Swiss federal law restricting non-Swiss citizens and foreign-owned companies from purchasing residential and agricultural property, requiring cantonal authorization.
Lex Koller, officially known as the Federal Statute on the Acquisition of Real Property by Persons Abroad (Bundesgesetz über den Erwerb von Grundstücken durch Personen im Ausland), is a cornerstone of Swiss property law governing non-Swiss ownership of real estate. Enacted in 1983 and amended several times, Lex Koller restricts foreign acquisition of Swiss residential and agricultural property to preserve Swiss sovereignty over its land and property market. The statute applies to all persons and entities whose primary residence or seat is outside Switzerland. Foreign purchasers (including foreigners with residence in Switzerland but not Swiss citizenship) must obtain cantonal authorization before acquiring residential or agricultural property. Commercial and business property generally face fewer restrictions.
Lex Koller defines "foreigners" broadly as non-Swiss citizens and foreign-owned entities (companies, partnerships, trusts) regardless of their residence status. A Swiss resident with a foreign passport still qualifies as a "foreigner" under Lex Koller and must comply with authorization requirements for residential purchases. Conversely, some non-Swiss EU/EEA nationals with permanent Swiss residence (C permits) have reduced restrictions or exemptions in certain cantons. The rules vary significantly by canton—some maintain strict limits on foreign ownership, while others are relatively liberal for EU citizens. Cantonal authorities administer and grant authorizations through their migration or justice offices.
The authorization process requires demonstrating a legitimate interest in acquiring the property. Criteria typically include: main residential residence requirements (the foreigner claims the property as their primary Swiss home), family ties to Switzerland, professional necessity, or other compelling interests recognized by cantonal authorities. Investors purchasing for speculative purposes or investment income typically do not qualify. The applicant must submit proof of identity, proof of funds, rental agreements or construction contracts, and an explanation of the intended use. Cantonal authorities conduct due diligence including security checks and may request additional documentation.
Processing times for Lex Koller authorization vary significantly by canton, ranging from 4–12 weeks or longer. Some cantons process applications quickly; others maintain backlogs and slower procedures. Authorization decisions are discretionary—even meeting the criteria does not guarantee approval. Denied applicants have limited recourse; appeals are possible but restrictive. The requirement for pre-authorization before purchase creates complications for foreign buyers; many make conditional offers pending authorization approval. Refusal to authorize a purchase can occur after substantial negotiation or emotional commitment, causing significant disruption to buyers' plans.
For international property investors, Lex Koller presents substantial barriers to Swiss real estate investment. Foreign investors typically cannot purchase residential properties at all. Commercial property faces fewer restrictions and is often available to foreign investors without authorization. Some investors structure purchases through Swiss-registered companies to circumvent restrictions, but such transactions are scrutinized and may fail Lex Koller requirements. Real estate professionals often recommend that foreign investors focus on commercial property or partner with Swiss citizens to hold residential property titles. The complexity and uncertainty surrounding Lex Koller make Swiss residential property acquisition challenging for non-citizens.
Commercial and business property generally face fewer Lex Koller restrictions. Authorization may not be required for office buildings, retail spaces, or business properties purchased for professional use. However, restrictions vary by canton and by property type. Some cantons restrict agricultural land more strictly than residential property. Always consult a Swiss lawyer to determine whether your specific property requires authorization.
EU/EEA citizens do not have automatic exemptions from Lex Koller, but bilateral agreements between Switzerland and the EU provide some advantages. EU citizens with Swiss permanent residence (C permits) may face reduced restrictions or exemptions in some cantons. Processing may be faster for EU citizens in certain cantons due to favorable bilateral relations. Consult with your cantonal authorities about EU-specific provisions in your canton.
Denied applicants can appeal the decision, but appeal procedures are restrictive and success rates are low. If denied, you cannot proceed with the purchase. You may attempt to reapply in a different canton or consider commercial property alternatives. If you've already signed a purchase agreement, a denial leaves you in breach of contract (unless you obtained a conditional authorization clause). This is why pre-authorization before making an offer is essential.
→ Read our full guide: Foreign Property Ownership Switzerland
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