Straw Bale Theatre Costings
The following costs do not include labour, glass, stage lights, landscaping, the walkway or internal fittings. Excluding fees and VAT, the materials cost works out at around £122/m2. Adjusting the cost to take into account labour (which would maybe double it) and the insulated roof and fixtures and fittings involved in building a house, the costs are still pretty good - maybe £350/m2.
Analysing the straw bale walling costs, the materials costs are about half the cost of an equivalent timber frame wall. The fact that it is not less than this is partly due to the thickness of the render.