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Road subsidence in Pattaya was found in some sections of Sukhumvit Road after underground drainage pipes were laid. Following excavation work and soil compaction, individual stretches of the road surface became uneven and damaged. As The Pattaya News reported on November 10, 2026, Deputy Mayor Manoch Nongyai said the repairs were being sped up. The city is now surveying the ground under the road and along the drainage pipes, engineers plan to strengthen the base with cement grout, and only after that is the asphalt to be restored with the involvement of a contractor. Current as of publication: about three months is only a preliminary estimate of the contract’s duration for the work, not a confirmed date for the final completion of the repairs or the reopening of all lanes to traffic.
What Is Known
Deputy Mayor Manoch Nongyai said that after the drainage pipes were installed, subsidence was found under several sections of the main road. According to local media, city services are surveying the condition of the soil under the roadbed and along the laid pipes to determine the cause of the surface deformation.
Earlier, the authorities allocated a budget for resurfacing the road, but replacing the top layer is not enough if the base keeps sinking. Without addressing the cause, the new asphalt may be damaged again, which would require repeated repairs and spending. General recommendations for drivers are collected in the article on road safety in Thailand.
The topic of drainage is also covered in an official department report on flooding. This material on flooding does not confirm the repair timeline or the condition of specific sections of Sukhumvit Road.
Road Subsidence in Pattaya: Where and Why Sukhumvit Was Affected
According to a report by the Thai outlet Siamrath, damage was noted between the Phothisan area and Sawang Fah. These are reference points along the main road, not a published diagram of closed lanes or the exact location of each subsidence.
The underground pipes were laid to carry water away from the Nong Yai Intersection in North Pattaya to the Na Kluea Canal. After excavation and soil compaction, some sections of the surface became uneven and damaged. This is a description by the reporters, citing city announcements, not a published technical assessment by the municipality.
How the Base Is Planned to Be Reinforced and How Long Repairs Will Take
According to The Pattaya News, engineers are checking the soil and the placement of the drainage pipes. The next planned step is injecting cement grout to stabilize the base, after which the contractor can begin the repairs. Resurfacing from North Pattaya to Sawang Fah is planned after the soil is strengthened, not instead of it.
About three months — the approximate contract duration, as reported by the media. This is not a confirmed date for completing the paving or opening all lanes. The start of cement injections, signing of the contract, and a detailed work schedule have not yet been confirmed.
If you use city transport, a general overview of routes is available in the article on transport in Pattaya. It does not replace up-to-date information on possible restrictions on the main road itself.
What to Do
Drivers, passengers, and residents along Sukhumvit Road are advised to check the latest City Hall announcements before traveling and to follow road signs on site. Details about the work and possible restrictions can be checked through the Pattaya contact center 1337, listed on the official Pattaya municipal service.
There are no confirmed dates for lane closures, road work hours, or an official detour plan in the available reports. Therefore, unconfirmed alternative routes should not be taken as approved by the city.
The information is current as of the report of November 10, 2026. The order and timing of the work may change; before traveling, check the latest announcements from city services.