6 Berthwin Street, Cardiff, CF11 9JH

6 Berthwin Street is a four-bedroom mid-terrace house in Cardiff (CF11 9JH). It has a recorded floor area of 150 m² (around 1615 sq ft), construction records dating it to before 1900 and council tax band G. The latest certificate (February 2017) shows a D (score 55), a step below the typical UK home. When first surveyed in March 2010 the rating was F, the property has climbed 2 bands since. Between certificates, hot-water efficiency went from Average to Good and main heating went from Average to Good; while lighting dropped from Average to Very Poor. The recommended improvements would push it to C (score 73). Period features are noted in the property record.

3 planning records sit against the property, 2 approved, 0 refused, 1 pending. Past consents include an extension, meaningful when judging how the property has evolved. An active application for an extension is awaiting a decision. Across 1999–2017, sale prices on this property compounded at 15.5% per year. Today's modelled estimate of £708,000 is 29.7% above the 2017 sale price. On a £-per-square-foot basis, the last sale (£338/sq ft) was about 56.2% above the typical sold price in the postcode. Last sold in April 2017, so it's been off the market for around 9 years.