Genealogy research by Mark Humphrys,
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Simmonscourt Castle is off what is now Simmonscourt Rd, Ballsbridge, Co.Dublin.
The ruin today is
close to the Victorian "Simmonscourt Castle".
The entrance is near the Anglesea Rd end of Simmonscourt Rd (at the far end from the RDS) and is marked "Simmonscourt Castle" on the gate.
The medieval block is down the avenue on the RHS. Beyond it are a modern block of flats, and the Victorian building.
Detail of John Rocque's map of Dublin, 1757, showing Baggotrath, Simmonscourt and Donnybrook.
The Donnybrook/Stillorgan/Wicklow road still exists, and the Ballsbridge/Merrion road still exists, but everything in between has been obliterated.
Detail of 1757 map above.
Simmonscourt Castle was already a ruin by this time. There seems to be a complex of buildings at the site.
Simmonscourt in [Taylor and Skinner, 1777].
Simmonscourt Castle on 1829 to 1842 map.
There is a new "Simmonscourt Castle". The medieval castle is marked "Castle".
Simmonscourt Castle on 1887 to 1913 map.
Location of Simmonscourt Castle today.
Click to toggle map/satellite view. Click to zoom in/out. Drag to move.
From Google Maps.
Close-up of the above.
The green-covered block at the start of the avenue is the old Simmonscourt Castle.
To the SE of it are a modern block of flats, and the Victorian "Simmonscourt Castle".
Simmonscourt Castle on Google 45 degree view.
Up is S.
This looks pretty much like the front of the ruin looks today.
However Gabriel Beranger's views in the 1760s look entirely different.
[Harbison, 1998] suggests the present ruin might represent only the gate house for the now-vanished main block seen in Beranger's views.
Simmonscourt Castle was also described by Austin Cooper 1780, and that description is also like this gate house.
So that would mean the main block vanished some time around 1770.
Photo 1999. See full size.
See the Victorian building in background LHS.
Photo 1999. Note modern block of flats in background LHS.
Light adjusted digitally. See original.