Produced at a precarious moment in the history of the UK planning system, SUB-PLAN: A Guide to Permitted Development is a timely and pioneering investigation into the grey areas lying within the 'planning permission we already have'. Both a practical guide for the householder and an exploration of the limits of legislation.

Produced by visiting tutors and students at the Architectural Association Summer School. Tutors: David Knight, Finn Wiliams, Europa, with Ulf Hackauf, Jonathan Turney and Anders Stockman.

Published in September 2009. Buy it here or at the AA Bookshop.

David wrote an essay about SUB-PLAN for Architecture Today. You can read it here.