Why choose Avenir Renovations?
Why renovate an exterior wall?
Stop moisture
Exterior wall renovation begins by identifying the source of moisture. Water can enter from above when a coping or gutter is missing, from the face when the joints are eroded, or from below when the wall draws moisture from the ground.
Each of these problems requires appropriate treatment.
Insulate the coldest walls
A gable exposed to the west or a rear wall without insulation are often the coldest walls in a Leuven house. Insulating them improves the comfort of the affected rooms and the EPC label.
Depending on the case, we carry out external wall insulation, fill the hollow wall, or double it from the inside with materials compatible with an old wall.
Restore appearance
A repointed, cleaned, and repaired wall changes the image of the house or garden. Brick boundary walls, numerous behind city houses, deserve the same care as the facade.
Our solutions based on the type of wall
Renovating an exterior wall requires adapting techniques and materials to the nature of the substrate, its condition, and its exposure. Brick, stone, blocks, or exposed party walls, each configuration requires a specific intervention to sustainably protect the facade against moisture and degradation.
The advantages of entrusting your walls to Avenir Renovations
Entrusting your walls to Avenir Renovations allows for a precise diagnosis before choosing the most suitable techniques and materials. From identifying the causes of moisture to finishing, each intervention is coordinated to ensure a consistent, durable treatment that respects the nature of the support.
Moisture measured at various heights, condition of the joints, presence of salts, active or old cracks, probable source of water. Treating the symptom without addressing the cause means encountering the problem again two winters later.
Mortars, coatings, and paints chosen according to the wall, not based on a construction habit. A cement coating on an old stone wall, for example, traps moisture and eventually peels off.
Mason, facade worker, waterproofing specialist, and scaffolder operate under the same management. The diagnosis, the work, and the final inspection remain in the same hands.
What is the price of an exterior wall renovation in Leuven?
The price varies according to the material, the condition of the wall, the height, and the chosen solution. Estimates include VAT at a rate of 6% for a property over ten years old.
| Type of work | Factors affecting the price | Indicative price including VAT |
| Repointing of brick wall | Depth of joints, access, height | 50 to 95 € / m² |
| Injection against rising damp | Thickness of the wall, number of faces | 120 to 250 € / linear meter |
| Interior renovation coating after treatment | Height to treat, finishing | 60 to 110 € / m² |
| Lime repointing of a stone wall | Type of stone, condition of joints | 70 to 130 € / m² |
| External insulation with coating | Thickness, finishing, scaffolding | 130 to 200 € / m² |
| Protection of an exposed party wall | Cementing, cladding, or slates | 70 to 180 € / m² |
| Reconstruction of a boundary wall (including coping) | Height, length, foundation | 150 to 350 € / linear meter |
On-site, we start with measurements using a moisture meter at different heights and by closely examining the joints. The quote indicates the identified cause and the proposed treatment, item by item.
Example: for a city house in central Leuven affected by rising damp on eight meters of rear facade, the injection, interior renovation coating, and exterior repointing often total between 3,500 and 6,000 euros including VAT.
Procedures and grants for an exterior wall in Leuven in 2026
What can be done without permission
A cleaning, repointing, or identical repair generally does not require permission. A reconstruction of a boundary wall with a different height or appearance, especially at the roadside, should be verified before the work.
External insulation on the street side
External insulation or a change of appearance on the street side may require an omgevingsvergunning. For a building listed in the heritage inventory, the materials and colors are often regulated.
The grant for insulating a wall
Since March 2026, the Flemish grant for wall insulation is only accessible to income categories 3 and 4, meaning the most modest incomes. Treating moisture or just repointing is not subsidized, but benefits from the reduced VAT rate for a dwelling over ten years old.
Moisture, drying, and party walls
Injection against rising damp
It is effective when the diagnosis confirms rising damp. If the moisture comes from a gutter, from land higher than the interior floor, or from condensation, injection will not solve anything. Hence the importance of diagnosis.
Drying time
After treatment, a thick wall can take several months to dry. We generally wait before redoing the interior plastering, or we use a suitable renovation coating.
Never paint on a damp wall
Painting traps moisture and eventually causes bubbling. We first treat the cause, let it dry, then apply a mineral paint that allows the wall to breathe.
Maintenance of a party boundary wall
A party wall belongs to both neighbors, who typically share the maintenance. Before any work, it is better to discuss and agree in writing on the sharing of costs.
Duration of the work
A facade repointing takes a few days to two weeks depending on the surface area. External insulation with finishing takes one to three weeks, including scaffolding.
Frequently Asked Questions about Exterior Wall Renovation in Leuven
How to determine the source of moisture in a wall?
Through a diagnosis: measurements at different heights, observation of stains and salts, checking gutters and ground level. Stains at the bottom of the wall suggest rising damp, while stains higher up indicate infiltration through the facade or roof.
How to treat white stains on a brick wall?
These efflorescences come from salts that water carries as it dries. They are brushed dry, the wall is allowed to dry, and most importantly, the cause of the moisture is addressed. Washing with large amounts of water often brings them back, as the water brings new salts to the surface.
Can you repoint a wall in winter?
It is better to avoid it. Fresh mortar that freezes loses its strength and disintegrates, and rain washes out the joints before they have set. Therefore, repointing is scheduled between spring and early autumn, in dry weather with no frost forecasted.
Does a brick wall need to be waterproofed?
Not systematically. A breathable water repellent protects a facade that is very exposed to rain, but it never replaces repointing when the joints are damaged. It is applied to a healthy and dry wall.
Get your walls diagnosed
Moisture in a wall does not disappear on its own. A clear diagnosis allows for intervention in the right place, with the right technique, and avoids unnecessary treatments.
The visit is free and without obligation.
Agency Avenir
Rénovations
for Exterior wall renovation in Leuven
An expert to take charge of your renovation projects and guarantee deadlines, budgets and quality of all services.
