231 Hayes Apartments, The Hayes, Cardiff, CF10 1BQ

231 Hayes Apartments is a one-bedroom mid-terrace house in Cardiff (CF10 1BQ). It has a recorded floor area of 43 m² (around 463 sq ft), construction records dating it to 2007-2011 and council tax band E. The latest certificate (June 2021) returns a high B (score 85), putting the home a stone's throw from an A rating. When first surveyed in June 2011 the rating was C, the property has climbed 1 band since. Between certificates, main heating went from Very Poor to Average; while wall efficiency dropped from Very Good to Good and window efficiency dropped from Very Good to Good. Main heating runs on electricity. At 43 m² this is the 7th smallest of 21 units on EPC record in the building, where floor areas span 39–75 m². The building's EPC ratings span D to B, with this unit at the top. On EPC score it ranks first in the building (85 versus a worst of 68). Other recorded features include a balcony.

At 43 m² it sits well below the postcode median (65 m² across 20 EPCs), making it one of the more compact homes locally. Its energy rating outperforms most of the postcode (better than 80% of similar EPCs). On the market in September 2011 and unlisted since — roughly 15 years. Today's modelled estimate of £145,000 is 26.1% above the 2011 sale price.