In Q1 2026, our analysts estimate the average price discount for off-plan residential units in Phuket at 15% to 25% relative to the market value of a completed, equivalent property. On Koh Samui the gap is narrower, running at roughly 10% to 18%. These figures are meaningful, but without a clear understanding of payment mechanics and the real risk profile at each construction phase, they remain little more than a developer's marketing headline.
We monitor construction progress across Phuket's key districts - Bang Tao, Layan, Kamala, Surin, Rawai, and Karon - as well as Bophut and Maenam on Koh Samui. This article breaks the off-plan purchase process into its component parts: payment schedules, phase-by-phase risk exposure, and the specific contractual provisions that actually protect a buyer.
Quick answer
- Off-plan discount in Phuket sits at roughly 15-25% against completed-unit pricing, as of Q1 2026
- Typical payment schedules are structured across 5-7 tranches spread over 18-30 months of construction
- Reservation deposits generally run 50,000-200,000 THB (approximately USD 1,400-5,600 at mid-2026 rates)
- In Thailand, there are no escrow accounts for foreign property buyers - all payments go directly to the developer
- The primary protection for a buyer lies in contract language: delay penalties, withdrawal conditions, and completion guarantees
- Maximum financial exposure typically occurs once 40-50% of the purchase price has been paid, which usually coincides with the shell-and-core stage
Options and scenarios
How payment schedules structure buyer exposure
Three distinct payment models are common in Phuket and Koh Samui contracts reviewed by our team. Each creates a different risk profile.
Model A - Standard (mid-market developer, Rawai, Karon)
The buyer pays a reservation fee of 1-3% of the price, followed by 25-30% at contract signing. Subsequent tranches are tied to construction milestones: foundations (10%), shell and core (10-15%), fit-out (10-15%), and handover (30-40%). By the shell-and-core stage, the buyer has typically paid roughly 50-55% of the total, with a significant share - around 35% - deferred to handover.
Model B - Front-loaded (budget developer, Nai Harn, Chalong)
Reservation 3-5%, contract 35-40%, foundations 15%, shell and core 15%, fit-out 10%, handover 15-20%. The buyer crosses the 60% paid threshold as early as the foundation stage. This is the highest-risk structure: the developer captures cash early and the buyer loses negotiating leverage before the building is even out of the ground.
Model C - Back-loaded (premium developer, Bang Tao, Layan, Surin)
Reservation 1-2%, contract 15-20%, foundations 5%, shell and core 10%, fit-out 10%, handover 50-55%. The buyer has paid only 40-45% by the time handover arrives. This structure offers the strongest negotiating position and the lowest exposure if the developer encounters difficulties.
The real arithmetic of the off-plan discount
Consider a representative example from Bang Tao, based on 2026 market data in our tracking sets. A 45 sq m unit in an off-plan project with a 24-month construction timeline is offered at 4,200,000 THB. A comparable completed resale unit in the same sub-district is priced at approximately 5,200,000 THB, per our estimates.
The nominal discount is 1,000,000 THB, or 19.2%. Once the cost of capital locked up over 24 months is factored in - our analysts estimate an opportunity cost of 3-5% per annum - and accounting for typical delay risk, the effective discount narrows to roughly 12-16%. That is still a meaningful margin, but it requires careful vetting of the developer's delivery record.
In Bophut on Koh Samui, we observe a comparable unit offered off-plan at approximately 3,800,000 THB, against a completed-market price of around 4,500,000 THB - a nominal discount of 15.6%, which corrects to roughly 9-13% on an effective basis after capital cost adjustment.
Comparison table
| Parameter | Model A - Standard | Model B - Front-loaded | Model C - Back-loaded |
|---|---|---|---|
| Reservation | 1-3% | 3-5% | 1-2% |
| Payment at contract signing | 25-30% | 35-40% | 15-20% |
| Cumulative paid after foundations | 35-43% | 53-60% | 21-27% |
| Cumulative paid after shell and core | 50-55% | 68-75% | 31-37% |
| Payment at handover | 30-40% | 15-20% | 50-55% |
| Typical locations | Rawai, Karon | Nai Harn, Chalong | Bang Tao, Layan, Surin |
| Risk exposure | Medium | High | Low |
| Buyer negotiating position | Moderate | Weak | Strong |
Risks and mistakes
Phase 1: Permits and Environmental Impact Assessment (EIA)
In Phuket, projects exceeding 80 residential units or situated on hillside terrain require a formal Environmental Impact Assessment. The EIA process takes 6 to 18 months and is the most common cause of delays before a single foundation is poured. Based on data we monitor, at least four large projects in the Kamala and Layan areas experienced delays of more than 12 months in 2024-2025 due to unresolved EIA requirements.
Practical safeguard: Before paying any reservation, we verify that the developer holds both an approved EIA and a valid Construction Permit. Without these two documents in hand, any deposit is effectively funding a speculative pre-permit phase.
