Renovating a Valais chalet without betraying the mountain
In short
An interior designer Valais plans and runs the fit-out of chalets, mayens and resort apartments, from diagnosis through site supervision. Fees usually sit around 15 to 22 % of the works for a renovation, or 120 to 300 CHF/h. In Valais there are specific realities on top: vernacular timber, building at altitude, energy upgrades of old stone-and-wood buildings, and the framework of the Lex Weber on second homes.
A mayen in the Val d'Hérens, a 1970s chalet above Verbier, a resort flat in Crans-Montana: three properties, three very different building sites. What they share is that you do not treat them like a flat down in the valley. The wood moves, altitude sets its own rules, and the legal framework for second homes decides what you can extend or rebuild. Before you pick a tile, you have to read the building and read the commune.
What an interior designer Valais actually does
The interior architect designs the layout of spaces, the light, the materials, the built-in furniture and the finishes. It is not just decorating: they rethink non-load-bearing walls, circulation, storage and services (electrical, heating, plumbing) alongside the engineer and architect whenever the structure or the envelope is touched.
In Valais, a large share of the work is renovation. You work with what is there: exposed beams, larch floors, dry-stone walls, low ceilings, narrow openings built to keep out the cold rather than to capture the view. The designer's job is to use these constraints without stripping the building of its character.
The phases of a project, from diagnosis to site
A serious project follows a clear sequence. Skipping a step almost always means paying more later.
Condition of the timber, damp, load-bearing structure, services. On a building from before 1991, an asbestos survey is essential before any demolition.
Defining needs, ranking priorities, a realistic financial envelope and a reserve for the unexpected.
Plans, sections, moods, material choices. The big options are signed off before going into detail.
Technical dossier and, where needed, a building application via the cantonal eConstruction platform.
Consulting local firms, comparing quotes, choosing the trades.
Coordinating trades, quality control, handling surprises and final handover.
What it costs: fees and works budget
An interior architect's fees are usually calculated as a percentage of the works, or by the hour. For a renovation, expect roughly 15 to 22 % of the works amount; for new build, more like 12 to 18 %. The hourly rate generally falls between 120 and 300 CHF. The SIA scale serves as a benchmark but has not been binding since 2020: everything is negotiated and fixed in a written contract.
Rough order of works cost for a renovation
These ranges are indicative and vary with site access, altitude and the state of the building. Plan a reserve of 10 to 20 % of the budget: with old buildings, surprises (damp, structure, ageing services) are the rule, not the exception. Overruns are often between 15 and 25 % when the initial diagnosis was rushed.
Old chalet or resort apartment: two building sites
Valais covers very different realities depending on whether you are renovating an isolated mayen or a flat in a resort residence. The technical, regulatory and budget questions only partly overlap.
- Timber and stone structure to diagnose first
- Insulation and airtightness to redo without suffocating the wood
- Often outside the building zone: dossier reviewed at cantonal level
- Vernacular character to preserve (communal rules on roofs and facades)
- Site access sometimes difficult, logistical extra cost
- Work mainly on non-load-bearing walls and finishes
- Condominium rules and shared areas to respect
- Often second-home status (Lex Weber)
- Acoustic requirements between dwellings
- Shorter site but limited windows to work outside the season
Unsure whether your Valais renovation is feasible? A first diagnosis saves months of mistakes. Let's talk about your building before the drawings. Compare architects in your canton
Wood, altitude and energy: the Valais realities
Wood is the canton's material, but it is a living one: it swells, shrinks and copes badly with poorly designed insulation that traps water vapour. On an old chalet, the energy upgrade depends as much on how well the walls breathe as on the thickness of insulation. You favour systems that let the stone-and-wood wall release moisture, otherwise you risk invisible rot.
Altitude has a cost. Between 800 and 1'500 metres, freeze-thaw cycles, snow loads that can reach the order of 600 kg/m² and site access push up construction costs: an extra 12 to 18 % over the valley is commonly cited. These constraints feed into schedules, foundations and material choices.
In the mountains you don't renovate against the building, you renovate with it. Diagnosing the wood and the damp comes before choosing materials.
Second homes and the Lex Weber: what to know
Valais is the canton with the highest share of second homes in Switzerland. The federal law on second homes, known as the Lex Weber, caps the share of second homes in the communes concerned at 20 %. For an interior fit-out that does not touch the living area it has little impact; but as soon as you extend, demolish or rebuild, it becomes decisive.
A revision that came into force on 1 October 2024 relaxed some rules: in communes above the 20 % mark it is now possible, under conditions, to renovate and extend old dwellings built before 2012, with a floor-area gain of up to around 30 % in the case of demolition and reconstruction. The framework stays technical and keeps evolving: always have your specific case checked by the commune and a notary before finalising the project.
When to bring in an interior designer
As soon as a project touches the layout, the services or any permits, hiring a professional pays off quickly. For a simple refresh, a tradesperson is enough; to turn a mayen into comfortable housing or rethink a resort flat, coordinated design prevents costly mistakes and back-and-forth on site.
Look for a professional who is a member of the VSI-ASAI association and trained in a recognised programme (HES-SO, ECAL, HEAD). Ask for references on comparable projects at altitude and on old buildings: renovating in the mountains is not something to improvise.
Your Valais project deserves a local eye
AC Design supports renovations of chalets, mayens and resort apartments, from diagnosis to site supervision. Describe your property and we will tell you what is realistic, and at what budget.
Describe my projectFAQ
Most often 15 to 22 % of the works for a renovation, 12 to 18 % for new build, or 120 to 300 CHF per hour. The SIA scale is only a benchmark and has not been binding since 2020; everything is fixed in a written contract.
No. An interior fit-out that does not change the living area is in principle not affected. The restrictions concern extension, demolition-and-rebuild and the creation of new dwellings. Since 1 October 2024 certain renovations and extensions of old buildings have been relaxed. Have your case checked by the commune.
It depends on the scale of the works. Interior works with no change to structure or use often need no permit, but as soon as you touch the envelope, the openings or the floor area, an application goes through the eConstruction platform. Outside the building zone, the cantonal authority handles it.
Freeze-thaw cycles, snow loads that can reach the order of 600 kg/m², site access and reinforced foundations commonly add 12 to 18 % over the valley, not counting the logistics of isolated sites.
Yes for any building constructed before 1991. An asbestos survey must precede any demolition or heavy intervention. On old chalets you also check the timber, the damp and the services before locking in the budget.