Dear K. Taew,
We have finalized our calculation with an approval from K.Pichai Deepo below krub.
He recommended 10% of contingency for the square tiles and 15%for the diamond shape but we recommend to add 5% more krub.
1. LT-446 6x6 inches square, Jade Green (เขียวอ่อน) 40.0 sqm : Including 15% contingency
2. LT-B01, 2 inches Diamond Shape, Jade Green (เขียวอ่อน) 4.0 sqm : Including 20% contingency
3. LT-B01, 2 inches Diamond Shape, Green (เขียวเข้ม) 3.0 sqm : Including 20% contingency