| 23 Upper William Street, Llanelli, SA15 1SL | Apr 2026 | £125,000 | Terraced | Freehold |
| 20 Upper William Street, Llanelli, SA15 1SL | Mar 2023 | £90,000 | Terraced | Freehold |
| 21 Upper William Street, Llanelli, SA15 1SL | Mar 2023 | £105,000 | Terraced | Freehold |
| 29 Upper William Street, Llanelli, SA15 1SL | Jul 2022 | £125,000 | Terraced | Freehold |
| 26 Upper William Street, Llanelli, SA15 1SL | Apr 2022 | £43,000 | Other property | Freehold |
| 30 Upper William Street, Llanelli, SA15 1SL | Nov 2018 | £92,500 | Semi-detached | Freehold |
| 15 Upper William Street, Llanelli, SA15 1SL | Oct 2017 | £67,000 | Terraced | Freehold |
| 17 Upper William Street, Llanelli, SA15 1SL | May 2016 | £57,000 | Terraced | Freehold |
| 13 Upper William Street, Llanelli, SA15 1SL | Dec 2007 | £118,000 | Terraced | Leasehold |
| 25 Upper William Street, Llanelli, SA15 1SL | Feb 2007 | £90,000 | Semi-detached | Freehold |
| 18 Upper William Street, Llanelli, SA15 1SL | Oct 2003 | £61,750 | Terraced | Leasehold |
| 19 Upper William Street, Llanelli, SA15 1SL | Dec 2001 | £37,500 | Terraced | Freehold |
| 22 Upper William Street, Llanelli, SA15 1SL | Nov 2000 | £29,500 | Terraced | Freehold |
| 24 Upper William Street, Llanelli, SA15 1SL | Jul 2000 | £27,000 | Terraced | Freehold |
| 14 Upper William Street, Llanelli, SA15 1SL | Feb 2000 | £25,000 | Terraced | Freehold |
| 16 Upper William Street, Llanelli, SA15 1SL | Dec 1999 | £19,500 | Terraced | Freehold |
| 28 Upper William Street, Llanelli, SA15 1SL | Oct 1998 | £35,000 | Terraced | Freehold |