| 8 Knightsbridge Court, Observer Drive, Watford, Watford | Leasehold | 71 m² | £335,000 (2021) |
| Flat 1 Knightsbridge Court, Observer Drive, Watford | Leasehold | 66 m² | £281,500 (2021) |
| Flat 2, Knightsbridge Court, Observer Drive, Watford | Leasehold | 74 m² | £230,000 (2005) |
| Flat 3 Knightsbridge Court, Observer Drive, Watford | Leasehold | 73 m² | £325,000 (2018) |
| Flat 4 Knightsbridge Court, Observer Drive, Watford | Leasehold | 69 m² | £292,500 (2019) |
| Flat 5, Knightsbridge Court, Observer Drive, Watford | Leasehold | 76 m² | £328,000 (2021) |
| Flat 6, Knightsbridge Court, Observer Drive, Watford | Leasehold | 68 m² | £249,950 (2014) |
| Flat 7 Knightsbridge Court, Observer Drive, Watford | Leasehold | 91 m² | £345,000 (2016) |
| Flat 9, Knightsbridge Court, Observer Drive, Watford | Leasehold | 71 m² | £345,000 (2024) |
| Flat 10, Knightsbridge Court, Observer Drive, Watford | Leasehold | 75 m² | £237,795 (2005) |
| Flat 11, Knightsbridge Court, Observer Drive, Watford | Leasehold | 70 m² | £226,000 (2010) |
| Flat 12 Knightsbridge Court, Observer Drive, Watford | Leasehold | 86 m² | £375,000 (2021) |
| Flat 13, Knightsbridge Court, Observer Drive, Watford | Leasehold | 68 m² | £365,000 (2022) |
| Flat 14, Knightsbridge Court, Observer Drive, Watford | Leasehold | 70 m² | £243,000 (2014) |
| Flat 15 Knightsbridge Court, Observer Drive, Watford | Leasehold | 79 m² | £322,500 (2021) |
| Flat 16 Knightsbridge Court, Observer Drive, Watford | Leasehold | 70 m² | £344,000 (2025) |
| Flat 17 Knightsbridge Court, Observer Drive, Watford | Leasehold | 86 m² | £358,000 (2022) |
