Depending on your requirements, there are two standard sizes for bathroom windows in Lancaster, PA: 36 to 84 inches in width and 24 to 60 inches in height, if you are using sliding windows; and 24 to 96 inches in width and 12 to 96 inches in height, if you are using picture windows. To ensure you are getting the right window size for your bathroom, entrust the job of measuring for your new windows to the professionals.