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Increasing the living space of a house is often the ideal solution for creating a new room, setting up a workspace, or improving the comfort of the home. In the French-speaking part of Switzerland, this type of project is also an excellent way to enhance your real estate assets. However, the final cost depends on many criteria: type of extension chosen, constraints related to the land, quality of materials, level of finishing, or complexity of the construction.
In general, an extension of 20 m² in the French-speaking part of Switzerland represents an investment ranging from 27,000 CHF to 80,000 CHF, with amounts varying according to the characteristics of the project. With Avenir Rénovations Suisse romande, discover the elements to consider when estimating the budget needed for a 20 m² extension.
The amount of an extension project primarily depends on the construction method, level of equipment, and technical constraints encountered. Several parameters can thus influence the overall budget.
The construction technique is one of the first elements that impact the price. Lateral extensions, built directly on the land, remain the most common solution as they combine affordability and ease of execution. In the French-speaking part of Switzerland, the average cost for 20 m² is between 25,000 CHF and 48,000 CHF, including materials and labor.
The house elevation represents an interesting option when outdoor space is limited. This technique involves creating an additional floor on the existing structure. Due to the necessary structural adaptations, the budget is generally higher. For an area of 20 m², you should budget around 35,000 CHF to 85,000 CHF.
The veranda is often chosen to bring light and openness to the outside. Depending on the material used (aluminum, wood, or PVC) and the desired level of insulation, the price can vary between 32,000 CHF and 65,000 CHF.
Finally, the conversion of attics often represents the most economical solution as it utilizes an already existing space. For this type of transformation, the budget generally ranges from 9,000 CHF to 24,000 CHF, depending on the initial condition of the framework and the necessary work.
The materials used directly influence the final cost, as well as the aesthetic appearance and energy performance of your extension.
A wood frame extension generally ranges from 1,200 CHF to 2,400 CHF per m². For an extension built with traditional masonry or concrete blocks, prices typically vary between 1,500 CHF and 2,600 CHF per m².
Cellular concrete, valued for its lightness and insulating qualities, represents an investment ranging from 2,000 CHF to 3,200 CHF per m².
As for the container extension, it can be considered for certain contemporary projects. However, it often requires specific adaptation, insulation, and finishing work. In the French-speaking part of Switzerland, its cost generally ranges from 1,300 CHF to 2,500 CHF per m², excluding particular constraints.
After a technical visit, our Project Manager prepares a personalized quote to accurately determine the overall cost of your project.
The price of an extension also depends on the level of finishing chosen.
A raw structure extension, without interior finishing or specific equipment, is the most economical solution. For 20 m², you should budget around 1,200 CHF to 2,400 CHF per m².
If you wish to include a bathroom, the budget increases due to the necessary technical installations (plumbing, ventilation, waterproofing). The price then generally ranges between 1,400 CHF and 2,800 CHF per m².
For a turnkey extension, fully finished and ready to use, prices range from 1,700 CHF to 3,300 CHF per m². This service generally includes insulation, electrical installation, floor and wall coverings, as well as all finishing touches.
To obtain a reliable estimate tailored to your home in the French-speaking part of Switzerland, contact Avenir Rénovations: we support you from project study to completion of the work.
To create a new living space and improve the comfort of your home, several expansion solutions can be considered. At Avenir Rénovations Suisse romande, we offer different approaches tailored to the configuration of your house, your land, and your budget.
The wooden extension is particularly appreciated in the Romandy region of Switzerland for its natural aesthetics and speed of construction. Thanks to the insulating properties of wood, this solution also offers excellent energy performance.
Our specialists design a 20 m² extension perfectly integrated into your home, respecting local standards and regulations. A detailed quote allows you to anticipate the overall budget and plan your project with peace of mind.
When the available space around the house is limited, elevation is a relevant alternative. This technique involves adding an additional level to the existing structure.
