Croxley Great Barn, although just outside the Parish boundary, is a hidden medieval monastic barn situated in Croxleyhall Woods built with timber felled in around 1397 and probably built by Abbott John Moote of St Albans Abbey between 1397 and 1401.
The Barn, probably one of the largest of its type in Hertfordshire, is about 31m long and 12m wide. With its weather boarded bays and aisles, peg hole tiled roof the barn exudes its place in history. It has sometimes been referred to as a tithe barn but these were used to store produce given to the parish priest by parishioners. But as the barn was built under monastery or abbey jurisdiction, tithes were not payable. A tithe was a one-tenth part of something, paid as a voluntary contribution or as a tax or levy.
The Barn has endured the elements of time well but restoration was needed and undertaken in the early to mid 1970s. Sited on private land now owned by St Joan of Arc School in Rickmansworth access to the building has been limited. However, together with the Rickmansworth Museum access to the barn has been agreed for certain days of the year. The Croxley Great Barn Tour Dates for 2017 are 29 April, 27 May, 24 June, 29 July, 26 August, 30 September and 28 October. To join the tour, arrive at Caravan Lane off Rickmansworth High Street (eastern end) adjacent to St Joan of Arc School at 10.45am. There is a 10 minute walk to the Barn from there and tours, which start at 11.00am, last about an hour. Please wear appropriate footwear as the lane can be quite muddy sometimes. Parking is available in the School car park.