In Q1 2026, our analysts estimate the average price per square metre for a new off-plan villa in Maenam, on Koh Samui's northern coast, at 85,000-120,000 THB. Comparable completed villas on the secondary market in the same district are priced at 110,000-155,000 THB/m². That gap of roughly 20-30% is the core arithmetic of off-plan investing in Maenam, but it comes attached to 18-30 months of construction-phase exposure. This briefing unpacks the payment mechanics, quantifies the risks at each milestone, and benchmarks Maenam against other Koh Samui districts.
Maenam occupies a wide, low-density stretch of northern Koh Samui with a flat beachfront and relatively relaxed zoning. We currently monitor seven active developers running off-plan villa projects in the district, covering units with 2-4 bedrooms, private pools and plots of 200-600 m². Most of these developers structure payments across 5-7 tranches tied to specific construction milestones. Below we break down that structure in detail.
Quick answer
- Off-plan discount in Maenam vs. the secondary market: approximately 20-30% (as of 2026, per our estimates)
- A typical payment schedule covers 5-7 tranches: reservation, contract signing, foundations, structural completion, finishing works, handover
- The first two payments combined (reservation plus contract signing) represent 30-40% of the total purchase price
- Average construction period in Maenam: 18-24 months; delays of 3-6 months affect a meaningful share of projects
- Thailand has no buyer-protection trust or escrow mechanism for foreign off-plan purchasers; contractual clauses and developer financial standing are the only safeguards
- Based on our estimates, a 3-bedroom off-plan villa in Maenam starts at approximately 8-9 million THB
Options and scenarios
Scenario 1: Standard 6-tranche payment schedule
This is the most common structure we observe among established developers in Maenam. The sequence runs as follows:
- Reservation - 100,000-300,000 THB (a fixed sum, roughly 1-3% of the price). Paid at the point of signing the reservation document. Non-refundable in most contracts.
- Contract signing - 25-35% of the price, minus the reservation amount. Due within 14-30 days of reservation.
- Foundation completion - 15-20%. Triggered approximately 3-5 months after contract signing.
- Structural completion - 15-20%. Triggered approximately 8-12 months after construction start.
- Finishing works - 10-15%. Triggered at 14-18 months.
- Handover - 10-15%. Released after a satisfactory technical inspection.
Under this model, a buyer has committed roughly 45-55% of total capital by the six-month mark, when the villa is still at foundation level. This is the critical risk window: financial exposure accelerates faster than visible construction progress.
Scenario 2: Low upfront entry schedule
A subset of smaller Maenam developers offers a reduced initial payment (15-20% at contract signing) offset by a larger tranche at structural completion (25-30%). This lowers the entry barrier but concentrates risk in the mid-construction phase, precisely when monitoring access is most limited.
Scenario 3: Secondary market purchase
The direct alternative is a completed villa, typically 1-3 years old. The price premium of 20-30% eliminates construction risk, delay risk and developer solvency risk. Payment flows in two steps: a 10% deposit followed by the balance at title transfer through the Land Office. No construction milestones, no phased exposure.
Comparison table
| Parameter | Off-plan (6 tranches) | Off-plan (low upfront) | Secondary market |
|---|---|---|---|
| Indicative price per m² (THB) | 85,000-120,000 | 80,000-110,000 | 110,000-155,000 |
| Payment at contract (% of price) | 30-40% | 15-20% | 10% deposit |
| Time to possession | 18-24 months | 18-24 months | Immediate |
| Capital exposure at 6 months | 45-55% | 35-45% | 100% |
| Discount vs. secondary market | 20-30% | 25-35% | 0% (reference point) |
| Construction risk | Medium to high | Medium to high | None |
| Customisation during build | Yes (design phase) | Yes (design phase) | Minimal |
| Payment protection mechanism | Contract terms plus developer track record | Contract terms plus developer track record | Title transfer at Land Office |
Risks and mistakes
EIA and permit delays at the foundation stage
Several plots in Maenam fall within zones that require an Environmental Impact Assessment before a construction permit is issued. Based on our on-the-ground monitoring, administrative processing of EIA submissions adds 2-6 months to project timelines, independent of developer intent. The critical contractual protection here is an explicit right of withdrawal with full refund of paid instalments if the developer fails to obtain a construction permit within a defined window, typically 90-120 days from contract signing.
Capital exposure at structural completion
At the structural completion milestone, a buyer typically has 45-60% of total capital committed to a property that cannot yet be occupied or independently valued on the open market. Our field observations from Q4 2025 indicate that delays of 2-4 months at this stage affect approximately 40% of active Maenam projects. Contributing factors include the monsoon season (November to January), supply chain constraints for island logistics and subcontractor turnover.
Three contractual clauses that carry practical weight:
- Liquidated damages for delay - market standard sits at 0.01-0.05% of contract value per day of delay. In absolute terms, these sums are modest and rarely compensate for real financial loss, but their presence signals developer accountability
- Right of staged inspection - the contract should explicitly permit the buyer or a designated representative to inspect the site before each tranche is released
- Completion guarantee - rarely backed by a bank instrument in the Thai market. More commonly, it is a commitment from the developer's project company, so the capitalisation of that entity directly determines the practical value of the guarantee
Finishing and handover defects
Surface-level finishing defects at handover are a market norm rather than a systemic risk. The more material question is whether the contract includes a Defect Liability Period of at least 12-24 months from handover, during which the developer is contractually obliged to remedy identified defects at no cost to the buyer.
