Owner-builder work is any which involves the construction of (or supervision of work on) a dwelling; or alterations, repairs or additions to it. This includes a house, garage, swimming pool and certain other structures and improvements.
ARTICLE : Water Treatment for Off-the-Grid Rainwater Harvesting Systems – Water Organizing Modules (WOMs) - permaculturenews.org
ARTICLE: Sustainable self-build homes - a likely future for Welsh developments? - energysavingtrust.org.uk