| 1B, Langdale Avenue, Harpenden | - | 62 m² | - |
| 2 Langdale Avenue, Harpenden | Freehold | 110 m² | £860,000 (2023) |
| 3, Langdale Avenue, Harpenden | Freehold | 102 m² | £755,100 (2019) |
| 4, Langdale Avenue, Harpenden | Freehold | 75 m² | £580,000 (2020) |
| 5 Langdale Avenue, Harpenden | Freehold | 103 m² | £860,000 (2024) |
| 9 Langdale Avenue, Harpenden | Freehold | 156 m² | £1,170,000 (2024) |
| 10, Langdale Avenue, Harpenden | Freehold | 105 m² | £767,017 (2016) |
| 11 Langdale Avenue, Harpenden, Harpenden | Freehold | 127 m² | £1,000,000 (2023) |
| 12 Langdale Avenue, Harpenden, Harpenden | Freehold | 119 m² | £950,000 (2021) |
| 12A, Langdale Avenue, Harpenden | Freehold | 132 m² | £920,000 (2020) |
| 14, Langdale Avenue, Harpenden | Freehold | 110 m² | £825,000 (2018) |
| 14A, Langdale Avenue, Harpenden | Leasehold | 55 m² | £289,250 (2019) |
| 14B, Langdale Avenue, Harpenden | Leasehold | 52 m² | £64,950 (1997) |
| 15, Langdale Avenue, Harpenden | Freehold | 114 m² | £315,000 (2000) |
| 17 Langdale Avenue, Harpenden | Freehold | 106 m² | £745,000 (2023) |
| 19, Langdale Avenue, Harpenden | Freehold | 91 m² | £610,000 (2015) |
| 20, Langdale Avenue, Harpenden | Freehold | 108 m² | £537,500 (2012) |
| 21, Langdale Avenue, Harpenden | Freehold | 85 m² | £659,000 (2018) |
| 23, Langdale Avenue, Harpenden | Freehold | 133 m² | £875,000 (2018) |
| 26, Langdale Avenue, Harpenden | Freehold | 114 m² | £840,000 (2019) |
| 28 Langdale Avenue, Harpenden | Freehold | 85 m² | £215,000 (2001) |
| 29, Langdale Avenue, Harpenden | Freehold | 110 m² | £293,300 (2003) |
| 30 Langdale Avenue, Harpenden, Harpenden | Freehold | 110 m² | £810,000 (2021) |
| 31, Langdale Avenue, Harpenden | - | 95 m² | - |
| 32, Langdale Avenue, Harpenden | Freehold | 85 m² | £750,000 (2021) |