Architect-designed house renovation in Woluwe-Saint-Lambert

Our services for architect-designed houses

–  Diagnosis of the architectural concept before any renovation project

–  Restoration of original materials, exposed concrete, wood or metal

–  Replacement of glazing with identical or discreet technical improvements

–  Interior insulation preserving original volumes and level changes

–  Renovation of technical installations without visual impact on the structure

–  Advice and support for permit applications in sensitive areas

The specific challenges of an architect-designed house

Unlike a classic villa, an architect-designed house imposes particular technical and aesthetic constraints at every stage of the project.

Large windows to preserve

These generous openings, often the visual signature of the original architectural project, must be improved thermally without altering their proportions or the overall appearance from the outside.

Exposed structures to handle with care

Beams, columns, or structural elements left visible by design require restoration or treatment techniques that respect their aesthetic function as well as their structural role.

Level changes and volumes to respect

The half-levels and through volumes characteristic of this architecture must never be partitioned or trivialized during a poorly prepared extension or interior fit-out project.

VAT and aids for the renovation of an architect-designed house in Brussels

The 6% VAT applies to renovation works in a dwelling over 10 years old, under the usual conditions related to the registered contractor, including for restoration works specific to this type of building.

Renolution grants remain suspended for invoices from 2025 and 2026, a decision confirmed by the Brussels government in February 2026. The ECORENO credit, relaunched in early 2026 by the Housing Fund at a reduced rate, remains available for items related to insulation, subject to technical solutions compatible with the architectural preservation of the building concerned.

Why choose Avenir Rénovations for your architect-designed home?

A attentive listening before any technical proposal

We never propose a standardized solution without first understanding what makes the building's real specificity, an approach that takes more time but avoids irreversible mistakes.

A network of craftsmen familiar with specific materials

Exposed concrete, solid wood, metal structures: our teams regularly work with these materials and are well-versed in the restoration techniques suited to each of them.

Support in permit application processes

Some architect-designed homes are subject to particular urban planning attention: we assist you in compiling the file to anticipate any specific requirements.

A photographic documentation before and after work

Each stage of the construction site is carefully documented, a follow-up particularly appreciated for this type of property where the traceability of interventions is also a selling point for future resale.

Heritage status and leeway on the built structure

Some architect-designed homes are classified or protected based on their heritage value recognized by the Brussels Region, a status we systematically verify before any project as it strongly conditions the possibilities for authorized interventions. Insulating this type of house without changing its appearance remains possible in most cases, through internal insulation that preserves the original exterior appearance, at the cost of a slight reduction in living space in the affected rooms. Keeping everything identical is not an obligation either: some elements can be modernized without betraying the spirit of the original project, provided that the choice is thoughtful and consistent with the rest of the existing architecture rather than imposed by default.

Identify the original architect and organize the construction site

The municipal urban planning archives often retain the original permit plans, a lead we can explore together to better understand the precise design intentions of the building. This type of project generally takes longer than a comparable standard renovation due to the time spent on diagnosis and finding compatible materials: expect often four to seven months depending on the exact scope of the chosen project. The involvement of an architect may also be mandatory depending on the extent of the work and local urban planning requirements; we work closely with partner architects experienced in this type of specific building.

An architectural heritage in good hands

Renovating an architect-designed house requires an attention that few general contractors take the time to provide, in Joli-Bois as in other neighborhoods of Woluwe-Saint-Lambert. The initial architectural diagnosis remains the best guarantee of a result faithful to the original intention of the designer.

Also discover our solution for installing large windows or our exterior wall renovation work to sustainably preserve your home's envelope.