Switzerland’s real estate market is among the most stable and tightly regulated in the world. For international buyers, that stability comes with a legal framework that is often misread — misread by those who assume they cannot buy here at all, and equally by those who assume there are no meaningful restrictions.
The central piece of legislation is the Federal Act on the Acquisition of Real Estate by Persons Abroad, universally known as the Lex Koller. Understanding it precisely — not approximately — is the right starting point for any cross-border purchase.
What the law does
The Lex Koller, in force in various forms since the 1960s and substantially revised in 1983, restricts the acquisition of residential property by persons and entities domiciled abroad. Its purpose is specific: to prevent disproportionate foreign ownership of Swiss residential real estate and to protect housing availability for residents.
The law is not a blanket prohibition on foreign ownership. It is a permission framework — and the decisive variable is not nationality but residence status.
The residence permit framework
Switzerland’s permit system defines the practical categories that determine whether the Lex Koller applies at all.
C permit holders (Niederlassungsbewilligung) are treated on the same terms as Swiss citizens for property acquisition. A C permit — generally available after five or ten years of legal residence, depending on bilateral agreements and nationality — removes Lex Koller restrictions entirely. C permit holders may purchase residential property anywhere in Switzerland without authorization.
B permit holders from EU and EFTA countries may acquire a primary residence — the property they intend to live in — in the commune where they are registered, without authorization. The position for secondary residences is more nuanced and subject to cantonal rules.
B permit holders from non-EU/EFTA countries may generally purchase a primary residence at their place of registration without authorization. Any secondary or holiday property, however, requires a formal cantonal authorization.
G permit holders (cross-border commuters) may acquire a primary residence within their designated commuting zone. Specific conditions vary by canton.
Non-residents — those without a Swiss residence permit — face the full authorization process. Acquisitions require cantonal approval, subject to annual quotas set by the federal government. Quota allocation, processing requirements and timelines differ across cantons.
Commercial property: outside the scope
One important carve-out: commercial and industrial property acquired for genuine business purposes is not subject to the Lex Koller. Office premises, retail space and industrial facilities fall outside the law entirely. This distinction can be relevant for business owners relocating to Switzerland who are also acquiring commercial premises.
The Lex Weber layer
The Lex Koller is not the only relevant restriction on residential real estate. The Second Home Initiative — known as the Lex Weber — was approved by Swiss voters in 2012 and added a separate constraint: in municipalities where secondary residences already make up more than 20 percent of the total housing stock, no new secondary residences may be built. Existing secondary residences can still be transferred, but new construction is blocked.
This affects primarily Alpine resort areas and some rural lakeside communities. In urbanised lakeside commuter zones — the communities along Lake Zurich, for example — most municipalities are well below the 20 percent threshold and are therefore unaffected.
Authorization in practice
Where authorization is required, the process runs through the cantonal authority — typically the land registry office or the competent building administration. The applicant must demonstrate eligibility under one of the recognised grounds: the applicable cantonal quota allocation for secondary residences, authorization for holiday property, and so on. Processing timelines vary by canton and workload.
The finite nature of annual quotas matters for buyers who need them. Where a canton’s quota for a given year is exhausted, authorization cannot be obtained until the following year’s allocation. This is not an abstract risk for popular destinations.
What this means for buyers in the Zurich region
For the international professionals who form the majority of buyers in the Lake Zurich area, the Lex Koller is less of an obstacle than is often assumed. A buyer arriving with an EU or EFTA B permit who purchases the property they will live in does not require authorization.
Complexity arises in specific situations: buyers from non-EU/EFTA countries who have not yet obtained a C permit; any buyer seeking a secondary or holiday property regardless of nationality; and buyers purchasing through structures — companies, trusts, funds — where the underlying beneficiaries include foreign-domiciled persons.
What good preparation looks like
The Lex Koller question belongs at the beginning of the process, not the middle. An advisor who establishes permit status, intended use, and authorization requirements before the property search begins saves clients from avoidable delays, aborted offers, and competitive disadvantage.
Where authorization is required, it affects not just feasibility but negotiation strategy. A seller with multiple interested parties will not hold for an authorization timeline that could run to several months. Understanding this in advance — and structuring the approach accordingly — is part of what an experienced buyer’s advisor does.
At Mehta Trenkler Real Estate, these questions are raised at the outset of every buyer mandate and, where legal advice is needed, clarified with a specialised lawyer, so that clients can move with confidence when the right property appears.