A commercial site layout starts before the first parking stall or drive aisle is drawn. You need a usable base map, a sense of the existing grade, and a clear picture of the constraints that shape where development can go.

In this video, I walk through the early stages of a conceptual commercial site layout in Civil 3D. I use aerial imagery, public elevation data, AI assisted research, and a Site Investigation Report (SIR) to build a working framework for design.

How to Start a Commercial Site Layout in Civil 3D

Build the Base Map

I start by capturing aerial imagery through Civil 3D’s geolocation tools. The aerial gives me a visual reference for the property, surrounding roads, entrances, pavement, and sidewalks.

Next, I research available LiDAR and contour data. Public elevation sources can help reveal the general direction of drainage and identify areas that may need closer attention. After exporting contour data to DXF, I import it into Civil 3D and inspect how it lines up with the site. At this stage, the data helps guide a concept; it still needs to be checked against a survey before detailed design.

Set Up the Drawing for Design

A little drawing setup makes the rest of the layout easier to read and revise. I organize the aerial image on its own layer, set up viewports and layer templates, and adjust annotation scales and text styles.

I also customize Civil 3D label styles and precision so dimensions and elevations display in a useful format. Before moving on, I check the proposed building footprint’s dimensions, squareness, and angles. Catching a footprint issue now is much easier than discovering it after the parking and circulation have been laid out around it.

Put the Site Constraints on the Plan

Using the SIR as a starting point, I draw and offset the building setbacks shown for this concept: a 25 foot front setback and 30 foot side setbacks. I then add the perimeter Type A and Type D landscape buffers.

Putting these limits directly on the drawing makes their effect visible. For example, a landscape buffer may constrain where parking lot curbing can go. It is easier to work through that conflict while the layout is still flexible.

The SIR and public data are research tools for this preliminary layout. Setbacks, buffers, property lines, and other requirements should be confirmed with the applicable jurisdiction and project survey before they are used for final design.

Trace the Existing Features

Finally, I create a Z-WORK layer and trace the visible edge of pavement, entrances, and sidewalks. These features provide a practical starting point for thinking through access and how the new layout might connect to what is already there.

By the end of the video, the drawing has the basic framework for a commercial site concept: aerial context, preliminary topography, a checked building footprint, visible setbacks and buffers, and traced existing features. From there, I can start testing building placement, parking, circulation, grading, and stormwater space.