In Q1 2026, the average price discount on off-plan purchases in Phuket sits at 12% to 22% relative to ready units in the same project, based on our estimates. That is a concrete financial advantage, but it comes attached to construction, currency, and legal risks that deserve careful analysis. Below we break down the mechanics of an off-plan transaction step by step.
Our analysts monitor construction progress across Phuket's key districts - Bang Tao, Layan, Kamala, Surin, Rawai, and Nai Harn - as well as Bophut, Maenam, and Lamai on Koh Samui. The data presented here draws on our review of several dozen active developer projects and the contractual frameworks in use on both markets as of 2026.
Quick answer
- Off-plan vs. secondary-market discount runs approximately 12-22%, depending on location and entry stage (as of 2026)
- Typical payment schedule splits the purchase price across 5-7 instalments spread over 18-30 months of construction
- Reservation deposits are normally 100,000-300,000 THB; in premium projects in Layan and Kamala they can reach 500,000 THB
- Buyer payments go directly to the developer - there are no protected holding accounts for foreign buyers in Thailand, so contractual protections and the developer's financial health are the primary safeguards
- Delay penalties in well-drafted contracts run 0.01-0.05% of the contract value per day
- Completion guarantees (corporate or bank guarantee) are rare but negotiable on purchases above 10 million THB
Options and scenarios
Three dominant payment-schedule structures
In our data sets we consistently observe three payment-schedule archetypes. Each places buyer exposure at a different point in the construction timeline.
Option A - front-loaded schedule. The developer collects 50% of the price before the shell structure is complete. Buyer risk is highest in the early phase, but this model typically offers the largest discount (18-22%). We see it most often with smaller developers in Rawai and Nai Harn who fund construction directly from buyer payments.
Option B - balanced schedule. Payments are distributed roughly evenly across the construction period. Reservation and contract signing together account for 30-35% of the price; the remainder arrives in 10-15% tranches tied to verified construction milestones. This is the most common structure in Bang Tao, Layan, and Kamala, used by developers with mid-size and larger project portfolios.
Option C - back-loaded schedule. The buyer pays only 20-25% before handover, with 40-50% due at key collection. This minimises construction-risk exposure but is offered infrequently - mainly by developers with self-financing capacity or bank credit lines. On Koh Samui we see it occasionally in premium villa projects in Bophut.
The discount arithmetic
A reference scenario from our 2026 data: a 45 sq m condominium in Bang Tao at the pre-sale stage is priced at 4,200,000 THB. A comparable ready unit in the same subdistrict trades on the secondary market at 5,100,000-5,400,000 THB, implying a discount of roughly 17-22%.
On Koh Samui, in Maenam, the gap is narrower - our analysts estimate 12-16% - reflecting lower secondary-market liquidity and a smaller pool of comparable transactions.
One critical framing point: the off-plan discount is not equivalent to profit. It is a premium paid by the developer to compensate the buyer for construction-period risk, currency risk (THB fluctuations), and developer default risk. A realistic return calculation must subtract the cost of tied-up capital over 18-30 months of construction, plus any adverse currency movement.
Comparison table
| Parameter | Option A - Front-loaded | Option B - Balanced | Option C - Back-loaded |
|---|---|---|---|
| Reservation deposit | 5-10% of price | 5-10% of price | 5-10% of price |
| Payment at contract signing | 30-40% | 20-25% | 10-15% |
| Milestone tranches during construction | 20-30% (2-3 tranches) | 30-40% (3-5 tranches) | 10-15% (2-3 tranches) |
| Final payment at handover | 20-30% | 25-35% | 40-50% |
| Typical discount range | 18-22% | 14-18% | 10-14% |
| Exposure at 50% construction | 60-80% of price paid | 40-55% of price paid | 25-35% of price paid |
| Where typically observed | Rawai, Nai Harn | Bang Tao, Layan, Kamala | Bophut (Koh Samui), Surin |
| Developer profile | Small, buyer-funded construction | Mid-to-large portfolio | Large, self-financed |
Risks and mistakes
Phase 1 - foundations and EIA (months 1-6)
This is where systemic risk is highest. An Environmental Impact Assessment (EIA) is mandatory for projects exceeding 80 units in Phuket. Delays in EIA approval can extend 6-12 months beyond the originally planned timeline. We verify on the ground whether a developer holds an approved EIA before any reservation payment is made. If the EIA is still pending, the reservation deposit should be fully refundable until the building permit is granted.
The critical contractual protection here is a condition precedent clause making the contract effective only upon receipt of the building permit and EIA approval.
