| 24 Apr 2026 | GLOUCESTER COURT, FLAT 3, OBSERVER DRIVE | Flat | Leasehold | £237,000 |
| 27 Nov 2025 | 4, OBSERVER DRIVE | Terraced | Freehold | £515,000 |
| 11 Nov 2025 | MAYFAIR COURT, FLAT 8, OBSERVER DRIVE | Flat | Leasehold | £290,000 |
| 3 Jul 2025 | GLOUCESTER COURT, FLAT 1, OBSERVER DRIVE | Flat | Leasehold | £220,000 |
| 20 Jun 2025 | KNIGHTSBRIDGE COURT, FLAT 16, OBSERVER DRIVE | Flat | Leasehold | £344,000 |
| 15 May 2025 | MAYFAIR COURT, FLAT 23, OBSERVER DRIVE | Flat | Leasehold | £305,000 |
| 28 Mar 2025 | GLOUCESTER COURT, FLAT 6, OBSERVER DRIVE | Flat | Leasehold | £230,000 |
| 6 Jan 2025 | MAYFAIR COURT, FLAT 24, OBSERVER DRIVE | Flat | Leasehold | £340,000 |
| 26 Nov 2024 | KNIGHTSBRIDGE COURT, FLAT 9, OBSERVER DRIVE | Flat | Leasehold | £345,000 |
| 16 Aug 2024 | MAYFAIR COURT, FLAT 10, OBSERVER DRIVE | Flat | Leasehold | £340,000 |
| 25 Jun 2024 | 3, OBSERVER DRIVE | Detached | Freehold | £710,000 |
| 28 Nov 2023 | MAYFAIR COURT, FLAT 11, OBSERVER DRIVE | Flat | Leasehold | £322,000 |
| 4 Nov 2022 | MAYFAIR COURT, FLAT 3, OBSERVER DRIVE | Flat | Leasehold | £335,000 |
| 28 Jul 2022 | KNIGHTSBRIDGE COURT, FLAT 13, OBSERVER DRIVE | Flat | Leasehold | £365,000 |
| 3 May 2022 | KNIGHTSBRIDGE COURT, FLAT 17, OBSERVER DRIVE | Flat | Leasehold | £358,000 |
| 9 Dec 2021 | KNIGHTSBRIDGE COURT, FLAT 5, OBSERVER DRIVE | Flat | Leasehold | £328,000 |
| 29 Oct 2021 | MAYFAIR COURT, FLAT 29, OBSERVER DRIVE | Flat | Leasehold | £325,000 |
| 28 Sep 2021 | KNIGHTSBRIDGE COURT, FLAT 8, OBSERVER DRIVE | Flat | Leasehold | £335,000 |
| 6 Sep 2021 | GLOUCESTER COURT, FLAT 3, OBSERVER DRIVE | Flat | Leasehold | £237,500 |
| 23 Jul 2021 | KNIGHTSBRIDGE COURT, FLAT 1, OBSERVER DRIVE | Flat | Leasehold | £281,500 |
| 18 Jun 2021 | KNIGHTSBRIDGE COURT, FLAT 15, OBSERVER DRIVE | Flat | Leasehold | £322,500 |
| 14 May 2021 | KNIGHTSBRIDGE COURT, FLAT 12, OBSERVER DRIVE | Flat | Leasehold | £375,000 |
| 25 Mar 2021 | MAYFAIR COURT, FLAT 28, OBSERVER DRIVE | Flat | Leasehold | £320,000 |
| 10 Dec 2020 | GLOUCESTER COURT, FLAT 4, OBSERVER DRIVE | Flat | Leasehold | £245,000 |
| 9 Jul 2020 | GLOUCESTER COURT, FLAT 7, OBSERVER DRIVE | Flat | Leasehold | £230,000 |
| 17 Apr 2020 | MAYFAIR COURT, FLAT 18, OBSERVER DRIVE | Flat | Leasehold | £332,000 |
| 22 Mar 2019 | KNIGHTSBRIDGE COURT, FLAT 4, OBSERVER DRIVE | Flat | Leasehold | £292,500 |
| 8 Jan 2019 | GLOUCESTER COURT, FLAT 6, OBSERVER DRIVE | Flat | Leasehold | £231,500 |
