| Flat 1, 27, Onslow Square, London | Leasehold | 95 m² | £1,625,000 (2014) |
| Flat 2, 27, Onslow Square, London | Leasehold | 67 m² | £1,050,000 (2023) |
| Flat 3, 27, Onslow Square, London | Leasehold | 74 m² | £400,000 (2009) |
| Flat 4, 27, Onslow Square, London | - | 90 m² | - |
| Flat 5, 27, Onslow Square, London | - | 96 m² | - |
| Flat 6, 27 Onslow Square, London | Leasehold | 101 m² | £430,000 (2021) |
| Flat 7, 27, Onslow Square, London | Leasehold | 73 m² | £1,400,000 (2015) |
| Flat 8, 27 Onslow Square, London | Leasehold | 91 m² | £1,375,000 (2013) |
| Flat 9, 27 Onslow Square, London | Leasehold | 93 m² | £2,275,000 (2014) |
| Flat 10, 27, Onslow Square, London | Leasehold | 95 m² | £1,700,000 (2017) |
| Flat 11, 27, Onslow Square, London | Leasehold | 71 m² | £1,130,000 (2022) |
| Flat 12, 27, Onslow Square, London | Leasehold | 90 m² | £1,400,000 (2024) |
| Flat 14, 27 Onslow Square, London | Leasehold | 93 m² | £1,493,500 (2024) |
| Flat 15, 27, Onslow Square, London | - | 96 m² | - |
| Flat 16, 27, Onslow Square, London | Leasehold | 73 m² | £275,000 (2024) |
| Flat 17, 27, Onslow Square, London | Leasehold | 89 m² | £1,751,000 (2012) |
| Flat 18, 27 Onslow Square, London | Leasehold | 99 m² | £1,700,000 (2013) |
| Flat 19, 27 Onslow Square, London | Leasehold | 83 m² | £930,000 (2007) |
| Flat 20, 27 Onslow Square, London | Leasehold | 78 m² | £420,000 (2002) |
| Flat 21, 27 Onslow Square, London | Leasehold | 92 m² | £550,000 (2003) |
| Flat 22, 27, Onslow Square, London | - | 96 m² | - |
| Flat 24, 27 Onslow Square, London | Leasehold | 163 m² | £1,200,000 (2005) |
