To be able to protect your welfare as home builders in Austin TX build your custom home, there should always be an agreement that is set in place. There should always be a contract set in place in order to protect your interests as home builders in Austin TX build your custom home. As home builders in Austin TX build your custom home, there should always be a contract set in place in order to protect your interests. You will have little difficulty monitoring your budget and keeping costs in line by having the proper agreement format set up, and this will also let your contractor understand what you expect out of the endeavor being finished.