Facade insulation — Valais
Contribution per m² depending on requirements met.
Valais support for envelope insulation via the Buildings Programme.
www.leprogrammebatiments.chRoof renovation · Monthey

At a glance
Small project
CHF 16'400 – CHF 37'600
Typical project
CHF 29'700 – CHF 65'400
Large project
CHF 49'600 – CHF 107'200
| Project | Quantity | Low | High | Per unit |
|---|---|---|---|---|
| Small project | 70 m² | CHF 16'400 | CHF 37'600 | CHF 400 |
| Typical project | 140 m² | CHF 29'700 | CHF 65'400 | CHF 300 |
| Large project | 245 m² | CHF 49'600 | CHF 107'200 | CHF 300 |
Computed with our estimator for Monthey (regional factor included), standard finish. Only the project size changes.
Included
Not included
In Monthey, the federal building register lists 2'723 residential buildings and 9'846 dwellings. These municipal benchmarks help put your home in context, but do not replace an individual assessment.
51 % built before 1980
Construction year does not reveal past renovations: check the current insulation condition.
26 % · Gas
This distribution describes recorded buildings, not your system's consumption or efficiency.
| Energy | Heating | Hot water |
|---|---|---|
| Gas | 26 % | 24.8 % |
| Heating oil | 24 % | 23.4 % |
| District heating | 6 % | 4.9 % |
| Heat pump | 10 % | 8.8 % |
| Electricity | 25 % | 33.1 % |
| Wood | 9 % | 3 % |
Each line gives the share of buildings using that energy, separately for heating and for hot water. The two columns do not always reach 100%: some buildings combine two systems, or reported none.
A standard non-condensing boiler is usually older and less efficient.
6.3 % of buildings mix housing with shops or offices.
For your renovation projects in Monthey, reviewing the federal building register is a vital first step. Among 2659 buildings, the heritage status is known for 108, with 2 currently protected, necessitating early contact with local authorities regarding permits. Regarding building scale, we have volume data for 111 houses following the SIA 416 standard, showing a median of 725 m3, which is essential for estimating heating or insulation costs. Please note that data coverage is partial, as no renovation year figures are available. Utilizing these official figures helps homeowners plan their renovations effectively within the municipality.
Source : Registre fédéral des bâtiments et des logements (RegBL), OFS, 2026. Existing residential buildings; percentages of recorded values.
7 °C and about 64 frost days per year. These conditions require a roof in perfect condition, capable of withstanding snow loads and frequent freeze-thaw cycles.
Damaged insulation or porous roofing leads to significant heat loss, unnecessarily increasing your energy bill given the heating needs estimated at 2711 Kj/year.
Anticipating work is essential to avoid water infiltration that could permanently damage your roof structure.
If you notice broken tiles, moisture traces in your attic, or an unexplained increase in your heating consumption, it is time to consult a professional.
A well-renovated roof not only protects your building from local weather conditions, but it also aligns with the vision of Monthey, a Gold Energy City, aimed at improving the energy efficiency of private buildings.
The choice of materials is crucial in Monthey due to snow loads and frost. A high-performance roof combines strict sealing, reinforced insulation, and suitable covering.
Roof insulation, carried out at the same time as the roofing, is highly recommended to optimize thermal performance and may be eligible for the Buildings Program.
It is essential to choose materials with proven durability under local conditions, taking into account exposure.
Furthermore, the integration of renewable energy is a major lever. With a global irradiation of 1385 kWh/m²/year, your roof has significant solar potential.
If you plan to install photovoltaic panels, their removal and reinstallation must be budgeted from the start in your renovation project.
Opting for high-performance systems helps meet the objectives of Monthey's energy master plan, which actively encourages the production of local renewable electricity while improving the efficiency of existing installations.
The housing stock in Monthey has varied characteristics that require prior analysis.
If your house dates from before 1990, particular vigilance is required regarding the possible presence of hazardous materials such as asbestos, often hidden in old insulation or certain roof coverings.
A technical assessment before work begins allows for the identification of these risks and the organization of necessary abatement procedures according to current standards, thus ensuring site safety.
Older buildings often suffer from insufficient insulation compared to current standards required to meet the city's energy goals.
Roof renovation is the ideal opportunity to bring insulation and utility networks, which often run through the attic, up to standard.
By examining the state of the roof structure, a professional can determine if reinforcements are needed to support new roofing materials or solar installations.
This assessment allows you to structure your project coherently, avoiding technical surprises that could unnecessarily weigh down your renovation budget.
It is advisable to contact the urban planning or public works department of the municipality of Monthey directly to check if your building is located in a protected sector or if it is subject to special architectural rules that could influence the choice of your materials, particularly for tiles or the integration of solar panels.
