| 1, Principal Court, Letchworth Garden City | Leasehold | 67 m² | £185,000 (2013) |
| 2 Principal Court, Letchworth Garden City | Leasehold | 65 m² | £245,000 (2025) |
| 3, Principal Court, Letchworth Garden City | Leasehold | 61 m² | £245,000 (2025) |
| 4 Principal Court, Letchworth Garden City | Leasehold | 64 m² | £263,400 (2023) |
| 5 Principal Court, Letchworth Garden City | - | 81 m² | - |
| 10, Principal Court, Letchworth Garden City | - | 70 m² | - |
| 11 Principal Court, Letchworth Garden City, Letchworth Garden City | - | 75 m² | - |
| 12, Principal Court, Letchworth Garden City | - | 69 m² | - |
| 14 Principal Court, Letchworth Garden City | - | 49 m² | - |
| 15, Principal Court, Letchworth Garden City | - | 49 m² | - |
| 17, Principal Court, Letchworth Garden City | - | 49 m² | - |
| 19, Principal Court, Letchworth Garden City | Leasehold | 62 m² | £290,000 (2021) |
| 20 Principal Court, Letchworth Garden City, Letchworth Garden City | Leasehold | 35 m² | £170,000 (2024) |
| 21 Principal Court, Letchworth Garden City, Letchworth Garden City | Leasehold | 33 m² | £190,000 (2023) |
| 22, Principal Court, Letchworth Garden City | Leasehold | 70 m² | £180,000 (2008) |
| 23, Principal Court, Letchworth Garden City | Leasehold | 55 m² | £203,500 (2020) |
| 24, Principal Court, Letchworth Garden City | Leasehold | 60 m² | £187,500 (2012) |
| 25 Principal Court, Letchworth Garden City | Freehold | 82 m² | £250,000 (2014) |
| 26 Principal Court, Letchworth Garden City | Freehold | 73 m² | £295,000 (2025) |
| 27, Principal Court, Letchworth Garden City | Freehold | 39 m² | £199,950 (2009) |
| 28, Principal Court, Letchworth Garden City | Freehold | 56 m² | £225,000 (2009) |
| 29, Principal Court, Letchworth Garden City | Freehold | 39 m² | £199,950 (2010) |
| 30 Principal Court, Letchworth Garden City, Letchworth Garden City | Leasehold | 62 m² | £270,000 (2022) |
| 31, Principal Court, Letchworth Garden City | Leasehold | 60 m² | £228,000 (2021) |
| 32, Principal Court, Letchworth Garden City | Freehold | 77 m² | £247,500 (2014) |
| 33, Principal Court, Letchworth Garden City | Freehold | 78 m² | £182,950 (2010) |
| 34, Principal Court, Letchworth Garden City | Freehold | 33 m² | £171,000 (2010) |
| 35 Principal Court, Letchworth Garden City | Freehold | 10 m² | £277,500 (2016) |
| 36 Principal Court, Letchworth Garden City, Letchworth Garden City | Freehold | 77 m² | £300,000 (2021) |
| 37, Principal Court, Letchworth Garden City | Leasehold | 59 m² | £245,000 (2019) |
| 38 Principal Court, Letchworth Garden City | Leasehold | 65 m² | £202,000 (2015) |
| 39 Principal Court, Letchworth Garden City | Freehold | 83 m² | £190,000 (2009) |
| 40, Principal Court, Letchworth Garden City | Freehold | 39 m² | £194,000 (2009) |
| 41, Principal Court, Letchworth Garden City | Freehold | 56 m² | £380,000 (2018) |
| 42, Principal Court, Letchworth Garden City | Freehold | 78 m² | £315,000 (2025) |
| 43, Principal Court, Letchworth Garden City | Freehold | 38 m² | £192,930 (2009) |
| 44, Principal Court, Letchworth Garden City | Freehold | 72 m² | £247,500 (2015) |
| 45, Principal Court, Letchworth Garden City | Leasehold | 59 m² | £159,950 (2009) |
| 46 Principal Court, Letchworth Garden City, Letchworth Garden City | Leasehold | 61 m² | £260,000 (2021) |
| 47, Principal Court, Letchworth Garden City | Freehold | 34 m² | £230,000 (2015) |
| 48, Principal Court, Letchworth Garden City | Freehold | 180 m² | £427,341 (2009) |
| 49, Principal Court, Letchworth Garden City | Freehold | 155 m² | £466,000 (2009) |
| 50, Principal Court, Letchworth Garden City | Freehold | 155 m² | £562,500 (2014) |
| 51 Principal Court, Letchworth Garden City | Freehold | 157 m² | £670,000 (2024) |
| 52 Principal Court, Letchworth Garden City | Leasehold | 67 m² | £248,130 (2016) |
| 53 Principal Court, Letchworth Garden City, Letchworth Garden City | Leasehold | 53 m² | £280,000 (2021) |
| 54, Principal Court, Letchworth Garden City | Leasehold | 66 m² | £265,000 (2018) |
| 55, Principal Court, Letchworth Garden City | Leasehold | 62 m² | £275,000 (2023) |
| 56, Principal Court, Letchworth Garden City | Leasehold | 66 m² | £280,000 (2026) |
| 57, Principal Court, Letchworth Garden City | Leasehold | 59 m² | £180,000 (2007) |