1 Berthwin Street, Cardiff, CF11 9JH

1 Berthwin Street is an end-of-terrace house in Cardiff (CF11 9JH). It has a recorded floor area of 63 m² (around 678 sq ft), construction records dating it to 1900-1929 and council tax band D. At 63 m² this is the smallest unit on EPC record across the building (63–198 m²). The building's EPC ratings span F to C across 12 units on file. The latest certificate (May 2023) shows a D (score 65), on the cusp of jumping into the C band. The rating has held steady at D across 3 certificates since August 2012. Between certificates, wall efficiency went from Very Poor to Poor. The recommended improvements would push it to C (score 77).

Across 1996–2024, sale prices on this property compounded at 9.5% per year. Today's modelled estimate of £202,000 is 62.6% below the 2024 sale of £540,000, an unusual pattern given regional price growth and worth checking against the EPC condition. On a £-per-square-foot basis, the last sale (£796/sq ft) was about 265.8% above the typical sold price in the postcode. At 63 m² it sits well below the postcode median (147 m² across 11 EPCs), making it one of the more compact homes locally. One planning record on file: an extension approved in 2024. Past consents include an extension and solar panel installation, meaningful when judging how the property has evolved. Sold April 2024 for £540,000.