Overview
Castletown is Ireland’s earliest and largest Palladian house, built in the 1720s for William Conolly, a Kildare innkeeper’s son who rose to be the richest man in Ireland and Speaker of the Irish House of Commons. It is now run by the Office of Public Works, and the split is worth knowing before you go: the parklands along the River Liffey are free and open daily, and drew nearly 700,000 visitors in 2023, while the house itself is seen only on a guided tour, which is ticketed (€10 for an adult). If your time is short, the house tour is the thing to book – the parkland you can enjoy any evening; the interiors you cannot.
A Georgian Masterpiece
The estate’s origins trace back to 1722, when Conolly commissioned a residence that would project his political influence and commercial success. The elegant façade is attributed to Italian architect Alessandro Galilei, while Irish architect Sir Edward Lovett Pearce managed construction and designed the sweeping wings. Conolly died in 1729, but his widow Katherine shaped the early landscape, commissioning structures like the Wonderful Barn and Conolly Folly partly to provide local employment during economic hardship.
By the mid-18th century, the house passed to Conolly’s great-nephew Thomas and his wife Lady Louisa. Their era left the most visible mark on the interiors: the dramatic cantilevered staircase, intricate stucco work by the Lafranchini brothers, and the 80-foot Long Gallery. Lady Louisa also redesigned the grounds, introducing graceful river walks and a private bathing house. The Conolly family remained in residence until 1965. After a period of decline and private ownership, the Guinness family stepped in during the 1970s to fund a major restoration, eventually transferring the estate to the state in 1994.
Exploring the House
Guided tours are the only way to access the upper floors and state rooms, and they move at a comfortable pace with knowledgeable OPW guides. Highlights include:
- The Grand Staircase: A striking Portland stone cantilevered structure that anchors the entrance hall and sets the tone for the house’s architectural ambition.
- The Print Room: Ireland’s only intact 18th-century print room. Visitors can see the original cut-out illustrations that were once pasted into albums, a popular decorative pastime among Georgian elites.
- Long Gallery: Painted in a bold Pompeian palette of blue, red, and gold, this 80-foot space was designed for promenading and hosting large-scale entertainments.
- Red & Green Drawing Rooms: Former reception areas where visitors can view conserved 19th-century silk damask and period furnishings.
- State Bedroom: Furnished with Venetian chairs and Georgian textiles, this room once accommodated visiting viceroys and dignitaries.
Tours run daily from 15 March to 4 November 2026, at 10am, 11am, 12pm, 2pm, 3pm and 4pm. Tickets are sold at reception on arrival, but times and availability shift, so booking online ahead is the safer bet, especially at weekends. Arrive at least 15 minutes before your slot.
The Parklands & Grounds
Outside the house, the demesne runs down to the Liffey through a series of connected landscapes. The core demesne is about 120 acres; after the state bought the remainder of the estate in 2025 the holding in public ownership now comes to around 475 acres. Key features to look for include:
- Mrs Siddon’s Temple: A neo-classical folly named after the 18th-century actress, positioned to frame views across the water.
- Biodiversity Garden: A family area with planting beds, a fairy trail and open play space, though it has been closed at times, so check on arrival if it is the reason for your visit.
- River Walks: Paved and gravel paths follow the Liffey, passing the remains of Lady Louisa’s bathing house and offering quiet stretches away from the main courtyards.
- Seasonal Events: The lawn hosts concerts, monthly craft markets and heritage workshops through the year. Some need advance booking.
Dogs are welcome on a lead across most of the estate, but are not allowed in the lake area at all, at any time of year, because of nesting wildlife.
Practical Information
Opening hours
- Parklands: Gates open daily, 07:00 to 22:00, all year round.
- House tours: Daily from 15 March to 4 November 2026, at 10am, 11am, 12pm, 2pm, 3pm and 4pm (last tour 4pm). Times can change, so check the official website or call ahead.
Admission & Accessibility
The parklands are free. The house is seen by guided tour only: adult €10, senior/group €8, student €5, family €25, under 12s free; admission is free for visitors with disabilities and their carer. The OPW Heritage Card (adult €40, senior €30, student/child €10, family €90) covers a year’s free entry here and at all fee-paying OPW sites, so it pays off quickly if you’re touring several. Ground-floor rooms and the main exhibition level are accessible by lift, with wheelchair-accessible toilets near the entrance, but the upper floors and the Long Gallery are reached by steep stairs and are not suitable for visitors with limited mobility.
Facilities
The estate has free Wi-Fi, a gift shop, picnic areas and marked trails. The Courtyard café is closed and due to reopen in summer 2026 (date to be confirmed); in the meantime a coffee cart runs in the West Courtyard, Monday to Thursday. Baby-changing facilities are in the main toilet block.
Getting There
- By car: The M4 (Junction 6) leads to the main car park, which reopened on 21 December 2025 after a two-year access dispute. Parking is available on-site again, though it can fill on busy weekends.
- By bus: Dublin Bus C4 stops at Castletown Gates, a short walk from the main entrance. The Go-Ahead 120 also serves English Row, a 10-minute walk through the town.
- By train & bus: Alight at Hazelhatch station and take the W61 bus to Celbridge Main Street (stop 3907).
- By foot or bike: A pedestrian entrance runs from Celbridge’s main street along a lime-tree-lined avenue. Riverside footpaths link the estate to local cycling routes.
Nearby Attractions
If you have time to extend your day, several complementary stops are within a short drive or cycle:
- Carton House – A neighbouring Palladian estate turned luxury hotel, featuring manicured gardens and championship golf courses.
- Irish National Stud – Home to Ireland’s thoroughbred heritage, with museum displays, stud tours, and parkland walks along the Liffey.
- Celbridge – The town centre offers independent shops, historic churches, and easy access to the nearby Wonderful Barn and Ballitore Quaker village.
Book your house tour slot online before arriving, as daily visitor numbers are capped to protect the interiors. Arriving in the late morning on a weekday typically means shorter queues and quieter parkland trails.