Phase 2 - shell structure (months 6-14)
Delays at this stage typically originate from supply-chain disruptions and labour shortages. Across Phuket projects tracked in 2025, we recorded average delays of 2-4 months during the shell phase. The buyer-protective clause is a late-delivery penalty (penalty for late delivery). An acceptable minimum is 0.01% of the contract value per day - on a 5,000,000 THB unit that equals 500 THB per day.
A common mistake we observe: buyers accepting contracts with no defined completion date. Without a specific date, there is no contractual basis for calculating or claiming delay penalties.
Phase 3 - interior fit-out (months 14-22)
This phase is statistically the most delay-prone. We also monitor projects where developers quietly downgrade finish specifications relative to what was agreed at the pre-sale stage. Protection against this is a detailed material specification annex attached as an integral part of the contract. Without it, buyers have no enforceable benchmark against which to raise a defect claim.
Phase 4 - technical handover inspection
Before signing any acceptance protocol, buyers should commission an independent snagging inspection by a qualified third-party surveyor. Based on current market rates, the cost runs 15,000-30,000 THB. Signing the handover document without a prior inspection effectively closes the path to warranty-based repairs.
What the absence of buyer-fund protection means in practice
Buyer payments in Thailand flow directly into the developer's account. In the event of developer insolvency, the buyer becomes an unsecured creditor. Given this structure, the real protective mechanisms are:
- Developer financial-health verification - our analysts check filings at Thailand's Department of Business Development (DBD) under the Ministry of Commerce
- Completed-project track record - a developer with 3-5 delivered projects represents materially lower risk than one without
- Land ownership structure - whether the developer holds freehold title to the plot or operates under a lease
- Termination clause with refund provisions - contractual right to withdraw and recover payments under specified conditions
FAQ
What is the typical reservation deposit for off-plan property in Phuket?
The standard range is 100,000-300,000 THB (Q1 2026 figures). Premium projects in Layan and Kamala can require up to 500,000 THB. The reservation amount should be credited against the final purchase price and be conditionally refundable until the main contract is signed.
Can a foreign buyer obtain a mortgage for an off-plan purchase in Thailand?
Thai banks do not generally extend mortgage financing to foreign nationals. Off-plan purchases are funded entirely from the buyer's own capital according to the agreed payment schedule. Some developers offer internal instalment programmes after building completion, but interest rates on these typically run 5-8% per year.
How do we verify a Phuket developer's credibility before committing funds?
We cross-check the company register at the DBD, review the developer's completed-project history, confirm building permits with the local authority, and gather feedback from contractors active in the market. Our analysts recommend visiting the sites of earlier projects delivered by the same developer.
When does ownership transfer take place on an off-plan purchase?
Ownership transfer happens at the Land Office after construction is complete and the final instalment is paid. The standard transfer fee is 2% of the official assessed value, conventionally split equally between buyer and seller. The transfer appointment is usually set 30-60 days after the acceptance protocol is signed.
What taxes apply to a foreign buyer purchasing off-plan in Thailand?
At purchase: the transfer fee (approximately 1% after the conventional split) plus a stamp duty of 0.5%. On a subsequent resale: withholding income tax plus Specific Business Tax of 3.3% if the property is sold within five years. These costs should be incorporated into any total-return calculation from the outset.
Can a buyer exit an off-plan contract after paying several instalments?
This depends entirely on the contract terms. In the majority of agreements, buyer-initiated termination results in forfeiture of some or all payments already made - typically 25-50% of the total paid to date. Negotiating a clear termination clause before signing is one of the most important steps in the entire transaction.
How does THB currency movement affect off-plan investment returns?
With payment schedules stretched over 18-30 months, buyers carry ongoing currency exposure. Based on 2025 trading ranges in our data sets, THB fluctuated within a band representing roughly 5 percentage points of value. On a 5,000,000 THB commitment, a 5% adverse move represents a material cost. Converting a larger portion of funds at the outset can reduce this exposure.
How does off-plan in Phuket compare to off-plan on Koh Samui?
Phuket offers a larger project pool - we estimate over 120 active off-plan projects in 2026 - together with higher typical discounts and deeper secondary-market liquidity. Koh Samui has a smaller supply base (approximately 25-35 active projects), narrower off-plan discounts of 12-16%, but potentially stronger rental yield potential in the villa segment in Bophut and Maenam.
Our overall assessment: off-plan purchases in Phuket and Koh Samui in 2026 offer a measurable price advantage, but that advantage depends on thorough developer due diligence, careful contract negotiation, and disciplined currency-risk management. Based on our analysis, Option B (balanced payment schedule) represents the most favourable trade-off between discount depth and risk exposure - provided the contract includes enforceable delay penalties and a clearly defined termination clause.
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