How do you make a bidding process legally secure when selling a house without an real estate agent?

The private bidding process

A bidding process in Switzerland is not legally an auction within the meaning of the law, but an invitation to submit offers. Since real estate contracts require public notarization in accordance with Art. 216 OR, a maximum bid submitted is not legally binding for either party. Legal certainty is ensured by the seller explicitly states in the tender text: “The sale is made to the highest bidder subject to acceptance by the seller and notarial certification. ”

The distinction: bidding process vs. auction

It is a common misconception in 2026 that the highest bidder automatically has a claim on the house. As a seller, you retain full control in the private bidding process.

In Switzerland, public auction (auction) is subject to strict cantonal rules. A private bidding process, on the other hand, is just a structured sales model. They invite interested parties to submit an offer within a period of time. You are not required to sell to the highest bidder. You could also opt for the second-highest bid if you like the buyer more or they guarantee faster processing. However, this freedom must be clearly communicated in the tender text in order to avoid allegations of good faith (unfair conduct).

The preparation: The watertight dossier

Before you accept the first bid, your documentation must be complete. In 2026, transparency about the energy status is the be-all and end-all.

A bidder will only place a high and serious bid if he knows exactly what he is bidding on. Make sure that all relevant documents, such as the current land register extract, the building insurance certificate and in particular a current GEAK report (building energy certificate), are available digitally. Nothing is more legally dangerous than when a bidder withdraws his offer after the inspection because he learns of a restructuring backlog that was not mentioned in the dossier. A “roof in need of renovation,” as we discussed in the previous guide, must be clearly declared so that the bidder base is calculated on stable facts.

The call for proposals: Set clear rules

The success of the proceedings depends on the accompanying letter accompanying the exposé. Here you define the rules of the game that everyone must abide by.

In this document, you should clearly state the following points:

• minimum price: Enter a starting price below which bids will not be considered.
• number of rounds: Clarify whether there is only one bidding round or whether there is an “improvement” after the first round (two-stage process).
• Financing confirmation: Require that every bid be submitted together with an irrevocable financing commitment from a Swiss bank. In 2026, professional sellers will no longer accept bids “on good luck.”
• Non-binding clause: Repeat the note that only the notary contract creates the binding.

The reservation agreement: The critical intermediate step

Once you have decided on a bidder, the reservation agreement usually follows. This is where the biggest legal pitfalls lurk for private sellers.

A reservation payment (e.g. 20,000 CHF to 50,000 CHF) is often required. Please note, however: Since the reservation agreement also represents a preliminary contract for the purchase of land, it would actually also have to be publicly notarized in order to be fully binding. In practice in 2026, these contracts are usually drawn up in private writing.

Should the buyer still drop out, you can't simply keep the down payment as a lump sum of “repentance.” You may only calculate your actual expenses (advertisement costs, notary draft, preparation costs). The rest must be paid back. Anyone who is too greedy as a seller here will quickly end up in front of the justice of the peace.

Dealing with transparency and discrimination

A bidding process without a real estate agent means that you communicate directly with people. In 2026, the social component of real estate sales is more important than ever.

In order to be legally secure, you should treat all bidders equally. If you give a bidder additional information (e.g. about the neighborhood or future construction projects), you should make this information available to all bidders in the process. An unfair information advantage for individuals can discredit the entire process. Document receipt of bids with a time stamp so that, in case of doubt, you have met the deadlines.

The crowning finale: going to the notary's office

Once the selection is made and funding is secured, you shouldn't waste any time. The “risk zone” lies between the end of the bidding process and the notary appointment.

Since the bids are not binding under Swiss law, buyers can skip the notary until the last second before signing (or try to lower the price after all). As a private seller without an real estate agent, you must remain calm here. Have the notary draw up the draft sales contract as quickly as possible and set a timely date for notarization. Only with public certification is the bidding process legally completed and the price fixed.

Conclusion: structure is the best protection

How do you make a bidding process legally secure? Through maximum transparency and constant reference to the legal non-binding nature up to the notary appointment. A private bidding process in 2026 is a highly efficient tool for realising the market value of a property, but requires the discipline of a professional from you as a seller.

In summary, it can be stated that anyone who clearly defines the rules of the game, only accepts bids with bank confirmation and makes the reservation agreement fair minimizes their legal risk. The bidding process is not a lawless area, but a process flanked by the Code of Obligations. Anyone who carries out this process with the necessary care not only saves the brokerage commission, but also sleeps peacefully after the sale, because all parties involved have been treated fairly and in a legally secure manner.

glossary

• Public certification: The necessary form for the validity of a real estate purchase in Switzerland (Art. 216 OR).
• GEAK (building energy certificate): A document that is the basis for every property valuation in 2026.
• reservation agreement: A preliminary contract that states the intention to buy but is only binding to a limited extent without a notary.
• Financing confirmation: The document from a bank that guarantees the seller that the buyer has the necessary funds.
• Good faith: The legal principle of fair conduct in business transactions (Art. 2 ZGB).