Further developed plans showing high-level design features such as doors, windows, walls, etc.
Preliminary Design is an early phase in the architectural design process where initial concepts and layouts are refined to create a more detailed visual and functional representation of the project. During this stage, high-level design features, such as the placement of doors, windows, walls, and key structural elements, are outlined to give stakeholders a clearer understanding of the building's layout and flow. These allow for initial cost estimates, feasibility assessments, and input from clients before moving to more detailed, technical phases of design.
In the preliminary design for an office building, architects would show the general arrangement of rooms, entrances, and window placements to help the client visualize the space.