Washington What You Should Know: Adding or changing openings in the exterior or centerline walls of your manufactured or mobile home is important to ensure the structural integrity of your home. Depending on the type of wall, the type of opening that can be added or changed will vary. For single-section homes, openings can be added or changed in both the exterior and centerline walls. Exterior wall openings can include single-or double-hung windows, sliding windows, and picture windows. Centerline wall openings can include single- or double-hung windows, sliding windows, and pre-hung doors. For multi-section homes, openings can be added or changed in the exterior walls only. Exterior wall openings can include single- or double-hung windows, sliding windows, and picture windows. In order to add or change openings in the exterior or centerline walls of your manufactured or mobile home, the following steps should be taken: 1. Ensure that the structural integrity of the wall is not compromised by the opening. 2. Ensure that the opening is properly and securely framed into the wall. 3. Install appropriate flashing and sealing materials to prevent water intrusion. 4. Install the window or door as per manufacturer's instructions. 5. Install trim around the opening to ensure a finished look. By following these steps, you can ensure that the openings in the exterior or centerline walls of your manufactured or mobile home are safe and secure.