Retaining Walls St Marys
Concrete sleeper and besser block retaining walls built for St Marys blocks and drained properly for heavy Cumberland Plain clay.
Retaining Walls in St Marys
St Marys sits on the Cumberland Plain, and the soil under most of the suburb is a heavy reactive clay derived from Wianamatta shale. It holds water for days after rain, then cracks open through summer. Add the older postwar subdivisions where the house pad was cut into a gentle slope and the rear yard steps down, and you get plenty of homes needing half a metre to a metre and a half of retention just to have usable lawn.
We build walls that take that clay seriously. Concrete sleeper walls on galvanised H beams, core-filled block walls, sandstone and low timber garden walls, every one of them with a slotted agi line in a bed of clean aggregate, wrapped in geotextile so the clay fines never choke the drain. Weep holes go into block walls, and the outlet is piped to a legal discharge point rather than left to soak away at the end of the run.
Retention over 1 metre, or any wall picking up load from a driveway, pool or the neighbouring block, is designed by a structural engineer and lodged with Penrith City Council where approval is required. Free on-site measure and fixed written quote anywhere in St Marys NSW 2760. Call 0492 879 796 to book yours.
Retaining Wall Services in St Marys
- Concrete sleeper retaining walls
- Besser block walls with weep holes
- Sandstone garden and feature walls
- Timber sleeper low garden edging
- Rear yard levelling and lawn pads
- Failed wall removal and rebuild
- Agi line, aggregate and geotextile
- Engineered walls over 1 metre
Retaining Wall Options in St Marys
Concrete Sleeper Walls
Termite proof and rot proof, the practical choice for St Marys back yards where treated pine has already given up once.
Block Walls
Core-filled besser with vertical bar and weep holes, used where a St Marys carport or shed slab sits hard against the retained face.
Sandstone Walls
Sawn block or random boulder sandstone for garden terraces that look at home against older St Marys brickwork.
Wall Rebuilds
We strip out leaning timber walls, re-cut the batter and rebuild with the drainage the original never had.
Drainage Packages
Slotted agi in aggregate, geofabric wrap and a piped outlet, the single detail that decides how long a clay-site wall lasts.
Fence Ready Walls
Walls detailed to take a Colorbond fence above so the boundary height is right without a second set of posts.
Retaining Wall Service Area Around St Marys
Retaining Walls St Marys FAQs
Why do so many St Marys retaining walls bulge or lean?
Because the clay behind them stays wet. Cumberland Plain clay drains very slowly, so rain that gets behind a wall stays there and pushes. Walls built with no drainage layer are effectively holding back mud, which weighs far more than the designer allowed for. We fix it with a slotted agi line bedded in clean aggregate, geotextile to stop clay fines washing in, weep holes through block faces and a pipe that takes the water off the site.
Is timber or concrete better for a retaining wall in St Marys?
Treated pine sleepers are the budget option and look fine around a garden bed, but in St Marys clay they sit in damp ground and typically last 10 to 20 years before rot or termites finish them. Concrete sleepers in steel H beams do not rot, are not attractive to termites and take the seasonal soil movement without warping. Besser block and sandstone last longer again. If the wall is holding a real level change rather than edging a garden, we steer people away from timber.
My neighbour and I share a level change, who builds the wall?
Retaining walls are not covered by the dividing fence cost sharing rules, so responsibility usually falls to whoever created or benefits from the change in level. In practice many St Marys neighbours agree to split the cost when the wall serves both yards, and it pays to put that agreement in writing before the excavator arrives. We are happy to quote the retaining wall and any fence above it as separate line items so each party can see what they are contributing to.
Can we put a fence on top of a new St Marys retaining wall?
Yes. The important thing is telling us before the wall is designed, because a 1.8 metre Colorbond fence adds significant wind load to the top of the structure. We either extend the retaining posts up to become the fence posts or core drill and grout posts into the top course of a block wall. Combining the two also means the fence line follows the wall exactly with no awkward step or gap underneath.
How do you price a retaining wall in St Marys?
With a fixed written quote after a free on-site measure. The measure is where we work out wall height and length, the material that suits the ground, how much excavation and spoil cartage is involved, whether a machine can get down the side of the house, and whether an engineer or council approval is needed. Everything including the drainage and the backfill is written into the quote before we start work.
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