How to choose a contractor with less risk

Start with your actual conditions: an occupied house, an apartment fit-out or a commercial interior. Access hours, dust control and building coordination vary. Ask for a comparable project and identify exactly which parts the contractor delivered.

Handover photographs show appearance, but not schedule control or aftercare. With permission, speak to a previous client and look at a project that has been in use. Ask what went wrong and how the team responded.

A useful question is: “What was difficult on that project, who decided how to resolve it, and what detail changed?” A specific answer gives you more evidence than an assurance that everything always goes smoothly.

Confirm the legal name, address, contact details and signing authority. For a Thai company, DBD DataWarehouse+ can help verify registration. Registration establishes identity; it does not certify workmanship or delivery capability.

The person selling the project may not supervise it. Identify the coordinator, site lead and specialist teams, including subcontractors. Know who answers questions and who can authorise changes.

Ask for an example progress report: site photographs, decisions awaiting approval and the next work period. A simple, consistent report is more useful than an elaborate system nobody maintains.

Give every bidder the same drawings, specifications and scope. If the design is incomplete, mark provisional items and when they will be confirmed. Different inclusions make headline totals misleading.

Review exclusions such as demolition, disposal, levelling, electrical relocation, waterproofing, fittings and making good. Compare inclusions line by line and ask about blanks instead of assuming.

When prices differ substantially, request an itemised explanation. The difference may be a product grade, quantity or method. Budget reduction should be an explicit design decision, not an undisclosed downgrade.

Thailand’s OCPB advises careful review of contracts and initial payments because large advances without evidence of progress increase exposure. Understand what each payment funds and what evidence will support it.

Replace “half finished” with a defined deliverable, such as inspected services or installed cabinets ready for detailed review. Agree who checks the work, how defects are reported and what triggers the next payment.

There is no single appropriate deposit for every project. Custom production and procurement create different needs. Ask for an explanation, retain receipts and payment records, and have the contract reviewed for the actual work involved.

Renovation can expose hidden conditions. Agree in advance how they will be documented, who reviews them and how revised cost is approved before work proceeds. Separate discovered conditions from owner-requested changes.

“Do it now and price it later” leaves an unclear record. Use a change document identifying scope, reason, cost and schedule effect, with the agreed approval process. Keep everyone on the same drawing revision.

Hypothetical example: moving a sink can affect pipes, finishes, cabinetry and outlets. Review the whole change rather than the cabinet alone so its real cost can be weighed against the benefit.

Agree a handover checklist before the date arrives. Check cabinet movement, finish joints and functional water or electrical points; involve competent specialists for services. Overall appearance is not a substitute for operation testing.

Record defects with locations, responsible parties and correction dates. Request manuals, warranty information, maintenance details and as-installed drawings where included in scope.

A suitable team does not eliminate risk, but it welcomes verification, discusses difficult issues and records decisions. Resolve responsibility, inclusions and acceptance criteria before work starts.