Country Guide

Private Islands of Thailand

Thailand offers some of the most beautiful island geography on the market, limestone karst in Phang Nga Bay, coconut estates in the Gulf, an international airport twenty minutes from several of them. It also offers a legal environment in which a foreigner cannot own the land at all. Any search for a private island for sale in Thailand begins by holding both facts together. This guide covers the two coastal markets, the structures through which foreigners actually hold Thai islands, the deeds that matter, and the diligence that separates a sound acquisition from an expensive misunderstanding.

Two seas, two markets

Thailand's islands divide into two theatres that behave as different markets.

The Andaman coast, on the west, runs from Ranong down through Phang Nga, Phuket, Krabi and Trang to Satun, and holds most of the country's marketed island stock: dramatic karst, deep anchorages, established marine infrastructure, and Phuket International Airport close at hand. Phang Nga Bay, between Phuket and Krabi, carries the highest-profile example, Rangyai Island, at around 110 acres the largest island publicly marketed near Phuket and roughly twenty minutes from the airport. The Andaman also carries the bulk of the high-season charter and dive traffic, and with it the rental case.

The Gulf of Thailand, on the east, offers two clusters: the Samui archipelago off Surat Thani, and the eastern seaboard around Trat, where the Koh Chang group lies. Gulf islands tend to be lower, greener and quieter, old coconut estates rather than karst monuments, trading less often and with less publicity. Sellers here are more likely to be Thai families holding possessory paper of long standing, which puts the title question at the very centre of any Gulf purchase.

The central legal fact: foreigners cannot own the land

Under Thailand's Land Code, foreign nationals are barred from owning land freehold, and the narrow statutory exceptions do not realistically extend to islands. No permit changes this, and no price makes it stop being true. What a foreign buyer acquires in Thailand is never the land itself but a bundle of rights over it. The instruments in practical use are these.

The 30-year registered lease. A lease registered on the title at the Land Office is enforceable for its term; 30 years is the maximum registrable term. Renewal clauses promising further terms are common and are contractual undertakings, not statutory entitlements: they bind the person who signed them, not the land or its next owner. Price the lease on the registered term and treat renewals as hope rather than asset.

Usufruct. Thai law registers usufructs for up to 30 years or the holder's lifetime: a right to use the property and take its fruits without owning it, suited to a single lifetime of use and ending with the holder. How it compares with leasehold and freehold elsewhere is set out in our global guide to freehold, leasehold and usufruct.

Ownership of structures. A foreigner may own buildings separately from the land beneath them, typically alongside a lease or a registered right of superficies. On a developed island this matters: the villa can be yours outright even where the beach it stands on cannot.

The Thai limited company. Many islands are marketed through a Thai company that owns the land, with the foreign buyer taking up to the permitted 49 percent of shares. Where the Thai majority shareholders are genuine investors, the structure is lawful. Where they are nominees holding shares for the foreigner's benefit, it is not: nominee arrangements to evade the ownership bar are unlawful under the Land Code and the Foreign Business Act, the authorities do investigate, and the sanction can reach forced disposal of the land. A company structure inherited from a seller should be audited, not assumed, by independent Thai counsel instructed by you and not by the seller.

In Thailand you do not buy the island; you buy a bundle of rights over it. The bundle, not the beach, is what the money purchases.

Reading the paper: Chanote and the lesser deeds

Thai land documents form a hierarchy, and on islands the lower rungs are far more common than the top. A listing that says "titled land" without naming the instrument has told you nothing.

Two island-specific cautions. First, since the mid-1990s Thai regulation has generally barred new title deeds on islands except where earlier documented rights existed; much island land therefore carries lesser paper or none, and an "upgrade to Chanote" promised by a seller may be legally impossible. Confirm the position with counsel before it becomes part of the price. Second, a genuine island Chanote is rare and commands its premium for a reason: it is the only document in the table whose boundaries were fixed on the ground.