| 3 Dec 2018 | MAYFAIR COURT, FLAT 13, OBSERVER DRIVE | Flat | Leasehold | £337,000 |
| 10 Aug 2018 | KNIGHTSBRIDGE COURT, FLAT 3, OBSERVER DRIVE | Flat | Leasehold | £325,000 |
| 27 Jan 2017 | 7, OBSERVER DRIVE | Terraced | Freehold | £595,000 |
| 29 Nov 2016 | KNIGHTSBRIDGE COURT, FLAT 16, OBSERVER DRIVE | Flat | Leasehold | £369,950 |
| 12 Aug 2016 | GLOUCESTER COURT, FLAT 2, OBSERVER DRIVE | Flat | Leasehold | £131,000 |
| 26 Feb 2016 | KNIGHTSBRIDGE COURT, FLAT 7, OBSERVER DRIVE | Flat | Leasehold | £345,000 |
| 3 Nov 2015 | MAYFAIR COURT, FLAT 23, OBSERVER DRIVE | Flat | Leasehold | £315,000 |
| 13 Oct 2015 | GLOUCESTER COURT, FLAT 4, OBSERVER DRIVE | Flat | Leasehold | £222,000 |
| 23 Sep 2015 | MAYFAIR COURT, FLAT 19, OBSERVER DRIVE | Flat | Leasehold | £300,000 |
| 28 May 2015 | GLOUCESTER COURT, FLAT 5, OBSERVER DRIVE | Flat | Leasehold | £198,000 |
| 23 Feb 2015 | MAYFAIR COURT, FLAT 4, OBSERVER DRIVE | Flat | Leasehold | £286,000 |
| 12 Feb 2015 | 9, OBSERVER DRIVE | Terraced | Freehold | £495,000 |
| 3 Dec 2014 | KNIGHTSBRIDGE COURT, FLAT 17, OBSERVER DRIVE | Flat | Leasehold | £305,000 |
| 18 Jul 2014 | GLOUCESTER COURT, FLAT 6, OBSERVER DRIVE | Flat | Leasehold | £190,000 |
| 27 Jun 2014 | KNIGHTSBRIDGE COURT, FLAT 6, OBSERVER DRIVE | Flat | Leasehold | £249,950 |
| 30 May 2014 | GLOUCESTER COURT, FLAT 1, OBSERVER DRIVE | Flat | Leasehold | £165,000 |
| 11 Apr 2014 | GLOUCESTER COURT, FLAT 7, OBSERVER DRIVE | Flat | Leasehold | £72,900 |
| 31 Mar 2014 | GLOUCESTER COURT, FLAT 3, OBSERVER DRIVE | Flat | Leasehold | £183,000 |
| 18 Mar 2014 | KNIGHTSBRIDGE COURT, FLAT 14, OBSERVER DRIVE | Flat | Leasehold | £243,000 |
| 29 Nov 2013 | MAYFAIR COURT, FLAT 13, OBSERVER DRIVE | Flat | Leasehold | £243,500 |
| 22 Nov 2013 | MAYFAIR COURT, FLAT 5, OBSERVER DRIVE | Flat | Leasehold | £240,000 |
| 5 Nov 2013 | MAYFAIR COURT, FLAT 9, OBSERVER DRIVE | Flat | Leasehold | £246,000 |
| 11 Oct 2013 | MAYFAIR COURT, FLAT 18, OBSERVER DRIVE | Flat | Leasehold | £243,500 |
| 20 Sep 2013 | GLOUCESTER COURT, FLAT 4, OBSERVER DRIVE | Flat | Leasehold | £158,000 |
| 30 Aug 2013 | MAYFAIR COURT, FLAT 3, OBSERVER DRIVE | Flat | Leasehold | £249,999 |
| 12 Aug 2013 | MAYFAIR COURT, FLAT 19, OBSERVER DRIVE | Flat | Leasehold | £231,500 |
| 16 Apr 2013 | KNIGHTSBRIDGE COURT, FLAT 8, OBSERVER DRIVE | Flat | Leasehold | £235,000 |