Avenir Rénovations Suisse romande takes care of the entire project: structural analysis, material selection, insulation, and finishes. This solution optimizes the living space while maintaining the original footprint of the house.
Creating a 20 m² veranda allows you to benefit from a bright and friendly space. Depending on your preferences, it can be made of aluminum, wood, or with a contemporary glass structure.
Our teams design your veranda taking into account the orientation of the house, thermal insulation, and material choices to ensure its durability. We also assist you with the necessary administrative procedures and provide you with a personalized quote.
Beyond the construction of the extension, we can also design a space fully arranged according to your needs.
Master suite, home office, extra bedroom, or independent studio: each project is studied to optimize space organization. With Avenir Rénovations Suisse romande, you benefit from a complete solution with careful finishes and support at every stage.
The realization of a house extension requires solid technical expertise. From project design, regulatory constraints, to coordinating various trades, each step must be carefully organized.
In French-speaking Switzerland, Avenir Rénovations supports you from the initial study to the final acceptance of the work.
To successfully enlarge by 20 m², it is essential to follow a precise organization that takes into account technical constraints, urban planning regulations, and your budget.
At Avenir Rénovations Suisse romande, we support you throughout all phases of the project.
Before starting the work, a feasibility study is conducted.
Our Project Manager visits your home for free to assess the existing structure and guide you towards the most suitable solution: ground extension, elevation, veranda, or wooden structure.
This step also allows us to anticipate constraints related to insulation, the land, and materials.
In French-speaking Switzerland, planning rules vary by municipality.
It is therefore essential to consult urban planning documents to comply with limitations regarding height, placement, or architectural appearance.
Depending on the nature of the work, certain permits may be required.
Avenir Rénovations assists you in preparing the administrative files to facilitate the progress of the project.
Once the permits are obtained, the work can begin.
Your Project Manager oversees the organization of the site, coordinates the various stakeholders, and ensures adherence to the schedule.
At the end of the work, a complete inspection is carried out to verify the compliance of the extension with the initial project.
Your Project Manager accompanies you during the site reception and ensures that everything meets the defined expectations.
A home extension project in French-speaking Switzerland
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In the Swiss Romandy, the cost of an extension depends on many factors: type of construction, chosen materials, level of equipment, and site constraints.
For a 20 m² extension, the average cost is around 1,600 CHF per m², with a range between 1,300 CHF and 2,800 CHF per m².
The total budget can therefore vary between 26,000 CHF and 56,000 CHF, depending on technical constraints.
A classic horizontal extension generally represents a budget between 27,000 CHF and 52,000 CHF.
A roof extension requires more structural adaptations and often represents an investment between 38,000 CHF and 85,000 CHF.
For a veranda, prices generally range between 1,800 CHF and 3,400 CHF per m², or 36,000 CHF to 68,000 CHF for 20 m².
A timber frame extension generally costs between 1,400 CHF and 2,600 CHF per m².
For a traditional masonry extension, expect to budget between 1,700 CHF and 2,800 CHF per m².
Foundations must always be considered in the overall calculation.
On stable ground, simple foundations generally represent a budget between 6,500 CHF and 13,000 CHF.
If the soil requires deeper foundations, the cost can reach 13,000 CHF to 27,000 CHF, depending on technical constraints.
| Item | Estimated cost |
| Timber frame | 1,400 to 2,600 CHF m² |
| Concrete block | 1,700 to 2,800 CHF m² |
| Veranda | 1,800 to 3,400 CHF m² |
| Cellular concrete | 2,100 to 3,300 CHF m² |
| Container extension | 1,500 to 2,800 CHF m² |
| Shallow foundations | 6,500 to 13,000 CHF |
| Deep foundations | 13,000 to 27,000 CHF |
The price of a 20 m² extension in the Swiss Romandy therefore depends on many elements.
To obtain an accurate estimate tailored to your home, contact Avenir Rénovations Suisse romande: we offer you a detailed quote corresponding to your project.
