Facade renovation in Chambéry.

In Chambéry, nestled between the Bauges and Chartreuse massifs, facades have to withstand a demanding alpine climate. The valley corridor concentrates humidity, run-off, urban pollution and repeated freeze-thaw cycles: render ages quickly here. On the facades of older buildings in the historic Sardinian-era centre as on the houses of neighbouring municipalities, the coating dulls, render blisters, cracks appear and moss and algae take hold on north-facing surfaces.

Facade renovation serves a dual purpose. First, aesthetic: giving your walls a clean, uniform appearance, adding value to the property and preserving the architectural character of the old town. Second, protective: sound render and a water-repellent treatment stop water from penetrating the masonry, preventing leaks, coatings coming away and damage to load-bearing walls. On Sardinian-era buildings and faubourg houses, where old stone and brick are sensitive to moisture, renovating in time avoids far more costly defects.

Facade renovation is not just about comfort: it is often an obligation. The law requires facades to be maintained, and some municipalities can make renovation compulsory by municipal order, usually every ten years. Planning ahead also means avoiding a formal notice. Note: facade renovation is a separate operation from external wall insulation. If your priority is energy performance, see our dedicated page on external wall insulation in Chambéry.

A successful facade renovation always starts with a precise assessment of the facade. Before any quote, we come to inspect the condition of the substrate on site: type of coating (render, roughcast, stone, brick), presence and depth of cracks, damp areas, blistering, detachment, dirt, moss and pollution. This survey determines the cleaning technique chosen and the extent of the repairs required.

Not all facades need the same treatment. A facade that is simply dirty will only need cleaning followed by painting, whereas damaged or cracked render will require partial or complete renewal. The assessment also identifies the source of any defects — a leak, a faulty gutter, rising damp — so that the cause is treated and not just the symptom. We apply this same analytical rigour across all our renovation and construction projects in Chambéry.

On facades in the historic Sardinian-era centre and in the conservation area, the assessment also takes heritage constraints into account: imposed render colours, preservation of architectural mouldings, cornices, string courses and ironwork. We then draw up a detailed quote per m², item by item, clearly separating cleaning, crack treatment, render, painting and scaffolding.

1. Cleaning and hydro-blasting — every facade renovation begins with preparing the substrate. Depending on the facade, we use controlled high-pressure cleaning, hydro-blasting (gentle spraying of a mixture of water and fine mineral powder), ideal for fragile old stone and render, or suitable chemical cleaning. This step removes dirt, moss, algae and old flaking paint, while respecting the heritage fabric of Sardinian-era buildings.

2. Crack treatment — once the facade is clean, we treat the cracks according to their type: opening up, raking out, bridging with reinforcement mesh and filling for micro-cracks, and more structural treatment for active cracks. This step is essential to stop water from getting in again and compromising the new render.

3. New render or roughcast — we then apply a new facade render or roughcast in the chosen finish: scraped, floated, flattened or smooth. The grain and colour are chosen to respect the character of the building and, in the conservation area, the requirements of the Architecte des Bâtiments de France. The render forms a uniform, watertight and durable skin over the masonry.

4. Facade painting — on facades that allow it, a microporous facade paint (siloxane or pliolite) unifies the colour, revives the appearance and provides extra protection. Being microporous, it lets the wall breathe while repelling run-off water.

5. Water-repellent treatment — the final step is to apply a colourless surface water repellent that makes water bead on the facade. This treatment limits moisture absorption, delays re-soiling and the return of moss, and noticeably extends the life of the renovation — a real asset against the humidity of the Chambéry valley.

A quality facade renovation requires safe, properly sized scaffolding that gives the teams full access to the facade. In central Chambéry, where the narrow streets of the old town and adjoining buildings make installation harder, we adapt the scaffolding, handle permits to occupy the public highway and organise the site to minimise disruption for occupants and passers-by. Scaffolding is a cost item in its own right, clearly included in our quote.

On the administrative side, facade renovation that changes the external appearance requires a prior declaration (déclaration préalable) to be filed with the town hall. In Chambéry, the protected conservation area of the old town and the surroundings of listed monuments also require the binding approval of the ABF heritage architect (Architecte des Bâtiments de France): render colours, finishes, and the treatment of architectural mouldings and ironwork are strictly regulated on Sardinian-era facades. We check the local plan (PLU) and the boundaries of the conservation area, and file all the paperwork for you, right through to approval.

EWI option — if, while renovating the facade, you also want to improve the thermal comfort of your home, facade renovation can be combined with external wall insulation. These are nonetheless two technically distinct projects: EWI adds extra insulation beneath a new coating and targets energy performance, whereas facade renovation remains an aesthetic and protective renovation. To find out all about this solution and the associated financial aid, see our dedicated page on external wall insulation and all our services.

The price of facade renovation per m² varies with the condition of the substrate, the cleaning technique, the extent of repairs and the height of the building. As a guide: simple cleaning followed by painting costs around €30 to €60/m²; renovation with new render or roughcast is more likely to cost €50 to €90/m²; and a badly damaged facade, with extensive crack treatment and careful finishes, goes beyond these ranges. Scaffolding is always added as a separate item.

On the facades of older buildings in central Chambéry, several factors affect the costing: preservation of mouldings and string courses, imposed render colours in the conservation area, access via narrow streets or the height of Sardinian-era buildings. For jointly owned buildings, the cost is shared between the co-owners according to their ownership shares, after a vote at the general meeting.

Rather than quoting a price at random, we prefer to draw up a free, detailed quote after a visit, in which each item — cleaning, crack treatment, render, painting, water repellent, scaffolding — is shown clearly per m². This transparency lets you compare with confidence and understand exactly what you are paying for.