In Q1 2026, the price discount for off-plan purchases in Phuket averages 15-25% relative to comparable resale units - based on our monitoring of active developments in Bang Tao, Layan and Kamala as of March 2026. In Koh Samui, specifically the Bophut and Maenam corridors, the range is wider: 12-30%, reflecting the shallower liquidity of that island's secondary market.
Our analysts currently track over 40 active development projects across both islands. Three variables determine the real risk level for a buyer: the payment schedule structure, the contractual protections written into the sale and purchase agreement, and the developer's verifiable track record. Below we break down the off-plan transaction mechanism in detail.
Quick answer
- Off-plan discount vs resale in Phuket runs approximately 15-25%; in Koh Samui 12-30% (as of Q1 2026, per our data sets)
- Typical payment schedule consists of 5-7 installments spread across 18-30 months of construction
- Reservation deposit is generally 50,000-200,000 THB, deducted from the final purchase price
- There are no escrow accounts for foreign property buyers in Thailand - contractual clauses and developer due diligence are the only available safeguards
- Delay penalties in well-drafted contracts range from 0.01-0.05% of contract value per day of delay
- Withdrawal rights triggered after an agreed overrun period (typically 90-180 days) should guarantee full return of all funds paid
Options and scenarios
Standard off-plan payment schedule - Phuket and Koh Samui
Across our data sets, the following installment pattern appears most frequently. Percentages are indicative and vary by developer.
Stage 1 - Reservation. Payment of 50,000-200,000 THB, credited against the final price. This triggers a 14-30 day window to execute the sale and purchase agreement. Buyer financial exposure at this point: minimal (approximately 1-3% of property value).
Stage 2 - Contract signing. Payment of 25-35% of the property price (net of the reservation deposit). From this point the buyer has a significant sum committed, often while the site is still at land preparation stage. Exposure: moderate.
Stage 3 - Foundation completion. A further 15-25% is due. Cumulative exposure reaches 45-60% of contract value. In Phuket, the foundation stage typically takes 2-4 months from the start of groundworks.
Stage 4 - Structure completion. Payment of 10-20%. Cumulative exposure: 60-75%. We observe that on Koh Samui this stage is often the longest - 4-8 months - partly due to the logistics of delivering construction materials to the island.
Stage 5 - Fit-out and installations. Payment of 5-15%. Cumulative exposure: 70-85%. Delay risk increases at this stage: imported finishing materials (European sanitary fittings, natural stone) regularly extend timelines by 4-12 weeks.
Stage 6 - Handover and title transfer. The remaining 15-30% is paid at this point. The formal title transfer takes place at the Land Office. Up until this moment the buyer's exposure is at its peak - typically 70-85% of the contract price paid without holding formal title.
Scenario A - established developer, Phuket
A developer with a portfolio of five or more completed projects in districts such as Bang Tao or Surin. The payment schedule is structured more favorably for buyers: a smaller contract-signing tranche (25%), offset by a larger handover payment (30%). Risk is lower, but the discount is also smaller at 15-18%.
Scenario B - first-time developer, Koh Samui
A developer completing their first or second project in Maenam or Lamai. The contract-signing payment is higher (35%), but the off-plan discount can reach 25-30%. Risk is substantially elevated: no track record, potential permitting issues (EIA requirements for sites near the coastline), and uncertain cash-flow management.
Scenario C - luxury project with rental guarantee
A guaranteed rental return of 5-7% per annum for 3-5 years is marketed alongside the off-plan discount (20-25%). In our analysis, once property management fees (20-30% of rental revenue) and the one-time sinking fund contribution (approximately 500-800 THB per sq m) are accounted for, the net yield compresses to 3-4.5% annually. The headline discount figure is less meaningful in this context than the net cash-flow projection.
Comparison table
| Parameter | Scenario A - established developer | Scenario B - first-time developer | Scenario C - rental guarantee project |
|---|---|---|---|
| Location | Bang Tao / Surin (Phuket) | Maenam / Lamai (Koh Samui) | Kamala / Bophut |
| Off-plan discount | 15-18% | 25-30% | 20-25% |
| Contract-signing payment | 25% | 35% | 30% |
| Handover payment | 30% | 15% | 20% |
| Build period | 18-24 months | 24-30 months | 20-26 months |
| Delay penalty | 0.01-0.05% per day | Often absent or nominal | 0.01-0.03% per day |
| Withdrawal right | After 90-120 days overrun | After 180 days or absent | After 120-150 days |
| Non-completion risk | Low | Moderate to high | Low to moderate |
| Net ROI (per our estimates) | 6-9% (capital appreciation) | 8-14% (appreciation, higher risk) | 3-4.5% (net rental guarantee) |
Risks and mistakes
EIA clearance and permitting risk
An Environmental Impact Assessment is mandatory for projects exceeding 80 residential units or located within protected zones. In Phuket, particularly in the Nai Harn and Rawai areas, the EIA process can halt construction for 6-18 months. We verify on the ground whether a developer has secured full EIA approval before launching off-plan sales. If approval is still pending at the point of sale, that is a material warning signal.
Cash-flow risk during structural construction
The most frequent cause of delays at the structural stage is developer cash-flow stress. Without an escrow mechanism, buyer installments flow directly into the developer's operating accounts. Based on our estimates, approximately 10-15% of off-plan projects on Koh Samui experience construction delays exceeding three months.
