| 1, Robert Street, Northampton | Freehold | 129 m² | £155,000 (2007) |
| 3 Robert Street, Northampton | Freehold | 159 m² | £317,500 (2024) |
| 5 Robert Street, Northampton | Freehold | 98 m² | £172,000 (2021) |
| 17 Robert Street, Northampton | Freehold | 150 m² | £155,000 (2002) |
| 19, Robert Street, Northampton | Freehold | 104 m² | £210,000 (2018) |
| 21, Robert Street, Northampton | Freehold | 112 m² | £133,500 (2004) |
| 23, Robert Street, Northampton | Freehold | 77 m² | £128,500 (2013) |
| 35 Robert Street, Northampton, Northampton | Leasehold | 51 m² | £100,000 (2022) |
| 37, Robert Street, Northampton | Freehold | 79 m² | £100,000 (2005) |
| 39 Robert Street, Northampton | Freehold | 71 m² | £128,000 (2006) |
| 43 Robert Street, Northampton | Freehold | 69 m² | £133,500 (2016) |
| 45, Robert Street, Northampton | Freehold | 72 m² | £175,000 (2020) |
| 47 Robert Street, Northampton | Freehold | 71 m² | £172,000 (2017) |
| 49 Robert Street, Northampton | Freehold | 138 m² | £18,000 (1996) |
| Flat 1, The Piano Factory, 25-29 Robert Street, Northampton | - | 52 m² | - |
| Flat 2, The Piano Factory, 25-29 Robert Street, Northampton | - | 59 m² | - |
| Flat 3, The Piano Factory, 25-29 Robert Street, Northampton | - | 45 m² | - |
| Flat 4, The Piano Factory, 25-29 Robert Street, Northampton | - | 44 m² | - |
| Flat 5, The Piano Factory, 25-29 Robert Street, Northampton | - | 49 m² | - |
| Flat 6, The Piano Factory, 25-29 Robert Street, Northampton | - | 42 m² | - |
| Flat 7, The Piano Factory, 25-29 Robert Street, Northampton | - | 45 m² | - |
| Flat 8, The Piano Factory, 25-29 Robert Street, Northampton | - | 52 m² | - |
| Flat 9, The Piano Factory, 25-29 Robert Street, Northampton | - | 48 m² | - |
| Flat 10, The Piano Factory, 25-29 Robert Street, Northampton | - | 49 m² | - |
| Flat 11, The Piano Factory, 25-29 Robert Street, Northampton | - | 42 m² | - |
| Flat 13, The Piano Factory, 25-29 Robert Street, Northampton | - | 43 m² | - |
| Flat 15, The Piano Factory, 25-29 Robert Street, Northampton | - | 48 m² | - |
| Flat 16, The Piano Factory, 25-29 Robert Street, Northampton | - | 49 m² | - |
| Flat 18, The Piano Factory, 25-29 Robert Street, Northampton | - | 48 m² | - |
| Flat 19, The Piano Factory, 25-29 Robert Street, Northampton | - | 44 m² | - |