| 1 Northfield Road, Harpenden | - | 36 m² | - |
| 3 Northfield Road, Harpenden | - | 36 m² | - |
| 5 Northfield Road, Harpenden | - | 36 m² | - |
| 7 Northfield Road, Harpenden | - | 36 m² | - |
| 9 Northfield Road, Harpenden | - | 47 m² | - |
| 11 Northfield Road, Harpenden | - | 47 m² | - |
| 13 Northfield Road, Harpenden | - | 47 m² | - |
| 15 Northfield Road, Harpenden | - | 47 m² | - |
| 17 Northfield Road, Harpenden | - | 36 m² | - |
| 19 Northfield Road, Harpenden | - | 36 m² | - |
| 21 Northfield Road, Harpenden | - | 36 m² | - |
| 23 Northfield Road, Harpenden | - | 36 m² | - |
| 25 Northfield Road, Harpenden | - | 36 m² | - |
| 27 Northfield Road, Harpenden | - | 36 m² | - |
| 29 Northfield Road, Harpenden | Leasehold | 36 m² | £155,000 (2015) |
| 31 Northfield Road, Harpenden | - | 36 m² | - |
| 33 Northfield Road, Harpenden | - | 47 m² | - |
| 35 Northfield Road, Harpenden | - | 47 m² | - |
| 37 Northfield Road, Harpenden | - | 47 m² | - |
| 39 Northfield Road, Harpenden | Leasehold | 47 m² | £266,000 (2021) |
| 41 Northfield Road, Harpenden | - | 47 m² | - |
| 43 Northfield Road, Harpenden | Leasehold | 51 m² | £115,800 (2010) |
| 45 Northfield Road, Harpenden | Leasehold | 43 m² | £152,000 (2014) |
| 47 Northfield Road, Harpenden | - | 43 m² | - |
| 49 Northfield Road, Harpenden | Leasehold | 36 m² | £119,500 (2004) |
| 51, Northfield Road, Harpenden | Leasehold | 40 m² | £181,000 (2020) |
| 53 Northfield Road, Harpenden | - | 36 m² | - |
| 55 Northfield Road, Harpenden | - | 36 m² | - |
| 57 Northfield Road, Harpenden | - | 36 m² | - |
| 59 Northfield Road, Harpenden | - | 36 m² | - |
| 61 Northfield Road, Harpenden | Leasehold | 54 m² | £234,000 (2025) |
| 63 Northfield Road, Harpenden | - | 62 m² | - |
| 65 Northfield Road, Harpenden | - | 47 m² | - |
| 69 Northfield Road, Harpenden | - | 36 m² | - |
| 71 Northfield Road, Harpenden | - | 36 m² | - |
| 73 Northfield Road, Harpenden | - | 36 m² | - |
| 75 Northfield Road, Harpenden | - | 36 m² | - |
