Syon House is a Neoclassical house in London, London Borough of Hounslow, England, United Kingdom, and a filming location for Gosford Park (2001), Downton Abbey (2010-2015) and The Madness of King George (1994). Built in 1547-1552, it was designed by Robert Adam, and is Grade I listed. It is owned by Duke of Northumberland.
Location: Syon House, Syon Park, Park Road, London, London Borough of Hounslow, England, United Kingdom
Verified facts
- Located in Isleworth, London
confidence 75/100 · 3 independent sources · SRC-1558, SRC-1559, SRC-3899 - Designed by Robert Adam
confidence 85/100 · 3 independent sources · SRC-1558, SRC-1560, SRC-1561 - Built 1547–1552
confidence 80/100 · 4 independent sources · SRC-1558, SRC-1559, SRC-3801, SRC-3899 - Architectural style: Neoclassical
confidence 80/100 · 7 independent sources · SRC-1561, SRC-1559, SRC-6226, SRC-6227, SRC-9241, SRC-9807, SRC-9904 - Historic designation: Grade I listed
confidence 80/100 · 4 independent sources · SRC-1558, SRC-1559, SRC-5583, SRC-6228 - Appeared in Gosford Park (movie, 2001)
confidence 70/100 · 2 independent sources · SRC-1562, SRC-1563 - Owned by Duke of Northumberland
confidence 95/100 · 10 independent sources · SRC-1560, SRC-1559, SRC-6229, SRC-6230, SRC-9242, SRC-10161, SRC-12684, SRC-12944, SRC-13260, SRC-13709 - Appeared in Downton Abbey (tv, 2010-2015)
confidence 70/100 · 2 independent sources · SRC-4448, SRC-4320 - Appeared in The Madness of King George (movie, 1994)
confidence 75/100 · 3 independent sources · SRC-10401, SRC-7456, SRC-14280
Evidence & sources
- SRC-10161 — Essential History — Syon House: London's last great ducal residence (Tier 2, reference; retrieved June 2026)
- SRC-10401 — https://www.syonpark.co.uk/filming/as-a-location (Tier 3, reference; retrieved June 2026)
- SRC-12684 — Britain Express – Syon Park, History & Photos (Tier 2, reference; retrieved June 2026)
- SRC-12944 — Wikishire – Syon House (Tier 2, reference; retrieved June 2026)
- SRC-13260 — Number One London — Syon House (Tier 2, reference; retrieved June 2026)
- SRC-13709 — London Borough of Hounslow (council website, gov.uk) (Tier 1, reference; retrieved July 2026)
- SRC-14280 — Wikipedia — The Madness of King George (Tier 1, reference; retrieved July 2026)
- SRC-1558 — Historic England — List Entry 1080318, Syon House (Grade I) (Tier 1, official_archive; retrieved June 2026)
- SRC-1559 — Wikipedia — Syon House (Tier 3, encyclopedia; retrieved June 2026)
- SRC-1560 — Historic Houses — Syon House (Tier 2, institutional_page; retrieved June 2026)
- SRC-1561 — Encyclopaedia Britannica — Syon House (Tier 2, encyclopedia; retrieved June 2026)
- SRC-1562 — Syon Park official site — Filming & Photoshoots (Tier 1, official_site; retrieved June 2026)
- SRC-1563 — The Worldwide Guide to Movie Locations — Gosford Park (Tier 2, reference_site; retrieved June 2026)
- SRC-3801 — wikipedia.org (Tier 3, reference; retrieved June 2026)
- SRC-3899 — britannica.com (Tier 2, journalism; retrieved June 2026)
- SRC-4320 — visitbritain.com (Tier 2, journalism; retrieved June 2026)
- SRC-4448 — syonpark.co.uk (Tier 1, official; retrieved June 2026)
- SRC-5582 — Syon Park (official estate site) (Tier 1, institutional; retrieved June 2026)
- SRC-5583 — Syon House, Non Civil Parish – 1080318 | Historic England (Grade I listed building) (Tier 1, institutional; retrieved June 2026)
- SRC-6226 — Study.com — Architect Robert Adam: Biography & Designs (Tier 3, educational reference; retrieved June 2026)
