| 7 Hartlea Avenue, Darlington, DL1 3NE | Oct 2025 | £245,000 | Semi-detached | Freehold |
| Thirdown Hartlea Avenue, Darlington, DL1 3NE | Sep 2022 | £275,000 | Detached | Freehold |
| 1A Hartlea Avenue, Darlington, DL1 3NE | Jun 2022 | £190,000 | Detached | Freehold |
| 12 Hartlea Avenue, Darlington, DL1 3NE | Dec 2021 | £240,000 | Semi-detached | Freehold |
| 5 Hartlea Avenue, Darlington, DL1 3NE | Nov 2021 | £299,950 | Detached | Freehold |
| 21 Hartlea Avenue, Darlington, DL1 3NE | Sep 2020 | £122,500 | Terraced | Freehold |
| Lynter Hartlea Avenue, Darlington, DL1 3NE | May 2020 | £150,000 | Detached | Freehold |
| 18 Hartlea Avenue, Darlington, DL1 3NE | Aug 2019 | £220,000 | Semi-detached | Freehold |
| Corbiere Hartlea Avenue, Darlington, DL1 3NE | Mar 2019 | £210,000 | Detached | Freehold |
| 19 Hartlea Avenue, Darlington, DL1 3NE | Dec 2018 | £158,500 | Semi-detached | Freehold |
| 11 Hartlea Avenue, Darlington, DL1 3NE | Aug 2017 | £168,000 | Semi-detached | Freehold |
| 6 Hartlea Avenue, Darlington, DL1 3NE | Mar 2017 | £205,000 | Detached | Freehold |
| 3 Hartlea Avenue, Darlington, DL1 3NE | Feb 2016 | £170,000 | Semi-detached | Freehold |
| 8 Hartlea Avenue, Darlington, DL1 3NE | Sep 2013 | £176,000 | Semi-detached | Freehold |
| 15 Hartlea Avenue, Darlington, DL1 3NE | Jan 2013 | £152,500 | Semi-detached | Freehold |
| Jareck Hartlea Avenue, Darlington, DL1 3NE | Nov 2012 | £206,000 | Detached | Freehold |
| 20 Hartlea Avenue, Darlington, DL1 3NE | Dec 2007 | £157,000 | Semi-detached | Freehold |
| 2 Hartlea Avenue, Darlington, DL1 3NE | Jan 2004 | £172,000 | Detached | Freehold |
| Osy Hartlea Avenue, Darlington, DL1 3NE | Nov 2003 | £190,000 | Detached | Freehold |
| 23 Hartlea Avenue, Darlington, DL1 3NE | Mar 2003 | £94,000 | Semi-detached | Freehold |
| Leeholm Hartlea Avenue, Darlington, DL1 3NE | Jul 2001 | £130,000 | Detached | Freehold |