This is the fifth list of corrections and additions to the third edition of my Dictionary. For the first time a section of ‘Additional Biographies’ has been included to provide details of some further architects active during the period 1600–1840, of whose careers enough can be reconstructed to justify giving them a place. The remaining sections are as usual lists of bare facts to be added, subtracted or amended.Attention should be drawn to the Biographical Dictionary of Architects at Reading by Sidney M. Gold, privately published at Reading, 1999, and to the Dictionary of Land Surveyors and Local Map-Makers of Great Britain and Ireland 1530–1850 by Sarah Bendall, published by the British Library, 1997.