In Microsoft Word 2013 the default footer height is set at 1/2 inch. You can increase or decrease this value using the options in the "Header & Footer" section. Your settings will apply to each page of your Word document.
Open Microsoft Word to the document containing the footer you want to adjust.
Select the "Insert" tab located at the top-left corner of the program window.
Look to the "Header & Footer" section of the resulting menu bar. Click the "Footer" button and then select the "Edit Footer" option from the sub-menu that follows.
Select the "Design" tab that appears along the top of the program window.
Look to the "Position" section of the resulting menu bar and locate the "Footer from Bottom" option.
Click the upward-facing arrow to increase the height of the document footer, or click the downward-facing arrow to decrease its height.
Click "File" and select "Save" to confirm the change.