| 39 Gladstone Road, Watford | - | 36 m² | - |
| 39 Gladstone Road, Watford | Leasehold | 41 m² | £123,750 (2005) |
| 39A Gladstone Road, Watford, Watford | Leasehold | 57 m² | £227,000 (2021) |
| 39B, Gladstone Road, Watford | Leasehold | 43 m² | £225,000 (2017) |
| 41 Gladstone Road, Watford | Leasehold | 36 m² | £165,000 (2014) |
| 41A Gladstone Road, Watford, Watford | Leasehold | 45 m² | £218,000 (2021) |
| 41B, Gladstone Road, Watford | Leasehold | 39 m² | £113,000 (2003) |
| 43 Gladstone Road, Watford | Freehold | 162 m² | £425,000 (2017) |
| 45A Gladstone Road, Watford | Leasehold | 60 m² | £300,000 (2022) |
| 45B Gladstone Road, Watford | - | 43 m² | - |
| 45C Gladstone Road, Watford | - | 76 m² | - |
| 49, Gladstone Road, Watford | Freehold | 116 m² | £135,000 (1998) |
| 53 Gladstone Road, Watford | Freehold | 156 m² | £485,000 (2023) |
| 55, Gladstone Road, Watford | Freehold | 167 m² | £590,000 (2024) |
| 57A Gladstone Road, Watford | Leasehold | 36 m² | £130,000 (2010) |
| 57B Gladstone Road, Watford | - | 32 m² | - |
| 57C, Gladstone Road, Watford | Leasehold | 38 m² | £203,000 (2018) |
| 59 Gladstone Road, Watford, Watford | Freehold | 162 m² | £390,000 (2019) |
| 63B Gladstone Road, Watford | Leasehold | 31 m² | £150,000 (2015) |
| 65 Gladstone Road, Watford | Freehold | 114 m² | £450,000 (2017) |
| 67, Gladstone Road, Watford | Freehold | 124 m² | £155,000 (2010) |
| 69 Gladstone Road, Watford | Freehold | 146 m² | £530,000 (2022) |
| 71, Gladstone Road, Watford | Freehold | 127 m² | £285,000 (2013) |
| 75A, Gladstone Road, Watford | - | 84 m² | - |
| 75B Gladstone Road, Watford | Leasehold | 68 m² | £150,000 (2011) |
| 77 Gladstone Road, Watford, Watford | Leasehold | 35 m² | £171,000 (2025) |
| 77A, Gladstone Road, Watford | Leasehold | 35 m² | £59,000 (2001) |
| 77B Gladstone Road, Watford | Leasehold | 39 m² | £105,500 (2012) |
| 79 Gladstone Road, Watford | Freehold | 139 m² | £127,000 (2001) |
| 85, Gladstone Road, Watford | - | 191 m² | - |
| 87 Gladstone Road, Watford | Leasehold | 97 m² | £403,000 (2024) |
| 87A, Gladstone Road, Watford | Leasehold | 36 m² | £213,000 (2018) |
| 89A Gladstone Road, Watford | Leasehold | 93 m² | £173,500 (2006) |
| 91, Gladstone Road, Watford | Leasehold | 36 m² | £211,000 (2024) |
| 91A, Gladstone Road, Watford | Leasehold | 43 m² | £137,000 (2013) |
| 93A Gladstone Road, Watford | - | 29 m² | - |
| 93B Gladstone Road, Watford | Leasehold | 34 m² | £225,000 (2025) |
| 93C Gladstone Road, Watford | Leasehold | 44 m² | £228,000 (2025) |
| 95 Gladstone Road, Watford | - | 70 m² | - |
| 97B, Gladstone Road, Watford | - | 51 m² | - |
| 99 Gladstone Road, Watford | - | 131 m² | - |
| 101B Gladstone Road, Watford | Leasehold | 49 m² | £39,950 (1998) |
| 101C Gladstone Road, Watford | - | 59 m² | - |
| 103, Gladstone Road, Watford | - | 78 m² | - |
| 105, Gladstone Road, Watford | - | 44 m² | - |
| 107A Gladstone Road, Watford | Leasehold | 50 m² | £68,000 (2000) |
| 107B Gladstone Road, Watford | Leasehold | 41 m² | £115,000 (2011) |
| 107C, Gladstone Road, Watford | Leasehold | 50 m² | £240,000 (2018) |
| 109B Gladstone Road, Watford | Leasehold | 45 m² | £225,000 (2025) |
| 109C Gladstone Road, Watford | Leasehold | 46 m² | £245,000 (2023) |
| 111A, Gladstone Road, Watford | Leasehold | 51 m² | £77,000 (2001) |
| 111B-111C, Gladstone Road, Watford | Leasehold | 44 m² | £160,000 (2014) |
| 111C Gladstone Road, Watford | - | 54 m² | - |
| 115, Gladstone Road, Watford | Freehold | 90 m² | £322,000 (2019) |
| 117 Gladstone Road, Watford | Freehold | 90 m² | £425,000 (2024) |
| 121 Gladstone Road, Watford | Freehold | 92 m² | £270,000 (2022) |
| 127, Gladstone Road, Watford | - | 94 m² | - |
| 129, Gladstone Road, Watford | Freehold | 86 m² | £228,000 (2007) |
| 131 Gladstone Road, Watford | Freehold | 122 m² | £475,000 (2022) |
| 133A Gladstone Road, Watford | Leasehold | 52 m² | £261,999 (2023) |
| 135, Gladstone Road, Watford | Freehold | 159 m² | £484,950 (2016) |
| 139, Gladstone Road, Watford | Freehold | 88 m² | £325,000 (2020) |
| 141 Gladstone Road, Watford | Freehold | 138 m² | £360,000 (2007) |
| 143 Gladstone Road, Watford | Leasehold | 64 m² | £325,000 (2025) |
| First Floor Flat, 139 Gladstone Road, Watford, Watford | - | 49 m² | - |
| Flat 1, 51, Gladstone Road, Watford | Leasehold | 43 m² | £124,000 (2011) |
| Flat 1, 67 Gladstone Road, Watford, Watford | - | 95 m² | - |
| Flat 1, 137, Gladstone Road, Watford | Leasehold | 51 m² | £258,000 (2024) |
| Flat 2, 51, Gladstone Road, Watford | Leasehold | 37 m² | £116,000 (2011) |
| Flat 2, 67 Gladstone Road, Watford, Watford | - | 77 m² | - |
| Flat 2, 137 Gladstone Road, Watford | Leasehold | 41 m² | £260,000 (2021) |
| Flat 3, 51, Gladstone Road, Watford | Leasehold | 36 m² | £123,000 (2012) |
| Flat, 63C Gladstone Road, Watford | Leasehold | 51 m² | £187,050 (2015) |
| Flat, 101A Gladstone Road, Watford, Watford | - | 34 m² | - |
| The Garden Flat, 105 Gladstone Road, Watford | Leasehold | 51 m² | £207,500 (2018) |
