Why choose Avenir Renovations?
The Benefits of Loft Conversion
In many homes in Belgium, lofts represent untapped potential. When they are convertible, they allow you to increase your living space, improve quality of life, and significantly enhance your property value.
Why undertake this type of project:
- Gain space without external extension
- Meet new family or professional needs
- Improve the thermal and acoustic insulation of the home
- Increase the resale value of your property
- Benefit from a custom space, perfectly integrated with the existing structure
Convertible attics or lost attics: what you need to know
Before any intervention, our experts assess the nature of your attics to determine the feasibility of the project.
What rooms to create in the attic?
Attic fit-out offers remarkable flexibility. This new space can accommodate one or more rooms, depending on your needs and the layout of the area.
Add an extra bedroom or create a master suite with an integrated bathroom and custom storage.
Design a calm and bright workspace conducive to concentration, suitable for remote work or independent activities.
Provide your children with a dedicated, secure space isolated from the rest of the house, promoting autonomy and creativity.
With controlled insulation, ventilation, and evacuation, it is quite feasible to integrate a bathroom under the eaves.
Reading room, home cinema, gym, library, or creative workshop: let your imagination run wild.
Indicative pricing for works
Here is an overview of the prices generally observed for an attic fit-out in French-speaking Belgium. These amounts are given for informational purposes and may vary depending on technical constraints and aesthetic choices.
| Type of service | Average price including tax |
| Technical study and 2D/3D plans | 80 to 120 €/m² |
| Insulation of sloping roofs and floors | 40 to 70 €/m² |
| Installation of roof windows | 800 to 1,200 € / unit |
| Creation or reinforcement of load-bearing floor | 60 to 100 €/m² |
| Hatch + custom staircase | 2,500 to 4,500 € |
| Complete turnkey works | 900 to 1,500 €/m² |
| Bathroom under the eaves | 4,000 to 7,000 € depending on equipment |
A detailed quote will be provided free of charge after a site visit.
Our Methodology for Custom Fit-out
Avenir Rénovations Belgium relies on a rigorous process to ensure the quality, safety, and durability of the work:
Feasibility Study
We conduct a technical visit to check the structure, available height, condition of the framework, existing insulation, and accessibility.
Project Design
We assist you in defining your needs, designing the plans, and creating a 3D projection of your future space.
Administrative Management
We handle the necessary procedures with your municipality (urban declaration, building permit if required).
Execution of Works
Our team coordinates all trades: insulation, electricity, plumbing, partitioning, carpentry, heating, coverings…
Delivery and Finishing
We ensure a clean site, careful finishes, and a final reception that meets your expectations. All work is covered by our ten-year guarantee.
Our services for loft conversion
Our offer includes:
- Technical study and custom plans
- Reinforcement or creation of load-bearing floor
- High-performance thermal and acoustic insulation
- Creation of an opening and installation of a staircase
- Installation of roof windows (Velux type)
- Construction of partitions and technical networks
- Complete interior fit-out (floors, walls, ceilings)
- Integration of equipment (heating, ventilation, bathroom)
Why choose Avenir Rénovations Belgium?
- Belgian company certified for all trades
- Presence across the entire French-speaking territory
- Single project manager for smooth follow-up
- Qualified and experienced craftsmen
- Compliance with current Belgian standards (PEB, fire, acoustic)
- Commitment to quality, deadlines, and pricing transparency
- Ten-year guarantee on all completed works
Get your personalized quote
Are you considering converting your loft and want professional, clear, and comprehensive support? Contact Avenir Rénovations Belgium today. We will schedule a free, no-obligation technical visit, after which you will receive a detailed and precise custom quote.
With our expertise, transform an unused space into a real added value for your home.
FAQ – Fit-out of convertible attics in Belgium
What are the criteria for an attic to be considered convertible?
An attic is considered convertible if it has a sufficient height under the ridge (minimum 1.80 m), a roof pitch greater than 30%, and a non-intrusive traditional framework. Access to the attic must also be possible or feasible. If these conditions are met, the space can be transformed into a livable room.
Is a building permit required to convert attics in Belgium?
The interior fit-out of attics generally does not require a building permit, provided that the external structure of the house is not modified (roof, facade, volume). However, some municipalities may require a prior urban planning declaration. It is therefore recommended to check local regulations or to hire a company that handles these procedures.
What is the average cost for the conversion of attics in Belgium?
The average cost of converting convertible attics in Belgium ranges between 900 and 1,500 euros including VAT per square meter, depending on the complexity of the project, the materials chosen, and the desired fittings. This price generally includes insulation, electricity, the creation of a staircase, the installation of roof windows, and finishing touches.
Can a bathroom be created in a converted attic?
Yes, it is entirely possible to install a bathroom in the attic, provided that the necessary connections for water and drainage are planned, as well as an appropriate ventilation system. The fit-out of a bathroom requires special attention to insulation, humidity, and ceiling height.
Does the conversion of attics improve the energy performance of the house?
Yes. Converting attics allows for the integration of effective thermal insulation at the roof level, one of the most sensitive points for heat loss. By reducing energy losses, you improve the overall performance of your home and achieve heating savings.
What are the timelines for converting attics?
On average, a complete attic conversion takes between 4 and 8 weeks, depending on the area to be transformed, the work to be done (insulation, framework, staircase...), and the weather if external interventions are necessary. A precise plan is established in advance to ensure a controlled project.
Is it possible to convert so-called "lost" attics?
Lost attics, often featuring an industrial W-frame and low height, are not directly habitable. However, they can sometimes be transformed into convertible attics by modifying the framework or by carrying out a storey addition. A technical feasibility study is essential in this case.
What professionals are involved in the conversion of attics?
An attic conversion project involves several trades: carpenter, roofer, drywall installer, electrician, plumber, carpenter, painter... By hiring a general contractor like Avenir Rénovations Belgium, you benefit from a single point of contact who coordinates the entire project.
