A retaining wall with a fence on top is a structure built to retain soil or other materials and hold them in place. It can be made from various materials like concrete blocks, pavers, bricks, natural stone, or timber. A strong foundation and structural elements are essential for stability, including footings, stem walls, drainage systems, and reinforcement. Construction involves excavation, laying footings, building the wall, installing drainage, reinforcing, capping the wall, and installing the fence. Regular maintenance, such as inspecting for damage, cleaning debris, and sealing joints, is crucial for longevity. Legal considerations include adhering to building codes and involving professionals like engineers and contractors.