584a, Old Chester Road, Birkenhead, CH42 4NW

584a is a one-bedroom mid-terrace house in Birkenhead (CH42 4NW). It has a recorded floor area of 42 m² (around 452 sq ft), construction records dating it to 1900-1929 and council tax band A. The latest certificate (July 2016) shows a D (score 64), on the cusp of jumping into the C band. Earlier certificates rated it C (February 2010); the latest reading is one band lower. Between certificates, window efficiency went from Very Poor to Average and lighting went from Very Poor to Very Good. The recommended improvements would push it to C (score 75). At 42 m² this is the 4th smallest of 13 units on EPC record in the building, where floor areas span 34–251 m². The building's EPC ratings span F to C across 13 units on file. Other recorded features include a basement.

Untraded for 16 years, with the last transfer in March 2010. Today's modelled estimate of £108,000 sits 87.8% above the 2010 sale of £57,500. On a £-per-square-foot basis, the last sale (£127/sq ft) was about 172.7% above the typical sold price in the postcode. At 42 m² it sits well below the postcode median (71 m² across 12 EPCs), making it one of the more compact homes locally.