Can One Co-Owner Sell Property Without the Others? Philippine Rules Explained

A co-owner can freely sell, assign, or mortgage their own undivided share in a property at any time, without needing permission from the other co-owners — but they cannot validly sell the whole property, or anyone else’s share in it, without the consent of every co-owner who holds a part of it. This comes up constantly with land and houses inherited by siblings, or property bought jointly by unmarried partners or business associates: one co-owner needs cash, signs a Deed of Absolute Sale for the “entire” lot, and a buyer who never checked the title ends up owning far less than they paid for. Article 493 of the Civil Code draws the line exactly where that example breaks down, and the Supreme Court has reaffirmed it as recently as 2022.

Decision Snapshot

• What it is: A question about how much of a co-owned property one co-owner can legally transfer on their own signature — their own share only, or the whole thing.
• Can one co-owner sell alone: Yes, but only their own undivided interest. No co-owner can validly sell the entire property, or another co-owner’s share, without that co-owner’s consent (Civil Code, Art. 493).
• The key qualifying detail: If a co-owner signs a deed purporting to sell the whole property anyway, Philippine courts do not treat the sale as void — they treat it as valid, but limited to the selling co-owner’s own aliquot share.
• The main rule: A buyer in that situation does not get full ownership. They become a new co-owner, holding only the fractional share the seller actually had, alongside the remaining original co-owners.
• An important caveat: Selling your own share is different from altering or leasing out the whole property long-term — that generally needs consent from all co-owners (Art. 491), while ordinary administration needs only a majority (Art. 492).
• Next step: Before buying property from someone, check whether the title or tax declaration lists more than one owner, or is annotated “Heirs of ___” — either signals co-ownership, and you should expect to need every co-owner’s signature.

What the Civil Code Lets a Co-Owner Do Alone

Co-ownership exists whenever two or more people jointly own an undivided property — most commonly siblings who inherited land together, or unmarried partners, relatives, or business associates who bought a property jointly. Article 493 of the Civil Code of the Philippines gives each co-owner “the full ownership of his part and of the fruits and benefits pertaining thereto,” and says a co-owner “may therefore alienate, assign or mortgage it, and even substitute another person in its enjoyment” (Civil Code of the Philippines, Republic Act No. 386, Art. 493, LawPhil). That is a genuinely unilateral right — no notice to, or consent from, the other co-owners is legally required for a co-owner to sell, donate, or mortgage their own undivided interest.

But Article 493 immediately qualifies that right: “the effect of the alienation or the mortgage, with respect to the co-owners, shall be limited to the portion which may be allotted to him in the division upon the termination of the co-ownership.” In other words, a co-owner can only give a buyer what they themselves actually hold — an ideal, undivided share — not a specific room, floor, or physical half of the lot, and certainly not the shares belonging to the other co-owners.

Other acts affecting the whole property follow different rules entirely. Alterations that change the property’s substance or use — new construction, a long-term lease, or demolishing part of the structure — require the consent of all co-owners under Article 491, even if the co-owner proposing the change believes it would benefit everyone. Ordinary acts of administration, like a short-term lease or routine repairs, only need the consent of co-owners representing a majority of the interest in the property, under Article 492. Selling your own share is the one major decision the law lets a single co-owner make completely on their own.

What Happens When a Co-Owner Sells the Whole Property Anyway

The scenario that actually generates lawsuits is not a co-owner selling their own share — it’s a co-owner, or some but not all of several co-owners, signing a deed that purports to convey the entire property to a buyer who has no idea anyone else has a claim to it. The leading case is Bailon-Casilao v. Court of Appeals, decided April 15, 1988. The Supreme Court held that such a sale is not void; it simply cannot convey more than the selling co-owner actually owned. Applying Article 493, the Court explained that a co-owner’s alienation of the whole property, without the consent of the other co-owners, transfers only the seller’s own undivided share — the buyer becomes a new co-owner of that fractional interest, standing in the seller’s shoes, not the sole owner of the entire property (Bailon-Casilao v. Court of Appeals, G.R. No. 78178, Apr. 15, 1988).

The Supreme Court reaffirmed the same doctrine decades later in Mabalo v. Heirs of Babuyo, decided July 6, 2022. The Court again confirmed that a co-owner may sell their undivided interest under Article 493 even without the consent of the other co-owners, and that such a sale transfers only the seller’s proportionate share to the buyer — nothing more. The case added a separate, practical wrinkle: a co-owner (or someone who has stepped into a co-owner’s shoes through such a sale) who forcibly excludes another co-owner from the property — using force, intimidation, threat, strategy, or stealth — can be held liable for forcible entry, regardless of how the underlying ownership dispute is eventually resolved. Prior, peaceful possession is protected on its own, separately from who ultimately turns out to own what share (G.R. No. 238468, July 6, 2022).

