Based on data we monitor on the ground, infrastructure projects under way in Phuket and Koh Samui in 2026 are directly influencing property price dynamics within a 5-15 km radius of each development. Over the past 24 months, land prices in the Layan and Bang Tao corridor have risen by an estimated 18-25%, with the expansion of the road network connecting the island's west coast to the airport cited as one of the primary drivers in our data sets.
Price-transmission analysis matters for any investor weighing a condominium or villa purchase on either island. Not every announced project translates into measurable value uplift - a number of schemes have remained at the concept stage for years. Below we set out the verified status of seven significant infrastructure projects and their quantifiable impact on the market.
Quick answer
- Phuket International Airport (HKT) expansion - new terminal targeting 12.5 million passengers per year - scheduled completion 2027; as of 2026, construction is approximately 60% complete
- Kathu-Patong Tunnel (Patong Bypass Tunnel) - government-approved with state funding of 14.6 billion THB (roughly USD 400 million per market estimates); projected handover pushed to 2028-2029
- Ao Po Grand Marina on Phuket's east coast - ongoing expansion and pier upgrade; we estimate a 8-12% price uplift within a 10 km radius over a 3-year horizon
- Koh Samui - international-grade private hospital in Chaweng Noi - opening scheduled for Q3 2026; privately financed
- New IB-curriculum international school in Bophut (Koh Samui) - set to open for the 2026/2027 academic year
- Route 4027 expressway on Phuket (Thalang-Layan section) - widening to four lanes; construction progress as of 2026 stands at roughly 75%
- Maenam Yacht Harbour (Koh Samui) - concept stage only, no approved budget; we treat this purely as a planning signal
Options and scenarios
Scenario A: on-schedule delivery of flagship projects
If the Kathu-Patong Tunnel and the new HKT terminal are delivered as planned (2028-2029 and 2027 respectively), our analysts project a further 15-20% rise in condominium prices across Kamala, Patong and Kathu within three years of each opening. Cutting the drive from the airport to Kamala from the current 55-70 minutes down to an estimated 25-35 minutes would represent a structural shift in short-term rental appeal for that coastline.
For a buyer acquiring a unit priced at 4-6 million THB (approximately USD 110,000-165,000 at Q1 2026 exchange rates), that translates into a potential capital gain of 700,000-1.4 million THB over a 2027-2030 horizon, based on our estimates.
Scenario B: delays of two to three years
Phuket's infrastructure history shows delays are the norm rather than the exception. The island's Light Rail Transit (LRT) project has been announced since 2017 and, as of 2026, has not broken ground. In this scenario, price growth across the impact zones slows to an estimated 5-8% per year rather than 15-20% cumulatively. Capital is preserved, but the return profile weakens relative to comparable alternative allocations.
Scenario C: non-delivery and the 'paper infrastructure' risk
Some announcements - the Maenam marina and the Phuket LRT among them - may never advance beyond the concept phase. In our data sets, locations where investors purchased solely on the strength of an infrastructure promise, and where that project was subsequently cancelled, recorded price corrections of 5-10% within 12 months of the official suspension announcement.
Comparison table
| Parameter | HKT Airport - New Terminal | Kathu-Patong Tunnel | Chaweng Noi Hospital (Koh Samui) | Ao Po Grand Marina (Phuket) |
|---|---|---|---|---|
| Status (2026) | Under construction - approx. 60% | Approved, tender stage | Under construction - near completion | Upgrade in progress |
| Funding | Government (AOT) | Government (Dept. of Highways) | Private | Private |
| Estimated cost | 5.7 billion THB | 14.6 billion THB | 1.2 billion THB | 800 million THB |
| Target completion | 2027 | 2028-2029 | Q3 2026 | Q4 2026 |
| Districts in impact zone | Thalang, Mai Khao, Nai Yang | Kamala, Patong, Kathu | Chaweng Noi, Lamai | Ao Po, Pa Khlok, Cape Yamu |
| Estimated price impact (3 years) | +10-15% | +15-20% | +8-12% | +8-12% |
| Delay risk | Medium | High | Low | Medium |
Risks and mistakes
Buying the promise rather than the concrete. This is the most frequent error we observe. The Phuket LRT is a textbook case - announced in 2017, repeatedly postponed, and as of 2026 still without a construction start date. Developer marketing materials near proposed LRT stations were using 'close to the future light rail' as a selling point as early as 2019. Units in those locations have shown no measurable price premium over their district averages.
