| 3 St. Seiriols Close, Caergybi, Ynys Mon | - | 71 m² | - |
| 4 St. Seiriols Close, Holyhead | Freehold | 74 m² | £117,000 (2025) |
| 5 St. Seiriols Close, Caergybi, Ynys Mon | - | 71 m² | - |
| 6 St. Seiriols Close, Holyhead | Freehold | 73 m² | £129,000 (2024) |
| 9 St. Seiriols Close, Caergybi, Ynys Mon | - | 37 m² | - |
| 10 St. Seiriols Close, Caergybi, Ynys Mon | - | 68 m² | - |
| 11, St. Seiriols Close, Holyhead | - | 40 m² | - |
| 12 St. Seiriols Close, Caergybi, Ynys Mon | - | 69 m² | - |
| 13 St. Seiriols Close, Caergybi, Ynys Mon | - | 37 m² | - |
| 15 St. Seiriols Close, Caergybi, Ynys Mon | - | 42 m² | - |
| 16, St. Seiriols Close, Holyhead | - | 71 m² | - |
| 17, St. Seiriols Close, Holyhead | - | 38 m² | - |
| 19 St. Seiriols Close, Caergybi, Ynys Mon | - | 37 m² | - |
| 20 St. Seiriols Close, Caergybi, Ynys Mon | - | 69 m² | - |
| 21 St. Seiriols Close, Caergybi, Ynys Mon | - | 37 m² | - |
| 22 St. Seiriols Close, Caergybi, Ynys Mon | - | 69 m² | - |
| 23 St. Seiriols Close, Caergybi, Ynys Mon | - | 37 m² | - |
| 24 St. Seiriols Close, Holyhead | Leasehold | 72 m² | £71,000 (2024) |
| 25A, St. Seiriols Close, Holyhead | - | 60 m² | - |
| 26 St. Seiriols Close, Holyhead | Freehold | 90 m² | £103,000 (2023) |
| 27 St Seiriols Close, Holyhead, Holyhead | Freehold | 77 m² | £127,200 (2021) |
| 28 St Seiriols Close, Holyhead, Holyhead | - | 95 m² | - |
| 29, St. Seiriols Close, Holyhead | - | 94 m² | - |
| 30, St. Seiriols Close, Holyhead | - | 94 m² | - |
| 31 St. Seiriols Close, Holyhead | Freehold | 79 m² | £115,000 (2023) |
| 32, St. Seiriols Close, Holyhead | - | 94 m² | - |
| 33, St. Seiriols Close, Holyhead | Freehold | 91 m² | £130,000 (2018) |
| 37 St. Seiriols Close, Holyhead | Freehold | 78 m² | £125,000 (2023) |