As of 2026, Phuket is running more than a dozen concurrent road infrastructure projects with a combined budget exceeding 35 billion THB (roughly 1 billion USD at current exchange rates). Our analysts monitor construction progress on the ground and track how each new corridor shifts the island's property price map. This briefing covers the four projects we consider most consequential for residential real estate.
Quick answer
- Patong Tunnel (Kathu to Patong): approximately 3.9 km, budget around 14.6 billion THB, status as of 2026 is procurement/tendering phase following EIA approval, earliest realistic opening is 2029-2030
- Route 4027 widening (Thalang to Kamala): expansion to four lanes over 18 km, budget approximately 4.2 billion THB, active construction underway, targeted completion late 2027 to early 2028
- Eastern Bypass (Koh Kaew to Chalong): currently at feasibility-study stage, estimated budget 8-10 billion THB, realistic delivery after 2028
- Chalong Circle Underpass: completed and opened in 2025; in our data sets, land prices within a 2 km radius have risen approximately 12-15% year-on-year since opening, based on our Q4 2025 listing-price monitoring
- Phuket Light Rail Transit (LRT): airport-to-Chalong corridor of roughly 42 km, budget approximately 35 billion THB, government-approved as of 2026 but no construction contract signed and no tender awarded
- Based on our estimates, districts in the direct influence zone of active projects (Kamala, Kathu, Koh Kaew) currently command a price premium of 8-18% over comparable districts outside the infrastructure pipeline
Options and scenarios
Scenario A - delivery on schedule
If the Patong Tunnel and the Route 4027 widening are completed within their declared timelines (2029 and late 2027/early 2028 respectively), we expect the strongest price appreciation in Kamala and Kathu. The Chalong Circle Underpass provides a useful local benchmark: land prices in Chalong rose approximately 12-15% in the twelve months following its opening, per our listing-data monitoring through Q4 2025. We expect an analogous mechanism to play out in Kamala, where the median condominium price currently sits at approximately 120,000-140,000 THB per sq m. Once the Route 4027 widening is complete and tunnel access improves, that range may converge toward Surin levels (150,000-170,000 THB per sq m).
Scenario B - delays of two to three years (our base case)
This is the scenario we use as our central assumption in pricing models. Large infrastructure projects in Thailand have averaged a 2.1-year delay relative to original schedules, based on Thai State Audit Office records for 2015-2024. Under this scenario, the Patong Tunnel opens no earlier than 2031 and the Eastern Bypass remains at planning stage through 2030. The price premium we attribute to Kamala and northern Kathu under this scenario is a more modest 5-8%, because a portion of the infrastructure promise was already priced into the market during 2024-2025.
Scenario C - partial delivery or project cancellation
The highest cancellation risk attaches to the LRT and the Eastern Bypass. The Phuket LRT has been announced repeatedly since 2017 and no ground has been broken as of mid-2026. The Eastern Bypass has no signed construction contract. If these projects stall, Koh Kaew and Rassada will not receive the anticipated price impulse. In this scenario, our analytical recommendation shifts toward districts that already benefit from functioning infrastructure: Bang Tao, Layan, and Cherng Talay, where road capacity is not contingent on future government delivery.
Comparison table
| Parameter | Patong Tunnel | Route 4027 Widening | Eastern Bypass | Phuket LRT |
|---|---|---|---|---|
| Route length | approx. 3.9 km | approx. 18 km | approx. 22 km (estimated) | approx. 42 km |
| Budget (THB) | 14.6 billion | 4.2 billion | 8-10 billion (estimated) | approx. 35 billion |
| Stage as of 2026 | Tendering phase | Active construction | Feasibility study | Approved, pre-tender |
| Planned opening | 2029 (optimistic) | Late 2027/early 2028 | After 2028 | After 2030 |
| Funding mechanism | State budget | State budget | State budget plus PPP (concept) | State budget |
| Districts in influence zone | Kathu, Patong | Kamala, Surin, Thalang | Koh Kaew, Rassada, Chalong | Airport to Chalong corridor |
| Estimated price impact (12 months post-opening) | +15-20% in Kathu | +10-15% in Kamala | +8-12% in Koh Kaew | +10-25% along corridor |
| Delivery confidence (our assessment) | High | Very high | Medium | Low to medium |
Risks and mistakes
Paying for a promise rather than poured concrete. The most common analytical error we observe in Phuket acquisition decisions is absorbing an infrastructure premium before the infrastructure exists. We have tracked this pattern for years. The Phuket LRT was described as 'approved' as early as 2019. As of 2026, not a single pile has been driven. Developers in Koh Kaew and Rassada were already quoting prices 10-15% above comparable stock in 2020, citing the planned LRT. Buyers who entered at that point have been waiting six years for the catalyst.
