The late seventeenth century saw massive shifts in construction techniques and practice. This was particularly true in structural carpentry and owed much to the innovations of a single architect.

Sir Christopher Wren occupies a central place in English architectural history. Yet he was also a mathematician and it is reasonable to assume that he took more than a passing interest in the structural aspects of his buildings. Starting from the work of David Yeomans (1992 et al), this article considers his involvement in one particular craft, carpentry. By returning to the original documents and from careful measurement and recording of the surviving works and other buildings of the time, it reveals that his office had a far greater influence than hitherto supposed.