3 Lock Keepers Court, Blackweir Terrace, Cardiff, CF10 3EZ

3 Lock Keepers Court is a two-bedroom mid-terrace house in Cardiff (CF10 3EZ). It has a recorded floor area of 75 m² (around 807 sq ft), construction records dating it to 2007 onwards and council tax band E. At 75 m² this is the 3rd smallest of 4 units on EPC record in 3 Lock Keepers Court, where floor areas span 61–81 m². The building's EPC ratings span D to B, with this unit at the bottom. On EPC score it ranks last in the building (68 versus a best of 81). The latest certificate (February 2026) shows a D (score 68), on the cusp of jumping into the C band. Earlier certificates rated it C (August 2009); the latest reading is one band lower. Between certificates, lighting went from Good to Very Good and main heating went from Very Poor to Good; while window efficiency dropped from Good to Average and hot-water efficiency dropped from Very Good to Very Poor. Main heating runs on electricity. This certificate was lodged in the last six months, so the rating reflects current condition.

It hasn't traded since January 2005, a hold of 21 years that's notably long for the area. It lags the bulk of the postcode on energy efficiency (less efficient than 80% of similar EPCs). Today's modelled estimate of £218,000 is 45.3% above the 2005 sale price.