The practical upshot of reading these two decisions together: an unauthorized sale of the whole property is a real legal event with real consequences for a buyer — it just doesn’t play out the way most buyers assume. No one gets to simply call the deal void and walk away; instead, the buyer and the non-selling co-owners typically end up having to sort out their respective shares, usually through a partition.

Co-Ownership Scenarios at a Glance

What Buyers Risk When Buying From Only One Co-Owner

If you buy a property believing you’re getting full ownership, but the person who signed only ever owned a fractional share, you don’t get your money’s worth of property — you get a lawsuit waiting to happen, or at best, an unplanned partnership with strangers. You become a co-owner alongside whoever else was already on the title, with no automatic right to occupy the whole property, collect all the rent, or sell it outright yourself without going through the same consent rules described above.

The fix is almost entirely about verifying the title before you pay rather than resolving a problem after the fact. Pull the actual Transfer Certificate of Title or Condominium Certificate of Title and check how many names appear as registered owners, and whether it reads “Heirs of [deceased person’s name]” rather than a specific living individual — both are signals that you are dealing with co-owned, not sole-owned, property. If the property came from an inheritance that hasn’t been formally divided among the heirs yet, ask for the documentation confirming all heirs have agreed to the sale before relying on a single heir’s signature, and insist that every co-owner named on the title sign the Deed of Absolute Sale, not just the one you happened to negotiate with.

Legal Redemption: The Other Co-Owners’ Right to Step In

Even when a co-owner validly sells only their own share, the other co-owners are not left with no recourse if they wanted first dibs on that share. Article 1620 of the Civil Code gives a co-owner the right of legal redemption whenever another co-owner sells their share to someone outside the co-ownership — meaning the remaining co-owners can step in and buy that share back at the same price the outside buyer paid. Article 1623 sets the clock: that right must be exercised within 30 days from written notice of the sale, and the deed of sale cannot even be recorded with the Registry of Deeds unless it is accompanied by an affidavit that such written notice was actually given to the other co-owners.

The Supreme Court applied this right broadly in Angela M. Butte v. Manuel Uy and Sons, Inc., decided February 28, 1962, allowing an heir of a deceased co-owner to exercise legal redemption over a share her predecessor could have redeemed, holding that the right passes to the heirs along with the rest of the estate (Angela M. Butte v. Manuel Uy and Sons, Inc., G.R. No. L-15499, Feb. 28, 1962, LawPhil). For a buyer, the practical implication is that purchasing a co-owner’s share isn’t necessarily final the moment the deed is signed — if the other co-owners were never formally notified in writing, their 30-day window to redeem that exact share may not have even started running yet.

From an Unauthorized Sale to a Resolution: What Usually Happens Next

1. A buyer typically discovers the seller only held a fractional share when registering the sale, applying for a loan secured by the property, or when another co-owner surfaces to object.
2. The non-selling co-owners may exercise legal redemption within 30 days of written notice if they want to buy back that specific share instead of sharing ownership with a new buyer.
3. If redemption isn’t exercised, or the 30-day window has lapsed, any co-owner — including the new buyer — may demand partition of the property at any time, since that right does not prescribe (Civil Code, Art. 494).
4. Partition can be amicable if everyone agrees on how to divide the property, or judicial under Rule 69 of the Rules of Court if they don’t.
5. If the property genuinely cannot be divided without destroying its value — a single house or condo unit, for example — the court can order it sold entirely, with the proceeds split according to each co-owner’s actual share.
6. Where the property came from an inheritance, this process is often resolved together with, or follows directly from, a formal division of the estate among the heirs.

Worked Example (Hypothetical, Not a Real Transaction)

The scenario below is illustrative only — it is not a real sale, and it is not legal advice.

