| 1 St. Marys Court, Ottway Walk, Welwyn | Leasehold | 48 m² | £310,000 (2025) |
| 2, St. Marys Court, Ottway Walk, Welwyn | Leasehold | 50 m² | £200,000 (2017) |
| 3, St. Marys Court, Ottway Walk, Welwyn | Leasehold | 48 m² | £175,000 (2016) |
| 4, St. Marys Court, Ottway Walk, Welwyn | Leasehold | 51 m² | £200,000 (2019) |
| 5 St. Marys Court, Ottway Walk, Welwyn | - | 74 m² | - |
| 6 St. Marys Court, Ottway Walk, Welwyn | Freehold | 52 m² | £195,000 (2022) |
| 7, St. Marys Court, Ottway Walk, Welwyn | Freehold | 28 m² | £200,000 (2017) |
| 10, St. Marys Court, Ottway Walk, Welwyn | Freehold | 108 m² | £285,000 (2012) |
| 11 St. Marys Court, Ottway Walk, Welwyn | Freehold | 70 m² | £295,000 (2024) |
| 12 St. Marys Court, Ottway Walk, Welwyn | Freehold | 51 m² | £207,500 (2019) |
| 13, St. Marys Court, Ottway Walk, Welwyn | Freehold | 52 m² | £152,500 (2014) |
| 14 St Marys Court, Welwyn, Welwyn | Freehold | 74 m² | £335,000 (2021) |
| 15, St. Marys Court, Ottway Walk, Welwyn | Leasehold | 55 m² | £282,000 (2020) |
| 16, St. Marys Court, Ottway Walk, Welwyn | Freehold | 93 m² | £375,000 (2019) |
| 17 St. Marys Court, Ottway Walk, Welwyn | Leasehold | 59 m² | £202,500 (2021) |
| 18, St. Marys Court, Ottway Walk, Welwyn | Freehold | 104 m² | £292,500 (2011) |
| 20, St. Marys Court, Ottway Walk, Welwyn | Freehold | 87 m² | £410,000 (2022) |
| 21 St. Marys Court, Ottway Walk, Welwyn | Freehold | 86 m² | £365,000 (2024) |
| 22 St. Marys Court, Ottway Walk, Welwyn | Freehold | 89 m² | £340,000 (2018) |
| 23 St. Marys Court, Ottway Walk, Welwyn | Freehold | 81 m² | £368,000 (2024) |
| 24, St. Marys Court, Ottway Walk, Welwyn | Freehold | 100 m² | £290,000 (2011) |
| 25, St. Marys Court, Ottway Walk, Welwyn | Freehold | 85 m² | £413,000 (2021) |
| 27, St. Marys Court, Ottway Walk, Welwyn | Freehold | 86 m² | £350,000 (2018) |
| 28, St. Marys Court, Ottway Walk, Welwyn | Freehold | 84 m² | £370,000 (2018) |
| 29 St. Marys Court, Ottway Walk, Welwyn | - | 87 m² | - |
| 31, St. Marys Court, Ottway Walk, Welwyn | Freehold | 87 m² | £250,000 (2012) |
| 32, St. Marys Court, Ottway Walk, Welwyn | Freehold | 86 m² | £280,000 (2012) |
| 33, St. Marys Court, Ottway Walk, Welwyn | Freehold | 100 m² | £265,000 (2011) |
| 35, St. Marys Court, Ottway Walk, Welwyn | Leasehold | 59 m² | £195,000 (2017) |
| 36, St. Marys Court, Ottway Walk, Welwyn | Leasehold | 47 m² | £175,000 (2018) |
| 37, St. Marys Court, Ottway Walk, Welwyn | Leasehold | 58 m² | £250,000 (2019) |
| 38, St. Marys Court, Ottway Walk, Welwyn | Leasehold | 60 m² | £220,000 (2018) |