Roof insulation is often necessary to improve the thermal and energy performance of a house. What budget should be planned for carrying out the work? This article on the price of attic insulation will help you estimate it.
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Isolation of attic contributes to better thermal and sound comfort in a house. And for good reason, the roof is the first source of heat loss in the house. Insulating attics thus reduces the loss of heat and saveenergy. If the price of attic insulation can be high, it is therefore an attractive investment. What budget should you plan for insulating the attic? Whether for a insulation of lost or convertible attics, we tell you everything about the attic insulation price.
What is the cost of insulating lost attic space?
The cost of insulation of lost attics is often lower than that of the insulation of convertible attics. The price of insulation for lost attics is generally estimated per square meter and depends on the technique used and the material insulation chosen.
Price of lost attic insulation per m²
In general, the insulation of lost attics is done by the installation of loose insulation or one insulating hard-faced, directly on the floor from the attic. Since the heat goes from the bottom to the top, insulating the attic floor helps conserve heat in living rooms.
On average, the price of the insulation of lost roof spaces is between 15 and 50 € per m² for the installation of insulation on the ground.
Price of thermal insulation for attics
If you decide to insulate lost attic space without calling in a craftsman, it is in your best interest to be well informed about the price of thermal insulation.
In order to insulate the lost attic, it is possible to use different types of insulation such as glass wool, cellulose wadding, fiber drink, hemp wool, rock wool or even mousse polyurethane. For roof insulation, the price of the glass wool is between 12 and 20 € per m² (excluding installation).
Here is a summary table of the prices of insulating materials for the attic:
| Insulating material | Insulation price for lost attics |
| Glass wool | Between 12 and 20 € per m² |
| Rockwool | Between 15 and 30 € per m² |
| Polyurethan foam | Between 25 and 75 € per m² |
| Wood fiber | Between 30 and 60 € per m² |
| Cellulose wadding | Between 20 and 35 € per m² |
| Hemp wool | Between 40 and 75 € per m² |
What is the cost of insulation for convertible attics?
Insulation of convertible attic space is essential to benefit from additional living space that is comfortable and pleasant to live in. If living spaces are not properly insulated, they will be very hot in summer, and much too cold in summer. winter.
According to the expected results in matter improvement of acoustic and thermal comfort, it is possible to undertake insulation work from the outside or the inside. The cost of the work will naturally depend on the technique chosen. On average, the cost of insulation for convertible attics varies between 20 and 200 € per m². In general, the insulation of convertible attics from the inside is much less expensive, but it has the drawback of reducing the interior space.
The following table shows you the price of insulating living space, depending on the method chosen:
| Roof insulation work | Attic insulation price |
| Insulation of convertible attics from the inside | Between 20 and 80 € per m² |
| Insulation of convertible attics from the outside | Between 80 and 200 € per m² |
| Insulation of the convertible attic at the level of the flat roof (interior) | Between 20 and 90 € per m² |
| Insulation of the convertible attic at the level of the flat roof (exterior) | Between 70 and 100 € per m² |
Roof insulation work is eligible for several aids and subsidies, making it possible to finance part or all of the cost of the roof insulation. Remember to find out about the various aids available, especially from your municipality.
Why ask for attic insulation quotes?
The price of insulation for lost or convertible attics varies from one craftsman to another, and depends directly on the complexity of the site.
Thus, the attic insulation budget depends on various factors, such as:
- the insulation technique used;
- thermal insulation or applied acoustics;
- the work to be carried out;
- the wall to be insulated and its surface;
- accessibility of the site;
- ancillary costs;
- the labor rate.
To refine the estimate made on the budget required for the work, it is advisable to request several attic insulation quotes, to compare the prices of craftsmen. The form below allows you to request several quotes for free to insulate attics.
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