Placing Windows on Your Lot
Window ToolWindows section of the Object Catalog for details.
Windows come in various styles. There are small windows that are higher up that might be suitable for a bathroom or garage. There are big bay windows that might look best in a kitchen. It usually makes more sense for many of the windows of a home to have a similar style. This helps maintain a uniform look to your home. Sizes are currently from 1 to 3 tiles in width.
In Sims 3 many of the windows can be placed on diagonal walls. Experiment to see what you can achieve. To change the direction of the window, move the mouse slightly in one direction or the other to rotate the window.