| 9 Onslow Square, London | - | 34 m² | - |
| 9A, Onslow Square, London | - | 72 m² | - |
| 13, Onslow Square, London | - | 100 m² | - |
| 21 Onslow Square, London | - | 116 m² | - |
| Flat 1, 1 Onslow Square, London | Leasehold | 111 m² | £2,300,000 (2021) |
| Flat 1, 11, Onslow Square, London | - | 100 m² | - |
| Flat 1, 17 Onslow Square, London | Leasehold | 116 m² | £3,600,000 (2022) |
| Flat 1A, 25 Onslow Square, London | Leasehold | 40 m² | £560,000 (2020) |
| Flat 2, 5 Onslow Square, London | - | 113 m² | - |
| Flat 2, 11 Onslow Square, London | Leasehold | 108 m² | £2,750,000 (2025) |
| Flat 2, 17 Onslow Square, London | Leasehold | 113 m² | £500,000 (1997) |
| Flat 2, 23 Onslow Square, London | Leasehold | 117 m² | £2,825,000 (2024) |
| Flat 3, 5 Onslow Square, London | Leasehold | 117 m² | £518,619 (2012) |
| Flat 3, 11 Onslow Square, London | Leasehold | 82 m² | £1,352,000 (2007) |
| Flat 3, 23 Onslow Square, London | Leasehold | 64 m² | £2,800,000 (2023) |
| Flat 4, 5, Onslow Square, London | Leasehold | 101 m² | £2,850,000 (2015) |
| Flat 4, 11 Onslow Square, London | - | 111 m² | - |
| Flat 4, 17 Onslow Square, London | Leasehold | 110 m² | £725,000 (2003) |
| Flat 4, 25, Onslow Square, London | - | 173 m² | - |
| Flat 5, 5 Onslow Square, London | Leasehold | 123 m² | £2,300,000 (2013) |
| Flat 5, 11 Onslow Square, London, London | Leasehold | 110 m² | £700,000 (2005) |
| Flat 5, 25, Onslow Square, London | Leasehold | 60 m² | £735,000 (2000) |
| Flat 6, 5 Onslow Square, London | Leasehold | 106 m² | £1,050,000 (2002) |
| Flat 6, 11 Onslow Square, London | - | 105 m² | - |
| Flat 6, 25, Onslow Square, London | - | 60 m² | - |
| Flat 7, 5 Onslow Square, London | - | 121 m² | - |
| Flat 7, 11 Onslow Square, London | - | 83 m² | - |
| Flat 8, 5 Onslow Square, London | Leasehold | 211 m² | £625,000 (1995) |
| Flat 8, 11, Onslow Square, London | Leasehold | 70 m² | £448,213 (2002) |
| Flat 8, 25 Onslow Square, London | Leasehold | 136 m² | £3,600,000 (2013) |
| Flat 9, 11 Onslow Square, London, London | - | 74 m² | - |
| Flat 10, 25, Onslow Square, London | Leasehold | 134 m² | £2,600,000 (2013) |
| Flat 11, 25 Onslow Square, London | Leasehold | 94 m² | £1,600,000 (2023) |
| Flat 12, 25 Onslow Square, London | Leasehold | 116 m² | £560,000 (2024) |
| Ground Floor Flat, 19 Onslow Square, London | Leasehold | 145 m² | £4,400,000 (2016) |
