| 16, Sibley Avenue, Harpenden | Freehold | 116 m² | £665,000 (2018) |
| 18, Sibley Avenue, Harpenden | Freehold | 116 m² | £452,000 (2010) |
| 19, Sibley Avenue, Harpenden | Freehold | 75 m² | £425,000 (2010) |
| 20, Sibley Avenue, Harpenden | Freehold | 146 m² | £750,000 (2020) |
| 22, Sibley Avenue, Harpenden | Freehold | 194 m² | £585,000 (2018) |
| 24 Sibley Avenue, Harpenden, Harpenden | Freehold | 140 m² | £710,000 (2021) |
| 26 Sibley Avenue, Harpenden | Freehold | 137 m² | £945,000 (2022) |
| 27 Sibley Avenue, Harpenden | Freehold | 95 m² | £500,000 (2023) |
| 28 Sibley Avenue, Harpenden | Freehold | 138 m² | £793,650 (2025) |
| 30 Sibley Avenue, Harpenden | Freehold | 127 m² | £245,000 (2001) |
| 31, Sibley Avenue, Harpenden | Freehold | 155 m² | £756,000 (2019) |
| 33 Sibley Avenue, Harpenden, Harpenden | - | 96 m² | - |
| 34 Sibley Avenue, Harpenden | Freehold | 108 m² | £755,000 (2022) |
| 36 Sibley Avenue, Harpenden | Freehold | 175 m² | £1,205,000 (2023) |
| 37 Sibley Avenue, Harpenden | - | 112 m² | - |
| 40, Sibley Avenue, Harpenden | Freehold | 136 m² | £895,000 (2018) |
| 41, Sibley Avenue, Harpenden | Freehold | 189 m² | £875,000 (2014) |
| 42, Sibley Avenue, Harpenden | - | 84 m² | - |
| 43 Sibley Avenue, Harpenden | Freehold | 116 m² | £845,000 (2023) |
| 44 Sibley Avenue, Harpenden, Harpenden | Freehold | 64 m² | £660,000 (2022) |
| 45, Sibley Avenue, Harpenden | Freehold | 186 m² | £1,350,000 (2024) |
| 47 Sibley Avenue, Harpenden | Freehold | 155 m² | £287,000 (2000) |
| 51, Sibley Avenue, Harpenden | Freehold | 163 m² | £650,000 (2010) |
| 53, Sibley Avenue, Harpenden | Freehold | 98 m² | £485,000 (2006) |
| 55, Sibley Avenue, Harpenden | - | 93 m² | - |
| 57 Sibley Avenue, Harpenden | Freehold | 158 m² | £1,105,000 (2025) |
| 59 Sibley Avenue, Harpenden | Freehold | 113 m² | £1,100,000 (2025) |