7 structural stages a homeowner should check on site in person

Architectural mistakes can be fixed, but structural mistakes stay buried in the house for its whole life. The moment to see with your own eyes (or send an engineer) is always "before concrete covers it", because nothing can be checked after the pour

7 key moments

• 1. Pile-driving day — Check pile size/length match the drawings, count the piles, and look at the final blow count (the number of blows at the end shows the pile has reached firm soil). Ask for a driving record for every pile
• 2. Before pouring footings — Footing rebar cages of the drawn size and quantity, with spacer blocks keeping steel off the soil, and no standing water or collapsed soil in the pit
• 3. Before pouring each floor's columns — Number of main bars, stirrup size, and stirrup spacing as drawn, especially closer spacing at column ends; formwork plumb
• 4. Before pouring beams and slabs — Top and bottom reinforcement complete, enough lap length (standard is about 40–50 bar diameters), and conduits and pipes embedded in the slab laid neatly before the pour
• 5. Major concrete pour days — Plant concrete comes with a delivery note stating compressive strength per spec, is vibrated to remove air bubbles, and test samples are taken (if specified in the contract)
• 6. Curing period — Columns and slabs must be kept wet continuously for at least 7 days after pouring; a site left dry after a pour is a sign of a careless team
• 7. Before closing ceilings/plastering over services — Photograph all pipe and cable runs before they're covered; these photos are invaluable when repairing the house ten years from now

What to do

State in the contract that "all structural work must be notified to the owner 1 day before being poured over". Visit and take dated photos every time. If you lack technical knowledge, hire an independent engineer for just these 7 moments (2,000–5,000 baht each, mid tens of thousands for the whole project) — compared with the value of the house, it's the cheapest insurance you can buy