I recently bought the July 2013 issue of Build It, in the letters section the star letter mentions an article in a previous issue about Insulated Concrete Formwork, I’ve had a look for back issues but they are all sold out. Does anyone have the list of contacts for ICF given in that article or any other good ICF contacts please?

Is it possible to add extensions onto ICF constructed houses after completion?

How does the cost compare with brick and block? I read that ICF is about 5% more expensive, is this just in material costs, because surely you will save a lot of money on labour with ICF as it is so much quicker to put up?