| Flat 16, Knightsbridge Court Observer Drive, Watford, WD18 7GE | Jun 2025 | £344,000 | Flat / maisonette | Leasehold |
| Flat 9, Knightsbridge Court Observer Drive, Watford, WD18 7GE | Nov 2024 | £345,000 | Flat / maisonette | Leasehold |
| Flat 13, Knightsbridge Court Observer Drive, Watford, WD18 7GE | Jul 2022 | £365,000 | Flat / maisonette | Leasehold |
| Flat 17, Knightsbridge Court Observer Drive, Watford, WD18 7GE | May 2022 | £358,000 | Flat / maisonette | Leasehold |
| Flat 5, Knightsbridge Court Observer Drive, Watford, WD18 7GE | Dec 2021 | £328,000 | Flat / maisonette | Leasehold |
| Flat 8, Knightsbridge Court Observer Drive, Watford, WD18 7GE | Sep 2021 | £335,000 | Flat / maisonette | Leasehold |
| Flat 1, Knightsbridge Court Observer Drive, Watford, WD18 7GE | Jul 2021 | £281,500 | Flat / maisonette | Leasehold |
| Flat 15, Knightsbridge Court Observer Drive, Watford, WD18 7GE | Jun 2021 | £322,500 | Flat / maisonette | Leasehold |
| Flat 12, Knightsbridge Court Observer Drive, Watford, WD18 7GE | May 2021 | £375,000 | Flat / maisonette | Leasehold |
| Flat 4, Knightsbridge Court Observer Drive, Watford, WD18 7GE | Mar 2019 | £292,500 | Flat / maisonette | Leasehold |
| Flat 3, Knightsbridge Court Observer Drive, Watford, WD18 7GE | Aug 2018 | £325,000 | Flat / maisonette | Leasehold |
| Flat 7, Knightsbridge Court Observer Drive, Watford, WD18 7GE | Feb 2016 | £345,000 | Flat / maisonette | Leasehold |
| Flat 6, Knightsbridge Court Observer Drive, Watford, WD18 7GE | Jun 2014 | £249,950 | Flat / maisonette | Leasehold |
| Flat 14, Knightsbridge Court Observer Drive, Watford, WD18 7GE | Mar 2014 | £243,000 | Flat / maisonette | Leasehold |
| Flat 11, Knightsbridge Court Observer Drive, Watford, WD18 7GE | May 2010 | £226,000 | Flat / maisonette | Leasehold |
| Flat 10, Knightsbridge Court Observer Drive, Watford, WD18 7GE | Aug 2005 | £237,795 | Flat / maisonette | Leasehold |
| Flat 2, Knightsbridge Court Observer Drive, Watford, WD18 7GE | Jul 2005 | £230,000 | Flat / maisonette | Leasehold |