Compulsory acquisition exposure. Road-widening projects require land acquisition from private owners. The Route 4027 process has been running since 2023 and continues to generate delays. We verify on the ground whether any parcel under client review sits within the planned right-of-way. This is a non-negotiable step in due diligence for any plot near an active widening scheme.
Political cycle risk. Infrastructure priorities in Thailand are sensitive to government transitions. Budget allocations can shift after elections. The Eastern Bypass and the LRT both lack signed construction contracts, which makes them vulnerable to de-prioritisation under a future administration.
Currency exposure for international buyers. Buyers settling in currencies other than THB face exchange-rate risk that can partially offset property appreciation gains. We flag this in all our return-on-investment calculations and recommend buyers model a range of currency scenarios alongside the property price scenario.
Overestimating road impact on condominiums. New road access has a stronger and faster effect on land and villa pricing than on condominium pricing. Condominium values are more closely correlated with beachfront distance and developer brand than with road connectivity. In our data sets we separate these two segments rather than applying a uniform infrastructure multiplier.
FAQ
What new roads are under construction in Phuket in 2026?
As of 2026, the Route 4027 widening between Thalang and Kamala is in active construction. The Patong Tunnel is in the tendering phase following EIA approval. The Eastern Bypass (Koh Kaew to Chalong) is at feasibility-study stage. The LRT is government-approved but has not entered procurement.
When will the Patong Tunnel open?
The official optimistic target is 2029. Based on our estimates and Thailand's historical infrastructure delay average of 2.1 years, we treat 2030-2031 as the realistic opening window.
How do new roads affect property prices in Phuket?
Historically, opening new road infrastructure in Phuket has translated into price increases of 10-20% within a 2-5 km radius over the twelve months following completion. The effect is stronger for land and villa segments than for condominiums.
Which Phuket districts benefit most from the 2026 infrastructure pipeline?
Based on our current assessments, Kamala stands to gain the most from the Route 4027 widening, Kathu from the Patong Tunnel, and Koh Kaew from the Eastern Bypass (conditional on that project proceeding). Bang Tao, Layan, and Surin already have well-established road access; their infrastructure premium is largely priced in.
Is it worth buying property near a planned road in Phuket?
We recommend caution. Our pricing models apply an explicit discount to infrastructure that is not yet under active construction: projects in active construction (10-20% discount applied), approved but pre-tender (40-60% discount), and feasibility or concept stage (70-90% discount). Paying full 'infrastructure premium' before a contract is signed carries material risk.
What is the current condominium price per sq m in Kamala in 2026?
The median condominium price in Kamala is approximately 120,000-140,000 THB per sq m as of 2026, per our market monitoring. If the Route 4027 widening completes on schedule, we expect gradual convergence toward Surin price levels (150,000-170,000 THB per sq m).
Will the Phuket LRT be built?
The project is government-approved, but as of mid-2026 there is no signed construction contract and no awarded tender. The LRT has been announced multiple times since 2017. We classify it as uncertain in our models and do not recommend paying a price premium based on its anticipated existence.
Where can buyers verify the official road project maps for Phuket?
The Thailand Department of Highways (doh.go.th) and the Phuket Provincial Office publish official maps of planned road investments. We monitor these sources on a quarterly basis and update our district-level assessments accordingly.
How does road infrastructure affect short-term rental yields in Phuket?
Improved airport access correlates directly with guest ratings and occupancy rates for short-term rental properties. Based on our estimates, properties in districts reachable from Phuket Airport within 30 minutes achieve daily rates approximately 15-25% above comparable properties in locations requiring more than 60 minutes of travel time.
Our core analytical recommendation for 2026 is to distinguish clearly between infrastructure that is certain (active construction with a signed contract) and infrastructure that is declared (pre-tender or conceptual). Among the four projects covered here, only the Route 4027 widening is in active build phase. Kamala and the northern part of Kathu therefore represent the most analytically defensible locations for investors seeking an infrastructure premium with limited delay risk. We update our construction-progress assessments and district price models on a quarterly basis.
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