From 18th June 2012, new permitted development rules remove the need for planning permission for the installation of specified types of solar and microgeneration equipment on domestic properties in Wales www.legislation.gov.uk/wsi/2012/1346/contents/made

Installation of such equipmnet on non-domestic buildings comes under permitted development rights in Wales from 5th October 2012 www.legislation.gov.uk/wsi/2012/2318/contents/made

Rules on permitted development for installing microgeneration equipment in England came into force on 1st December 2011 for domestic properties www.legislation.gov.uk/uksi/2011/2056/pdfs/uksi_20112056_en.pdf

and on 6th April 2012 for commercial and industrial properties www.legislation.gov.uk/uksi/2012/748/contents/made