Roof raising in Braine-l'Alleud

Create habitable volume under your roof in Braine-l'Alleud

A well-designed storey addition transforms an unusable volume into a comfortable and bright living space. It is often the only option for Braine homeowners whose land no longer allows for lateral extension. Avenir Rénovations supports these ambitious projects from feasibility study to project completion. Contact us for a free initial assessment.

Storey addition and urban planning rules in Braine-l'Alleud

Any roof extension is subject to a planning permit in Braine-l'Alleud. The criteria analyzed by the municipal planning service are numerous: total height of the building after the extension, size in relation to neighbors, compliance with the municipal regulation on ridge heights, integration into the architectural fabric of the neighborhood, and roofing materials. In Lillois and Ophain, older developments have specifications that may limit the height of constructions or impose certain materials. Avenir Rénovations works with partner architects who are familiar with the specific regulatory requirements of Braine-l'Alleud to optimize the project before submitting the application.

The processing time for a permit for a roof extension is generally between sixty and one hundred twenty days in the Walloon Region. This timeframe should be integrated into the overall project schedule and construction should not begin before obtaining the permit.

Insulation and comfort in a raised volume in Braine-l'Alleud

A raised roof volume must be effectively insulated to be comfortable in winter and temperate in summer. This is a critical point that many underestimate.

Insulation of sloping roofs

The insulation in the roof (between and under rafters) must achieve a high level of thermal resistance (R >= 6 m²K/W minimum). Mineral wool, spray polyurethane, or rigid panels are the most commonly used solutions. Air tightness must be carefully managed (continuous vapor barrier) to avoid condensation bridges in the structure.

Ventilation of the new volume

The new living level must be integrated into the existing mechanical ventilation system or, if this system is insufficient, be equipped with its own ventilation solution. A roof volume without mechanical ventilation accumulates moisture and indoor pollutants much faster than a traditional space. This is a consideration to account for from the design phase of the extension.

Summer overheating under the roof

In summer, roof volumes exposed to the south or west can overheat significantly. For habitable attics created by a storey addition in Braine-l'Alleud, we recommend external solar protection (shutters on roof windows, external blinds, or secondary glazing) and effective night ventilation to expel heat accumulated during the day.

The storey addition as a solution to the constraints of Braine-l'Alleud land

Land in Braine-l'Alleud is expensive and available plots are becoming scarce. For homeowners who want more space without changing address or buying a neighboring plot, a roof extension is the only option that creates new living space without encroaching on the land. It is also a way to stay in a beloved neighborhood and in a house that suits the family in all other aspects.