Stabilise and enhance your sloping terrain
Sloping ground is a daily reality in the Swiss landscape. Whether you need to retain an embankment, create terraced levels in your garden or mark your property boundary with a solid and attractive structure, gabions and retaining walls offer proven solutions. Contact SOS Jardin for a free quote — our professionals work across Western Switzerland.
What are gabions and retaining walls?
A gabion is a cage made of galvanised wire mesh filled with natural stones (limestone, granite, gneiss or pebbles). Stacked and assembled, gabions form robust walls capable of retaining soil while allowing water to drain through naturally. Their raw appearance blends perfectly into Swiss gardens.
A retaining wall is a civil engineering structure designed to hold back soil on sloping ground. It can be built from several materials:
- Gabions: cost-effective, free-draining and easy to plant up. Ideal for heights of 1 to 4 metres.
- Natural stone: dry-stone or mortared walls, typical of the Swiss landscape heritage. Attractive but more expensive.
- Reinforced concrete: for high walls or those subject to heavy loads. Usually requires a building permit and structural engineering calculations.
- Precast blocks: interlocking concrete elements, quick to install and available in various finishes (stone effect, smooth, textured).
- Wood (logs, sleepers): a natural solution suited to small garden level changes, but with a more limited lifespan (10 to 15 years).
Why hire a professional?
Building a retaining wall involves the safety of your property and sometimes that of neighbouring plots. A professional guarantees:
- A thorough site assessment: analysis of soil type, gradient, hydrostatic pressure and loads to be supported. In Switzerland, clay soils and shallow water tables require particular attention.
- Correct structural sizing: an undersized wall risks collapse, while an oversized wall leads to unnecessary costs. For structures over 1.5 metres, a structural calculation by an engineer is often required by cantonal authorities.
- Drainage: a retaining wall without adequate drainage is subject to water pressure that can destabilise it, particularly during snowmelt or heavy rainfall — both common occurrences in Switzerland.
- Regulatory compliance: setback distances from property boundaries, building permits and SIA standards (Swiss Society of Engineers and Architects).
- Sourcing local materials: in Western Switzerland, fill stones (Jura limestone, molasse, Alpine gneiss) are available from local quarries. A professional selects the stone type best suited to your structure and optimises transport costs.
- Managing surface water drainage: a poorly drained retaining wall is subject to dangerous hydrostatic pressure, especially during spring snowmelt in Western Switzerland. A professional systematically incorporates a drainage system (drain pipe, geotextile, drainage layer) to ensure the long-term stability of the structure.
Seasonal calendar for Western Switzerland
The construction of gabions and retaining walls is heavily influenced by Swiss weather conditions:
- April to June: the ideal period for building retaining structures. The soil has dried out after snowmelt, conditions are stable and earthworks proceed smoothly. This is also the time to submit your building permit application if required.
- July to September: conditions are favourable, though heat can make earthwork more demanding. Stone availability from quarries is generally good during this period.
- October to November: still a viable window, especially for gabions, which do not need curing time like concrete. Be mindful, however, of early autumn rains that can complicate excavation on clay soils.
- December to March: work is not recommended, particularly for reinforced concrete structures that cannot tolerate frost during curing. Gabions can theoretically be installed in cold weather, but excavating frozen ground is extremely difficult.
Important: in Western Switzerland, the snowmelt period (March–April) is critical for sloping terrain. If your embankment shows signs of instability (cracks, subsidence, unusual water flow), contact a professional promptly for an assessment before the situation worsens.
Gabions integrate perfectly into a broader landscape design project — for example, to create garden terraces, raised beds or borders for a wood or stone terrace.
How it works
Step 1: Contact us
Fill in our form or call us, specifying the type of structure you need (gabion, stone wall, concrete), the approximate length and height, and the nature of the terrain. Attaching photos of the site helps us produce an accurate quote.
Step 2: We visit and provide a free quote
Our team visits the site to assess the terrain and provide a detailed quote specifying materials, completion timeline and price, with no obligation.
Step 3: We carry out the work
Our professionals build your retaining structure to the highest standards, with rigorous site management through to completion.
Prices and rates in Switzerland
Costs depend on the type of wall, its height and length, site accessibility and the region. Here are indicative price ranges:
| Type of structure | Indicative price (CHF/m²) |
|---|---|
| Gabion wall (1 to 2 m high) | 200 – 400 |
| Gabion wall (2 to 4 m high) | 350 – 650 |
| Mortared natural stone wall | 400 – 900 |
| Dry-stone wall | 300 – 700 |
| Reinforced concrete wall (with formwork) | 450 – 1,100 |
| Precast block wall | 250 – 550 |
For a gabion wall 10 metres long and 1.5 metres high, expect a budget of CHF 3,000 to CHF 6,000 including installation. The price of fill stones varies considerably depending on whether local limestone or hand-selected pebbles are used.
Frequently asked questions
Do I need a building permit for a retaining wall in Switzerland?
As a general rule, retaining walls exceeding 1 to 1.2 metres in height require a building permit. The exact threshold varies by canton and municipality. For large-scale structures, plans drawn up by a civil engineer may be required. Your contractor will know the applicable rules in your area.
How long does a gabion wall last?
A properly built gabion wall using galvanised (or galfan) mesh lasts between 50 and 100 years. Stainless steel cages offer even greater longevity. The natural stone fill is virtually indestructible.
Do gabions require maintenance?
Maintenance is very limited. It is advisable to periodically check the condition of the mesh (for any corrosion) and to ensure that drainage is functioning properly. Over time, vegetation may naturally colonise the gabions, which further enhances their integration into the landscape.
Can gabions be installed on any type of soil?
Gabions adapt to most soil types, including unstable ground, thanks to their flexibility. However, very soft or clay soils may require a compacted gravel foundation or a concrete footing. A professional site assessment will determine the most suitable solution.
Are gabions an environmentally friendly solution?
Gabions offer several ecological advantages: they are permeable to water (no additional run-off), the stones are a natural and durable material, and the gaps between them provide habitat for small wildlife (lizards, insects). They can also be planted up to further boost biodiversity in your garden.
Can gabions be used as a fence?
Yes, gabions are increasingly used as an alternative to a conventional metal trellis fence. A gabion wall 1 to 1.8 metres high provides a solid boundary, sound insulation (useful along roads) and a natural privacy screen. They can be combined with sections of metal fencing or wooden elements to vary the visual effect and optimise the budget.
Which stone should I choose for gabions in Western Switzerland?
The choice of stone depends on the desired look and your budget. In Western Switzerland, the most common options are: Jura limestone (light grey, good value for money), granite (dark grey, very hard-wearing), gneiss (silver-toned, highly decorative) and river pebbles (rounded appearance, more expensive). Local stones are preferred to reduce transport costs and carbon footprint. The recommended aggregate size is 80 to 150 mm for optimal cage filling.
Can a retaining wall incorporate an irrigation system?
Yes, it is entirely possible to integrate an automatic irrigation system into the raised beds created by a retaining wall. Pipes and drippers can be installed at the same time as the structure, avoiding the need to dig later. This combination is particularly useful for terraced gardens, which are common on the hillsides of Western Switzerland (Lavaux, Valais slopes, shores of Lake Neuchatel).