How to Buy Property in Koh Samui: A Step-by-Step Guide for Foreign Buyers

Buying property in a foreign country sounds daunting, but on Koh Samui the process is well trodden and, with the right help, genuinely straightforward. From an accepted offer to the keys in your hand typically takes eight to ten weeks. The process itself is not complicated, but it has an order, and most of the expensive mistakes come from doing the steps in the wrong sequence or skipping one to save time or money. Here is the process, start to finish, for a foreign buyer.

If you are still working out what your money buys here, start with our 2026 price guide, and if you have not settled on a part of the island yet, the area guide covers that. This article is about what happens once you are ready to move.

Step 1: Get Your Ownership Structure Clear First

Before you even view, understand what you can own. As a foreigner you cannot own land, so a villa is typically held on a 30 year registered lease with ownership of the building, while a condominium can be owned freehold within the building's 49% foreign quota. Knowing which route applies to the property you want shapes everything that follows, so settle this before you fall for a specific home. The options and what they genuinely mean for a foreign buyer are covered in our 2026 legal guide. The short version: there are proper routes and there are shortcuts, and the shortcuts are where the horror stories come from.

Be honest about what you are buying for, too. A home you plan to live in, a villa that has to earn rental income, and a plot you intend to build on are three different purchases with different checks and different ideal locations. Most buyers here are some mix of lifestyle and investment, and the right answer is usually a percentage, not a label. If the numbers side matters to you, our piece on whether Koh Samui property is a good investment in 2026 is the honest version.

Step 2: Set the Full Budget and Find the Property

Set a realistic all-in budget that includes not just the purchase price but the transfer costs, taxes and legal fees: typically another 3 to 6% for a freehold purchase, or around 1.1% lease registration for leasehold, plus roughly 125,000 to 300,000 baht in legal fees. A villa in a tropical climate also needs a maintenance reserve from day one. Fixing the total before you view keeps the shortlist honest.

Then find the property, ideally through an agent who knows the island and can confirm the ownership structure before you get attached. A good viewing trip is five to eight properties over two or three days, not twenty in a week. Visit at different times of day, drive the access road yourself, in the rain if you can get it, and check your phone signal from the terrace. If you are not on the island yet, video viewings are a sensible filter, but they are a filter, not a substitute. Nobody should buy a villa they have not stood in.

Step 3: Make an Offer

Offers on Koh Samui are made in writing through the agent, and negotiation is normal practice here, not an insult. Buyers typically agree somewhere between 8 and 12% below the asking price, with older villas seeing the larger movement once a survey has surfaced the tropical wear and tear.

Negotiate the whole deal, not just the price. The furniture package, what stays and what goes, the completion timeline, and who pays which share of the transfer costs are all on the table, and they are worth real money. A clean offer at a fair number with simple terms often beats a lower offer wrapped in conditions.

Step 4: Reservation Agreement and Deposit

Once the price is agreed, a reservation agreement takes the property off the market while the legal work happens. The reservation fee is typically 5%, and it sets the timetable: how long you have to complete due diligence and sign the full contract, usually 45 days or so.

Read this document before you pay anything. The one clause that matters most is what happens to your deposit if due diligence turns up a genuine problem with the title or the property. A properly drafted reservation returns it in that case. A badly drafted one keeps it whatever happens, and by the time you discover that, the money has gone. The deposit is normally held rather than released straight to the seller, and it counts toward the purchase price at completion.

Step 5: Due Diligence, the Step You Never Skip

This is the heart of a safe purchase and the one step nobody should ever compress. Budget two to three weeks, and use your own independent Thai property lawyer, never one suggested by the seller or the developer. On an island this size everyone knows everyone, and independence is the whole point of the exercise.

A proper due diligence covers:

• Title search. Verifying the title deed, that the seller genuinely owns and can sell the property, and that the boundaries on paper match the boundaries on the ground.

• Encumbrances. Any mortgages, liens or unpaid obligations registered against the title.

