| 2, Mountain Street, Caernarfon | - | 54 m² | - |
| 4, Mountain Street, Caernarfon | - | 41 m² | - |
| 6 Mountain Street, Caernarfon, Gwynedd | - | 37 m² | - |
| 8 Mountain Street, Caernarfon, Gwynedd | - | 54 m² | - |
| 10, Mountain Street, Caernarfon | - | 42 m² | - |
| 11, Mountain Street, Caernarfon | Freehold | 66 m² | £125,000 (2025) |
| 12 Mountain Street, Caernarfon, Gwynedd | - | 58 m² | - |
| 13, Mountain Street, Caernarfon | Freehold | 71 m² | £129,500 (2021) |
| 14, Mountain Street, Caernarfon | - | 56 m² | - |
| 15, Mountain Street, Caernarfon | Freehold | 78 m² | £135,000 (2021) |
| 16 Mountain Street, Caernarfon, Caernarfon | - | 52 m² | - |
| 17, Mountain Street, Caernarfon | - | 72 m² | - |
| 18, Mountain Street, Caernarfon | - | 42 m² | - |
| 19 Mountain Street, Caernarfon | Freehold | 70 m² | £107,000 (2010) |
| 20, Mountain Street, Caernarfon | - | 54 m² | - |
| 22 Mountain Street, Caernarfon | - | 40 m² | - |
| 25 Mountain Street, Caernarfon | - | 70 m² | - |
| 27 Mountain Street, Caernarfon, Gwynedd | - | 83 m² | - |
| 29, Mountain Street, Caernarfon | Freehold | 69 m² | £125,000 (2015) |
| 31, Mountain Street, Caernarfon | Freehold | 82 m² | £115,000 (2014) |
| 33, Mountain Street, Caernarfon | Freehold | 76 m² | £110,000 (2021) |
| 35 Mountain Street, Caernarfon | Freehold | 73 m² | £117,500 (2014) |
| 41 Mountain Street, Caernarfon | - | 83 m² | - |
| 43, Mountain Street, Caernarfon | Freehold | 74 m² | £97,500 (2015) |
| 45, Mountain Street, Caernarfon | Freehold | 73 m² | £95,000 (2016) |
| 49, Mountain Street, Caernarfon | Freehold | 72 m² | £125,000 (2020) |
| 51, Mountain Street, Caernarfon | Freehold | 75 m² | £170,000 (2024) |
| 53 Mountain Street, Caernarfon | Freehold | 72 m² | £170,000 (2024) |
| 55, Mountain Street, Caernarfon | - | 51 m² | - |
| 57 Mountain Street, Caernarfon | Freehold | 61 m² | £109,000 (2024) |