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An incomplete construction contract is behind almost every dispute. This page explains what a workable contract must contain and how each clause should be written so both homeowner and contractor are equally protected
State the full names, ID card or company registration numbers, registered addresses and phone numbers of both parties, plus the site location down to the title deed number. It looks like a formality, but if it ever goes to court, a contract that doesn't clearly identify the people is the hardest to enforce
Attach the construction drawings and bill of quantities (BOQ) as annexes, and state in the contract that the annexes form part of it. Spell out what work is "not included" in this price, e.g. land filling, fencing, electricity and water meters — most disputes come from "I thought it was included"
State the total price in figures and words, whether it includes VAT, and who pays for materials, labor, transport and water/electricity during construction. For a contract including materials, specify the brand or grade of the main materials, not just "standard materials"
Split milestones by actual progress, not time, and state clearly what must be done for each milestone to count as complete. The safe principle is that the value of completed work should always be ahead of the money paid. A first deposit is typically around 10–15% of the contract; if asked for more than 30% before the piles go in, ask questions
State the start and completion dates as real dates, with a daily penalty rate for late handover, and list the grounds for extensions, e.g. continuous rain, owner-ordered design changes, or late handover of the site. Contracts with penalties but no extension grounds usually end with the penalty being dropped because the argument never ends
Usually 5% of each milestone is retained and returned when the warranty period ends. General work is usually warranted for 1 year, structural work often longer. State clearly what the warranty covers and what it doesn't, such as damage from misuse
State the grounds on which each party may terminate, and how money is settled if it ends midway: how completed work will be valued and who owns materials stockpiled on site. Nobody wants to use this clause, but it's the one that saves you when you really need it
Enter the project details and the system drafts every clause for you. Edit the text freely and print to PDF or send via LINE right away
A contract for work requires stamp duty of 1 baht per 1,000 baht of the contract price; under the Revenue Code, the contractor is the party responsible for paying it
Legally yes — a contract for work doesn't have to be in writing — but if a dispute arises, the agreement is very hard to prove, so always put it in writing
In practice usually 10–15% of the contract, tied to visible work. The key principle is that the value of completed work should always be ahead of the money paid
Usually 5% of each milestone, returned when the warranty period ends — typically 1 year from handover for general work
This page is general information for basic understanding, not legal or tax advice. The figures, rates and conditions mentioned are those commonly used in the market and may differ from your case; check with a professional or the relevant authority before using them for real work