Whether you are levelling a new house pad in Wilton, building tiered concrete sleeper boundaries in Picton, or replacing a leaning timber wall in Tahmoor, we connect Wollondilly property owners with experienced structural retaining wall builders.
Site measure, height check, and itemized linear-metre pricing across Wollondilly.
Reactive clay soils across Wilton, Appin, and Picton exert heavy lateral pressure after wet weather. Every wall is bored to engineered pier depths with proper hydrostatic drainage behind the face.
40–50 MPa steel-reinforced concrete sleepers set in hot-dip galvanised H-beams and C-channels. Termite-proof, rot-proof, and ideal for boundary fencing on top.
A-grade sawn or rock-faced Hawkesbury sandstone blocks laid with excavator grabs for natural acreage terraces, driveway batters, and feature entrances.
Split-face interlocking concrete blocks and core-filled Besser walls engineered for curved garden beds, pool surrounds, and stepped patio retaining.
Safe demolition and spoil removal of rotting pine sleeper walls, failing brick retaining, and bowing boundary structures without damaging neighbouring fences.
Post holes are bored to match wall height and soil class—preventing forward lean when Wollondilly clay swells after heavy rain.
Slotted 100mm agricultural pipe wrapped in geofabric sock and bedded in washed 20mm drainage aggregate relieves water pressure behind the wall.
Guidance on NSW exempt development height limits (up to 600mm/1m depending on boundary setback) and structural engineer sign-off for higher walls.
Supply and installation of engineered steel-post and concrete sleeper retaining walls typically ranges from $450 to $750+ per square metre of wall face depending on site access, rock excavation, drainage run-off, and whether a fence is mounted on top.
Under NSW State Environmental Planning Policy (Exempt and Complying Development Codes), retaining walls up to 600mm high (and at least 1m from a boundary) generally qualify as exempt development. Higher walls or walls supporting structures require structural engineering and CDC/DA approval.