| 1 Helvellyn Avenue, Washington | - | 82 m² | - |
| 3, Helvellyn Avenue, Washington | Leasehold | 78 m² | £49,050 (1998) |
| 5, Helvellyn Avenue, Washington | - | 76 m² | - |
| 9, Helvellyn Avenue, Washington | - | 120 m² | - |
| 11, Helvellyn Avenue, Washington | - | 73 m² | - |
| 23 Helvellyn Avenue, Washington | Freehold | 51 m² | £160,000 (2025) |
| 31 Helvellyn Avenue, Washington | Freehold | 52 m² | £126,000 (2023) |
| 33, Helvellyn Avenue, Washington | - | 63 m² | - |
| 35 Helvellyn Avenue, Washington | Freehold | 78 m² | £12,985 (1997) |
| 41, Helvellyn Avenue, Washington | Freehold | 65 m² | £100,000 (2017) |
| 45, Helvellyn Avenue, Washington | Freehold | 79 m² | £115,000 (2013) |
| 47, Helvellyn Avenue, Washington | Freehold | 46 m² | £98,000 (2017) |
| 51 Helvellyn Avenue, Lambton, Washington, Washington | - | 135 m² | - |
| 53, Helvellyn Avenue, Washington | Freehold | 79 m² | £165,000 (2019) |
| 59, Helvellyn Avenue, Washington | Freehold | 96 m² | £72,950 (2002) |
| 61, Helvellyn Avenue, Washington | Freehold | 73 m² | £172,000 (2018) |
| 63, Helvellyn Avenue, Washington | Freehold | 79 m² | £166,000 (2015) |
| 71, Helvellyn Avenue, Washington | Freehold | 64 m² | £106,000 (2016) |
| 73, Helvellyn Avenue, Washington | Freehold | 56 m² | £95,000 (2019) |
| 79, Helvellyn Avenue, Washington | Freehold | 52 m² | £103,000 (2015) |
| 83, Helvellyn Avenue, Washington | Freehold | 77 m² | £116,950 (2015) |
| 85, Helvellyn Avenue, Washington | Freehold | 64 m² | £116,000 (2011) |
| 89, Helvellyn Avenue, Washington | Freehold | 47 m² | £99,000 (2004) |
| 91, Helvellyn Avenue, Washington | Freehold | 46 m² | £35,000 (1997) |
| 93 Helvellyn Avenue, Lambton, Washington, Washington | Freehold | 63 m² | £155,000 (2024) |
| 95, Helvellyn Avenue, Washington | Freehold | 63 m² | £134,000 (2019) |
| 97, Helvellyn Avenue, Washington | Freehold | 55 m² | £121,000 (2018) |
| 99 Helvellyn Avenue, Washington | Freehold | 62 m² | £52,500 (2001) |
| 103 Helvellyn Avenue, Washington | Freehold | 47 m² | £125,000 (2026) |
| 105, Helvellyn Avenue, Washington | Freehold | 48 m² | £85,000 (2021) |
| 107 Helvellyn Avenue, Washington | Freehold | 75 m² | £185,000 (2008) |
| 109 Helvellyn Avenue, Washington | Freehold | 71 m² | £236,000 (2024) |
| 111, Helvellyn Avenue, Washington | Freehold | 53 m² | £100,000 (2017) |
| 113 Helvellyn Avenue, Washington | Freehold | 55 m² | £80,000 (2003) |
| 115, Helvellyn Avenue, Washington | Freehold | 63 m² | £124,950 (2018) |