Phase 2: Foundation and structural construction
The primary risks here relate to build quality and adherence to specifications. Phuket's monsoon season (May through October) routinely causes ground-works delays of 4 to 8 weeks per affected year.
Practical safeguard: The contract should explicitly grant the buyer the right to carry out inspections at each construction milestone, or to appoint an independent structural inspector at their own cost.
Phase 3: Shell and core completion
This is the most financially exposed moment for buyers on Models A and B, where more than 50% of the purchase price has already been transferred. If the developer encounters cash-flow problems at this stage, the buyer has limited leverage. Construction halts at shell-and-core level do occur in the Thai market and should be treated as a real, not theoretical, scenario.
Practical safeguard: The contract must include a delay penalty clause - the market standard in Phuket runs at 0.01-0.05% per day of the cumulative amount paid, for each day beyond the agreed completion date - and a right to withdraw with full refund of all payments made if the delay exceeds a defined threshold (typically 90 to 180 days).
Phase 4: Fit-out and technical handover
The most frequent issues at this stage are material specifications not matching the sales agreement, defects in electrical and plumbing installations, and discrepancies between rendered visuals and actual finishes.
Practical safeguard: A formal punch-list protocol with a 30-60 day remediation deadline, and the contractual right to withhold the final tranche (typically 5-10% of the price) until all listed defects are resolved.
Common structural mistakes in off-plan purchases
- Paying a reservation deposit on a project that has not yet received EIA approval or a Construction Permit
- Accepting a front-loaded payment schedule without attempting to negotiate more balanced terms
- Signing a contract without a delay penalty clause
- Skipping independent verification of the developer's track record (number of projects completed, on-time delivery rate)
- Calculating the off-plan discount without adjusting for the cost of locked-up capital and currency risk (THB against the buyer's home currency)
- Not engaging an independent Thai-licensed lawyer for the transaction - full transaction legal coverage in Phuket typically costs 30,000-80,000 THB
FAQ
Is buying off-plan in Phuket safe given there are no escrow protections?
In Thailand, there are no escrow accounts protecting foreign buyers' payments on residential property. The only meaningful safeguards are contractual: delay penalties, withdrawal rights, completion guarantees, and the developer's own track record. Thorough due diligence on the developer's history of delivering completed projects on time is essential before any payment is made.
What is the typical reservation deposit for an off-plan unit in Phuket in 2026?
Generally between 50,000 and 200,000 THB (approximately USD 1,400-5,600). In premium projects in Bang Tao or Layan, the reservation usually represents 1-2% of the unit price. This deposit is typically non-refundable unless the contract specifies otherwise.
What off-plan discount is realistic in Phuket right now?
Based on our Q1 2026 estimates, the nominal discount runs at 15-25% against comparable completed-unit pricing. After adjusting for the cost of capital locked up during the build period and the probability of delays, the effective discount narrows to roughly 10-18%.
How do we verify a Thai developer's credibility?
Our analysts track several indicators: number of completed projects, on-time delivery record for prior developments, corporate ownership structure (verifiable via the DBD - Department of Business Development registry), feedback from local expatriate communities, and physical on-site progress observations. Developers listed on the SET (Stock Exchange of Thailand) are subject to additional financial reporting requirements, which adds a layer of transparency.
Can a foreigner own a condominium unit freehold in Phuket?
Yes. Under the Condominium Act, a foreign national may hold a unit on freehold title, provided the aggregate foreign ownership in the building does not exceed 49% of total floor area. Purchase funds must be remitted from abroad in a foreign currency, and the receiving Thai bank issues a Foreign Exchange Transaction Form (FETF), which is required for the title transfer process.
What delay penalty terms should an off-plan contract contain?
The Phuket market standard is 0.01-0.05% per day of the total amount paid, for each day of delay beyond the agreed handover date. Our analysts recommend negotiating for a rate of at least 0.03% per day, combined with a right to full withdrawal and refund if the delay exceeds 90-180 days.
What tax obligations apply to a foreign buyer of off-plan property in Thailand?
At the point of transfer, the buyer typically shares responsibility for a transfer fee of 2% of the appraised or transaction value (whichever is higher) and a stamp duty of 0.5%. Foreign buyers who generate rental income or a capital gain from the property are subject to Thai withholding tax. Buyers who are tax residents in other jurisdictions should verify whether a double-taxation treaty between Thailand and their home country applies - Thailand has such treaties in force with a number of countries.
How long does a typical condominium project in Phuket take to build?
For projects in the 50-150 unit range, construction generally takes 18-30 months from the date of Construction Permit issuance. Smaller projects (under 30 units) can be delivered in 12-18 months. Delays of 3-6 months are common enough in the Thai market that they should be treated as the base-case scenario, not the exception, in any financial projection.
Researching property in Phuket or Koh Samui? Get in touch - our analysts will prepare a data brief for your shortlisted location.