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House Extension in Western Switzerland — Free Quote

Extension et agrandissement de maisons en Suisse romande : surélévation, annexe, véranda.

Indicative price: 40000–150000 CHF/fixed price · Free quote within 24h

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How house extension works proceed in Switzerland

A new build project starts with a pre-design phase: feasibility study, analysis of the zoning plan, consultation of the municipal building regulations. The architect or project manager prepares the execution drawings, the planning permission application and the specification documents for the contractors. After the permit is granted (average period: 2 to 6 months), the site begins with excavation and foundations. The structure then rises in successive packages. For a 150 m² detached house, allow 10 to 18 months on site. The final handover is carried out by the project manager and architect, with a documented snagging list.

Regulations and standards in Switzerland

All new construction in Switzerland is subject to the full SIA normative framework (standards 118, 260, 261, 262 etc.), cantonal and municipal building regulations, and the MoPEC energy requirements. The Minergie label (standard, P or A) is strongly recommended and often subsidised. For buildings over 1,000 m² GFA, a life cycle assessment (LCA) is required in several cantons. The use of an architect or engineer registered with the cantonal professional register (REG) is mandatory for constructions exceeding certain thresholds. Decennial liability insurance (extended professional liability) must be taken out by all companies involved.

Budget and tax deductions

The average cost of new construction in French-speaking Switzerland ranges from CHF 3,000 to CHF 5,500/m² SIA 416 depending on the region, finishes and technical equipment. Investments in high energy standards (Minergie-P, Minergie-A) are partially subsidised by the Buildings Programme and cantonal energy services. Mortgage interest and indirect amortisation (pillar 3a) are tax-deductible. During the construction phase, construction interest is also deductible. Engage an accountant from the planning phase to optimise project financing and tax structure, especially if building for investment rental.

House Extension prices in French-speaking Switzerland — Indicative rates 2026

Price ranges based on the Swiss market

Service Min. price Max. price Unit
House Extension — Canton of Vaud (VD) 44 800 CHF 168 000 CHF fixed price
House Extension — Canton of Genève (GE) 47 200 CHF 177 000 CHF fixed price
House Extension — Canton of Valais (VS) 40 000 CHF 150 000 CHF fixed price
House Extension — Canton of Fribourg (FR) 38 000 CHF 142 500 CHF fixed price
House Extension — Canton of Neuchâtel (NE) 40 000 CHF 150 000 CHF fixed price
House Extension — Canton of Jura (JU) 36 000 CHF 135 000 CHF fixed price
House Extension — Canton of Berne (Jura bernois) (BE) 42 000 CHF 157 500 CHF fixed price

Indicative price — the final rate depends on the complexity of the project.

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House Extension — Top 10 cities in Western Switzerland

Find specialist house extension professionals in the main French-speaking Swiss cities. Free quote, fast response.

1
House Extension in Genève GE
2
House Extension in Lausanne VD
3
House Extension in Bienne BE
4
House Extension in Neuchâtel NE
5
House Extension in La Chaux-de-Fonds NE
6
House Extension in Fribourg FR
7
House Extension in Vernier GE
8
House Extension in Sion VS
9
House Extension in Lancy GE
10
House Extension in Yverdon-les-Bains VD

House Extension in the main cities

House Extension in GenèveHouse Extension in LausanneHouse Extension in BienneHouse Extension in NeuchâtelHouse Extension in La Chaux-de-FondsHouse Extension in FribourgHouse Extension in VernierHouse Extension in SionHouse Extension in LancyHouse Extension in Yverdon-les-BainsHouse Extension in MontreuxHouse Extension in MeyrinHouse Extension in BulleHouse Extension in NyonHouse Extension in CarougeHouse Extension in RenensHouse Extension in VeveyHouse Extension in OnexHouse Extension in MontheyHouse Extension in PullyHouse Extension in MartignyHouse Extension in SierreHouse Extension in MorgesHouse Extension in ThônexHouse Extension in Val-de-RuzHouse Extension in ÉcublensHouse Extension in Villars-sur-GlâneHouse Extension in GlandHouse Extension in VersoixHouse Extension in Brig-Glis

Related services

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Frequently asked questions — House Extension

How much does house extension cost in French-speaking Switzerland?
Indicative prices range from 40000 to 150000 CHF/fixed price depending on the canton and complexity of the project. Geneva and Lausanne tend to be 10–18% above average due to higher living costs. Always request a written quote for your specific project.
How do I find a reliable house extension professional?
Look for tradespeople with a Swiss federal certificate of competency (CFC) or federal diploma, up-to-date professional liability insurance and verified client reviews. SOS-Travaux.ch pre-vets all partner tradespeople before listing them on the platform.
How long does house extension typically take?
Duration varies significantly depending on the scope of work. Minor repairs may take a few hours; a full renovation can span several weeks. The tradesperson will provide an estimated timeline in the written quote after assessing your specific project on site.
Are there Swiss government subsidies available?
Yes — the federal and cantonal Buildings Programme offers subsidies for energy efficiency improvements (insulation, heating system replacement with renewables, solar panels). Some cantons and municipalities offer additional incentives. Ask your tradesperson about eligibility before signing the quote.
What warranty applies to the work?
Swiss law (Code of Obligations art. 371) provides a 5-year warranty for construction defects and a 2-year warranty for apparent defects. Ensure this is explicitly mentioned in the contract or accepted quote. Manufacturer warranties on materials and equipment are additional to the legal warranty.

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