The house was built for William Conolly, who rose from the son of a publican to become the wealthiest man in Ireland.
The Long Gallery, stretching 80 feet, is decorated with Pompeian-style frescoes inspired by the Grand Tour.
The house features a unique 'print room,' one of the few surviving examples in Ireland where original 18th-century prints are pasted directly onto the wallpaper.
Lady Louisa Conolly, who lived at the house, was a noted patron of the arts and helped design the surrounding landscape.
The staircase is constructed from solid Portland stone and features original wrought-iron balustrades.
The rear facade was designed by Sir Edward Lovett Pearce, who also designed the original Irish Parliament House in Dublin.
The estate grounds contain the 'Conolly Folly,' a massive 140-foot-high obelisk structure built to provide employment during the famine of 1740.
The 'Wonderful Barn,' a corkscrew-shaped granary, is located on the wider estate grounds, reflecting the experimental architecture of the era.
Castletown House is Ireland's first and largest example of Palladian architecture, designed by Alessandro Galilei and Sir Edward Lovett Pearce starting in 1722. Commissioned by William Conolly, then the Speaker of the Irish House of Commons, the mansion reflects the ambitions of the 18th-century Anglo-Irish landed gentry. The structure features a central block connected to two flanking wings by curved colonnades, a hallmark of the Palladian style. It is currently managed by the Office of Public Works (OPW) following a transfer of ownership from the Castletown Foundation. The interior showcases period furniture, fine art collections, and ornate plasterwork. Extensive parklands surround the house, featuring a mix of managed gardens and woodland walks along the River Liffey. The estate underwent significant interior renovations and structural conservation efforts in recent years to preserve its original 18th-century aesthetic. Visitors can explore both the state rooms within the house and the historical pleasure grounds.
The view of the main facade from the end of the long axial driveway.
Wear comfortable, waterproof footwear for exploring the gravel paths and meadow trails in the parkland.
Check the official OPW website before visiting to see if specific rooms are closed for ongoing conservation work.
Allow extra time to walk the perimeter of the estate to see the architectural follies scattered in the fields.
Do not attempt to access areas marked for private conservation or fenced-off restoration sites within the grounds.
The house interior is typically closed during the winter months, while the parklands remain open year-round.
Photography is generally permitted in the house without flash; follow staff instructions regarding restricted areas.
