| 1, Grantham Avenue, Seaham | - | 48 m² | - |
| 2 Grantham Avenue, Seaham | Freehold | 77 m² | £105,000 (2006) |
| 3 Grantham Avenue, Seaham | - | 61 m² | - |
| 5 Grantham Avenue, Seaham | - | 54 m² | - |
| 6, Grantham Avenue, Seaham | Freehold | 53 m² | £77,000 (2018) |
| 7, Grantham Avenue, Seaham | Freehold | 48 m² | £80,000 (2006) |
| 9 Grantham Avenue, Seaham | - | 53 m² | - |
| 10, Grantham Avenue, Seaham | - | 54 m² | - |
| 11, Grantham Avenue, Seaham | - | 53 m² | - |
| 12, Grantham Avenue, Seaham | Freehold | 53 m² | £52,500 (2012) |
| 13, Grantham Avenue, Seaham | - | 45 m² | - |
| 14 Grantham Avenue, Seaham | - | 50 m² | - |
| 15, Grantham Avenue, Seaham | Freehold | 53 m² | £83,000 (2021) |
| 16 Grantham Avenue, Seaham | - | 54 m² | - |
| 17 Grantham Avenue, Seaham | Freehold | 88 m² | £145,000 (2025) |
| 18 Grantham Avenue, Seaham | - | 55 m² | - |
| 19, Grantham Avenue, Seaham | Freehold | 53 m² | £81,000 (2006) |
| 20 Grantham Avenue, Seaham | - | 52 m² | - |
| 22, Grantham Avenue, Seaham | Freehold | 59 m² | £125,000 (2023) |
| 23 Grantham Avenue, Seaham | Freehold | 52 m² | £90,000 (2021) |
| 24 Grantham Avenue, Seaham, Seaham | Freehold | 50 m² | £36,000 (2012) |
| 25 Grantham Avenue, Seaham | Freehold | 55 m² | £115,000 (2026) |
| 26 Grantham Avenue, Seaham | Freehold | 52 m² | £70,000 (2026) |
| 27 Grantham Avenue, Seaham | Freehold | 52 m² | £60,500 (2024) |
| 28, Grantham Avenue, Seaham | - | 55 m² | - |
| 29, Grantham Avenue, Seaham | - | 54 m² | - |
| 30, Grantham Avenue, Seaham | - | 45 m² | - |
| 31 Grantham Avenue, Seaham | Freehold | 48 m² | £83,000 (2025) |
| 32, Grantham Avenue, Seaham | - | 53 m² | - |
