| 1D Cowper Street, Northampton | - | 34 m² | - |
| 6, Cowper Street, Northampton | - | 22 m² | - |
| 8 Cowper Street, Northampton | Freehold | 147 m² | £212,500 (2018) |
| 9 Cowper Street, Northampton | - | 131 m² | - |
| 10, Cowper Street, Northampton | Freehold | 141 m² | £249,995 (2018) |
| 11 Cowper Street, Northampton | Freehold | 88 m² | £150,000 (2016) |
| 12, Cowper Street, Northampton | Freehold | 138 m² | £190,000 (2014) |
| 13 Cowper Street, Northampton | Freehold | 102 m² | £180,000 (2023) |
| 15 Cowper Street, Northampton | Freehold | 90 m² | £232,000 (2026) |
| 16 Cowper Street, Northampton | Freehold | 122 m² | £120,000 (2003) |
| 17A Cowper Street, Northampton | Freehold | 53 m² | £186,000 (2023) |
| 18, Cowper Street, Northampton | Freehold | 152 m² | £275,000 (2017) |
| 19 Cowper Street, Northampton, Northampton | Freehold | 114 m² | £250,000 (2024) |
| 21, Cowper Street, Northampton | Freehold | 100 m² | £210,000 (2021) |
| 23 Cowper Street, Northampton | Freehold | 81 m² | £125,500 (2006) |
| 24 Cowper Street, Northampton | - | 83 m² | - |
| 25 Cowper Street, Northampton | Freehold | 90 m² | £135,500 (2007) |
| 26A, Cowper Street, Northampton | - | 64 m² | - |
| 26B, Cowper Street, Northampton | - | 72 m² | - |
| 27, Cowper Street, Northampton | Freehold | 87 m² | £167,500 (2016) |
| 29, Cowper Street, Northampton | Freehold | 112 m² | £240,000 (2024) |
| 30, Cowper Street, Northampton | Freehold | 91 m² | £115,000 (2006) |
| 32, Cowper Street, Northampton | Freehold | 87 m² | £157,500 (2014) |
| 35, Cowper Street, Northampton | Freehold | 94 m² | £185,000 (2018) |
| 36 Cowper Street, Northampton | Freehold | 102 m² | £147,000 (2016) |
| 37, Cowper Street, Northampton | Freehold | 90 m² | £140,000 (2017) |
| 38, Cowper Street, Northampton | Freehold | 80 m² | £182,000 (2023) |
| 40 Cowper Street, Northampton, Northampton | Freehold | 100 m² | £230,000 (2021) |
| 41 Cowper Street, Northampton | - | 86 m² | - |
| 42 Cowper Street, Northampton | Freehold | 130 m² | £250,000 (2023) |
| 43, Cowper Street, Northampton | - | 84 m² | - |
| 44, Cowper Street, Northampton | - | 100 m² | - |
| 45, Cowper Street, Northampton | Freehold | 78 m² | £196,000 (2024) |
| 46, Cowper Street, Northampton | Freehold | 97 m² | £180,950 (2017) |
| 47, Cowper Street, Northampton | Freehold | 113 m² | £220,500 (2016) |
| 49, Cowper Street, Northampton | Freehold | 84 m² | £115,500 (2012) |
| 51 Cowper Street, Northampton, Northampton | Freehold | 122 m² | £228,000 (2026) |
| 52, Cowper Street, Northampton | Freehold | 100 m² | £190,500 (2018) |
| 54, Cowper Street, Northampton | Freehold | 99 m² | £197,000 (2018) |
| 55, Cowper Street, Northampton | Freehold | 92 m² | £90,000 (2009) |
| 59, Cowper Street, Northampton | Freehold | 87 m² | £134,000 (2007) |
| 62, Cowper Street, Northampton | Freehold | 122 m² | £120,000 (2007) |
| 64, Cowper Street, Northampton | Freehold | 87 m² | £163,000 (2020) |
| 66, Cowper Street, Northampton | Freehold | 91 m² | £170,000 (2018) |
| 68, Cowper Street, Northampton | Freehold | 91 m² | £185,000 (2017) |
| 70, Cowper Street, Northampton | Freehold | 89 m² | £140,000 (2016) |
| 72, Cowper Street, Northampton | Freehold | 94 m² | £125,000 (2026) |
| 74-76 Cowper Street, Northampton | - | 136 m² | - |
| Flat 1, 1 Cowper Street, Northampton | Freehold | 41 m² | £240,000 (2006) |
| Flat 1, 14 Cowper Street, Northampton | - | 63 m² | - |
| Flat 1, 47 Cowper Street, Northampton | - | 20 m² | - |
| Flat 1, 78, Cowper Street, Northampton | Leasehold | 74 m² | £170,000 (2023) |
| Flat 2, 1 Cowper Street, Northampton | - | 54 m² | - |
| Flat 2, 14 Cowper Street, Northampton | - | 63 m² | - |
| Flat 2, 47 Cowper Street, Northampton | - | 21 m² | - |
| Flat 2, 78, Cowper Street, Northampton | Leasehold | 74 m² | £160,000 (2022) |
| Flat 3, 1 Cowper Street, Northampton | - | 48 m² | - |
| Flat 3, 47 Cowper Street, Northampton | - | 21 m² | - |
| Flat 3, 78, Cowper Street, Northampton | Leasehold | 80 m² | £170,000 (2022) |
| Flat 4, 1 Cowper Street, Northampton | - | 47 m² | - |
| Flat 4, 47 Cowper Street, Northampton | - | 23 m² | - |
| Flat 4, 78, Cowper Street, Northampton | Leasehold | 47 m² | £101,000 (2016) |
| Flat 5, 78 Cowper Street, Northampton | Leasehold | 26 m² | £90,500 (2021) |
| Flat 6, 78, Cowper Street, Northampton | Leasehold | 18 m² | £90,000 (2007) |
| Flat 8, 78, Cowper Street, Northampton | Leasehold | 26 m² | £180,000 (2022) |
| Flat 9, 78, Cowper Street, Northampton | Leasehold | 54 m² | £136,000 (2005) |
| Flat 10, 78, Cowper Street, Northampton | Leasehold | 31 m² | £100,000 (2006) |
| Flat 11, 78, Cowper Street, Northampton | Leasehold | 36 m² | £125,000 (2022) |
| Flat 12, 78, Cowper Street, Northampton | Leasehold | 28 m² | £90,000 (2007) |
| Flat 13, 78 Cowper Street, Northampton | Leasehold | 23 m² | £80,000 (2006) |
| Flat 14, 78 Cowper Street, Northampton | Leasehold | 29 m² | £80,000 (2006) |
| Flat 15, Cowper Factory, 78 Cowper Street, Northampton | Leasehold | 46 m² | £164,000 (2023) |
| Flat 16, 78 Cowper Street, Northampton | Leasehold | 58 m² | £162,000 (2025) |
| Flat 17, 78, Cowper Street, Northampton | Leasehold | 33 m² | £95,000 (2019) |
| Flat 18, 78, Cowper Street, Northampton | Leasehold | 36 m² | £130,000 (2022) |
| Ground Floor Flat, 61 Cowper Street, Northampton | Freehold | 52 m² | £55,950 (2002) |