Retaining walls Penrith

What sets the price of a retaining wall

The landscaper prices your wall at the site visit, from what they see on the block:

• The height and length of the wall, and the material (concrete sleepers, block or sandstone)
• The footings and posts, and how deep they need to go
• The drainage behind the wall: gravel, an ag pipe and somewhere for the water to go
• How much soil comes out, what the digging turns up, and whether an old wall has to be removed first
• Any steps built into the wall
• Access: whether a small machine fits through the side gate, or everything is carried up by hand
• An engineer's design, for a wall that needs one

Drainage on its own is priced the same way, from what the water needs: the length of pipe or drain, the pits, and the connection to your stormwater.

Retaining walls on a Penrith block

Much of Penrith sits on heavy clay that drains slowly and can stay waterlogged after rain. Water held in the clay behind a wall adds to the load on it, so a wall here needs gravel and an ag pipe (a slotted drainage pipe laid in gravel) behind it, leading somewhere the water can go.

Sleeper, block and sandstone walls

• Concrete sleepers slot between steel posts set in concrete footings. They suit straight walls along a lawn, a garden bed or a boundary, and are a common replacement for an old timber sleeper wall.
• Block walls come in two kinds. Split-face blocks stack without mortar for lower garden walls. Core-filled block (hollow besser blocks with steel and concrete inside) is used for taller walls that hold back more soil.
• Sandstone, as boulders or sawn blocks, is set in tiers on a slope with plants between the rows. For the planting, see Garden design.

Garden steps

Steps are built with the wall, in the same sandstone, block or concrete sleepers, where people already walk up the slope: from the back door to the lawn, or from the driveway to the front door. Each step is set to the same height, so nobody misjudges one. For the path at the top and bottom, see Paving.

Drainage for Penrith yards after storms

Clay takes in storm water slowly, so in a summer storm most of it runs across the surface. It pools on the lawn, sits against the house or under the patio, and builds up behind walls. Drainage gives it somewhere to go:

• an ag pipe in a gravel-filled trench, behind a wall or along the side of the house
• a strip drain, a narrow grated channel set into the paving at the edge of a patio or alfresco
• pits and pipes that carry the water to your stormwater system
• a new fall in the ground, so the yard sheds water away from the house

The water should end up in your stormwater pipes, not on the neighbour's block.

On the foothills, storm water also comes down the slope from the blocks above. Penrith City Council's draft 2026 study of local overland flooding covers Leonay and Emu Heights. There, the landscaper looks at where the water comes onto the block as well as where it pools.

Parts of Penrith also sit on the floodplains of the Nepean River and South Creek, and council's flood studies cover areas from Agnes Banks and Castlereagh to Emu Plains, South Penrith, St Marys and Erskine Park. On a block that floods, walls, paths and new levels are planned so they don't block the water or push it onto the neighbours. The landscaper checks your block at the site visit.

For levelling and new turf on clay, see Turf. For strip drains in a new patio, see Paving.

What happens after you ask

1. Send your suburb, the job and a rough length and height of wall, or where the water sits after rain. A low wall around one bed or a single drain is worth asking about. You hear back within 48 hours.
2. A local landscaper calls to book a visit. On site they check the slope, the soil, where storm water runs, access for a machine, and whether the wall needs council approval or an engineer.
3. You get a clear price and what's included, agreed before any work starts, and a time frame once they've seen the job.

Get a retaining wall quote →

Questions people ask