| Maintaining high quality materials and workmanship | | | | | | |
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| Reducing the price of the house | | | | | | |
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| Environmentalism & sustainability | | | | | | |
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| Maximizing allowable building size/space | | | | | | |
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| Reducing the building time | | | | | | |
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| Pleasing the neighbours | | | | | | |
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| Simplicity of the buy/design/build process | | | | | | |
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