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A local guide to Hills Shire Council retaining wall rules — what needs approval, what doesn't, and what it costs to get it right. Key Takeaways In the Hills Shire, a retaining wall generally falls into one of three categories: Exempt Development, Complying Development, or a full Development Application (DA) — and the category depends on more than just height. No DA or CC needed for standard timber/Colorbond/lightweight fences within these limits Prices vary a lot depending on