Yes very true, and lumber is a sub-category inside materials and it is not very expensive compared to the other materials like concrete, siding (fiber cement, s

Yes very true, and lumber is a sub-category inside materials and it is not very expensive compared to the other materials like concrete, siding (fiber cement, stucco), roof material (metal, asphalt, tile), drywall, paint, plumbing, electrical. Of all those things lumber is a cheap line item.