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Work +66 2 646 1888
Fax +66 2 646 1919
Bangkok, Vientiane, Yangon
Siam Premier International Law Office Limited, Techatat Udomsiri, Bangkok, THAILAND

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Techatat Udomsiri

Work +66 2646 1888 ext: 1006
Siam Premier International Law Office Limited

Work Department

Partner – LLB (1st Class Honours), Barrister-at-Law, MBA


Specialises in: Litigation & Dispute Resolution


As a partner of Siam Premier, Techatat Udomsiri’s special area of practice is litigation & dispute resolution. He practices in various areas of civil and commercial litigation, criminal law, labour relations litigation, bankruptcy and arbitration. Techatat’s work in the past and present for leading international and Thai banks such as Bank of America, European Asian Bank, Bangkok Bank, Banque Paribas, United Overseas Bank (UOB), Overseas Union Bank (OUB), Sumitomo and Sakura Bank, Oversea Chinese Banking Corporation (OCBC) and International Finance Corporation (IFC) of World Bank, includes acting in debt recovery claims under loan and security documents and restructuring and insolvency cases. Techatat has also acted for companies including Siam Cement Group, Harrods, Seiko and Planet Hollywood in intellectual property claims and dispute resolution procedures. He also has extensive experience in international trade disputes and contractual claims by representing Mitsui & Co., Mitsui (Thailand) Co., Ltd., Banpu Plc., Asia Partnership Fund, Caltex Oil (Thailand) Ltd., Asia Pacific Breweries Singapore Pte Ltd., etc., arbitration proceedings and enforcements by representing Thai Plastic and Chemicals Plc. (TPC), labour disputes by representing Qantas Airways, Dusit Thani Hotel, Amway (Thailand), Dao Chemical (Thailand), etc. Recently Techatat has been involved in representing Mitsubishi Electric Corp. in litigation surrounding breach of contract during the construction of Blueline Underground. Regarding the criminal cases, he has handled various cases for many local and foreign clients (natural and juristic persons).


He was admitted as a Barrister-at-Law in 1979 and is a member of the Thai Bar Association and the Lawyers Council of Thailand.


Dispute resolution

Within: Dispute resolution

Siam Premier International Law Office Limited has actively invested in its dispute resolution team, which is now one of the largest departments at the firm. It has built a reputation acting for corporates in insurance, construction, government projects and employment litigation. In one of the group’s standout matters, department co-head Kong Suriyamontol successfully represented NVPSKG Joint Venture in two claims against the Pollution Control Department regarding payment for construction of the Samut Prakarn Wastewater Management Project. Suriyamontol also acted for Green Architecture and Engineering Company as claimant in construction arbitration proceedings. Techatat Udomsiri jointly heads the practice group and is defending the world’s largest fully integrated natural rubber company, Sri Trang Argo-Industry, in civil and criminal proceedings for alleged fraud. Managing partner Phisud Dejakaisaya has extensive experience in banking, investment and commercial litigation and is acting for Thai Takasago Company in the Central Administrative Court in a case concerning the unlawful termination of a construction contract. Rawat Chomsri, Noppramart Thammateeradaycho and Chakrapong Boonchan are other notable contacts in the department.

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