Follow up question: can a builder or someone knowledgeable about this stuff give me a rough break down (in percentages) of where the ~$300/sf gets spent on a new design/build? Like is it 10% for the foundation, 40% for the framing/shell, 30% finishes and 20% systems for heating/cooling/electric? Or are there any basic rules that apply here? Just curious as to where the money goes so I can maybe save money by doing some of it by myself or doing it in stages.