4 Ball Lane, Llanrumney, Cardiff, CF3 4JS

4 Ball Lane is a two-bedroom semi-detached house in Llanrumney, Cardiff, Cardiff (CF3 4JS). It has a recorded floor area of 48 m² (around 517 sq ft), construction records dating it to 1950-1966 and council tax band A. The latest certificate (September 2019) shows a D (score 67), on the cusp of jumping into the C band. Earlier certificates rated it C (September 2009); the latest reading is one band lower. Between certificates, lighting went from Very Poor to Very Good; while window efficiency dropped from Good to Average. The recommended improvements would push it to C (score 74). At 48 m² this is the 15th smallest of 22 units on EPC record in the building, where floor areas span 39–103 m². The building's EPC ratings span E to C across 22 units on file.

Untraded for 19 years, with the last transfer in October 2007. That sale landed at the peak of the pre-credit-crunch market, which is a useful reference point when interpreting the price. On energy efficiency it sits in the bottom 10% of properties in this postcode — significant headroom for improvement. On a £-per-square-foot basis, the last sale (£290/sq ft) was about 86% above the typical sold price in the postcode. One planning record on file: subdivision refused in 2013.