Around 15–20% of all residential properties in Switzerland are sold via a bidding process (Bieterverfahren) — and the trend is rising, especially in Zurich, Geneva and Basel. About 66% of processes end in a sale, with the winning bid typically 15–20% above the guide price (Richtpreis). From start to notary takes roughly 14 weeks. The process is not regulated by statute; the general provisions of the Swiss Code of Obligations (OR) and the Civil Code (ZGB) apply. A bid only becomes binding once the purchase contract is notarised (Art. 216 OR).
In sought-after Zurich locations, winning bids are often 10–20% above the guide price (Richtpreis); the final price is frequently 5–20% above market value. Many agents deliberately set the Richtpreis 10–20% below the actual market value (anchoring effect) to attract as many bidders as possible and maximise competition. On average, bidders pay 5–15% more than in a fixed-price sale. For this reason, bid on the basis of your own valuation, not on the basis of the guide price.
The open and the digital process (with a timer) tend to create the highest competitive and emotional pressure and push the price up the most. Sealed-bid processes often lead to a more favourable result, because there is no mutual escalation — each party submits a single, sealed bid. The multi-round process lies in between: the price rises step by step, but in a more controlled way.
Banks finance only up to 80% of their own valuation — the difference to your bid is equity. With a bank valuation of CHF 1 million, you need CHF 200'000 (20%) against the appraised value. If the purchase price is 20% higher, the equity requirement rises to CHF 400'000 (33%); at 25% higher, to CHF 450'000 (36%). In addition, the bank calculates affordability using an imputed interest rate of 5%; housing costs must not exceed 33% of gross income. Important: affordability is based on the purchase price, not on the bank valuation.
No. A Bieterverfahren is not an auction within the meaning of Art. 229 OR, and the seller is not obliged to accept the highest bid. The bid remains legally non-binding as long as no purchase contract has been notarised — only the public notarisation under Art. 216 OR creates a binding obligation. Be cautious with reservation agreements (Reservationsvertrag): they can stipulate high contractual penalties (Konventionalstrafe) and should be reviewed by a lawyer before signing.
For people without Swiss citizenship or a C residence permit, the restrictions of the Lex Koller (BewG) additionally apply. Bidding processes are increasingly appearing on the rental market in Zurich, Geneva and Basel as well — in a legal grey area. The initial rent can be challenged within 30 days of move-in before the conciliation authority (Schlichtungsbehörde) if it is abusive (Art. 270 OR). Digital bidding processes currently account for only about 5% of all processes.