Why choose Avenir Renovations?
Why choose a pitched roof storey addition?
A pitched roof offers great potential for home extension, especially when the attics are little or not convertible. By raising the existing roof, you gain volume and comfort without moving or reducing your outdoor space.
The benefits of a pitched roof raise:
- Creation of a complete floor or converted attics
- Increase in living space without encroaching on the land
- Possibility to modernize the exterior appearance of the house
- Improvement of thermal and acoustic insulation
- Significant property value enhancement
This type of storey addition allows you to maintain the charm of a traditional roof while bringing a new dynamic to your home.
The steps of a storey addition project for a sloped roof
A storey addition project for a sloped roof requires thorough preparation and the intervention of experienced professionals. Here are the main steps handled by Avenir Rénovations Belgium:
What work is necessary for a sloped roof extension?
A roof raising project includes various trades. Here are the works to be planned:
- Removal of the existing covering (tiles, slates…)
- Reinforcement of the structure (walls, floors, framework)
- Construction of the peripheral walls of the new level
- Installation of a new framework and suitable covering
- Thermal and acoustic insulation
- Creation of interior partitions
- Electrical, plumbing, and heating work
- Installation of roof windows or dormers
- Plastering, painting, floor coverings
- Access stairs to the upper floor
- Integrated or custom furniture as needed
What budget should be planned for a storey addition of a sloped roof?
The cost of the storey addition depends on several criteria: area, materials, level of finish, type of framework, access complexity… Here is an indicative estimate for Belgium:
| Type of storey addition | Estimated area | Average price per m² | Estimated total budget |
| Simple storey addition with wooden frame | 30 m² | 1,800 – 2,500 € | 54,000 – 75,000 € |
| Storey addition with masonry or concrete frame | 30 m² | 2,500 – 3,500 € | 75,000 – 105,000 € |
| High-end storey addition with complete fit-out | 30 m² | 3,000 – 4,000 € | 90,000 – 120,000 € |
A personalized quote is necessary to accurately assess your project according to your house, location, and expectations.
What administrative procedures are required for a sloped roof storey addition in Belgium?
The procedures vary by region (Brussels, Wallonia, Flanders) but several points are common:
Mandatory urban planning permit
It is generally necessary, as the storey addition modifies the volume of the building. The file includes:
- Before/after plans
- Technical description
- Stability report
- Urban planning compliance sheet
Architect's intervention
The intervention of an architect is essential to ensure the structural and urban planning compliance of the project.
Declaration to the cadastre
Once the work is completed, you must update your cadastral file, which may impact your local taxation (property tax).
Why choose Avenir Rénovations Belgium?
By entrusting your project to Avenir Rénovations Belgium, you benefit from complete support, from the study to the final reception, with a single point of contact. Our strengths:
- All-trades company
- Dedicated Works Manager for each site
- Compliance with standards and deadlines
- Ten-year guarantee
- Custom solutions tailored to your home and budget
Our mission: to transform your roof into a living space without compromising on quality.
Get a free quote for your sloped roof storey addition project
Do you want to expand your house in Belgium upwards? Take advantage of expert support to realize your storey addition project.
Contact Avenir Rénovations Belgium to receive a free and personalized quote. A professional will come to your home to assess feasibility, advise you, and provide an accurate estimate for your project.
Request your quote now. Your new floor is no longer a dream; it can become a reality.
FAQ – Sloped roof storey addition in Belgium
Is it possible to raise a sloped roof without changing the exterior appearance of the house?
Yes, it is entirely possible to raise a sloped roof while maintaining its original appearance. The architect designs a project that respects the style of the house, using materials and a roof slope consistent with the existing structure.
Do I need to obtain a permit for a storey addition in Belgium?
Yes, an urban planning permit is mandatory for any storey addition project, as it modifies the height and volume of the building. Avenir Rénovations Belgium assists you in preparing the file and the administrative procedures.
What is the difference between a sloped roof storey addition and a fit-out of the attic?
The fit-out of the attic utilizes an already existing space under the roof. The storey addition involves raising the roof structure to create a new habitable floor, often when the current attic is too low or nonexistent.
What is the average time to complete a sloped roof storey addition?
The timeframe depends on the complexity of the project, but it typically takes between 4 to 6 months, including studies, obtaining the permit, and the construction work.
Can we live in the house during the work?
In some cases, part of the house may remain habitable. However, for safety and comfort reasons, it is sometimes recommended to arrange temporary accommodation during the major construction phases.
