The following text is from the original listed building designation:
TQ 4746 HEVER HOW GREEN
15/2003 Former Haybarn at Hever Lodge GV II
Former haybarn, now barbecue area. c1904 by J.L Pearson and part of the model farm complex to Hever Castle. Open structure on 9 tapering posts, all except the central post strengthened by passing braces. Tiled roof with half-hipped gables with louvred openings. Angled queen strut roof with windbraces to rafters.
Listing NGR: TQ4771746326

Update from current owner in July 2018: "there was a Minor Amendment to the records for Hever Lodge and the 4 associated buildings... on 27 February 2013. This amendment was to change the name of the architect from J L Pearson to Frank Loughborough Pearson (1864 to 1947). This is consistent with the RIBA drawings collection held at the V&A. Frank was the son of John Loughborough Pearson and the RIBA records clearly it was Frank who was the architect on the Hever farm projects. Mentioned in the Builder magazine of 1908 and Academy Architecture of the same year."

English Heritage, List of Buildings of Special Architectural or Historic Interest (Map). SKE16160.