How precast compound walls are estimated
A precast (readymade) RCC compound wall is built from horizontal concrete panels stacked between vertical posts (also called poles or columns), set into the ground. The quantities follow from the wall's length and height: the number of bays is the length divided by the panel length, the number of posts is bays plus one, and the panels are bays multiplied by the number of rows needed to reach the height. For a 30 m wall at 1.8 m high with standard 2.13 m × 0.30 m panels, that is about 15 bays, 16 posts and 90 panels.
Why precast for boundary walls?
Precast compound walls are popular for plots, farms and commercial sites because they go up fast, need no foundation beyond post footings, use little water on site, and can be dismantled and relocated. They are usually cheaper and quicker than a conventional brick-and-plaster boundary wall for long runs, though brick walls offer more finish options.
What to confirm with your supplier
Panel length and height differ between manufacturers (7 ft × 1 ft is common but not universal), which changes the counts. Also clarify post embedment depth and whether a small concrete footing is needed per post, gate openings (which interrupt the panel run), and whether the quoted rate includes transport and installation or just the precast units.