• Access. Legal, registered access to the property, not just a road that happens to be there. This catches more hillside buyers than anything else on this list.

• Permits. Confirming building permits, that the property is legally built, and for land, what you are actually allowed to build on it.

• The structure. For a leasehold, reviewing the lease terms and registration. For a condo, confirming the foreign quota has capacity.

If due diligence comes back clean, you move to contract. If it does not, this is exactly the moment a well drafted reservation agreement earns its keep. Skipping or rushing this step is where buyers get badly caught out. It is worth every baht of the legal fee.

Step 6: Sign the Sale and Purchase Agreement

With due diligence clear, both parties sign the Sale and Purchase Agreement. It sets out the price, the payment schedule, the completion date, what is included (furniture, fittings), and who pays which fees. Your lawyer drafts or reviews it; never sign a contract you have not had checked independently. For a completed villa the structure is simple: the deposit already paid, then the balance at transfer. For an off plan purchase, payments are staged against construction milestones, and the contract should tie each payment to verifiable progress, not to dates on a calendar.

Step 7: Transfer the Funds Correctly

For a foreigner, this step has a specific legal requirement. Your purchase funds must be transferred into Thailand from abroad in foreign currency, with the stated purpose being the property purchase. Your Thai bank then issues a Foreign Exchange Transaction form (the FET, sometimes called a Tor Tor 3), which documents the inbound transfer. You need this document at the Land Office to register freehold ownership, and the amount should equal or exceed the purchase price. Get this right, because it cannot easily be fixed retroactively, and keep all the bank paperwork: it also makes life far easier if you ever want to take the money out of Thailand again after a future sale. Allow a few days for international transfers to clear before completion day.

Step 8: Transfer Day at the Land Office, and After

Completion happens at the Land Office, where the transfer is formally registered. Both parties, or their appointed representatives, attend, the balance is paid, the transfer fees and taxes are settled at the counter, and the ownership changes on the title itself: your name, your company's name, or a 30 year registered lease recorded on the deed. You do not have to be there in person. It is common and perfectly normal for your lawyer to attend with a Power of Attorney, which is how most overseas buyers complete. The Land Office does not accept credit cards, so the funds must be arranged in advance.

By the end of the day you hold the keys and the paperwork. What remains is the ordinary business of taking over a house: utilities moved into the right name, insurance in place, and a decision about management if the villa will be rented or will sit empty between your visits. A villa in this climate should never simply be locked and left.

The Mistakes That Actually Cost People Money

After years of watching purchases go right and occasionally go wrong, the failures are remarkably consistent:

• Skipping or rushing due diligence to save a few weeks on a purchase worth millions. This is the single most expensive economy on the island.

• Using the seller's or developer's lawyer. Convenient, cheaper, and a conflict of interest by definition.

• Paying a deposit before reading the reservation agreement, then discovering it is not refundable under any circumstances.

• Taking a brochure's lease arithmetic at face value. Whatever a sales document promises about extensions, what is actually registered on the title is a 30 year lease, and that is the number a sensible buyer plans around.

• Getting the money transfer wrong. Funds brought in the wrong way, without the FET paperwork, cause problems at registration and again years later at resale.

• Buying the view and forgetting the house. The sea view is why you came, but the road, the water supply, the build quality and the running costs are what you live with.

None of these are hard to avoid. They just require doing the steps in order, with people who work for you rather than for the seller. If you take one thing from this guide: use an independent, qualified Thai property lawyer from the start. Their fee is small relative to the purchase, and nearly every horror story you will hear about buying in Thailand comes down to someone skipping proper, independent legal advice.

Buying With Someone on Your Side of the Table

The process is well established and, handled properly, smooth. At Samui Property Portfolio, we guide international buyers through each of these steps: an honest read on the property and the price, trusted independent lawyers on the diligence, the negotiation run on your side of the table, and someone still answering the phone after the keys are handed over. If you would like a clear walk-through for the property you have in mind, we are happy to help.