Visit our sites Bourn Windmill Help Bourn Windmill Bourn Windmill is one of the oldest windmills in England and is designated as an Ancient Monument. There are only 5 trestle post mills left surviving in the UK. Our charity has cared for this remarkable building since 1932. Like many ancient buildings, it needs constant repair and maintenance from specialist architects and craftsmen, which is expensive. We don't receive any regular funding for the care or repair of the windmill from local or national government or other bodies. This much loved building needs the support of people like you so that it can continue to be enjoyed by future generations. Please help to care for Bourn Windmill by: Making a donation, click here to donate. Volunteering your time or expertise to help, click here to find out how. Join our charity - your annual subscription supports our work, click here to join. Leaving a gift in your will to help ensure that future generations can enjoy the windmill, click here to find out how. We are incredibly grateful to everyone who helps to care for Bourn Windmill and preserve this unique part of our heritage.