Overestimating the impact radius. Infrastructure raises prices within a specific perimeter. Based on our estimates, the price effect is strongest within 5 km of a project and decays logarithmically beyond that. A property 15 km from the new tunnel will not register a statistically meaningful benefit.
Expropriation and alignment changes. Bypass roads and expressways require land acquisition. We monitor cases where road alignments shifted by several hundred metres during the design phase, materially changing noise exposure and view corridors for neighbouring properties.
Currency risk on THB-denominated assets. Foreign buyers holding Thai baht-denominated property carry exchange-rate exposure. From 2023 through Q1 2026, the Thai baht strengthened by approximately 8% against the Polish zloty - and has shown similar movement against several other European currencies - increasing the effective acquisition cost in home-currency terms.
Absence of deposit protection mechanisms. Pre-sale payments during construction are not protected by a statutory scheme comparable to those in the EU. We verify developer credibility, track records and regulatory permits (EIA approval, construction permit) on the ground before any recommendation is issued.
FAQ
How do infrastructure projects affect property prices in Phuket in 2026?
Major projects such as the HKT airport expansion and the Kathu-Patong Tunnel lift property values within a 5-15 km radius. Based on our estimates, the uplift ranges from 8% to 20% over a three-year period following project completion.
Is the Kathu-Patong Tunnel already under construction?
As of 2026, the project is government-approved with a budget of 14.6 billion THB. It is currently in the tender phase. Physical construction has not started. The target handover date is 2028-2029, though we are actively monitoring the risk of further slippage.
When will the new Phuket Airport terminal open?
The new international terminal at HKT is designed to raise annual capacity to 12.5 million passengers. Construction is approximately 60% complete as of 2026, with a planned opening in 2027. The project is funded by Airports of Thailand (AOT).
Which Phuket districts stand to gain most from the new infrastructure?
Our analysts anticipate the strongest price growth in Kamala, Kathu and Patong (within the tunnel's impact corridor) and in Thalang and Mai Khao (within the airport expansion zone). On the east coast, the Ao Po and Cape Yamu area benefits from the marina upgrade.
Is Koh Samui worth considering from an infrastructure investment perspective?
Koh Samui's development is more gradual than Phuket's, but specific catalysts are emerging. The private hospital in Chaweng Noi and the international school in Bophut raise the island's appeal for families and long-stay residents. We estimate a price impact of 8-12% in those districts over three years. The Maenam yacht harbour remains a concept at this stage and should not be priced in.
Does the Phuket LRT project influence property prices?
Not in any measurable way. The LRT scheme has been on the agenda since 2017 and, as of 2026, has not progressed beyond the planning phase. We do not recommend treating it as a price-forming factor in current investment decisions.
How far from an infrastructure project does the price uplift reach?
Based on our estimates, the price effect is strongest within 5 km of the project. In the 5-10 km band it roughly halves. Beyond 15 km the impact is statistically negligible.
How should buyers categorise infrastructure projects before purchasing?
We apply a three-tier classification: projects under active construction with confirmed funding; approved projects with an allocated budget but no groundbreaking yet; and concept-stage proposals with no committed budget. Only the first category justifies paying a location premium at the time of purchase.
Will the airport expansion increase flight connectivity to Phuket?
Terminal capacity alone does not directly reduce ticket prices, but raising throughput to 12.5 million passengers per year attracts additional carriers. Since the 2025/2026 season our analysts have monitored a growing number of charter connections from European hubs, which indirectly supports short-term rental demand in the surrounding districts.
Researching property in Phuket or Koh Samui? Get in touch - our analysts will prepare a data brief for your shortlisted location.