Retrofitting a balcony
A balcony is more than just an additional outdoor area—it expands your living space, improves your quality of life, and can increase the value of your property in the long term. Especially in existing buildings without balconies, retrofitting one is an attractive way to create more light, air, and usable space.
However, for a balcony extension to be successful from a technical, legal, and financial perspective, careful preparation is required. This guide shows you which balcony solutions are suitable, what costs you can expect, and which regulations you need to observe in Switzerland. This will enable you to plan your project realistically and avoid unnecessary risks.
What costs can be expected for a balcony extension?
The cost of adding a balcony cannot be determined on a flat-rate basis. It depends on several factors that can vary greatly depending on the building and construction method. The decisive factors are not only the area, but above all the construction and the structural work involved.
Typical cost components are:
- Balcony material and construction
- selected balcony shape
- Dimensions and permissible load
- Structural assessments and approval procedures
- Railings, flooring, and balcony doors
- Assembly and labor services
Guideline values for material costs per square meter
Balcony type | from | to
Attached balcony | $1,000 | $1,600
Cantilevered balcony | $1,400 | $2,400
Suspended balcony | $1,300 | $2,200
Projecting balcony (self-supporting) | $800 | $1,300
Projecting balcony (partially self-supporting) | $1,100 | $1,800
Additional expenses and incidental costs
Service | from | to
Structural analysis | $400 | $800
Hourly rate for balcony builder | $80 | $105
New balcony door including wall opening | $6,000 | $8,000
Practical experience: For a balcony with an area of around 8 m², the total costs are usually around CHF 25,000. Depending on the type of construction, materials, and building situation, higher amounts are entirely realistic.
Balcony orientation: influence on use and comfort
The orientation determines how often and how comfortably a balcony can be used. Depending on the direction it faces, the amount of sunlight, temperature, and quality of stay change significantly.
- East-facing balconies are particularly suitable for people who appreciate morning sun.
- South-facing balconies offer long periods of sunshine and are ideal for sun lovers.
- West-facing balconies benefit from the evening sun and are perfect for unwinding after work.
- North-facing balconies receive little direct sunlight, but remain cool even in summer.
Statics: An essential basis for every balcony extension
Before a balcony can be planned or built, a structural assessment of the building is necessary. A structural engineer checks whether and how the balcony can be securely attached.
Among other things, the following are assessed:
- Load-bearing capacity of the facade and floor slabs
- Fastening and anchoring options
- Soil conditions and foundation requirements
- Loads due to use, furniture, and snow load
- Compliance with applicable standards and safety requirements
The structural analysis is a prerequisite for the building permit and should be considered a key investment. It determines safety and long-term usability.
Comparing materials: Which solution makes sense?
Since balconies are constantly exposed to the elements, the material plays a crucial role in terms of durability and maintenance.
steel
- high stability
- long service life
- high dead weight
- particularly durable
wood
- natural look
- comfortable running experience
- Regular maintenance required
- goes well with traditional buildings
aluminum
- light weight
- corrosion-resistant
- very low maintenance
- well suited for modern designs
The cost differences arise less from the material itself than from maintenance, service life, and installation costs.
Balcony types: Which design suits your building?
Depending on the structural conditions, different types of balconies are possible. Each variant has specific advantages and disadvantages.
Add-on balcony – solid and proven
Attached balconies stand on their own supports and are additionally fixed to the facade. This construction method is technically uncomplicated, very stable, and comparatively cost-efficient. It is particularly suitable for buildings with sufficient space on the ground floor.
Cantilevered balcony – without floor supports
Cantilevered balconies are attached entirely to the building structure and do not require any supports. They have an elegant architectural appearance, but place high demands on statics and load-bearing capacity. Their depth is usually limited.
Suspended balcony – visually light, technically sophisticated
Suspended balconies are additionally secured using tie rods or cables. This creates a floating impression. The construction requires precise planning and is also limited in depth.
Projecting balcony – independent of the facade
Projecting balconies are largely self-supporting via columns. They are ideal for buildings with weak or listed facades and can be planned flexibly—even in difficult structural conditions.
Building permit: Legal requirements in Switzerland
In Switzerland, a balcony extension is always considered a structural measure that requires approval. Depending on the municipality, a simplified procedure or a full building application may be required.
Among other things, the following are checked:
- Boundary and distance regulations
- Fire and noise protection
- Effects on facade and statics
- possible infringement of neighbors' rights
As regulations vary between cantons and municipalities, it is advisable to check with the relevant building authority at an early stage.
Conclusion: When is it worth adding a balcony extension?
A retrofitted balcony adds value to your home and significantly increases the attractiveness of a property. For the project to be successful, the design, structural engineering, choice of materials, and approval must be carefully coordinated.
Those who plan early, calculate realistic costs, and work with specialist companies will receive a durable and safe solution. This will turn your balcony into a genuine extension of your living space—functional, attractive, and retaining its value over the long term.
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