Yes, we can if you are in our installation area. If we are doing the install, we do charge $30 extra for this type of install. If you are doing the install then it could be difficult without the right tools. We suggest you use a cement cutting saw and even a jack hammer. You will cut through the cement and install the post in dirt through the sidewalk and pour in the new concrete mix after you have put in the new post. Another option is to let us know the height of the post you need and we can get you a breakaway (surface mount) post. Recommended height is 41″-48″ from the road surface to the top of the mailbox. Let us know if you are on a curb with a sidewalk, or if you are ground level. We can then determine the proper post height needed.