Most contractors in Thailand tend to work below standard, and unfortunately, there is no strict regulatory body that consistently monitors construction quality. When disputes occur between homeowners and contractors, most cases end up in court — where judges typically try to mediate rather than issue strong penalties.
Even when the homeowner wins the case, the compensation is usually very small and rarely worth the time, stress, or legal expenses. If the construction contract is not written clearly, many homeowners actually end up losing the case despite being the wronged party, while irresponsible contractors often face no real consequences.
Large and well-known construction companies are not always the solution either. Their prices can be extremely inflated, and surprisingly, several big-name companies in Thailand have been involved in major fraud cases in recent years, with damages reaching hundreds of millions of baht.
For foreigners planning to build a house or any type of property in Thailand, I strongly recommend hiring construction supervision to oversee the contractor’s work.
Thailand does have professional construction consultants — licensed engineers and architects — who can properly supervise and manage the construction process to ensure it meets engineering standards. Their fees are not expensive at all, typically around 2,500 THB per visit.
I can personally recommend a reputable consultancy:
wisawa construction supervision in thailand > https://wisawa.co.th/en/construction-supervision/