Exterior wall renovation in Woluwe-Saint-Lambert

Our exterior wall renovation services

–  Complete diagnosis of cracks and appropriate structural treatment

–  Comprehensive treatment of rising damp and moisture issues

–  Complete facade renovation with full restoration of coatings

–  Complete repair and renovation of party walls and boundary walls

–  Water-repellent treatment and durable protection against the elements

–  Complete cleaning and anti-moss treatment of exterior cladding

What techniques to repair an exterior wall?

The choice of technique directly depends on the precise cause of the disorder identified during the initial on-site diagnosis.

Resin injection for structural cracks

This technique consolidates the wall from the inside, filling the crack deeply rather than merely masking the visible disorder on the surface.

Tank or drainage for rising damp

Depending on the precise configuration of the building, treatment by water-repellent resin injection at the base of the wall or peripheral drainage can effectively block the rise of moisture in the affected masonry.

Complete renovation for highly degraded facades

When degradation affects the entire surface, a complete restoration of the coating, after addressing the underlying causes, remains the most durable solution in the long term.

External insulation combined with renovation

When a complete renovation is necessary, it is often the right time to consider external insulation, which improves energy performance while providing lasting protection to the existing masonry of the building.

VAT and assistance for the renovation of an exterior wall in Brussels

The VAT at 6% applies to renovation work carried out in a property over 10 years old, including exterior wall repairs, under the usual conditions related to the registered contractor and the invoice.

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, can be mobilized if the wall treatment is part of a broader project including facade insulation.

Why choose Avenir Rénovations for your exterior wall?

An honest diagnosis before any intervention

We never propose an aesthetic renovation if the real cause of the disorder has not been addressed beforehand, which avoids having to redo the same work a few years later.

Techniques suited to each type of disorder

Injection, drainage, water repellent: we choose the technique based on the actual diagnosis observed on site, not a standardized protocol applied systematically to all encountered situations.

Particular attention to party walls

Party walls, common in the local construction, require coordination with the immediate neighbors that we facilitate when necessary for the smooth running of the project.

A guarantee on the work performed

Each structural intervention is covered by a complete ten-year guarantee, and water repellent treatments by a clear contractual guarantee that reassures about the actual durability of the intervention performed.

Diagnosing a crack or a party wall

A fine crack is not necessarily serious, but it always deserves a diagnosis to distinguish a non-serious surface crack from a structural crack that will continue to evolve if not treated in time. On a party wall, repair costs are generally shared between the two concerned owners, unless the disorder clearly originates from one side only; we help document the situation to facilitate this amicable agreement. Regarding permits, renovating a facade usually does not require any authorization, except for changes in color or materials visible from the public road, where a declaration may be required according to the current municipal urban planning rules.

Water repellent treatments and rising damp

Treating rising damp generally takes a few days for the intervention itself, but complete drying of the wall may take several months depending on the thickness of the wall and the level of humidity observed initially. The water repellent treatment, on its part, effectively protects against heavy rain, but does not resolve a problem of capillary rise or deep structural cracks: it is a complement, not a first-line solution to an existing disorder. Repainting a wall just after this treatment requires a prior drying time, generally from a few days to two weeks depending on the product used, ambient temperature, and current weather conditions.

Durably protect the envelope of your home

A well-maintained exterior wall protects the entire structure of the building, in Kapelleveld as in other neighborhoods of Woluwe-Saint-Lambert. The earlier the intervention, the simpler, quicker, and more economical the repair remains in the long term.

Also discover our outdoor fit-out work or our villa renovation solution for a completely renovated and coherent exterior.