Call 811 or contact local utility companies to locate buried pipes and lines in the yard area to be excavated. Any electrical or water lines may require relocation prior to beginning the project.
Consult with a professional landscaping company concerning the type of soil present in the area to be excavated. The type of soil determines whether excavation can be a do-it-yourself project or require professional assistance.
Use a backhoe, excavator or shovel to remove black dirt, clay or other hard soils from the area. If the soil is sand, silt or other shifting or soft soil, contact a professional landscaping business to shore up or create walls to hold back the soil from the area.
Chalk mark around a steel-framed door on the interior wall. Select a steel-framed door the depth of the exterior wall. Place the frame against the wall and trace around with chalk.
Shrink the drawing of the frame by 3/4-inches. Use a measuring tape to make the drawing smaller by 3/4-inches on each side and down from the top.
Place a chisel along the interior edge of the marked line and hit with a hammer to create a hole. Repeat this action multiple times around the interior of the drawn frame.
Cut along the chalk line with a masonry grinder. Work slowly and stay to the interior side of the line.
Remove the remaining masonry with a hammer. Hit the interior of wall to knock out any remaining material.
Sand the frame using an orbital sander with 60-grit paper. Smooth the interior frame with the sander.
Place the steel-frame for the door in the opening and drill the holes for the screws. Use a drill with a diamond or masonry bit. Drill through the screw hole openings of the steel frame.
Screw the frame into the opening using concrete anchor screws. Be sure the anchor screws are the same size as the screw that came with the door from the manufacturer.