Why choose Avenir Renovations?
Why attics and lofts are sensitive areas for heat loss
Located just under the roof, attics are directly affected by climate variations. Without effective insulation, they become a thermal sieve, both in summer and winter.
Heat escaping in winter
Warm air naturally rises. Without insulation, it escapes through the roof, forcing the heating to constantly compensate. This significantly increases energy consumption, as well as the premature wear of heating equipment.
By reducing these losses, you heat less and more efficiently, which directly lowers your bill.
Overheating in summer
In summer, uninsulated attics turn into ovens. This has a direct impact on the rooms below and on the comfort of the entire upper floor. Temperatures can exceed 35 °C without thermal protection.
Well-thought-out insulation helps regulate heat, even with strong solar exposure, and maintains a pleasant indoor temperature.
An untapped potential
Insulating the attic also prepares for future fit-out, creates a livable room, or enhances the overall efficiency of the building.
Even without an immediate fit-out project, insulation improves acoustic comfort, limits condensation, and protects the framework against extreme temperature variations.
Our insulation techniques tailored to your attic
Avenir Rénovations adapts the insulation method based on the configuration and usage of your attic.
Why choose Avenir Rénovations to insulate your attic?
An effective attic insulation relies on the right choice of technique, flawless execution, and professional oversight.
We inspect your attic to check:
- The condition of the framework
- Accessibility
- The presence of moisture
- The level of existing insulation
We offer you the most efficient and best-suited solution for your configuration, taking into account your priorities: comfort, savings, enhancement.
We use:
- Glass wool or rock wool for a good quality/price ratio
- Cellulose wadding for ecological projects
- PIR panels for low thickness needs
All our materials comply with PEB standards and are eligible for regional grants. They are chosen for their durability, thermal efficiency, and resistance to mold or rodents.
We assist you with:
- The preparation of the grant application
- Possible coordination with an attic fit-out
- Site monitoring and finishing touches
- Adherence to the schedule and safety standards
With Avenir Rénovations, you have a single point of contact for the entire duration of the project.
How much does attic insulation cost in Belgium?
| Type of attic insulation | Average price including tax / m² |
| Lost attics by blowing | 25 to 45 € |
| Convertible attics (interior) | 40 to 80 € |
| Insulation from the outside (sarking) | 90 to 140 € |
Prices depend on accessibility, the insulation material used, the areas to be treated, and any decorative finishes (ceilings, partitions, coverings...).
FAQ – attic insulation and energy renovation
What is the best insulation method for my attic?
If your attic is lost (not accessible), blowing is the fastest and most economical method. For convertible lofts, insulation between rafters or by sarking is preferred, especially if the roof needs to be redone.
The choice also depends on your goals: comfort, preparation for a future fit-out, or improvement of the energy performance score. Avenir Rénovations helps you make the right choice.
Does attic insulation qualify for subsidies?
Yes. Whether in Wallonia or Brussels, attic insulation is a highly subsidized item. You must meet performance criteria (minimum thermal resistance) and use an approved company.
A prior energy audit is often mandatory. We assist you at every step of the application.
How long do the works take?
- For lost attics: 1 day on average
- For convertible attics: 2 to 5 days
- In sarking: up to 2 weeks if combined with roof renovation
The works are planned to limit the impact on your daily life. We work cleanly and leave the premises in perfect condition.
Can we insulate already converted attics?
Yes. It is possible to add an additional layer of insulation under the slope or to remove the old panels to improve performance. We study each configuration to propose the most effective solution without major disruption.
Does good attic insulation also improve acoustics?
Yes. In addition to thermal comfort, well-executed insulation reduces external noise (rain, wind, traffic) as well as internal noise disturbances on the upper floors. This contributes to a calmer and more pleasant living environment.
Let your home breathe from the top
Insulating the attic is a cost-effective, quick, and efficient intervention to improve your comfort and reduce your bills.
Contact Avenir Rénovations for a personalized study, a free quote, and work done according to the rules of the trade. Give your home a better insulated, healthier, and more efficient roof all year round.
