Short answer. The sale is not automatically void, but the seller cannot pass ownership they never had. Article 1459 requires the vendor to have a right to transfer ownership at the time the thing is delivered, not at signing. A seller who acquires the property before delivering can still perform.

What the law says

The thing must be licit and the vendor must have a right to transfer the ownership thereof at the time it is delivered.

Civil Code, Article 1459 — Licit Object; Right to Transfer. Read the full provision →

The timing clause is the point

Buyers read Article 1459 as saying a seller must own what they sell, and conclude that a sale by a non-owner is a nullity. The article is narrower than that, and more useful. It requires that the vendor have a right to transfer the ownership thereof at the time it is delivered. The reference point is delivery, not the signing of the deed. Contracting to sell something you do not yet own is not automatically void, and developers and traders do it as a matter of course, provided they can acquire the thing and deliver it. The defect crystallises only if delivery arrives and the seller still has nothing to give.

What the buyer gets, and what the buyer does not

Nobody can transfer more right than they hold. Whatever the deed recites, a buyer from a non-owner takes nothing as against the true owner, and the true owner's claim to recover the property is not weakened by the buyer having paid in full and in good faith. What the buyer does hold is everything the contract gives them against the seller: the obligation to deliver, and liability if the buyer is later deprived of the property by someone with a prior right. The practical consequence is uncomfortable. The buyer's real problem is not the land at all; it is whether the seller can still be found and can still pay.

The co-owner who sells the whole property

The commonest version of this is not a stranger selling your land. It is one co-owner selling the entirety of a co-owned property. That sale is not a nullity either. The seller had a right to transfer their own undivided share and nothing beyond it, so the buyer steps into that share and becomes a co-owner alongside the others, which is rarely what the buyer believed they were paying for and rarely what the remaining co-owners expected to discover. Whether the buyer ends up holding the specific portion described in the deed depends on how the co-ownership is eventually partitioned.

What to check before you pay

Get a certified true copy of the title directly from the registry rather than a photocopy handed to you by the seller, and confirm that the registered owner is the person signing, that the technical description matches the property you were shown, and that the annotations on the back are clear. If the registered owner has died, ask how the estate was settled and who the heirs are. If several names appear on the title, ask what the others have signed. Then structure payment so the balance falls due on delivery of a clean transfer rather than before it.

Cases citing this provision

These Supreme Court decisions cite the provision above. We list them so you can read them yourself; the summaries of what each decided are not ours to give.

Related provisions

Note. Statute text quoted on this page is reproduced from the official enactment and is linked to the full provision. The explanation around it is general legal information from Vivas & Nobles Law Office, not legal advice. Whether it applies to your situation depends on facts only a lawyer reviewing them can assess.