Killyleagh Castle,
structure history 
| 1666 | renovated | |
| 1834 | added to | |
| » Duff, Thomas | » Jackson, Thomas | |
| 1849 | renovated | |
| » Lanyon, Charles | ||
| 1860 | added to | |
| » Ferrey, Benjamin | ||
| 1952 | renovated | |
| 2018 | renovated | |
| » Alastair Coey Architects | ||
| c 1610s | original construction | |