Buying or selling with several owners: how to document decisions

Buying or selling with several owners: why consent must be in writing

When a home belongs to several people, the practical issue is not usually just whether it can be sold, but how to show that everyone has accepted the transaction or, at the very least, that the decision has been taken with the necessary backing. This is especially important when the property is held in co-ownership, when there is a joint property arrangement or when the home forms part of a more complex asset situation, such as a matrimonial regime or an undivided inheritance.

In sales with several owners, documentation is not only there to “organise” the signature. It serves to reduce internal conflict, avoid later challenges and make clear to third parties who may act. In practice, it is advisable to separate three aspects: ownership of the property, the power to dispose of it and documentary proof of the decision.

The general guidance is this: if there are several owners, an informal conversation or a verbal agreement between relatives or co-owners is not enough. It is advisable to put the shared intention into a document that identifies the property, the people giving consent and the exact scope of the transaction.

What must be proven before selling

To document the decision properly, the first step is to check what type of ownership exists. A private home with several co-owners is not the same as a property held in joint ownership, a community property situation or an asset subject to an inherited community. Article 396 of the Civil Code reminds us that common elements in horizontal property cannot be split off in isolation and that their transfer or encumbrance is tied to the corresponding private unit art. 396 of the Civil Code.

In addition, where the law requires consent to dispose of assets, article 1322 states that acts carried out without that consent may be voidable if they have not been confirmed, and that gratuitous acts involving joint assets may be void if the other spouse’s consent is lacking art. 1322 of the Civil Code. In relation to joint property, article 1377 requires the consent of both spouses for acts of onerous disposal of joint assets art. 1377 of the Civil Code.

Therefore, before selling, it is advisable to make clear:

1. Who is shown as the owner or owners.

2. Whether each person disposes of a share or whether the property is subject to a regime requiring joint consent.

3. Whether there is any registry, court or family restriction that requires authorisation to be documented in a specific way.

4. Whether any of the owners is acting on behalf of another, and on what basis.

How to record the decision between several owners

The safest approach is a written document signed by everyone involved. It may be a private agreement, an individual authorisation or a public deed, depending on the complexity of the transaction. There is no single valid format for every case, but there is a practical rule: the clearer the proof of the intention to sell, the less room there will be for later doubt.

If the home belongs to several owners in co-ownership, the document should include, at a minimum:

1. Full identification of all the owners.

2. Precise identification of the home or property.

3. An express declaration authorising the sale.

4. Allocation of responsibilities: who negotiates, who signs, who provides documents and who receives notices.

5. An indicative minimum price, if the owners wish to set one.

6. Rules on acceptance of offers, deposits and preliminary expenses.

7. Date, place and signature of all those present.

In homes with several owners for family reasons, it is also useful to state whether the decision is unanimous or whether it is an authorisation granted by majority where legally appropriate. In a practical guide, it is not advisable to assume that a majority is sufficient in every situation: there are cases where the consent of all is required, and others where the law allows the disagreement to be resolved through the courts or by valid representation.

What documents should be prepared to avoid disputes

In a sale with several owners, the best protection is to document not only the agreement, but also the context. There is no need to make the file complicated, but coherent pieces should be gathered.

### 1. Internal sale agreement

Draw up a brief agreement stating that all the owners are aware of the transaction and authorise it. If there are differences, the document should set out exactly what has been approved and what remains pending.

### 2. Power of attorney or express representation

If one of the owners is not going to sign in person, there must be sufficient power of attorney or valid representation. If the signature is delegated, it is not advisable to improvise. The authorisation should identify the property and the scope of the power to sell.

### 3. Minute, agreement or decision conferring authority

Where the decision is conditioned by a family or inheritance situation, a generic document is not enough. The supporting document conferring the power to decide or dispose of the property must be attached.

### 4. Written internal communication

In joint ownership arrangements or between co-owners, it is useful to keep emails, messages or written notes confirming acceptance of the price, the intermediary and the sale strategy. These do not replace a valid signature where the law requires one, but they do help reconstruct the shared intention.

### 5. Ordered record of decisions

If there are several meetings or changes of view, keep a simple chronology. Note what was approved, when, by whom and to what extent. This avoids an initial agreement being confused with a provisional proposal.

Common mistakes when selling with several owners

There are several mistakes that often cause disputes and delays:

- Thinking that a verbal “yes” among relatives is enough to sign later.

- Mixing the intention to sell with the decision on the price, expenses or completion date.

- Signing ambiguous documents without identifying the exact property.

- Forgetting that some elements cannot be separated from the private unit, as happens in horizontal property.

- Assuming that one of the owners can decide for everyone without checking whether they have sufficient authorisation.

- Failing to keep copies of consent or representation documents.

It is also worth avoiding a very common mistake: treating the sale as if it were purely a commercial formality when in fact the disposal capacity of each party must be settled first. If that is not clear, the issue is not the advert or the negotiation; the issue is the standing to sell.

Practical steps to keep the transaction properly documented

1. Gather the title deed, the official registry note and any document that helps identify ownership.

2. Check whether the home is subject to joint ownership, joint property, inheritance or ordinary co-ownership.

3. Determine whether the decision requires everyone’s consent or whether one person is acting through representation.

4. Draft a sale agreement with identification details, powers and scope.

5. If necessary, formalise the required power of attorney or authorisation.

6. Keep a copy signed by all owners and attach it to the sale file.

7. Before accepting a deposit or an offer, check that the consent documentation is complete.

If you are interested in preparing a sale with several owners and would like to organise the paperwork before publishing, you can start an indicative estimate at /valoracion-vivienda-madrid. The online estimate is indicative, does not constitute an official valuation and provides a range with a PDF report; if you need it, you can also request an optional visit.

When it is advisable to seek professional review

In straightforward transactions, a well-drafted written agreement may be enough to organise the internal decision. But if there are undivided inheritances, disagreements between co-owners, a spouse with disputed powers or doubts about whether valid consent exists, it is advisable to review the case individually before committing to the sale.

The general guidance in this article does not replace a specific analysis of the title, the family situation or any documents already signed. If you would like us to review your case and the safest way to document the decision to sell, you can write to us via /contacto. Our office is at Calle Montesa 29, Madrid, with opening hours Monday to Friday from 10:00 to 15:00 and from 16:00 to 19:00.