Absence of payment protection for foreign buyers
Thailand has no statutory trust or escrow system protecting off-plan payments made by foreign buyers. Instalments are paid directly into the developer's corporate account. The practical safeguards available to a buyer are:
- Contract quality - we recommend that any off-plan sale and purchase agreement is reviewed by an independent lawyer specialising in Thai property law before signing
- Developer track record - completed project history, absence of disputes with subcontractors and verifiable financial stability
- Corporate due diligence - checking the developer's registration with the Department of Business Development (DBD), reviewing registered capital, debt profile and ownership structure
Common mistakes to avoid
- Paying a reservation fee before confirming that a construction permit is in place or applied for
- Signing a contract without a withdrawal clause triggered by delays exceeding 6 months
- Accepting a contract in Thai only, without a certified English translation reviewed by independent counsel
- Skipping due diligence on the land title: encumbrances, right-of-way, land classification and chanote status all require verification
- Transferring any instalment to an individual's personal bank account rather than the developer's registered company account
Discount mechanics: a worked example from Maenam
To ground the numbers, consider a 3-bedroom villa of 180 m² with a pool, located in northern Maenam approximately 800 metres from the beach. Based on our estimates for 2026:
- Off-plan price (pre-launch phase): approximately 16.2 million THB (90,000 THB/m²)
- Comparable completed villa on the secondary market: approximately 21.6 million THB (120,000 THB/m²)
- Nominal discount: 5.4 million THB (25%)
- Opportunity cost of capital locked for 24 months (at a 5% annual alternative return): approximately 810,000 THB
- Real discount after cost of capital: approximately 4.6 million THB (21%)
All figures are indicative and based on our market estimates as of 2026. Actual outcomes depend on the specific project, stage of sales and negotiated terms.
Maenam in the context of other Koh Samui districts
Across our Koh Samui data sets, Maenam consistently offers the most favourable price-to-plot-size ratio on the island. For reference: off-plan villas in Bophut average 95,000-135,000 THB/m², in Chaweng 100,000-140,000 THB/m², and in Lamai 75,000-105,000 THB/m². Maenam's range of 85,000-120,000 THB/m² sits at the mid-point of the island, while generally offering larger plots than Bophut or Chaweng.
On Phuket, comparable off-plan villa projects in Bang Tao and Layan start at 110,000-160,000 THB/m². Based on our data, Phuket commands a price premium of 25-40% over Koh Samui in the villa segment, a differential that partly reflects Phuket's higher tourist volumes and more developed international infrastructure.
FAQ
How much does an off-plan villa in Maenam cost in 2026?
Based on our estimates, a 3-bedroom villa with a pool starts at approximately 8-9 million THB. Price per square metre ranges from 85,000 to 120,000 THB depending on location within Maenam and specification level.
What is the realistic off-plan discount in Maenam compared to ready properties?
We estimate the discount at 20-30% relative to comparable completed villas on the secondary market. The discount is largest at the pre-launch reservation stage and narrows progressively as construction advances.
Are off-plan payments protected by any trust or escrow mechanism in Thailand?
No. Thailand has no statutory mechanism protecting foreign buyers' off-plan instalments. Payments go directly to the developer's account. The practical protections are strong contract drafting and developer due diligence. We recommend independent legal review before signing.
How long does construction take for an off-plan villa in Maenam?
The standard construction period is 18-24 months from contract signing. Based on our field observations from Q4 2025, delays of 3-6 months are common, driven primarily by the monsoon season and island logistics constraints.
What happens if the developer does not complete the project?
A buyer's primary recourse is the contract's withdrawal and refund clauses. Litigation through the Thai courts is available but typically takes 2-5 years. Thorough developer due diligence before any payment is the most effective form of risk mitigation.
What transfer taxes and fees apply at handover?
The standard Transfer Fee is 2% of the official appraised value. Stamp Duty is 0.5%. In many off-plan contracts, these costs are split equally between buyer and developer. Additional costs to budget for include a one-time Sinking Fund contribution and ongoing Common Area maintenance fees in managed projects.
Can a foreign national buy an off-plan villa in Maenam in freehold?
Foreign nationals cannot hold land freehold in Thailand. The two standard structures are a 30-year leasehold (with contractual renewal options) or acquisition through a Thai Company Limited. Each carries different legal and tax characteristics that should be assessed with qualified Thai legal counsel.
How does Maenam compare to Bophut and Lamai for off-plan investment?
Maenam offers lower entry prices than Bophut (95,000-135,000 THB/m²) and Chaweng (100,000-140,000 THB/m²), with larger plot sizes. Lamai (75,000-105,000 THB/m²) is cheaper, but its secondary rental market is thinner. Maenam's combination of beach frontage, plot size and mid-range pricing makes it a frequently benchmarked district in our Koh Samui analysis.
What contract clauses matter most in a Maenam off-plan purchase?
The key provisions are: a right of withdrawal with full refund if the developer misses milestones by more than 6 months; liquidated damages for delay; a Defect Liability Period of at least 12 months from handover; a right to staged on-site inspection before each tranche; and a precise materials and finishes specification schedule.
Researching property in Phuket or Koh Samui? Get in touch - our analysts will prepare a data brief for your shortlisted location.