Gabion, Crib & Block Retaining Walls
Compared with Reinforced Concrete (2026)

Gravity walls and RC walls: two different ideas

Every retaining wall is fighting the same thing: soil that wants to slide downhill, and water that makes it heavier. There are two ways to resist it. A gravity wall is heavy and wide enough that the soil cannot push it over or slide it forward. A reinforced concrete wall is slimmer, but its steel and its wide base, or heel, buried under the retained soil, let it resist far more load for its thickness.

Gabions, crib walls and segmental block walls are all gravity walls, and they share two useful traits: they tolerate small ground movement without cracking, and water drains through them rather than building up behind. They also share a limit: they need space, because they must be thick at the base to work.

The four types compared

Gabion walls

A gabion is a box of galvanised or coated steel mesh filled with hard, clean rock. Stacked in courses and usually stepped back into the slope, the baskets form a heavy, flexible wall that water passes straight through. As our retaining wall cost guide puts it, gabion walls are popular for landscaped gardens and are self-draining, which makes them well-suited to sloped sites.

• The base matters. Gabions sit on a levelled, compacted base; a soft or uneven base lets the wall lean.
• The mesh matters. The whole wall depends on the wire. Ask what coating the mesh has, because rusted wire lets rocks spill.
• The fill matters. Rock should be hard, angular and larger than the mesh openings, packed tightly so the baskets do not sag.
• Filter fabric behind. A geotextile between the gabions and the soil stops fine soil washing through.

Crib walls

A crib wall is a lattice of interlocking beams, precast concrete or treated timber, stacked like a log cabin and filled with free-draining material. The fill gives the wall its weight; the cribs hold the fill in place. The open face can be planted, which is why crib walls are common on embankments. Timber cribs are cheaper but rot in wet ground over time, so concrete is the durable choice for a permanent wall.

Segmental (interlocking) block walls

Segmental block walls use solid concrete units that lock together without mortar, each course set back slightly from the one below. Low garden walls rely on the blocks’ weight alone. Taller ones are reinforced with layers of geogrid, a strong plastic mesh laid between courses and extended back into compacted fill, turning the soil behind into part of the wall. Done properly, the result is neat and durable; done without the geogrid or compaction the design calls for, it bulges and fails.

Reinforced concrete walls

Reinforced concrete is the standard for high walls, for tight sites where there is no room for a thick gravity wall, and for walls that support a house, a car porch or a road. Our retaining wall guide notes that in the Klang Valley’s clay-heavy soils and heavy rain, RC or reinforced masonry is the standard choice for any wall above 1 m. The trade-off is that an RC wall is rigid and cannot drain through itself, so weep holes, gravel backfill and filter fabric are essential.

Drainage decides whether any wall survives

Water is what brings retaining walls down. Saturated soil is far heavier than dry soil, and water trapped behind a wall pushes on it like a dam. Gravity walls drain through their faces, which is their biggest advantage, but they still need filter fabric so soil does not clog them, and somewhere for the water to go at the bottom. RC and mortared block walls need weep holes, gravel backfill and filter fabric built in from the start. Our retaining wall waterproofing guide covers walls that stay damp.

When you need an engineer and approval

A retaining wall that fails can take a garden, a driveway or a neighbour’s house with it, so the rules are strict. Our retaining wall cost guide explains that a wall that forms part of a building structure, or retains more than 1 m of soil, must be designed by a Professional Engineer and submitted to the local authority before building. That applies to gabion and block walls too, not only RC. Walls next to a road reserve or in a strata or gated development need extra approvals.

How to choose

• Low garden terrace with space: gabion or segmental block, for looks and drainage.
• Planted embankment: concrete crib wall.
• High wall, tight boundary, or anything near a building or road: engineered RC.
• Unsure what the slope is doing: stop and get it assessed first; our slope erosion guide covers the warning signs.

What each type costs

These are the published Klang Valley ranges for 2026 from our retaining wall cost guide, supply and build per linear foot. Height, access and ground conditions move the price within each range.

How ClickBina can help

ClickBina is an experienced KL and Selangor contractor. Retaining walls are structural work, so the first step is always a look at the slope, the height and what the wall has to protect. WhatsApp us your job details for a quote: the length and rough height of the slope, what sits above and below it, whether there is an existing wall, and which type you are considering. We reply within the hour, the price we agree is a flat price with no hidden charges, and a site visit is RM150, waived if you go ahead.

Sources & official references

• ClickBina retaining wall cost guide — prices by wall type, engineer fees, the approval threshold and drainage.
• ClickBina retaining wall waterproofing and slope erosion guides — damp walls and slope warning signs.

How we estimated prices: every RM figure on this page is quoted unchanged from the ClickBina retaining wall cost guide. They are typical Klang Valley market ranges for 2026, not fixed rates.