Prepare retaining works with footing conditions, drainage and the intended finished levels understood from the outset.
Sloping blocks need structure, and Sutherland Shire Retaining Walls create flat, usable space while holding the ground securely. We prepare the excavation, footings and drainage so the wall performs for years, not just on handover day.
Send us your levels, wall height and material preference. Block, sleeper and concrete walls each suit different loads and budgets, and the right scope considers drainage, access and any approvals your wall may require.
Across Gymea, Kirrawee, Sylvania, Engadine and Cronulla, steep backyards are common. A well-built wall opens up your block for lawns, pools or driveways, with a clean, durable finish that suits your home.
Explore the scope ↓We excavate to the required depth and prepare solid footings, set out to your approved plans, wall height and levels, giving your retaining wall the strong foundation it needs to resist soil pressure and remain stable for many more years.
Proper drainage is essential, so we install subsoil drainage and gravel backfill behind the wall, connected to a suitable outlet or pit, relieving built-up water pressure and helping to prevent cracking, leaning or failure of your retaining wall over time.
Different materials suit different budgets and loads, from treated timber sleepers to concrete blocks and natural sandstone, so we build with the option that matches your site, appearance preferences and any engineering or approval requirements, so the wall performs well.
A wall holds back soil and the water in it. When drainage fails, pressure builds.
A proper wall has ag pipe, free-draining gravel and an outlet behind it. Ask how it will be built, not just what it looks like. Without drainage, water pressure builds after rain and can eventually push the whole wall over.
Clay backfill holds water. Free-draining material behind the wall relieves pressure. Filter fabric between the gravel and surrounding soil keeps fines out of the drainage layer, so the ag pipe keeps working for years instead of slowly clogging with silt.
The base has to bear on suitable ground. Ask whether an engineer needs to inspect the footing excavation. Soft clay, old fill or loose sand under a footing can let the wall lean, crack or settle unevenly over the years.
Walls near boundaries or buildings generally need approval and engineering. Check before you dig. Excavation close to a fence or footing can undermine it, so confirm the boundary by survey and discuss the work and access with neighbours before starting.
Drainage must go somewhere lawful, typically to the approved stormwater system. Never to the sewer. Discharging onto a neighbour’s land causes disputes and damage, so agree the outlet location and pipe route before the wall, drainage and backfill go in.
A driveway, pool, shed or rising slope behind the wall adds weight the design must allow for. Tell the engineer about anything planned above it. A wall designed only for level garden soil may move once heavier surcharge loads arrive later.
Common and strong, usually slotted between steel posts set in concrete footings. Post size, spacing and embedment depth come from the engineer or manufacturer’s tables, and posts need correct alignment before concrete sets or the sleepers will not fit properly.
Reinforced masonry walls are built on engineered footings and often suit taller or curved walls. Cores are filled with concrete around steel reinforcement, and the back face is waterproofed before drainage gravel and backfill are placed and compacted behind it.
Suits the Shire’s character, but stone size and stacking need engineering on taller walls. Sandstone from your own excavation can sometimes be reused, reducing cost, though blocks must be sound, free of cracks and large enough for the engineer’s design.
Cheaper upfront, but exposed to moisture and termites and generally shorter-lived. Use timber treated for in-ground contact, keep drainage working well behind it, and expect replacement sooner than masonry or concrete, especially on damp, shaded Shire slopes with poor drainage.
Low walls (generally 600 mm or less) can be exempt if conditions are met. Taller walls or those near boundaries generally need approval and engineering. Confirm the position with Council or your certifier before ordering materials or booking the excavator.
Run Dial Before You Dig and ask about private lines in the area to be excavated. Stormwater, sewer junctions, irrigation and garden lighting often run along fence lines and garden edges, exactly where many retaining walls end up being built.
Footings are dug to engineer or designer dimensions. Do not leave them open over rain or overnight unprotected. Water softens the base, and open trenches are a fall hazard, so cover, fence or pour them as soon as reasonably practical.
Where the design needs it, the engineer or certifier inspects before concrete. Book them early, keep the excavation clean and dry, and have reinforcement in place, because a failed inspection means delays and extra machine and crew time on site.
Ag pipe, filter fabric and free-draining gravel go in as the wall rises, with the outlet connected to an approved discharge. Compact the remaining backfill in thin layers behind the drainage zone, avoiding heavy plant close to the wall face.
Walls above roughly 600 mm or near boundaries and structures generally need approval and engineering. The excavation contractor prepares the base; the design belongs to a qualified engineer, and the certifier or Council confirms what approval and which inspections apply.
A retaining wall must hold back tonnes of soil for decades, so quality construction matters. Our retaining wall experts prepare the excavation, footings and drainage properly, giving your wall the foundation it needs to resist pressure and stay stable. We build with block, sleeper or concrete options to suit your site, budget and appearance preferences, and we work with any engineering or approval requirements. With local knowledge of Sutherland Shire sloping blocks and soil conditions, we deliver walls that perform as well as they look. You get a durable finish that creates usable space and protects your property for years.
Talk to our team ↗ Engineering design, boundary position and drainage outlets.
Ask us about your project ↗Low walls, generally 600 mm or less, may be exempt if conditions are met. Taller walls or walls near boundaries generally need approval. Check with Council or your certifier.
Drainage. Water building up behind the wall puts pressure on it.
Yes, to the designer’s dimensions, but the design and certification come from an engineer.
To an approved stormwater outlet per the plan. Never to the sewer.
Share the address, the access and the result you need.
Details first. Then a plan that suits the site.