Why choose Avenir Renovations?
Why insulate your walls from the inside
Improving the interior insulation of your home has many advantages, both in terms of energy efficiency and daily comfort. This solution is particularly suitable when external insulation is not possible or desired.
Reduction of heat loss
By limiting thermal exchanges between the inside and outside, internal thermal insulation (ITI) can reduce heat loss in a home by up to 25%. This results in a more stable indoor temperature and lower energy bills.
Enhanced thermal comfort
Well-designed internal insulation eliminates the feeling of cold walls and improves the uniform distribution of heat. This translates into better perceived comfort, in winter as well as in summer, in all rooms of the house.
Cost-effective and quick to implement solution
ITI requires less heavy equipment and can be completed more quickly than external insulation. It is an ideal solution for quick renovations or controlled budgets, while offering an excellent cost/performance ratio.
Steps of an internal thermal insulation project in French-speaking Switzerland
The success of an ITI relies on a rigorous methodology and professional expertise. Each step must be carefully planned and executed.
Different types of internal thermal insulation
Internal insulation can be achieved with various materials and techniques, depending on the configuration of the housing, the expected performance, and the available budget.
This method involves fixing a metal framework onto which panels or rolls of mineral wool are inserted, before being covered with a plasterboard. It offers excellent thermal and acoustic performance.
The glued lining is a panel made up of an insulating material and a plasterboard directly glued to the wall. This technique is quick to implement and particularly suitable for regular and well-maintained walls.
This solution involves constructing a new masonry partition in front of the existing wall, with insulation in between. It ensures great robustness, good thermal inertia, and excellent sound insulation.
How much do internal thermal insulation works cost in French-speaking Switzerland
The price of internal insulation depends on the type of insulation, the technique used, the surface to be insulated, and any finishing touches. The table below provides an average estimate to help you anticipate your budget.
| Type of service | Price per m² (CHF) | Average total price for 100 m² (CHF) |
| ITI with metal frame + mineral wool | 80 to 120 | 8,000 to 12,000 |
| ITI with glued lining | 70 to 110 | 7,000 to 11,000 |
| ITI with masonry counter-partition | 100 to 150 | 10,000 to 15,000 |
| Insulation with high-density rock wool | 90 to 130 | 9,000 to 13,000 |
| Insulation with bio-based materials | 110 to 160 | 11,000 to 16,000 |
These prices include the technical study, supply of materials, labor, and basic finishes. A personalized quote is essential to know the exact cost of your project based on its specifics.
Which insulation materials to choose for ITI in the French-speaking part of Switzerland
The choice of insulation materials is essential to ensure the durability and effectiveness of internal insulation. It depends on the desired performance, the constraints of the building, and the budget.
Glass wool
Glass wool is a commonly used insulation material for ITI due to its low cost and good thermal and acoustic performance. It is lightweight, easy to install, and non-flammable.
Rock wool
Denser than glass wool, rock wool offers excellent acoustic performance and high fire resistance. It is particularly recommended for buildings requiring enhanced insulation.
Bio-based insulation materials
Insulation made from wood fibers, hemp, or cellulose wadding is appealing due to its low environmental impact and ability to regulate humidity. They are suitable for eco-friendly renovations and timber-framed houses.
Options and finishes for a custom ITI
Interior insulation can be complemented by various options to enhance its performance or appearance.
Integrated vapor barrier
The vapor barrier limits the risk of condensation and protects the insulation from moisture. It is particularly recommended in rooms with high humidity, such as bathrooms and kitchens.
High-density boards
High-density plasterboards reinforce the structure of partitions, allowing them to support significant loads such as wall-mounted furniture. They also improve sound insulation compared to standard boards, providing superior acoustic comfort.
Integration of technical ducts
Interior insulation allows for the direct integration of electrical ducts, ventilation conduits, or piping. This solution simplifies renovations while ensuring a clean finish, with no visible networks on the walls.
Regulations for thermal insulation from the inside in French-speaking Switzerland
In French-speaking Switzerland, interior insulation work must comply with certain standards and legal obligations. These vary slightly depending on the canton and the type of building, but several points are common.
Work authorization
In most cases, interior insulation does not alter the exterior appearance of the facade and therefore does not require a building permit. However, in co-ownership or in a listed building, prior authorization may be required.
Compliance with thermal standards
The work must meet the requirements of the SIA 380/1 standard, which defines the minimum thermal resistance values to be achieved for opaque walls. These values ensure optimal and sustainable energy performance.
Moisture treatment
The ITI must necessarily include devices that limit the risk of condensation, especially in humid rooms. Maintaining the continuity of the vapor barrier is essential to avoid any subsequent degradation.
Work in co-ownership
If you live in an apartment building, the interior insulation of your home must be compatible with the technical and aesthetic constraints set by the co-ownership regulations. Some decisions require a vote at the general assembly.
FAQ on thermal insulation from the inside in French-speaking Switzerland
Is a building permit required for an ITI in Switzerland?
As a general rule, interior insulation does not require a building permit as it does not affect the exterior appearance of the building. However, authorization may be necessary in co-ownership or in a protected building.
What is the lifespan of interior insulation?
A well-executed and properly maintained ITI can last between 30 and 50 years. The quality of materials, proper implementation, and protection against moisture are key to ensuring this longevity.
Can an ITI be combined with other renovation work?
Yes, it is common to combine ITI with window replacement, electrical renovation, or refreshing paint. This helps optimize costs and reduce the overall duration of the project.
Does the ITI reduce the living space?
The installation of insulation and an interior finish slightly reduces the living space, generally by 5 to 7 cm per insulated wall. This compromise is largely offset by the gain in comfort and energy savings.
What is the best time to carry out an ITI?
Work can be carried out year-round, but it is preferable to plan the ITI during overall renovation periods or before winter to immediately benefit from energy savings.
Does interior insulation also improve acoustics?
Yes, most insulations used for ITI, such as mineral wool or rock wool, offer excellent acoustic performance. This helps reduce external noise disturbances and improve indoor comfort.
Interior wall insulation by Avenir Rénovations Switzerland
Thermal insulation from the inside is an efficient, economical, and quick solution to improve comfort and reduce energy expenses in your home in French-speaking Switzerland. Avenir Rénovations supports you at every step, from thermal study to finishing touches, ensuring careful work that complies with current standards.
Whether you are in Geneva, Lausanne, Neuchâtel, Fribourg, Sion, or Delémont, our local teams respond quickly to offer you tailored solutions that fit your budget and expectations. Contact us today to get a personalized quote and give your home new comfort while achieving sustainable energy savings.
