Gabion Garden Walls: Uses, Limits and Advice

A gabion wall is a structure made of galvanised steel mesh cages filled with stones. In a garden, it is used to hold back a slope, or to create a low wall, a bench, a fence or a privacy screen. It is free-draining, quick to build and natural in appearance, but it needs a stable, well-drained foundation, and a load-bearing structure must be designed by a professional.

What is a gabion and how does it work?

A gabion is a rectangular wire mesh cage, made of galvanised steel to resist corrosion. It is filled with stones and then closed. Several cages placed side by side and stacked on top of each other form a wall.

The principle rests on two qualities:

• Mass: the stones give the whole structure weight, which lets it resist the pressure of the ground behind it.
• Permeability: water passes through the structure, instead of building up behind it as it would behind a solid wall.

The mesh holds the stones in place and spreads the loads. It does not make up for a poor base: a gabion placed on unstable ground will move, however strong its cage.

Uses of a gabion wall in the garden

Gabions suit very different functions:

• Slope retaining: holding back sloping earth, or creating a landing or a terrace.
• Low walls: marking out a planting bed, a path or an area of the garden.
• Benches: a low cage topped with a timber or stone seat.
• Fences and privacy screens: a solid, opaque gabion wall between properties that shields you from view. For other ways of separating spaces, see fencing and metal trellis.
• Cladding: covering an existing wall, a utility room or a meter box to blend it into the surroundings.

Gabions fit well into an overall landscape design project, where they work alongside planting, paths and terraces.

Advantages and limits

What it offers

• Free-draining: water flows through, which limits hydrostatic pressure behind the structure.
• Quick to build: the cages are prepared and filled with no drying time.
• Natural appearance: stone blends in with a garden and ages well.
• Shelter for small wildlife: insects, reptiles and small animals readily take refuge in it.
• Can be planted: plants can settle in the gaps or at the foot of the wall.

What you have to accept

• A larger footprint than a thin concrete wall, which must be planned for from the outset.
• A stable, well-drained foundation: this is the condition for the structure’s durability.
• The choice of stone: it must be hard, frost-resistant and of a size suited to the mesh.
• A sometimes massive look, especially at a great height or on a small plot.

Gabions, blocks, concrete or rockery: a comparison

There is no single best solution: the choice depends on the height to be retained, the space available, the type of soil and the style you want. A tight plot with a large difference in level sometimes points towards concrete, while a natural garden sits very comfortably with gabions.

Building a gabion wall: the stages

1. Analyse the site: slope, type of soil, water flow, access for machinery and materials.
2. Define the function: simple decoration, a low wall, or a true retaining wall? This changes everything about the design.
3. Prepare the foundation: stable, compacted, drained and level ground on which the cages sit without deforming.
4. Plan the drainage: water must be carried away at the foot of and behind the structure so that it does not build up.
5. Assemble and fill the cages: the cages are assembled, laid in a staggered pattern if stacked, then filled with carefully packed stones.
6. Close and finish: closing the lids, finishing touches and any planting.

For a large slope or a load-bearing wall, the design cannot be improvised. It must be entrusted to a professional, or even an engineer, who will take account of the height, the pressure of the earth and the presence of water. The details of gabion and retaining wall work explain what this type of project involves.

The Geneva context

In Geneva, several features of the terrain and climate matter. The Lake Geneva climate alternates between summers that can be dry and sometimes sudden storms: water must be able to drain away without scouring or destabilising a structure. The bise, a cold, dry wind, exposes open gardens, and a solid wall can serve as a privacy screen and partial windbreak. Soils are often clayey, and therefore hold water and are sensitive to movement: drainage and the base are decisive.

Sloping plots are common, for example on the heights of the left bank, as in Cologny, or in the communes close to the Salève, as in Veyrier. On flatter, more urban plots, as in Carouge, a gabion is more often used as a low wall, a bench or a divider.

On the regulatory side, a wall may require a building permit in Geneva. It is wise to check with the relevant authorities before starting work; our guide to the building permit for garden structures in Geneva covers the subject. Managing surface run-off also matters: see how to manage rainwater in the garden.

Entrusting the project to a landscaper

A landscaper visits the site to look at the terrain, the slope, the soil and the way water flows, then proposes a suitable solution and prices the project in a detailed quote. To request a quote, describe your project: a qualified landscaper will get back to you within 24 hours for a free, no-obligation visit and quote.

Frequently asked questions

Can a gabion wall hold back a slope?

Yes, it is one of its common uses. For a large slope or a load-bearing wall, however, the structure must be designed by a professional, or even an engineer. The height, the type of soil and the water behind the wall determine the design.

Do you need a permit to build a gabion wall in Geneva?

A wall may require a building permit in Geneva. The answer depends on the structure, its height and its location. Check with the relevant authorities of your commune or the canton before starting work.

Which stone should I choose to fill gabions?

Choose a hard, frost-resistant, non-crumbling stone, of a size suited to the mesh. The stones must be large enough not to escape from the cage. Appearance matters too, since the stone remains visible.

Does a gabion need a foundation?

Yes. It needs a stable, compact, level and well-drained base, otherwise the cages will deform over time. It is one of the main conditions for the structure’s durability.

Can a gabion wall be planted?

Yes, plants can settle in the gaps or at the foot of the wall. This helps it blend into the garden. The wall also serves as a shelter for small wildlife, making it a useful feature for biodiversity.