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Thermal and acoustic insulation work from the inside helps preserve the exterior appearance of your home. You limit heat loss, which helps reduce your heating expenses while enjoying a more pleasant living environment. The budget to plan depends on the type of insulation chosen, the method of implementation, and the configuration of the building. A tailored estimate provides a precise idea of the cost of interior insulation. Avenir Rénovations guides you towards the most suitable solutions to optimize the energy efficiency of your house or apartment in Belgium.
The complexity level of insulation depends on the area of the home to be treated. The type of support (walls, roof, floor, attic, or basement) and its general condition directly influence the price of your energy renovation.
| Type of insulation | Average price per m² (installation included) |
| Attic insulation | 23 € to 47 € |
| Wall insulation | 26 € to 52 € |
| Floor insulation | 27 € to 60 € |
| Roof insulation | 35 € to 75 € |
| Basement insulation | 35 € to 115 € |
Get a realistic estimate by contacting a qualified professional like Avenir Rénovations Belgium.
Enhancing the insulation of internal walls is essential to reduce thermal losses and control heating expenses. This type of intervention also improves the comfort of the home and increases its value in the real estate market. Thermal insulation of walls from the inside is ideal when the exterior facade does not require renovation. In Belgium, the average cost of this work ranges from 26 to 52 € per m², installation included. Without labor, the price ranges from 11 to 22 € per m². According to energy experts, poorly insulated walls can lead to up to 20% heat loss, highlighting the importance of good insulation.
Convertable attics are characterized by a height under the rafters of about 1.80 m and a slope greater than 30%, making the space livable. Insulation is then applied along the slopes using panels or rolls of insulation fixed to the inside of the roof.
Lost attics, on the other hand, are too low to be converted and have a bulky frame. Their insulation is generally done by blowing in loose-fill insulation, a quick and effective method.
In Belgium, the cost of interior attic insulation ranges from 23 to 47 € per m² (installation included). For materials alone, budget 8 to 17 € per m², excluding finishes and cladding.
Since heat naturally rises, the roof represents a critical area for energy losses. Therefore, it is essential to insulate it well. The most common technique involves placing insulation between the rafters. This method is preferred for sloped roofs, while flat roofs are often insulated from the outside to avoid condensation.
The price of interior roof insulation in Belgium ranges from 20 to 100 € per m², including labor. Without installation, the rate drops to between 10 and 35 € per m². Before providing a quote, Avenir Rénovations conducts a complete diagnosis of the frame. The presence of moisture or mold may require prior treatment, sometimes resulting in additional costs.
The cold transmitted by the floor can lead to significant energy losses. Floor insulation aims to create a thermal barrier preventing moisture rises and temperature fluctuations. For a house built on a crawl space, synthetic insulations like extruded polystyrene (XPS) are preferred. If the crawl space is well-ventilated, natural materials can be considered.
In the case of a house on a solid slab, the work is more complex. In Belgium, the cost of interior floor insulation ranges from 27 to 60 € per m² including labor, and from 12 to 30 € per m² for materials alone.
If your home has a cellar or a semi-buried space, good insulation is essential. The exterior walls being in direct contact with the ground, it is necessary to anticipate moisture risks. Before installing the insulation, the walls, ceilings, and floors must be treated with a waterproofing product to ensure their tightness.
The average cost of interior basement insulation work in Belgium ranges from 35 to 115 € per m² including installation. Without labor, the rate generally ranges from 20 to 85 € per m².
The cost of interior insulation largely depends on the insulation material used. Each product has its own characteristics in terms of thermal performance, environmental impact, and budget. The choice of the right insulation material therefore depends on your priorities: energy efficiency, comfort, ecology, or financial accessibility. If you choose a natural and durable material, you benefit from a more environmentally friendly solution, but often a bit more expensive. As part of a quote prepared by Avenir Rénovations Belgium, our specialists guide you among the different options available and present you with detailed prices according to the chosen material.
A recognized specialist in energy renovation, Avenir Rénovations Belgique masters all interior insulation processes. Do not hesitate to contact our experts for a personalized and detailed quote. Depending on the type of insulation, the building configuration, and technical constraints, we will choose the most suitable method to ensure comfort, performance, and durability.
Interior insulation of walls or sloping roofs is generally done by integrating insulating panels between metal profiles that serve as support for the cladding. Easy to implement, this technique is effective for both new buildings and renovations. It is perfectly suited for semi-rigid insulators and rolls.
No machinery is required: the insulation is pressed against the wall and then held by the structure, onto which a plasterboard is then installed. This system allows for hiding electrical conduits and plumbing without piercing the insulation or weakening the walls.
The price of insulation on a metal frame in Belgium ranges from 15 to 30 €/m².
This method is often preferred for insulating lost or hard-to-access attics. It requires a specific device that propels the insulation in the form of flakes to distribute it evenly over the entire surface. Two technicians are generally involved: one feeds the machine while the other directs the projection hose.
Expect between 10 and 20 €/m² for this type of work.
A variant, called injection, involves injecting the insulation at higher pressure into wall cavities. It is ideal for cellulose wadding or other dense materials.
Spraying polyurethane foam is a modern method that is particularly effective. The insulation, applied in liquid form using a gun, expands upon contact with air and becomes rigid after complete drying.
Quick to apply, this technique offers a perfect seal by filling even the smallest gaps, whether on walls, floors, or in attics.
In Belgium, the rate for sprayed insulation ranges from 10 to 25 €/m², depending on the surface area and desired thickness.
Interior insulation by glued lining is recommended for flat and homogeneous walls. Widely used in new constructions, this method involves directly gluing rigid panels to the wall using mortar or special adhesive. These panels serve a dual purpose: insulation and interior finish.
They come in different versions according to needs (moisture resistance, acoustic insulation, vapor barrier). However, running electrical cables is less convenient with this technique.
The average price of glued installation varies between 15 and 30 €/m².
This technique involves placing insulating panels on wooden or metal battens, creating a non-ventilated air gap between the wall and the insulation. This void is essential when the wall is porous or exposed to moisture, as it helps maintain an optimal humidity balance.
The total cost depends on the type of insulating material chosen and site conditions, but it remains comparable to other interior insulation methods.
This traditional approach combines insulation and high-end aesthetic finish. The insulation is first placed on the wall, then covered with a partition made of plaster bricks or plasterboard, approximately 5 cm thick.
In addition to providing excellent thermal performance, this system allows for correcting irregularities in existing walls and achieving a surface ready for plastering.
The price of insulation with a masonry counter-partition generally ranges from 35 to 115 €/m², depending on the materials used.
Contact a RGE-certified company (Recognized Guarantor of the Environment) like Avenir Rénovations Belgique for your interior thermal insulation work. In addition to impeccable execution, you will benefit from regional energy grants, a reduced VAT rate, and comprehensive support for submitting your financial aid applications.
Our certified craftsmen ensure careful and durable services, covered by the ten-year guarantee. Improve the comfort and energy performance of your home today with Avenir Rénovations Belgique.
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