Given the experience your hubby and son have, added to your (@Dutchess_III) willingness to add your “sweat equity”, I think you should be able to save a bundle over having the home built to be move-in ready. The (US) national average for union plumbers is over $20/hour, and for roofers it is over $30/hr (some roofing unions also allow their workers to work by the square, or per 100 sq ft.. Electricians get somewhere around $41—$45/hour. The general construction experience gained in your husband’s and your son’s trades will provide great insight into other aspects of construction, such as cabinet installation, interior trim, etc. I have no idea how to estimate the amount of work (in hours) your home will take, but I think you should be able to get an idea of the savings by the salaries.