It is crucial to understand the meaning of these two approaches and how they differ from each other, to make a better decision for your interior designing work. Turnkey interior design solutions is where you give out all the responsibility to one person. You hire a contractor/agency and he/she is in charge of everything. It is his/her job to get the project completed. In, Design + Execution Interior Design model different responsibilities are assigned to different people. You hire an interior designer and the designer then appoints separate contractors and carpenters for execution of the project, which he/she would supervise and manage.