| 8 Feb 2013 | MAYFAIR COURT, FLAT 16, OBSERVER DRIVE | Flat | Leasehold | £235,000 |
| 11 Jan 2013 | MAYFAIR COURT, FLAT 29, OBSERVER DRIVE | Flat | Leasehold | £230,000 |
| 8 Jun 2012 | MAYFAIR COURT, FLAT 24, OBSERVER DRIVE | Flat | Leasehold | £225,000 |
| 9 Mar 2012 | MAYFAIR COURT, FLAT 17, OBSERVER DRIVE | Flat | Leasehold | £235,000 |
| 19 Dec 2011 | MAYFAIR COURT, FLAT 7, OBSERVER DRIVE | Flat | Leasehold | £235,000 |
| 8 Nov 2011 | KNIGHTSBRIDGE COURT, FLAT 13, OBSERVER DRIVE | Flat | Leasehold | £238,000 |
| 10 Aug 2011 | 3, OBSERVER DRIVE | Detached | Freehold | £396,000 |
| 16 May 2011 | MAYFAIR COURT, FLAT 4, OBSERVER DRIVE | Flat | Leasehold | £230,000 |
| 24 May 2010 | KNIGHTSBRIDGE COURT, FLAT 11, OBSERVER DRIVE | Flat | Leasehold | £226,000 |
| 18 Mar 2010 | KNIGHTSBRIDGE COURT, FLAT 15, OBSERVER DRIVE | Flat | Leasehold | £230,000 |
| 18 Nov 2009 | GLOUCESTER COURT, FLAT 1, OBSERVER DRIVE | Flat | Leasehold | £147,500 |
| 15 Oct 2009 | MAYFAIR COURT, FLAT 18, OBSERVER DRIVE | Flat | Leasehold | £230,000 |
| 26 May 2009 | GLOUCESTER COURT, FLAT 6, OBSERVER DRIVE | Flat | Leasehold | £81,000 |
| 3 Apr 2009 | 6, OBSERVER DRIVE | Detached | Freehold | £248,750 |
| 11 Jan 2008 | MAYFAIR COURT, FLAT 28, OBSERVER DRIVE, WATFORD | Flat | Leasehold | £247,000 |
| 9 Nov 2007 | KNIGHTSBRIDGE COURT, FLAT 4, OBSERVER DRIVE, WATFORD | Flat | Leasehold | £240,000 |
| 24 Oct 2007 | KNIGHTSBRIDGE COURT, FLAT 5, OBSERVER DRIVE, WATFORD | Flat | Leasehold | £237,500 |
| 10 Aug 2007 | KNIGHTSBRIDGE COURT, FLAT 13, OBSERVER DRIVE, WATFORD | Flat | Leasehold | £249,950 |
| 3 Jul 2007 | GLOUCESTER COURT, FLAT 8, OBSERVER DRIVE, WATFORD | Flat | Leasehold | £82,500 |
| 31 May 2007 | GLOUCESTER COURT, FLAT 2, OBSERVER DRIVE, WATFORD | Flat | Leasehold | £82,500 |
| 16 May 2007 | MAYFAIR COURT, FLAT 26, OBSERVER DRIVE, WATFORD | Flat | Leasehold | £247,000 |
| 9 Jan 2007 | 4, OBSERVER DRIVE, WATFORD | Terraced | Freehold | £320,000 |
| 22 Dec 2006 | KNIGHTSBRIDGE COURT, FLAT 14, OBSERVER DRIVE, WATFORD | Flat | Leasehold | £250,000 |
| 30 Jun 2006 | MAYFAIR COURT, FLAT 19, OBSERVER DRIVE, WATFORD | Flat | Leasehold | £210,000 |
| 26 May 2006 | MAYFAIR COURT, FLAT 17, OBSERVER DRIVE, WATFORD | Flat | Leasehold | £222,000 |
| 26 May 2006 | MAYFAIR COURT, FLAT 14, OBSERVER DRIVE, WATFORD | Flat | Leasehold | £205,000 |
| 25 May 2006 | MAYFAIR COURT, FLAT 15, OBSERVER DRIVE, WATFORD | Flat | Leasehold | £220,000 |
