Why choose Avenir Renovations?
Why renovate an exterior wall in millstone?
1. Enhance architectural heritage
The millstone brings character and value to your property. By restoring your façade, you enhance not only its aesthetics but also your real estate heritage.
2. Prevent infiltrations and disorders
Over the years, the millstone and its joints can become porous, promoting:
- Water infiltrations
- Freeze/thaw
- Crumbling of stones
- Development of mosses or lichens
A renovation allows for restoring the waterproofing and strength of the wall.
3. Comply with urban planning regulations
In many Belgian municipalities, especially in classified areas or preservation zones, the restoration of a millstone wall must be done in accordance with original materials and traditional finishes.
Steps for renovating a sandstone wall with Avenir Rénovations Belgium
Renovation of a sandstone wall with Avenir Rénovations Belgium: complete diagnosis, cleaning, lime repointing, consolidation, and finishing touches.
Signs it is time to renovate your flint wall
- Missing or excessively cemented joints
- Black stains or signs of moisture
- Crumbly or flaking flint
- White efflorescence on the surface
- Asymmetry between restored and old areas
Price of renovating a sandstone wall in Belgium
The restoration of a sandstone wall requires specific expertise and the use of compatible materials with this type of stone. The price varies depending on the condition of the wall, the chosen techniques, and the expected finishes.
Factors influencing the price
- Extent of damage: missing joints, crumbling stones, moisture
- Total surface area to treat: economies of scale on large facades
- Cleaning techniques used: manual, micro-sanding, gentle sandblasting
- Accessibility: height, need for scaffolding, party wall
- Desired finish: patina, water repellent, lime wash
- Replacement of stones: if some stones are too damaged
Average observed price (including VAT, installation included)
| Type of service | Average price per m² |
| Cleaning of sandstone | 20 € to 40 € / m² |
| Lime repointing | 50 € to 80 € / m² |
| Water repellent treatment or mineral wash | 15 € to 30 € / m² |
| Spot replacement of stone | On estimate (piece by piece) |
| Personalized global estimate | Free after on-site visit |
Specific techniques for millstone
| Technique | Function |
| Lime NHL repointing | Preserve the breathability of the walls, prevent cracks |
| Micro-sanding | Cleaning without altering the surface of the stone |
| Mineral water-repellent treatment | Protect the façade while maintaining its natural appearance |
| Patina or mineral veil | Uniform the shades while keeping the apparent reliefs |
Why choose Avenir Rénovations Belgium?
- Specialists in the renovation of old and heritage façades
- Use of techniques and materials compatible with millstone
- Compliance with local architectural and urban planning regulations
- Meticulous work, high-end finishes
- Warranty on joints, treatment durability, and project longevity
Request your free quote for the renovation of a millstone wall
Do you want to preserve the charm of your millstone façade, while ensuring its long-lasting protection against moisture, frost, and aging?
Contact Avenir Rénovations Belgium for a renovation done according to the rules of the art, in line with the original style and technical requirements.
Contact us today to arrange a free home visit and receive your detailed, no-obligation quote.
Frequently Asked Questions – Renovation of Millstone Walls in Belgium
Can all millstone facades be renovated?
Yes, provided that the support is structurally sound. Even heavily soiled facades or those with severely deteriorated joints can be restored if the intervention is carried out with the right materials (notably lime) and gentle techniques. A prior technical visit is essential to assess feasibility.
Do damaged stones need to be replaced?
Not necessarily. In most cases, the millstone can be consolidated and cleaned, then enhanced with a lime repointing. Complete replacement of a stone is only considered if it is cracked, shattered, or detached from the wall.
Why should cement not be used for joints?
Cement is too rigid and impermeable. It prevents the stone from breathing, which promotes cracks and rising damp. That is why we exclusively use natural lime-based mortars (NHL), which ensure the flexibility and permeability necessary for millstone.
Can paint or a coating be applied to a millstone wall?
This is strongly discouraged. Covering a millstone wall with paint or a coating amounts to masking the original material, which is often prohibited by urban planning regulations. Moreover, it harms the natural breathing of the wall and can lead to damage.
Does the renovation of a millstone wall entitle one to aid?
In some cases, yes. If your property is located in a protected area, a classified zone, or subject to specific urban planning regulations, aid for the renovation of built heritage may be granted by the region, municipality, or province. We can assist you in these procedures.
