18 William Street, Brynna, Pontyclun, CF72 9QJ

18 William Street is a three-bedroom mid-terrace house in Brynna, Pontyclun, Pontyclun (CF72 9QJ). It has a recorded floor area of 81 m² (around 872 sq ft), construction records dating it to 1950-1966 and council tax band B. The latest certificate (August 2019) shows an E (score 49), well below the UK norm with real room to improve. The rating has held steady at E across 2 certificates since November 2008. Between certificates, hot-water efficiency went from Poor to Average, lighting went from Poor to Very Good and main heating went from Average to Good; while wall efficiency dropped from Good to Poor and roof efficiency dropped from Average to Very Poor. The recommended improvements would lift it to C (score 79), a 2-band jump. Our model identifies extension potential, subject to local planning policy.

Held since December 2008 — that's 17 years off the open market, well above the local norm. That sale landed at the peak of the pre-credit-crunch market, which is a useful reference point when interpreting the price. Today's modelled estimate of £174,000 sits 74% above the 2008 sale of £100,000. On a £-per-square-foot basis, the last sale (£115/sq ft) was about 19.9% above the typical sold price in the postcode. It lags the bulk of the postcode on energy efficiency (less efficient than 72% of similar EPCs).