- SRC-6227 — Artinside — Syon House (Tier 3, art/architecture site; retrieved June 2026)
- SRC-6228 — The History of Brentford — Syon House (Tier 3, local history reference; retrieved June 2026)
- SRC-6229 — Syon Park (official estate website) — Syon House (Tier 2, official property site; retrieved June 2026)
- SRC-6230 — VisitRichmond — Syon House & Gardens (Tier 3, tourism authority; retrieved June 2026)
- SRC-7456 — Filming Locations for The Madness of King George (1994) – The Worldwide Guide to Movie Locations (Tier 2, article; retrieved June 2026)
- SRC-9241 — Britain Express — Syon Park & Syon House (heritage travel guide) (Tier 2, reference_site; retrieved June 2026)
- SRC-9242 — Victoria County History — 'Heston and Isleworth: Syon House', A History of the County of Middlesex: Volume 3 (British History Online) (Tier 2, official_archive; retrieved June 2026)
- SRC-9807 — Audiala — Syon House, London: Visitor Guide (Tier 3, reference_guide; retrieved June 2026)
- SRC-9904 — Great West Way — Syon Park, House and Gardens (Tier 2, official_tourism; retrieved June 2026)
How we verify
Every fact above is independently corroborated by at least two reputable sources and
confidence-scored before publication. Claims that cannot clear that bar are withheld. We show the
street address only for non-residential public landmarks (museums, commercial and civic buildings,
publicly documented filming-location sites); the exact addresses of private residences and any
personal information are structurally barred from publication. Last reviewed June 2026.
Plan Your Visit
Hours: Season Mar–Oct. House: guided tours Mon/Tue (first 10:30am, last 2:00pm); self-guided Sun & Bank Holidays 10:30am–3:30pm (last entry 2:30pm). Gardens & Great Conservatory: Sun/Mon/Tue 10:30am–3:30pm.
Admission: House, Gardens & Conservatory: Adult £16.50 online/£17.50 door, Concession £15/£16, Child (5-16) £9.50/£10.50, Family £48/£49. Gardens & Conservatory only: Adult £7/£8, Concession £5.50/£6.50, Child £3.50/£4.50.
Frequently asked questions
Where was Downton Abbey filmed?
Syon House, in London, London Borough of Hounslow, England, is a real-world filming location used for Downton Abbey. This property has also appeared on screen in Gosford Park, The Madness of King George.
Where was Gosford Park filmed?
Syon House, in London, London Borough of Hounslow, England, is a real-world filming location used for Gosford Park. This property has also appeared on screen in Downton Abbey, The Madness of King George.
Where was The Madness of King George filmed?
Syon House, in London, London Borough of Hounslow, England, is a real-world filming location used for The Madness of King George. This property has also appeared on screen in Downton Abbey, Gosford Park.
Can you visit Syon House?
Yes — Syon House is open to the public. Hours: Season Mar–Oct. House: guided tours Mon/Tue (first 10:30am, last 2:00pm); self-guided Sun & Bank Holidays 10:30am–3:30pm (last entry 2:30pm). Gardens & Great Conservatory: Sun/Mon/Tue 10:30am–3:30pm.. Admission: House, Gardens & Conservatory: Adult £16.50 online/£17.50 door, Concession £15/£16, Child (5-16) £9.50/£10.50, Family £48/£49. Gardens & Conservatory only: Adult £7/£8, Concession £5.50/£6.50, Child £3.50/£4.50..
Who designed Syon House?
Syon House was designed by Robert Adam.
Where is Syon House located?
Syon House is located in London, London Borough of Hounslow, England.