Specification substitution risk at fit-out stage
Imported materials and unilateral specification changes are the two primary sources of finishing-stage delays. We monitor cases where developers substituted lower-cost finishes without consulting buyers. The only contractual protection is a detailed materials and brands schedule attached to the sale and purchase agreement (sometimes called an 'attachment' or 'schedule to the contract'). Without it, the buyer has no enforceable recourse on specification.
Handover and snagging risk
A snag list (defects schedule) after handover inspection is the norm, not the exception. The problem arises when the developer demands full final payment before rectifying identified defects. In a properly drafted agreement, a retention amount of approximately 5% of contract value should be withheld until agreed defects are remedied.
Common structural and legal mistakes by buyers
- Signing a contract in English only without having key clauses independently reviewed by a Thai property lawyer
- Failing to verify the land title type: Chanote (Nor Sor 4 Jor) is the only title that provides full legal protection; Nor Sor Sam Kor carries meaningful limitations
- Skipping developer analysis: completed project history, corporate structure (Thai company vs. joint venture), and outstanding debt obligations
- Transferring more than 50% of the purchase price before structural completion, which increases buyer exposure disproportionately to actual construction progress
- Underestimating transfer costs: transfer fee (2% of assessed value), specific business tax (3.3%) or withholding tax (1% for companies), and property management commission
The discount arithmetic - a worked example
A 45 sq m condominium in Bang Tao, off-plan price: 4,200,000 THB. A comparable resale unit in the same sub-district: 5,200,000 THB. Nominal discount: approximately 19%. With a 24-month payment schedule and an opportunity cost of capital at 5% per annum (reflecting a conservative liquid savings benchmark), the real discount - after accounting for the time value of locked-up funds - narrows to approximately 14-16%. Still positive, but not as dramatic as developer marketing materials typically suggest.
For buyers who are tax residents of countries with a double taxation agreement with Thailand, the timing of taxable events matters. Capital gains from Thai property sales may be taxable in both Thailand and the buyer's country of residence, depending on treaty terms. Based on our analysis, the effective tax rate on a sale after five years of ownership in Thailand runs at approximately 3-7%, depending on the Land Office assessed value and the holding period calculation method.
FAQ
Is buying off-plan in Thailand safe for a foreign buyer?
Safety depends on three factors: developer credibility, the quality of the sale and purchase agreement, and the land title type underlying the project. There are no escrow accounts for foreign property buyers in Thailand, so contractual clauses are the primary protection for installment payments. We recommend verifying at least three completed projects from any developer before committing.
What is the typical reservation deposit for an off-plan purchase in Phuket?
Reservation deposits range from 50,000 to 200,000 THB, credited against the final purchase price at contract signing. The median figure in our data sets is approximately 100,000 THB.
What discount does off-plan typically offer versus the resale market?
In Phuket (Bang Tao, Layan, Kamala) the indicative discount is 15-25% relative to comparable resale units. In Koh Samui (Bophut, Maenam) the range is 12-30%. Both figures reflect Q1 2026 data from our monitoring of active projects on both islands.
What happens if a developer delays construction?
In a well-structured contract, the buyer is entitled to a contractual penalty (0.01-0.05% of contract value per day of delay) and the right to rescind the contract and receive a full refund after a defined overrun threshold (typically 90-180 days). Without these clauses, the buyer's only recourse is litigation in Thai courts, which routinely takes 2-5 years.
Can I resell an off-plan unit before the project is completed?
Most sale and purchase agreements in Phuket and Koh Samui permit assignment of contractual rights to a third party. Developers typically charge an assignment fee of 1-3% of the contract value. We verify on the ground whether an assignment clause is present before recommending a project - its absence effectively eliminates the option to exit the investment before handover.
What additional costs should an off-plan buyer budget for?
The main items are: sinking fund (one-time, approximately 500-800 THB per sq m); transfer fee (typically split 50/50 with the developer, totaling around 2% of assessed value); advance common area maintenance (1-2 years upfront at 40-100 THB per sq m per month); and utility connection fees (water, electricity). In aggregate, buyers should budget an additional 3.5-6% above the contract price.
How do we verify a developer's credibility in Thailand?
Our analysts cross-reference three sources: the corporate registry at the Department of Business Development (DBD), on-site visits to completed projects with reviews from existing owners, and analysis of the developer company's financial statements where available. Monitoring active construction sites on both islands allows us to identify projects showing early signs of financial stress.
Can a foreign buyer purchase an off-plan villa in Thailand?
Foreigners cannot own land in Thailand. Off-plan villas are typically offered under a leasehold structure (30-year lease, commonly renewable for additional 30-year terms) or via a Thai company. Each structure has distinct legal and tax implications and should be reviewed by a qualified Thai property lawyer. For condominiums, a foreign buyer can hold freehold title provided the foreign-owned quota does not exceed 49% of the total sellable floor area in the building.
How does an international bank transfer work for a Thai property purchase?
Funds must be remitted from abroad in a foreign currency (most commonly USD or EUR) and converted to THB through a Thai bank. The bank issues a Foreign Exchange Transaction Form (FETF, also known as Thor Tor 3), which is required documentation for registering ownership at the Land Office. International SWIFT transfers typically settle within 2-4 business days; currency conversion spread at Thai banks is approximately 0.3-0.8% depending on the institution and transaction size.
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