Educational Information Only
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Operating as Unlicensed Contractor in Thailand
Performing controlled construction work without proper professional licensing
Professional Engineering Act B.E. 2505 (1962) §45, Architect Act B.E. 2543 (2000) §49
Fine up to THB 50,000 and/or imprisonment up to 3 years
moderate
Definition
Performing controlled construction work without proper professional licensing Under Thai law, this offence is classified as a moderate offence within the category of construction.
Legal Basis
Professional Engineering Act B.E. 2505 (1962) §45
Primary legislative provision for operating as unlicensed contractor offences.
Architect Act B.E. 2543 (2000) §49
Primary legislative provision for operating as unlicensed contractor offences.
Elements of the Offence
For a conviction, the prosecution must prove all of the following elements beyond reasonable doubt:
Performing engineering work without license
Designing buildings without architect license
Using unlicensed professionals for controlled work
Penalties
Maximum Penalty
Fine up to THB 50,000 and/or imprisonment up to 3 years
Actual sentences depend on factors including the severity of the conduct, harm caused, prior convictions, and mitigating circumstances. Courts have discretion to impose lesser sentences within the statutory range.
Possible Defences
The following defences may be available depending on the circumstances:
Work below controlled threshold
Supervision by licensed professional
Note: The availability of defences depends on specific facts. Professional legal advice is essential.
For Foreigners
Special Considerations for Foreign Nationals
Foreign engineers/architects must obtain Thai professional licenses to practice.
When Legal Representation Matters
If you are accused of operating as unlicensed contractor or facing investigation, immediate legal representation is essential to protect your rights and build an effective defence.
Anglo Siam Legal provides experienced legal services across Thailand for both Thai nationals and foreigners.
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