Concepts Concept Design stage varies in complexity from simple layouts that are hand drawn, to fairly comprehensive plans of several levels of a house. We sometimes trace over existing measured drawings to get a few options of what can be achieved. It depends on your brief and the building we have to work with. Primarily a concept design is to refine the your brief….getting the brief to fit your site. Concepts are all to scale and with enough basic information that a builder can give a rough budget-estimate before you get too far into the documentation process.