². The building's EPC ratings span E to C, with this unit at the bottom. The latest certificate (September 2024) shows an E (score 53), well below the UK norm with real room to improve. The rating has held steady at E across 3 certificates since May 2018. Between certificates, lighting went from Very Poor to Very Good and main heating went from Very Poor to Average; while window efficiency dropped from Good to Average. The recommended improvements would lift it to C (score 71), a 2-band jump. Main heating runs on electricity.

Untraded for 28 years, with the last transfer in August 1998. Only one transfer is on record with HM Land Registry, suggesting it has stayed in the same hands for a long time. Today's modelled estimate of £453,000 sits 443.8% above the 1998 sale of £83,300. On a £-per-square-foot basis, the last sale (£184/sq ft) was about 31.3% above the typical sold price in the postcode. It lags the bulk of the postcode on energy efficiency (less efficient than 86% of similar EPCs).