Why choose Avenir Renovations?
Our services for attic insulation in Brussels
Depending on the configuration of your home, the condition of the attic, and your goals (comfort, savings, future fit-out...), we offer several types of suitable insulation.
Insulation of the attic floor (unconverted)
If the attic is not used as a living space, it is more efficient and economical to insulate the floor:
- installation of semi-rigid or rigid panels (mineral wool, PIR, EPS),
- blowing of rock wool or cellulose,
- double crossed layer for better thermal performance.
This type of insulation is quick to implement, highly effective, and compatible with regional aid.
Insulation of the roof from the inside (converted or convertible attic)
If the attic is inhabited or intended to be, insulation must be done in the slopes:
- installation of insulating panels between and under rafters,
- finishing with vapor barrier and Gyproc boards,
- solution suitable for irregular slopes, with low footprint.
We use high-performance, durable materials that comply with the requirements of the Brussels Region.
Insulation from the outside (sarking)
Less common but very effective, sarking involves insulating the roof from the outside:
- ideal in case of complete roof renovation,
- avoids any loss of living space,
- excellent in combination with new tiles or slates.
We recommend this solution only if you are planning a comprehensive renovation of the roof.
The 5 steps of an attic insulation project with Avenir Rénovations
Avenir Rénovations insulates your attic in Brussels in 5 steps: diagnosis, technical choice, quote, compliant installation, and administrative support for sustainable thermal comfort and access to grants.
Why insulate your attic with a professional in Brussels?
Insulating your attic with a pro in Brussels guarantees comfort, energy savings, better energy performance certificate, and access to grants. A careful installation prevents heat loss and insulation defects.
Poor implementation can create thermal bridges, condensation, or reduce the effectiveness of materials. We guarantee a compliant and durable installation.
Insulating the attic significantly improves your energy performance certificate, an essential element in case of resale or rental. It is a strategic investment.
Up to 30% of heat loss occurs through the roof. Good insulation can save you several hundred euros per year on your heating bill.
The Brussels Region actively supports attic insulation. It would be a shame not to take advantage of it. We guide you to fully benefit from it.
How much does attic insulation cost in Brussels?
Indicative prices (VAT included)
| Type of insulation | Average price per m² |
| Blown rock wool (floor) | 25 to 35 € |
| Rigid panels on floor | 40 to 60 € |
| Insulation under rafters (converted) | 60 to 90 € |
| External insulation (sarking) | 120 to 180 € |
These prices include supply, installation, and vapor protection. A precise quote will be provided after the visit.
6% VAT
Applicable if your home is over 10 years old and the work is carried out by an accredited company. We apply this reduction when the conditions are met.
Renolution 2025 Grants
The Brussels-Capital Region offers significant financial assistance:
- Attic floor insulation: up to 30 €/m² (R3) – 60 €/m² (R2) – 90 €/m² (R1)
- Roof insulation (interior or exterior): same amounts
- Variable amounts depending on income category (R1 = low income, R3 = higher income)
- Requires a prior housing audit to obtain increased amounts
We assist you in this process to maximize possible aid.
Why choose Avenir Rénovations to insulate your attic in Brussels?
Our teams have a perfect mastery of insulation techniques in urban environments, including in old Brussels houses, terraced buildings, or complex roofs. By choosing Avenir Rénovations, you benefit from:
- a free thermal diagnosis,
- advice on the best performance/price ratio,
- a selection of materials suitable for the Belgian climate,
- careful, quick, and clean implementation,
- support for grant and housing audit procedures.
We operate in all municipalities of Brussels (Uccle, Schaerbeek, Ixelles, Anderlecht, etc.), with complete coordination of trades.
Concrete example of attic insulation in Brussels
Mr. and Mrs. Blaton, owners of a single-family home in Woluwe-Saint-Lambert, wanted to reduce their heating bill without undertaking heavy work. The unconverted attic represented a major source of heat loss.
Proposed solution:
- blowing 35 cm of rock wool onto the floor,
- installation of a vapor barrier,
- protected access for future interventions.
Area: 70 m²
Cost of work: €2,100 including VAT
Income category: R2
Grant obtained: €60/m² × 70 m² = €4,200
→ Work fully reimbursed thanks to the aids!
FAQ – Attic insulation in Brussels
Is attic insulation mandatory?
Not at this time, but strongly encouraged. Brussels authorities will gradually impose minimum energy performance requirements. Anticipating allows you to benefit from grants while improving your comfort.
Can I insulate my attic myself?
Yes, but the work must be carried out by a certified professional if you wish to benefit from the Renolution grants and the reduced VAT rate of 6%. Additionally, non-professional installation is often less effective in the long term.
Do I need to do a housing audit?
The housing audit is mandatory to access the highest grant amounts. It must be conducted before the work. We can connect you with a certified auditor.
Which insulation should I choose for my attic?
It depends on the configuration. For a floor: blown rock wool or PIR panels. For slopes: wood wool, semi-rigid panels. For the exterior: rigid panels in sarking. We guide you towards the best performance/cost compromise.
What is the duration of the work?
Between half a day and two days depending on the chosen method. Blowing is the fastest. Insulation under slopes requires more finishing (battens, plates, etc.).
Entrust your attic insulation to Avenir Rénovations Brussels
With Avenir Rénovations, you significantly improve the energy efficiency of your home while benefiting from professional support, high-performance materials, and quick installation. Enhance your property, reduce your bills, and take advantage of the available aids in Brussels.
Request your free quote today for attic insulation in Brussels.
Agency Avenir
Rénovations
for Attic insulation in Brussels: improve your thermal comfort and reduce your bills
An expert to take charge of your renovation projects and guarantee deadlines, budgets and quality of all services.
