About
Hillsborough Castle and Gardens is one of the most historically significant and beautifully presented historic houses in Ireland, a Georgian mansion of great elegance set within 98 acres of gardens and parkland in the attractive village of Hillsborough, County Down. Managed by Historic Royal Palaces since 2014, the castle serves as the official Northern Ireland residence of the Royal Family and the official residence of the Secretary of State for Northern Ireland, roles that have placed it at the centre of some of the most important political events in modern Irish and British history.
The house was built around 1770 for Wills Hill, 1st Marquess of Downshire and later Secretary of State for the American Colonies — a figure whose intransigence towards American grievances is considered by historians to have contributed significantly to the outbreak of the American Revolution.
The Georgian mansion, with its classically restrained exterior and richly furnished principal rooms, is complemented by gardens of great variety and quality, including a walled garden, a lake, woodland walks, and formal terraces. The castle has been at the heart of Northern Ireland's peace process: the Anglo-Irish Agreement was signed here in 1985 by Prime Ministers Margaret Thatcher and Garret FitzGerald, and the building has hosted countless meetings and negotiations in the decades since.
The wider estate includes Hillsborough Fort, a star-shaped artillery fortification of the 1650s that predates the mansion and provides a dramatic military contrast to the Georgian elegance of the house.
The nearby village of Hillsborough is one of the most attractive and complete Georgian villages in Ireland, with its Church of Ireland church, village square, and carefully preserved streetscape completing an outstanding ensemble of historic architecture and landscape.
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Plan Your Visit
⏱️ Recommended Visit Duration
💡 Visitor Tips
- Book tickets in advance online, especially for the castle interior tours — certain rooms can be closed for official functions, and the Historic Royal Palaces website gives the most current access information.
- Historic Royal Palaces membership is excellent value if visiting multiple HRP sites — it covers Hillsborough, Tower of London, Hampton Court Palace, and others.
- Allow time to walk the full extent of the gardens and to visit Hillsborough Fort within the grounds — these are separate from the castle interior tour and require no pre-booking.
- The village of Hillsborough itself is beautiful and free to explore; the Church of St Malachy and the village square are well worth a leisurely half-hour.
- Hillsborough station (Translink rail, Belfast-Dublin Enterprise line stop) is a 7-minute walk from the castle entrance — a convenient option from Belfast city centre.
- The walled garden restoration programme means some areas may be undergoing work; check the HRP website for the latest information about which garden areas are accessible.
- Photography is permitted in the gardens and at the fort; restrictions may apply in certain interior rooms — ask at the entrance.
Highlights
The Georgian Castle Interiors
The principal rooms of Hillsborough Castle represent one of the finest Georgian interior sequences in Ireland, furnished with state furniture, portraits, and decorative arts of the highest quality accumulated by successive owners and by the British government following the castle's acquisition as an official residence.
The grand hall, library, dining room, and drawing rooms retain much of their Georgian and Victorian character, with richly coloured walls, magnificent fireplaces, and carefully chosen historic furniture. The castle interiors have been enhanced by Historic Royal Palaces' sensitive conservation programme, which has restored historic paint colours and reinstated period furnishings while making the rooms more accessible and engaging for modern visitors.
The Anglo-Irish Agreement 1985
Hillsborough Castle has a unique place in the history of the Irish peace process as the location where the Anglo-Irish Agreement was signed on 15 November 1985 by Prime Minister Margaret Thatcher and Taoiseach Garret FitzGerald. The Agreement, which gave the Republic of Ireland an advisory role in Northern Ireland affairs for the first time, was one of the most significant steps towards the eventual Good Friday Agreement of 1998 and the establishment of the Northern Ireland peace process.
The castle also served as accommodation for negotiators during the various phases of the peace talks, and the rooms where history was made are interpreted with appropriate care for the significance of events that shaped modern Ireland.
Wills Hill, Marquess of Downshire and the American Revolution
The original builder of Hillsborough Castle, Wills Hill, 1st Marquess of Downshire (1718–1793), is a fascinating and somewhat controversial figure in eighteenth-century British and American history. As Secretary of State for the American Colonies from 1768 to 1772, his rigid insistence on Parliamentary supremacy over the American colonies and his opposition to colonial petitions contributed significantly to the deterioration of relations that led to the American War of Independence.
His dismissal from the colonial secretaryship in 1772 — five years before his name was given to the territory that became Hillsborough, North Carolina — came too late to reverse the course of events he had helped set in motion.
The castle thus connects directly to the origins of the United States.
The 98-Acre Gardens and Grounds
The gardens and grounds of Hillsborough Castle are among the finest accessible historic gardens in Ireland, extending over 98 acres of varied landscape that includes formal terraces, a walled garden under restoration, a serpentine lake, woodland walks, and extensive parkland. The walled garden, currently being restored by Historic Royal Palaces, contains a magnificent Victorian glasshouse and productive kitchen garden areas that recall the self-sufficient estate economy of the Georgian period.
The lake is beautifully set within the landscape and provides excellent wildlife habitat, while the woodland walks through mature specimen trees offer a peaceful counterpoint to the formality of the terraces nearest the house.
Collections
Hillsborough Castle's collections reflect its dual character as an historic Georgian house and an active working official residence. The castle holds important collections of state furniture, portraits of political and royal significance, decorative arts including silver, ceramics, and glass, and textiles that furnish the principal state rooms.
The portrait collection includes significant works documenting the political history of Ireland and the British connection.
Historic Royal Palaces has undertaken a systematic programme of research and documentation of the collections since taking over management in 2014, producing detailed records and interpretation that make the collection accessible to visitors and scholars. The grounds include the Hillsborough Fort, a scheduled monument of the 1650s, and the gardens constitute a significant landscape heritage asset in their own right.
Hillsborough Castle: Georgian Splendour and Modern History
Guided tour of the principal rooms covering the Georgian architecture and furnishings, the history of the Hill family, and the castle's role in the Northern Ireland peace process
The Gardens and Hillsborough Fort
Self-guided exploration of the 98-acre gardens, walled garden, lake, and the 1650s star fort within the grounds
Current Exhibitions
No current exhibitions. Please check the museum website for updates.