| 1, Heol Williams, Old St. Mellons, Cardiff | Freehold | 113 m² | £300,000 (2019) |
| 2, Heol Williams, Old St. Mellons, Cardiff | Freehold | 99 m² | £252,995 (2020) |
| 3, Heol Williams, Old St. Mellons, Cardiff | Freehold | 90 m² | £289,995 (2019) |
| 4, Heol Williams, Old St. Mellons, Cardiff | Freehold | 99 m² | £315,000 (2024) |
| 5, Heol Williams, Old St. Mellons, Cardiff | Freehold | 90 m² | £279,995 (2018) |
| 6 Heol Williams, Old St. Mellons, Cardiff | Freehold | 71 m² | £272,000 (2023) |
| 7, Heol Williams, Old St. Mellons, Cardiff | Freehold | 51 m² | £169,995 (2018) |
| 8, Heol Williams, Old St. Mellons, Cardiff | Freehold | 71 m² | £280,000 (2025) |
| 9, Heol Williams, Old St. Mellons, Cardiff | Freehold | 51 m² | £185,000 (2021) |
| 10, Heol Williams, Old St. Mellons, Cardiff | Freehold | 71 m² | £219,995 (2019) |
| 11, Heol Williams, Old St. Mellons, Cardiff | Freehold | 51 m² | £195,000 (2021) |
| 12, Heol Williams, Old St. Mellons, Cardiff | Freehold | 71 m² | £217,995 (2019) |
| 13, Heol Williams, Old St. Mellons, Cardiff | Freehold | 51 m² | £217,000 (2025) |
| 14, Heol Williams, Old St. Mellons, Cardiff | Freehold | 99 m² | £275,000 (2023) |
| 15, Heol Williams, Old St. Mellons, Cardiff | Freehold | 51 m² | £202,500 (2023) |
| 16, Heol Williams, Old St. Mellons, Cardiff | Freehold | 99 m² | £315,000 (2024) |
| 17, Heol Williams, Old St. Mellons, Cardiff | Freehold | 51 m² | £215,000 (2023) |
| 18, Heol Williams, Old St. Mellons, Cardiff | Freehold | 99 m² | £250,000 (2019) |
| 19, Heol Williams, Old St. Mellons, Cardiff | Freehold | 71 m² | £212,000 (2018) |
| 20, Heol Williams, Old St. Mellons, Cardiff | Freehold | 99 m² | £250,000 (2020) |
| 21, Heol Williams, Old St. Mellons, Cardiff | Freehold | 71 m² | £255,000 (2025) |
| 22, Heol Williams, Old St. Mellons, Cardiff | Freehold | 71 m² | £269,000 (2024) |
| 23, Heol Williams, Old St. Mellons, Cardiff | Freehold | 94 m² | £280,000 (2026) |
| 24, Heol Williams, Old St. Mellons, Cardiff | Freehold | 71 m² | £224,995 (2019) |
| 25, Heol Williams, Old St. Mellons, Cardiff | Freehold | 94 m² | £204,000 (2019) |
| 26, Heol Williams, Old St. Mellons, Cardiff | Freehold | 71 m² | £283,000 (2024) |
| 27, Heol Williams, Old St. Mellons, Cardiff | Freehold | 94 m² | £207,000 (2020) |
| 28, Heol Williams, Old St. Mellons, Cardiff | Freehold | 71 m² | £217,995 (2019) |
| 29, Heol Williams, Old St. Mellons, Cardiff | Freehold | 51 m² | £230,000 (2023) |
| 30, Heol Williams, Old St. Mellons, Cardiff | Freehold | 99 m² | £311,000 (2024) |
| 31, Heol Williams, Old St. Mellons, Cardiff | Freehold | 51 m² | £237,500 (2025) |
| 32, Heol Williams, Old St. Mellons, Cardiff | Freehold | 99 m² | £314,950 (2024) |
| 33, Heol Williams, Old St. Mellons, Cardiff | - | 58 m² | - |
| 34, Heol Williams, Old St. Mellons, Cardiff | Freehold | 113 m² | £300,000 (2019) |
| 35, Heol Williams, Old St. Mellons, Cardiff | - | 58 m² | - |
| 36, Heol Williams, Old St. Mellons, Cardiff | Freehold | 113 m² | £300,000 (2020) |
| 37, Heol Williams, Old St. Mellons, Cardiff | Freehold | 51 m² | £210,000 (2025) |
| 38, Heol Williams, Old St. Mellons, Cardiff | Freehold | 93 m² | £274,995 (2020) |
| 39, Heol Williams, Old St. Mellons, Cardiff | Freehold | 51 m² | £155,000 (2018) |
| 40, Heol Williams, Old St. Mellons, Cardiff | Freehold | 71 m² | £285,000 (2025) |
| 41, Heol Williams, Old St. Mellons, Cardiff | Freehold | 94 m² | £155,000 (2018) |
| 42, Heol Williams, Old St. Mellons, Cardiff | Freehold | 71 m² | £219,995 (2019) |
| 43, Heol Williams, Old St. Mellons, Cardiff | Freehold | 94 m² | £162,495 (2018) |
| 44, Heol Williams, Old St. Mellons, Cardiff | Freehold | 71 m² | £219,995 (2019) |
| 45, Heol Williams, Old St. Mellons, Cardiff | Freehold | 93 m² | £284,995 (2018) |
| 46, Heol Williams, Old St. Mellons, Cardiff | Freehold | 71 m² | £224,995 (2018) |
| 48, Heol Williams, Old St. Mellons, Cardiff | Freehold | 69 m² | £194,995 (2018) |
| 50, Heol Williams, Old St. Mellons, Cardiff | Freehold | 69 m² | £190,000 (2018) |
| 52, Heol Williams, Old St. Mellons, Cardiff | Freehold | 69 m² | £250,000 (2026) |
| 54, Heol Williams, Old St. Mellons, Cardiff | Freehold | 94 m² | £240,000 (2021) |
| 56, Heol Williams, Old St. Mellons, Cardiff | Freehold | 94 m² | £204,995 (2020) |
| 58, Heol Williams, Old St. Mellons, Cardiff | Freehold | 90 m² | £269,995 (2020) |
| 60, Heol Williams, Old St. Mellons, Cardiff | Freehold | 93 m² | £270,000 (2020) |
| 62, Heol Williams, Old St. Mellons, Cardiff | Freehold | 93 m² | £274,995 (2019) |
| 64, Heol Williams, Old St. Mellons, Cardiff | Freehold | 90 m² | £409,950 (2026) |
| 66, Heol Williams, Old St. Mellons, Cardiff | Freehold | 102 m² | £299,995 (2018) |
| 68, Heol Williams, Old St. Mellons, Cardiff | Freehold | 102 m² | £405,000 (2025) |
| 70, Heol Williams, Old St. Mellons, Cardiff | Freehold | 113 m² | £300,000 (2019) |