• Setup: Three siblings inherit a 500-square-meter residential lot in equal one-third shares, titled under “Heirs of Juan Dela Cruz.” They never formally partitioned the land.
• The sale: One sibling, needing cash, signs a Deed of Absolute Sale purporting to convey the “entire lot” to a buyer for ₱3,000,000, without telling the other two.
• What actually transfers: Under Article 493, the sale is valid only as to the selling sibling’s one-third undivided share. The buyer does not acquire the other two-thirds and becomes a co-owner alongside the remaining two siblings.
• The other siblings’ options: If formally notified in writing, the two remaining siblings have 30 days to redeem that one-third share from the buyer at the same ₱3,000,000-equivalent price under Articles 1620 and 1623. If they don’t, any of the three co-owners may instead demand partition.
• Result: Until a redemption or partition actually happens, all three — the two original siblings and the new buyer — remain co-owners of the whole, undivided lot, each entitled to a one-third share of its value or proceeds.

What to Verify Before You Rely on This

• Check the actual title, not just the seller’s word — confirm whether the TCT, CCT, or tax declaration lists more than one owner, or is annotated “Heirs of [name].”
• Get every co-owner’s signature on the Deed of Absolute Sale if you want to buy the whole property — a single co-owner’s signature only ever conveys that one person’s share.
• For inherited property, ask for the settlement documents showing each heir’s confirmed share before relying on a single heir’s authority to sell.
• Ask whether written notice under Article 1623 was ever served on the other co-owners — if it wasn’t, their 30-day redemption window may still be open.
• Have a lawyer review the chain of title and check for any pending partition, redemption, or inheritance dispute before paying the full price.

Frequently Asked Questions

Can a co-owner sell the entire property without asking the other co-owners?

Not validly as to the whole. Under Article 493 of the Civil Code, a co-owner can only sell what they actually own — their own undivided share. If they sign a deed purporting to sell the entire property, the sale is valid only up to their own share, and the buyer becomes a co-owner of that portion alongside the other original co-owners.

Does that mean the sale is void?

No. Philippine courts, starting with Bailon-Casilao v. Court of Appeals in 1988 and reaffirmed in Mabalo v. Heirs of Babuyo in 2022, treat the sale as valid but limited in scope — it simply cannot convey more than the selling co-owner actually owned.

What can the other co-owners do if their share was sold without their knowledge?

They weren’t actually sold — only the signing co-owner’s own share was. But the other co-owners can demand partition of the property at any time, since that right does not prescribe under Article 494. They may also have the right to redeem the sold share from the buyer within 30 days of receiving written notice of the sale, under Articles 1620 and 1623.

What happens if the co-owners can’t agree on how to physically divide the property?

Any co-owner may file a judicial partition action under Rule 69 of the Rules of Court. If the property cannot be conveniently divided — a single house or condo unit, for example — the court can order it sold and the proceeds distributed according to each co-owner’s share.

Can a buyer just move in and use the whole property after buying one co-owner’s share?

Not without risk. Under Mabalo v. Heirs of Babuyo, a co-owner — or a buyer who steps into a co-owner’s shoes — who forcibly excludes the other co-owners from the property through force, intimidation, or stealth can be held liable for forcible entry, separate from however the underlying ownership dispute is eventually resolved.

Is a co-owner allowed to make improvements or lease out the whole property on their own?

Generally, no. Ordinary acts of administration, like a short-term lease, require consent from co-owners representing a majority interest under Article 492. Major alterations — new construction, a long-term lease, or a change in how the property is used — require the consent of all co-owners under Article 491.

Does this rule apply to condo units the same way it applies to land?

Yes. Article 493 applies to any co-owned real property, including a condominium unit or a house and lot jointly titled or inherited by multiple heirs — not just vacant or agricultural land.

What to Do Next

If you’re buying property, check the title for multiple registered owners or a “Heirs of” annotation before you pay anything, and insist that every co-owner sign the deed if you expect to receive full ownership. If you’re a co-owner considering a sale, remember that your signature alone can only ever transfer your own share — never someone else’s — and that selling the whole property without the others’ consent will not give your buyer what they think they’re paying for. If you’re already caught in a dispute over a sale made without your consent, a partition action, not simply trying to cancel the sale, is usually the practical way forward — see our guide on extrajudicial settlement of an estate if the property came from an inheritance that was never formally divided.

Figures and legal provisions in this article reflect published statutory text and Supreme Court decisions as of October 6, 2026, including a Supreme Court decision (G.R. No. 238468) decided in 2022 that remains the most recent direct guidance from the Court on this point. This article is general information, not legal advice — co-ownership disputes often turn on the specific facts, title history, and family arrangements involved, so always confirm your situation with the Registry of Deeds or a licensed Philippine real estate lawyer before relying on this guide for an actual transaction.