21a, Cwmgarw Road, Upper Brynamman, Ammanford, SA18 1BY

21a is a semi-detached house in Upper Brynamman, Ammanford, Ammanford (SA18 1BY). It has a recorded floor area of 50 m² (around 538 sq ft), construction records dating it to before 1900 and council tax band A. The latest certificate (March 2014) shows an E (score 44), well below the UK norm with real room to improve. When first surveyed in June 2009 the rating was F, the property has climbed 1 band since. Between certificates, wall efficiency went from Very Poor to Good, window efficiency went from Very Poor to Average and hot-water efficiency went from Poor to Average; while roof efficiency dropped from Average to Very Poor. The recommended improvements would lift it to C (score 77), a 2-band jump. Main heating runs on electricity. The latest certificate is from March 2014, so improvements made since then won't be reflected. At 50 m² this is the 4th smallest of 30 units on EPC record in the building, where floor areas span 45–274 m². The building's EPC ratings span F to C across 30 units on file.

Across 2004–2022, sale prices on this property compounded at -5.1% per year. Today's modelled estimate of £118,000 sits 293.3% above the 2022 sale of £30,000. On a £-per-square-foot basis, the last sale (£56/sq ft) was about 27.5% below the postcode norm. At 50 m² it sits well below the postcode median (83 m² across 29 EPCs), making it one of the more compact homes locally. It lags the bulk of the postcode on energy efficiency (less efficient than 79% of similar EPCs). Sold April 2022 for £30,000. That sale was during the post-pandemic price surge, when transactions cleared materially above pre-2020 trend.