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. During 2021 it is open from 11am to 4pm on the second and fourth Sundays of the month from 23rd May to October. It is also open as part of Open House London from 11am to 4pm on both Saturday 4th and Sunday 5th September. See details.
Parking: There is a free English Heritage car park to the rear of the barn.
How to Find it: The barn is accessed via the small spur road off High Street to the right of 'The Five Bells' public house. St Mary's Church will then be on the right and there is an information panel for the barn on its railings. The barn is through the gate at the end of the spur road.
Access: The barn is accessible for wheelchair users.
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).