Retaining Walls Direct delivers concrete sleepers, galvanised steel H-beam and C-channel posts, drainage kits and retaining wall accessories to Mackay, Beaconsfield, Andergrove, Mount Pleasant, Sarina and surrounding areas across the Mackay region. We supply residential homeowners, landscapers, builders and civil contractors throughout Central Queensland.
Mackay's climate is tropical and subtropical, with a distinct wet season from December to April that can bring intense monsoonal rainfall and tropical cyclones. During severe weather events, this region can experience 200–400mm of rainfall in 24 hours. Hydrostatic pressure behind poorly drained retaining walls is the most common cause of wall failure. Proper drainage is non-negotiable in Mackay.
Important: Council approval thresholds, engineering requirements and QBCC licensing rules vary by wall height, location, soil type and proximity to boundaries. Always consult Mackay Regional Council or a licensed engineer before starting any retaining wall. Retaining Walls Direct is a materials supplier only.
Browse all concrete sleepers →
Concrete sleepers and steel posts are heavy and require specialist freight. Retaining Walls Direct dispatches via crane truck (Hiab) or flatbed. Delivery cost depends on your order volume, suburb and site access. Contact us for a freight quote →
Coastal and low-lying suburbs of Mackay sit on alluvial and sandy soils with variable drainage. Inland and elevated areas carry clay-heavy soils that expand significantly during wet season and contract in the dry — classic reactive soil behaviour. For reactive clay sites, post spacing should be reduced to 1.5m maximum and 50MPa sleepers are recommended. An engineer should assess walls over 1.0m on reactive clay.
Under the Queensland Building Act 1975, retaining walls over 1.0m generally require a building approval and a QBCC-licensed contractor. Walls within 1.5m of a boundary or with a surcharge load (driveways, structures) may need approval regardless of height. Contact Mackay Regional Council for your specific property requirements. QBCC licensing: qbcc.qld.gov.au
Every retaining wall in Mackay must include: 20mm drainage aggregate for the full retained height; slotted agricultural drain pipe at the base directed to a legal discharge point; geotextile fabric (min 140gsm) between backfill and drainage aggregate; and weep holes in the wall face at 1.8m centres. Browse drainage products →
For walls over 1.0m, a building approval from Mackay Regional Council is required under Queensland law. Walls near boundaries or with surcharge loads may require approval even at lower heights. Always check with council for your specific situation.
Hot-dip galvanised steel posts to AS 4680 are mandatory for all retaining walls. In coastal and marine-influenced areas, ensure galvanising is intact with no cuts or abrasion before installation. Browse steel posts →
Use 20mm drainage aggregate behind the full wall height, slotted ag-drain pipe at the base, geotextile fabric, and weep holes at 1.8m centres. Ensure the drain pipe discharges to a legal outlet and is not blocked by fine sediment.
Yes — we deliver to rural and semi-rural properties across the Mackay region. Access requirements affect delivery method and cost. Contact us to discuss your site.
Get a Free Quote → Call 1800 880 124
✓ AS 4678-2002 Certified Materials | ✓ Hot-Dip Galvanised Steel | ✓ Trade Accounts Available | ✓ ABN 98 351 143 900
All Concrete Sleepers | Steel Posts | Drainage Products | Delivery Info | Get a Quote