| 302 Sigma House, Narrow Lane, Northampton, Northampton | Leasehold | 56 m² | £120,000 (2022) |
| Flat 101, Sigma House, Narrow Lane, Northampton | Leasehold | 76 m² | £121,000 (2023) |
| Flat 103 Sigma House, Narrow Lane, Northampton | Leasehold | 60 m² | £140,602 (2007) |
| Flat 105, Sigma House, Narrow Lane, Northampton | Leasehold | 64 m² | £115,000 (2019) |
| Flat 201 Sigma House, Narrow Lane, Northampton | Leasehold | 65 m² | £107,500 (2015) |
| Flat 202, Sigma House, Narrow Lane, Northampton | Leasehold | 63 m² | £125,000 (2016) |
| Flat 203 Sigma House, Narrow Lane, Northampton | Leasehold | 56 m² | £132,000 (2022) |
| Flat 204 Sigma House, Narrow Lane, Northampton | Leasehold | 67 m² | £120,000 (2017) |
| Flat 205, Sigma House, Narrow Lane, Northampton | Leasehold | 63 m² | £155,995 (2007) |
| Flat 301 Sigma House, Narrow Lane, Northampton | Leasehold | 57 m² | £106,000 (2014) |
| Flat 303 Sigma House, Narrow Lane, Northampton | Leasehold | 66 m² | £115,000 (2016) |
| Flat G3, Sigma House, Narrow Lane, Northampton | Leasehold | 36 m² | £91,000 (2017) |
| Flat G4, Sigma House, Narrow Lane, Northampton | Leasehold | 47 m² | £130,000 (2022) |
| Flat G/1 Sigma House, Narrow Lane, Northampton | Leasehold | 67 m² | £135,000 (2016) |
| Flat G/2 Sigma House, Narrow Lane, Northampton | Leasehold | 63 m² | £132,000 (2016) |
| Flat G/2 Sigma House, Narrow Lane, Northampton | - | 67 m² | - |
| Flat G/5 Sigma House, Narrow Lane, Northampton | Leasehold | 69 m² | £137,000 (2018) |
