| Flat 1, Gloucester Court, Observer Drive, Watford | Leasehold | 48 m² | £220,000 (2025) |
| Flat 2 Gloucester Court, Observer Drive, Watford | Leasehold | 56 m² | £131,000 (2016) |
| Flat 3 Gloucester Court, Observer Drive, Watford | Leasehold | 53 m² | £237,000 (2026) |
| Flat 4 Gloucester Court, Observer Drive, Watford | Leasehold | 53 m² | £245,000 (2020) |
| Flat 5, Gloucester Court, Observer Drive, Watford | Leasehold | 49 m² | £198,000 (2015) |
| Flat 6, Gloucester Court, Observer Drive, Watford | Leasehold | 53 m² | £230,000 (2025) |
| Flat 7 Gloucester Court, Observer Drive, Watford | Leasehold | 53 m² | £230,000 (2020) |
| Flat 8, Gloucester Court, Observer Drive, Watford | Leasehold | 52 m² | £82,500 (2007) |
| Flat 9, Gloucester Court, Observer Drive, Watford | - | 65 m² | - |
| Flat 10 Gloucester Court, Observer Drive, Watford | - | 52 m² | - |
| Flat 11 Gloucester Court, Observer Drive, Watford | - | 52 m² | - |
| Flat 12, Gloucester Court, Observer Drive, Watford | - | 88 m² | - |
| Flat 13, Gloucester Court, Observer Drive, Watford | - | 64 m² | - |
| Flat 14, Gloucester Court, Observer Drive, Watford | - | 65 m² | - |
| Flat 15, Gloucester Court, Observer Drive, Watford | - | 51 m² | - |
| Flat 16, Gloucester Court, Observer Drive, Watford | - | 56 m² | - |
| Flat 17, Gloucester Court, Observer Drive, Watford | - | 65 m² | - |
| Flat 18, Gloucester Court, Observer Drive, Watford | - | 69 m² | - |
| Flat 19, Gloucester Court, Observer Drive, Watford | - | 65 m² | - |
| Flat 20 Gloucester Court, Observer Drive, Watford | - | 52 m² | - |
| Flat 22, Gloucester Court, Observer Drive, Watford | - | 54 m² | - |
| Flat 23, Gloucester Court, Observer Drive, Watford | - | 65 m² | - |
| Flat 24 Gloucester Court, Observer Drive, Watford | - | 66 m² | - |
| Flat 25, Gloucester Court, Observer Drive, Watford | - | 69 m² | - |
| Flat 26, Gloucester Court, Observer Drive, Watford | - | 53 m² | - |
| Flat 27, Gloucester Court, Observer Drive, Watford | - | 69 m² | - |
| Flat 28, Gloucester Court, Observer Drive, Watford | - | 65 m² | - |