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

21b is an end-of-terrace house in Upper Brynamman, Ammanford, Ammanford (SA18 1BY). It has a recorded floor area of 52 m² (around 560 sq ft), construction records dating it to before 1900 and council tax band A. At 52 m² this is the 5th 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, with this unit at the top. On EPC score it ranks first in the building (77 versus a worst of 25). The latest certificate (April 2024) shows a C (score 77), near the top of the C band. When first surveyed in June 2009 the rating was F, the property has climbed 3 bands 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 Very Poor to Good.

Today's modelled estimate of £130,000 sits 333.3% above the 2022 sale of £30,000. On a £-per-square-foot basis, the last sale (£54/sq ft) was about 43.2% below the postcode norm. At 52 m² it sits well below the postcode median (83 m² across 29 EPCs), making it one of the more compact homes locally. Its energy rating outperforms most of the postcode (better than 72% 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.