Overlays: reserved forest, national parks and the shoreline

Thailand's forest law defines forest broadly enough to sweep in islands and seashores never lawfully acquired by anyone, and large parts of both coasts sit inside national reserved forest or marine national parks, Ang Thong in the Gulf, much of Phang Nga Bay and the Tarutao group in the Andaman. Land inside these designations cannot be privately titled unless the rights predate the designation, and occupation without rights is encroachment, an offence carrying serious criminal penalties and eviction regardless of what was paid or built. Where a boundary between private paper and reserve is disputed, the reserve tends to win.

Below the vegetation line, foreshore and seabed are state property. Jetties, moorings and any overwater structure need official consent, and coastal building is further constrained by environmental and setback rules. None of this makes a Thai island undevelopable; it means the development envelope is set by the overlays as much as the deed, and both must be mapped before an offer.

An island with a Chanote is rare. An island with clean lesser paper is workable. An island inside reserved forest is a holiday, not a holding.

Seasons and access

The two coasts run on opposite calendars. The Andaman takes the southwest monsoon from roughly May to October, when seas are rough and some crossings stop, and has its dry, settled season from November to April. The Gulf is broadly the reverse, usable through much of the Andaman's wet months, with its heaviest rain arriving on the northeast monsoon from around October to December and November the wettest around Samui. For a buyer this cuts three ways: view and survey in the bad season, not the brochure season; design jetties and landings for the monsoon fetch; and note that the charter year on each coast is seasonal, not continuous.

Access is a genuine Thai strength. Phuket and Krabi international airports serve the Andaman stock, Samui and Surat Thani serve the archipelago, and Trat serves the eastern Gulf; most marketed islands lie between ten minutes and an hour by boat from a gateway. Rangyai's twenty-minute run from Phuket is about as good as island access gets anywhere.

What the market asks

Public asking figures span a wide band, and they are asking figures, not evidence of value. Small or lesser-titled islets have been marketed from the low single-digit millions of US dollars; mid-size Andaman islands with workable paper tend to ask in the single-digit to low tens of millions; and the largest, best-located islands reach far higher, Rangyai has carried a US$160 million headline in past marketing, and Koh Kham in the eastern Gulf was publicly listed in 2024 at 1.8 billion baht. Treat every such number as indicative only. Tenure does most of the work in Thai pricing: a 30-year lease is not a freehold and should never be priced as one, and an unverifiable title is not cheap at any figure. Current availability sits in our islands for sale listings.

Diligence flags particular to Thailand

The general discipline is set out in our guide to buying a private island and the due-diligence checklist. On a Thai island, weight these points:

• Title chain to origin. Trace the document to its first issue, not just the last transfer. Island titles issued irregularly have been revoked years later, and revocation reaches the current holder.
• Ground survey against the deed. Where boundaries derive from aerial survey, commission a ground survey and reconcile the two before contract.
• Forest and park overlays. Verify against official forest and national-park mapping that no part of the parcel, or its beach, sits inside a reserve. Encroachment is a criminal matter, not a negotiating point.
• Structure audit. If the land sits in a Thai company, establish who the Thai shareholders really are, where their capital came from, and whether the arrangement would survive official scrutiny.
• Registration, not paperwork. A lease or usufruct protects you only once registered on the title at the Land Office. Unregistered side agreements protect nobody.
• Foreshore and water. Confirm consents for any jetty or overwater structure, and establish the fresh-water position early; many Gulf and Andaman islets have none.
• Independent Thai counsel. Instructed by you, paid by you, asked to say no. Anything above that cannot be verified: confirm with counsel, do not proceed on assurance.

A closing orientation

Thailand rewards the buyer who wants a supremely accessible, supremely beautiful island for a defined period of use, and who prices the instrument honestly. It punishes the buyer who imports a freehold expectation into a jurisdiction that does not sell one. Settle the structure first, read the deed by its proper name, map the overlays, and the Andaman or the Gulf will give you as fine an island life as anywhere on earth.

If you hold a Thai island and wish to bring it to a qualified audience, you can register an island with us. If you are searching and would rather the market came to you, quietly and pre-screened, commission a search mandate and we will read the water first.

General orientation, not legal or tax advice. Thai land law changes and is applied locally; verify every point above with independent Thai counsel before committing funds.