A permit is generally required for any significant change to the exterior appearance of your building, such as installing roof windows or changing the type of roofing.
Do not neglect this step, as compliance with municipal regulations is essential for the validation of your work.
Ask local authorities about the procedures in force before signing any quote with a company to ensure that your project complies with the city's urban planning requirements.
It is crucial to note that the order of steps is mandatory : you must submit your aid application before starting the work. An application submitted after the start of the site is systematically refused.
These contributions are paid per m² according to the energy requirements achieved after renovation.
To know the exact conditions and amounts available for your type of project, consult the official website of the Buildings Program.
In addition to direct aid, remember that energy renovation work can have advantageous tax consequences, as they often allow you to reduce your taxable income by deducting maintenance and energy improvement costs.
Contact a tax advisor or the competent authorities to validate the eligibility of your project and the correct procedure for your tax deductions.
The schedule of a roof renovation in Monthey depends greatly on weather conditions, especially due to the 64 annual frost days.7 °C, are limited. This guarantees a quick and secure weather-tightness of your building throughout the work.
The typical process begins with a preparation phase including scaffolding assembly and protection setup. Then comes the removal of old tiles, followed by the inspection of the roof structure to detect potential damage.
If necessary, reinforcement work or wood treatment is carried out. This is followed by the installation of insulation, a key element of the Buildings Program, followed by the underlayment and the new roof covering.
Each step requires precise coordination to avoid any exposure of your home to bad weather. A rigorous schedule, established with your roofer, is essential to ensure the success of your renovation project.
The most common error is to start work without having previously checked the requirements of the Buildings Program, which makes your project ineligible for financial aid. Ensure you have obtained all administrative validations before signing a quote.
Another common error is to ignore the removal and reinstallation of solar panels in the budget, which often leads to unforeseen cost overruns.
Finally, neglecting the state of the roof structure before installing a new covering can lead to costly structural problems in the long term.
Here is your checklist before contacting companies : check the age of your roof and signs of wear, determine if you wish to insulate simultaneously to benefit from aid, list your needs in terms of energy efficiency and solar production, contact the municipality to know the architectural constraints, demand detailed quotes specifying waste management, safety, and solar integration, ensure that the professionals are certified and have experience with local snow load constraints, and confirm that the schedule respects climate seasonality to avoid frost periods.
1. Estimate
Set a budget range with the estimator.
2. Grants
Apply before work starts.
3. Quotes
Compare at least 3 quotes.
4. Permit
Check with the municipality whether a permit is needed.
5. Works
Follow the site and do a written handover.
Contribution per m² depending on requirements met.
Valais support for envelope insulation via the Buildings Programme.
www.leprogrammebatiments.chCheck amounts and conditions with the provider before signing: apply before work starts in most cases.
1870 Monthey · about 0 km
Company based in Collombey specializing in waterproofing, thermal insulation, and roof maintenance services across French-speaking Switzerland.
visaretfilsetancheite.ch1870 Monthey · about 0 km
Specialist in civil defense shelters, cellar carpentry, and drone maintenance for facades, roofs, and solar panels.
abriprotect.ch1870 Monthey · about 0 km
Specialist in waterproofing, insulation, resin, and roof safety based in Monthey, serving Valais and the Chablais region.
jks-tech.ch1870 Monthey · about 0 km
Valais-based company specializing in plumbing, roofing, tinsmithing, and heating systems including solar thermal and heat pumps.
parchet.chSuggestions from the commercial register by distance and activity. Not an endorsement or partnership.
You can benefit from support via the Buildings Program for envelope insulation, including the roof. It is imperative to submit your application before work begins.
Yes, in Monthey, materials must be chosen for their resistance to snow loads and frost. Your roofer will validate the structure to support these stresses.
Yes, a permit is generally required to modify the exterior appearance. Check with the urban planning department before signing any quote.
The removal and reinstallation of panels during renovation must be budgeted. Your roof benefits from good solar potential in Monthey.
Prefer the summer or early autumn. This avoids the risks associated with the 64 annual frost days in Monthey.
Vigilance regarding asbestos is necessary. Have a technical assessment carried out to identify hazardous materials before starting work.
Costs related to energy renovation and maintenance work are often deductible. Consult a tax advisor to validate your situation.
Altitude
407 m
Heating degree days
2'711 Kj/an
20/12 °C
Frost days
64 jours/an
Solar irradiation
1'385 kWh/m²/an
horizontal
Winter design temperature
-9.7 °C
1er percentile des minimales
Mean temperature
11.6 °C
Estimated solar yield
1'219 kWh/kWc/an
toit ~30° sud, PR 0.8, estimation
Source : swisstopo – service d'altitude (MNT) · Open-Meteo Historical Weather API (réanalyse ERA5, moyenne 2015-2024)
Source : monthey.ch