Visitors enter the museum through a welcome building on the footprint of an existing house (Blackthorn Grange) and cart shed. The house has been largely rebuilt in the Cornish vernacular with the retention its Yennadon stone, and follows the original window configurations with the exception of larger-scale glazing to the shop. The new retail space is double height and open plan, and is intended to feel warm, inviting and calm, with extensive use of scalloped oak joinery, patinated bronze on the welcome desk and shop fittings, and a blue lias stone floor. The use of English wood contrasts with the choice of South African yellowwood for the café, and some parts of the War Rooms.