| 28 Apr 2006 | KNIGHTSBRIDGE COURT, FLAT 1, OBSERVER DRIVE, WATFORD | Flat | Leasehold | £220,000 |
| 7 Apr 2006 | MAYFAIR COURT, FLAT 11, OBSERVER DRIVE, WATFORD | Flat | Leasehold | £215,000 |
| 31 Mar 2006 | MAYFAIR COURT, FLAT 30, OBSERVER DRIVE, WATFORD | Flat | Leasehold | £229,500 |
| 31 Mar 2006 | MAYFAIR COURT, FLAT 28, OBSERVER DRIVE, WATFORD | Flat | Leasehold | £208,205 |
| 31 Mar 2006 | MAYFAIR COURT, FLAT 18, OBSERVER DRIVE, WATFORD | Flat | Leasehold | £237,000 |
| 24 Mar 2006 | MAYFAIR COURT, FLAT 29, OBSERVER DRIVE, WATFORD | Flat | Leasehold | £218,775 |
| 23 Mar 2006 | MAYFAIR COURT, FLAT 27, OBSERVER DRIVE, WATFORD | Flat | Leasehold | £247,500 |
| 20 Mar 2006 | MAYFAIR COURT, FLAT 24, OBSERVER DRIVE, WATFORD | Flat | Leasehold | £237,500 |
| 15 Mar 2006 | MAYFAIR COURT, FLAT 26, OBSERVER DRIVE, WATFORD | Flat | Leasehold | £237,500 |
| 24 Feb 2006 | MAYFAIR COURT, FLAT 22, OBSERVER DRIVE, WATFORD | Flat | Leasehold | £242,500 |
| 24 Feb 2006 | MAYFAIR COURT, FLAT 20, OBSERVER DRIVE, WATFORD | Flat | Leasehold | £209,995 |
| 24 Feb 2006 | MAYFAIR COURT, FLAT 21, OBSERVER DRIVE, WATFORD | Flat | Leasehold | £229,500 |
| 24 Feb 2006 | MAYFAIR COURT, FLAT 6, OBSERVER DRIVE, WATFORD | Flat | Leasehold | £240,000 |
| 24 Feb 2006 | MAYFAIR COURT, FLAT 25, OBSERVER DRIVE, WATFORD | Flat | Leasehold | £216,000 |
| 24 Feb 2006 | MAYFAIR COURT, FLAT 12, OBSERVER DRIVE, WATFORD | Flat | Leasehold | £235,000 |
| 24 Feb 2006 | MAYFAIR COURT, FLAT 16, OBSERVER DRIVE, WATFORD | Flat | Leasehold | £243,995 |
| 24 Feb 2006 | MAYFAIR COURT, FLAT 23, OBSERVER DRIVE, WATFORD | Flat | Leasehold | £236,700 |
| 17 Feb 2006 | KNIGHTSBRIDGE COURT, FLAT 11, OBSERVER DRIVE, WATFORD | Flat | Leasehold | £212,000 |
| 3 Feb 2006 | MAYFAIR COURT, FLAT 7, OBSERVER DRIVE, WATFORD | Flat | Leasehold | £232,500 |
| 31 Jan 2006 | MAYFAIR COURT, FLAT 8, OBSERVER DRIVE, WATFORD | Flat | Leasehold | £242,960 |
| 27 Jan 2006 | MAYFAIR COURT, FLAT 10, OBSERVER DRIVE, WATFORD | Flat | Leasehold | £205,000 |
| 27 Jan 2006 | MAYFAIR COURT, FLAT 3, OBSERVER DRIVE, WATFORD | Flat | Leasehold | £215,000 |
| 27 Jan 2006 | MAYFAIR COURT, FLAT 5, OBSERVER DRIVE, WATFORD | Flat | Leasehold | £239,995 |
| 25 Jan 2006 | MAYFAIR COURT, FLAT 1, OBSERVER DRIVE, WATFORD | Flat | Leasehold | £240,000 |
| 20 Jan 2006 | 3, OBSERVER DRIVE, WATFORD | Detached | Freehold | £370,000 |
