Harmondsworth Barn

The exterior of Harmondsworth Barn.
The interior of Harmondsworth Barn.

Free Entry

Open second and fourth Sundays of the month between April and October, plus 16-17 September for Open House London


The Great Barn, Manor Court, High Street, Harmondsworth, UB7 0AQ

Before You Go

Rescued by English Heritage after years of neglect, this Grade I listed barn ranks alongside the Houses of Parliament and Westminster Abbey for its exceptional architectural and historic interest. It was dubbed the "Cathedral of Middlesex" by Sir John Betjeman.

Built in 1426 by Winchester College as part of its manor farm at Harmondsworth, the oak-framed barn is an outstanding example of medieval carpentry and contains one of the most intact interiors of its era. At nearly 60 metres long, 12 metres wide and 11 metres tall, with 13 massive oak trusses holding up the roof, both its size and aisles evoke the space and shape of a cathedral.

Managed by the Friends of the Great Barn at Harmondsworth.

Read more about the history of the barn.

Before You Go

Opening Times: The barn is open on selected days throughout the year. On 9 and 23 April it is open 11am-4pm. From May to September it is open every second and fourth Sunday of the month 10am-5pm. It is also open on Saturday 16 and Sunday 17 September 10am-5pm as part of Open House London. On 8 and 22 October it is open 11am-4pm. See details.

Access: The barn is accessible for wheelchair users.

Parking: There is a free English Heritage car park to the rear of the barn.

Facilities: There are no facilities on site. There are no public toilets in Harmondsworth village, but there are toilets in the nearby church hall which is open for part of Sunday mornings when the church is open, and there are two pubs within 200 metres of the barn.

School Visits/Large Groups: The barn can be opened by special arrangement for visits by educational and other groups. Phone 020 8759 1874.

Dogs: Assistance dogs allowed only.

Plan a Great Day Out

If you're heading back into central London after your visit to Harmondsworth Great Barn, make sure you visit Chiswick House & Gardens. Enjoy the grandeur of the upstairs rooms, take a stroll around the restored gardens, and refresh yourself in the wonderful café next door (not managed by English Heritage).

Your support helps in so many ways

Your membership provides valuable support for our essential work, while you can enjoy free access to the beauty and inspiration of our magnificent historic places. 


About us

English Heritage cares for over 400 historic buildings, monuments and places - from world-famous prehistoric sites to grand medieval castles, from Roman forts on the edges of empire to a Cold War bunker. Through these, we bring the story of England to life for over 10 million people each year. The English Heritage Trust is a charity, no. 1140351, and a company, no. 0744722, registered in England.

How We Are Funded

Our target is to become completely self-funding by 2023. Our confidence in achieving this is based on our track record. During the past 10 years, our commercial income has doubled and we have raised nearly £60m in donated income.

  • 66% Self-generated income
  • 20% One off capital grant
  • 14% Government funding
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