| 2, William Street, Caernarfon | Freehold | 61 m² | £111,000 (2016) |
| 4, William Street, Caernarfon | Freehold | 58 m² | £118,000 (2023) |
| 6, William Street, Caernarfon | Freehold | 57 m² | £79,600 (2004) |
| 8 William Street, Caernarfon | Freehold | 76 m² | £113,000 (2007) |
| 10, William Street, Caernarfon | Freehold | 81 m² | £86,500 (2009) |
| 11, William Street, Caernarfon | Freehold | 94 m² | £110,000 (2021) |
| 12, William Street, Caernarfon | - | 65 m² | - |
| 13 William Street, Caernarfon | Freehold | 74 m² | £46,000 (2002) |
| 14, William Street, Caernarfon | Freehold | 74 m² | £95,000 (2020) |
| 15 William Street, Caernarfon | Freehold | 66 m² | £98,500 (2015) |
| 16, William Street, Caernarfon | Freehold | 77 m² | £107,000 (2006) |
| 17, William Street, Caernarfon | Freehold | 74 m² | £88,000 (2013) |
| 18 William Street, Caernarfon | Freehold | 82 m² | £90,000 (2014) |
| 19, William Street, Caernarfon | Freehold | 65 m² | £37,000 (2000) |
| 20, William Street, Caernarfon | Freehold | 72 m² | £107,500 (2022) |
| 21, William Street, Caernarfon | Freehold | 58 m² | £90,000 (2020) |
| 22 William Street, Caernarfon | Freehold | 62 m² | £98,000 (2011) |
| 25 William Street, Caernarfon | Freehold | 76 m² | £100,000 (2011) |
| 27 William Street, Caernarfon | Freehold | 56 m² | £12,500 (1996) |
| 28, William Street, Caernarfon | Freehold | 76 m² | £90,000 (2024) |
| 29 William Street, Caernarfon | Freehold | 58 m² | £102,000 (2021) |
| 30 William Street, Caernarfon | Freehold | 62 m² | £82,500 (2012) |
| 32, William Street, Caernarfon | Freehold | 64 m² | £95,000 (2019) |
| 33, William Street, Caernarfon | Freehold | 71 m² | £27,000 (1996) |
| 34 William Street, Caernarfon | Freehold | 67 m² | £90,000 (2025) |
| 35, William Street, Caernarfon | Freehold | 55 m² | £77,000 (2005) |
| 36, William Street, Caernarfon | Freehold | 62 m² | £57,000 (2005) |
| 37, William Street, Caernarfon | Freehold | 70 m² | £111,000 (2024) |
| 38, William Street, Caernarfon | Freehold | 63 m² | £85,000 (2013) |
| 39, William Street, Caernarfon | Freehold | 69 m² | £110,000 (2022) |
| 40 William Street, Caernarfon | Freehold | 61 m² | £134,000 (2022) |
| 42, William Street, Caernarfon | - | 70 m² | - |
| 43, William Street, Caernarfon | - | 82 m² | - |
| 45, William Street, Caernarfon | - | 95 m² | - |