Donald Insall Associates is a firm of architects, designers and historic building consultants. They have worked on contemporary and historic listed buildings, monuments and sites throughout Britain, and at UNESCO World Heritage Sites including The Palace of Westminster, Cross Bath, the Tower of London, Kew Gardens and Caernarfon Castle. They were involved in the restoration of Windsor Castle following the 1992 fire. They have worked extensively in the adaptive re-use of historic buildings, contemporary interventions and new design. (Examples include the Copper Kingdom Visitor Centre at Amlwch, Anglesey.)