I am looking for a builder or architect to help me some retrofitting designs for my 1940s house (faces due west!). Hot in summer , cold in winter.I consider myself handy at most things - but major building works are outside of my experience. The main ideas are increasing natural ventilation, skylights, building a balcony on the west side, shades for the north side, multiple watertanks, and so on.... I recently read "Making your home sustainable" by Derek wWrigley. Great for ideas - although it suits latitude 35 S being cool/temperate best(we are about 28 S more sub tropical) Does anyone know where Dave Lawrence is? He is/was a retrofitter in the Byron Bay area some time ago (according to old permaculture mags) Any help appreciated.