Use a tape measure to determine the dimensions of a window frame from the inside and accordingly cut four pieces of iron; two for the window’s length and the other two for its width. These four pieces of iron are to be used for making the window guard frame.
Decide a suitable inter-bar difference for the guard. For instance, if you are making the guard for a 30 inches wide window and you want each iron bar to be at a distance of 6 inches from the other, you will need 4 iron bars. When cutting the bars, keep the length of each bar slightly shorter than the frame that you had made earlier. All four of these bars would be fitted inside the main frame for added security.
Make four marks on both the horizontal frame pieces; each mark at a distance of 6 inches from the other. These marks will guide you about the location where you will need to weld the iron bars.
Working on one iron bar at a time and weld all four of them in place.
In order to attach the window guards to the window frame, weld an attachment to each of the four corners. Four pieces of iron long enough to cover the distance between the window guard and the window frame would serve the purpose. Drill holes in each of the four attachments with an electric drill and then weld the attachments in place. Set the guard in position and secure it by driving screws through each of the iron attachments.
Repeat steps 1 through 4 in order to make iron guards for the doors.
Secure the iron door guard by welding hinges on one of its sides and a latch on the other side. The latch will be used for locking or unlocking the iron door guard.