| 1 Oldcastle Avenue, Guilsfield, Welshpool | Freehold | 87 m² | £260,000 (2022) |
| 2, Oldcastle Avenue, Guilsfield, Welshpool | Freehold | 80 m² | £230,000 (2022) |
| 3 Oldcastle Avenue, Guilsfield, Welshpool | Freehold | 76 m² | £230,000 (2024) |
| 5 Oldcastle Avenue, Guilsfield, Welshpool | Freehold | 86 m² | £275,000 (2026) |
| 6 Oldcastle Avenue, Guilsfield, Welshpool | Freehold | 78 m² | £70,000 (1999) |
| 8 Oldcastle Avenue, Guilsfield, Welshpool | Freehold | 81 m² | £168,000 (2008) |
| 9 Oldcastle Avenue, Guilsfield, Welshpool | Freehold | 95 m² | £275,000 (2026) |
| 11 Oldcastle Avenue, Guilsfield, Welshpool | Freehold | 77 m² | £230,000 (2026) |
| 12 Oldcastle Avenue, Guilsfield, Welshpool | Freehold | 92 m² | £90,000 (2001) |
| 14, Oldcastle Avenue, Guilsfield, Welshpool | Freehold | 103 m² | £187,500 (2010) |
| 15, Oldcastle Avenue, Guilsfield, Welshpool | Freehold | 103 m² | £185,000 (2014) |
| 16 Oldcastle Avenue, Guilsfield, Welshpool | Freehold | 78 m² | £230,000 (2024) |
| 18, Oldcastle Avenue, Guilsfield, Welshpool | Freehold | 73 m² | £150,000 (2018) |
| 20, Oldcastle Avenue, Guilsfield, Welshpool | Freehold | 83 m² | £170,000 (2014) |
| 22, Oldcastle Avenue, Guilsfield, Welshpool | Freehold | 76 m² | £255,000 (2026) |
| 24, Oldcastle Avenue, Guilsfield, Welshpool | Freehold | 92 m² | £166,500 (2010) |
| 25 Oldcastle Avenue, Guilsfield, Welshpool | Freehold | 74 m² | £230,000 (2026) |
| 27, Oldcastle Avenue, Guilsfield, Welshpool | Freehold | 75 m² | £220,000 (2023) |
| 28 Oldcastle Avenue, Guilsfield, Welshpool | Freehold | 85 m² | £280,000 (2025) |
| 29 Oldcastle Avenue, Guilsfield, Welshpool | Freehold | 87 m² | £70,000 (1998) |
| 31 Oldcastle Avenue, Guilsfield, Welshpool | Freehold | 91 m² | £281,500 (2022) |
| 32 Oldcastle Avenue, Guilsfield, Welshpool | Freehold | 77 m² | £150,000 (2009) |
| 34 Oldcastle Avenue, Guilsfield, Welshpool | Freehold | 68 m² | £220,000 (2024) |
| 35, Oldcastle Avenue, Guilsfield, Welshpool | Freehold | 111 m² | £215,500 (2017) |
| 36 Oldcastle Avenue, Guilsfield, Welshpool | Freehold | 109 m² | £71,000 (1998) |
| 37, Oldcastle Avenue, Guilsfield, Welshpool | Freehold | 136 m² | £260,000 (2018) |
| 40, Oldcastle Avenue, Guilsfield, Welshpool | Freehold | 84 m² | £212,500 (2018) |
| 42, Oldcastle Avenue, Guilsfield, Welshpool | Freehold | 88 m² | £180,000 (2013) |
| 52, Oldcastle Avenue, Guilsfield, Welshpool | Freehold | 89 m² | £195,000 (2012) |