| Apartment 13, Northumberland House Lower Square, Isleworth, TW7 6RL | May 2023 | £295,000 | Flat / maisonette | Leasehold |
| Apartment 1, Northumberland House Lower Square, Isleworth, TW7 6RL | Feb 2023 | £315,000 | Flat / maisonette | Leasehold |
| Flat 2, The Old Blue School Apartments Lower Square, Isleworth, TW7 6RL | Nov 2022 | £615,000 | Flat / maisonette | Leasehold |
| Flat 5, The Old Blue School Apartments Lower Square, Isleworth, TW7 6RL | Oct 2022 | £570,000 | Flat / maisonette | Leasehold |
| Apartment 14, Northumberland House Lower Square, Isleworth, TW7 6RL | Mar 2019 | £272,000 | Flat / maisonette | Leasehold |
| Flat 1, The Old Blue School Apartments Lower Square, Isleworth, TW7 6RL | Feb 2019 | £590,000 | Flat / maisonette | Leasehold |
| Flat 4, The Old Blue School Apartments Lower Square, Isleworth, TW7 6RL | Nov 2018 | £535,000 | Flat / maisonette | Leasehold |
| Flat 3, The Old Blue School Apartments Lower Square, Isleworth, TW7 6RL | Dec 2015 | £2,460,000 | Other property | Freehold |
| Apartment 12, Northumberland House Lower Square, Isleworth, TW7 6RL | Jan 2008 | £240,000 | Flat / maisonette | Leasehold |
| Apartment 4, Northumberland House Lower Square, Isleworth, TW7 6RL | Oct 2007 | £250,000 | Flat / maisonette | Leasehold |
| Apartment 3, Northumberland House Lower Square, Isleworth, TW7 6RL | Oct 2007 | £272,500 | Flat / maisonette | Leasehold |
| Apartment 2, Northumberland House Lower Square, Isleworth, TW7 6RL | Oct 2007 | £277,500 | Flat / maisonette | Leasehold |
| Apartment 6, Northumberland House Lower Square, Isleworth, TW7 6RL | Oct 2007 | £315,000 | Flat / maisonette | Leasehold |
| Apartment 10, Northumberland House Lower Square, Isleworth, TW7 6RL | Oct 2007 | £335,000 | Flat / maisonette | Leasehold |
| Apartment 9, Northumberland House Lower Square, Isleworth, TW7 6RL | Oct 2007 | £360,000 | Flat / maisonette | Leasehold |
| Apartment 5, Northumberland House Lower Square, Isleworth, TW7 6RL | Oct 2007 | £385,500 | Flat / maisonette | Leasehold |
| Apartment 11, Northumberland House Lower Square, Isleworth, TW7 6RL | Oct 2007 | £250,000 | Flat / maisonette | Leasehold |
| Apartment 7, Northumberland House Lower Square, Isleworth, TW7 6RL | Oct 2007 | £305,000 | Flat / maisonette | Leasehold |
| Apartment 8, Northumberland House Lower Square, Isleworth, TW7 6RL | Sep 2007 | £270,000 | Flat / maisonette | Leasehold |