| 22 Dec 2005 | MAYFAIR COURT, FLAT 13, OBSERVER DRIVE, WATFORD | Flat | Leasehold | £223,325 |
| 22 Dec 2005 | MAYFAIR COURT, FLAT 9, OBSERVER DRIVE, WATFORD | Flat | Leasehold | £226,000 |
| 21 Dec 2005 | MAYFAIR COURT, FLAT 2, OBSERVER DRIVE, WATFORD | Flat | Leasehold | £229,000 |
| 16 Dec 2005 | MAYFAIR COURT, FLAT 4, OBSERVER DRIVE | Flat | Leasehold | £218,000 |
| 16 Dec 2005 | 9, OBSERVER DRIVE, WATFORD | Terraced | Freehold | £340,000 |
| 3 Oct 2005 | KNIGHTSBRIDGE COURT, FLAT 7, OBSERVER DRIVE, WATFORD | Flat | Leasehold | £240,000 |
| 26 Aug 2005 | KNIGHTSBRIDGE COURT, FLAT 16, OBSERVER DRIVE, WATFORD | Flat | Leasehold | £231,935 |
| 26 Aug 2005 | KNIGHTSBRIDGE COURT, FLAT 12, OBSERVER DRIVE, WATFORD | Flat | Leasehold | £249,995 |
| 26 Aug 2005 | KNIGHTSBRIDGE COURT, FLAT 10, OBSERVER DRIVE, WATFORD | Flat | Leasehold | £237,795 |
| 12 Aug 2005 | KNIGHTSBRIDGE COURT, FLAT 14, OBSERVER DRIVE, WATFORD | Flat | Leasehold | £223,500 |
| 29 Jul 2005 | KNIGHTSBRIDGE COURT, FLAT 2, OBSERVER DRIVE, WATFORD | Flat | Leasehold | £230,000 |
| 29 Jul 2005 | KNIGHTSBRIDGE COURT, FLAT 9, OBSERVER DRIVE, WATFORD | Flat | Leasehold | £211,100 |
| 29 Jul 2005 | KNIGHTSBRIDGE COURT, FLAT 8, OBSERVER DRIVE, WATFORD | Flat | Leasehold | £232,000 |
| 29 Jul 2005 | KNIGHTSBRIDGE COURT, FLAT 3, OBSERVER DRIVE, WATFORD | Flat | Leasehold | £230,000 |
| 29 Jul 2005 | KNIGHTSBRIDGE COURT, FLAT 15, OBSERVER DRIVE, WATFORD | Flat | Leasehold | £235,000 |
| 26 Jul 2005 | KNIGHTSBRIDGE COURT, FLAT 4, OBSERVER DRIVE, WATFORD | Flat | Leasehold | £232,000 |
| 26 Jul 2005 | KNIGHTSBRIDGE COURT, FLAT 5, OBSERVER DRIVE, WATFORD | Flat | Leasehold | £235,000 |
| 26 Jul 2005 | KNIGHTSBRIDGE COURT, FLAT 6, OBSERVER DRIVE, WATFORD | Flat | Leasehold | £230,000 |
| 15 Jul 2005 | KNIGHTSBRIDGE COURT, FLAT 13, OBSERVER DRIVE, WATFORD | Flat | Leasehold | £230,000 |
| 14 Jul 2005 | KNIGHTSBRIDGE COURT, FLAT 17, OBSERVER DRIVE, WATFORD | Flat | Leasehold | £239,000 |
| 1 Jul 2005 | 7, OBSERVER DRIVE, WATFORD | Terraced | Freehold | £350,000 |
| 27 May 2005 | 1, OBSERVER DRIVE, WATFORD | Terraced | Freehold | £375,000 |
| 11 Apr 2005 | 6, OBSERVER DRIVE, WATFORD | Detached | Freehold | £242,495 |
| 24 Mar 2005 | 2, OBSERVER DRIVE, WATFORD | Terraced | Freehold | £244,995 |
| 17 Dec 2004 | 4, OBSERVER DRIVE, WATFORD | Terraced | Freehold | £315,000 |
| 26 Aug 2003 | 5, OBSERVER DRIVE, WATFORD | Detached | Freehold | £370,000 |