Lower-end costs could be shoring up leaning fences, reworking patio areas (redesigning and repaving) a deck extension or a clean and stain to refresh it. Choice of materials can play a big part in the price of landscaping projects, does your design incorporate concrete, pavers, gravel or more expensive options such as sandstones or hand-laid slate pavers?
Large costs can be incurred if there is a pressing need to address significant issues such as property-wide drainage and water runoff, any needed property leveling, retaining wall construction, consents needed, and replacing/adding structures such as decks, fences and garden paths. The steepness of a yard and ease of access for materials and equipment can also play a part in affecting pricing. Temporary access tracks or build scaffolding to carry out certain parts of the work will increase costs.