| 26 William Street, Ystradgynlais, Swansea, SA9 1AT | Dec 2025 | £163,000 | Terraced | Freehold |
| 2 William Street, Ystradgynlais, Swansea, SA9 1AT | Jul 2025 | £209,950 | Semi-detached | Freehold |
| Erw Las, 5 William Street, Ystradgynlais, Swansea, SA9 1AT | May 2025 | £140,000 | Terraced | Freehold |
| 20 William Street, Ystradgynlais, Swansea, SA9 1AT | Dec 2023 | £125,000 | Terraced | Freehold |
| 15 William Street, Ystradgynlais, Swansea, SA9 1AT | Mar 2021 | £127,000 | Terraced | Freehold |
| Ty Gardd William Street, Ystradgynlais, Swansea, SA9 1AT | Nov 2019 | £235,000 | Detached | Freehold |
| 3 William Street, Ystradgynlais, Swansea, SA9 1AT | Apr 2019 | £85,000 | Terraced | Freehold |
| 22 William Street, Ystradgynlais, Swansea, SA9 1AT | Sep 2015 | £84,000 | Terraced | Freehold |
| 21 William Street, Ystradgynlais, Swansea, SA9 1AT | Jul 2015 | £73,000 | Terraced | Freehold |
| 19 William Street, Ystradgynlais, Swansea, SA9 1AT | Nov 2013 | £71,000 | Detached | Freehold |
| 6 William Street, Ystradgynlais, Swansea, SA9 1AT | May 2013 | £75,000 | Terraced | Freehold |
| 7 William Street, Ystradgynlais, Swansea, SA9 1AT | Nov 2012 | £82,000 | Terraced | Freehold |
| 4 William Street, Ystradgynlais, Swansea, SA9 1AT | Jul 2009 | £65,000 | Terraced | Freehold |
| 5 William Street, Ystradgynlais, Swansea, SA9 1AT | Jun 2007 | £125,000 | Semi-detached | Freehold |
| 10 William Street, Ystradgynlais, Swansea, SA9 1AT | Apr 2005 | £65,000 | Terraced | Freehold |
| 24 William Street, Ystradgynlais, Swansea, SA9 1AT | Mar 2002 | £34,000 | Terraced | Freehold |
| 1 William Street, Ystradgynlais, Swansea, SA9 1AT | Apr 2001 | £28,000 | Semi-detached | Freehold |
| Tynedale William Street, Ystradgynlais, Swansea, SA9 1AT | Oct 2000 | £65,000 | Semi-detached | Freehold |
| 9 William Street, Ystradgynlais, Swansea, SA9 1AT | Sep 1999 | £27,500 | Terraced | Freehold |
| The Nook William Street, Ystradgynlais, Swansea, SA9 1AT | Jul 1999 | £44,000 | Detached | Freehold |