My experiences in constructing house ( majority of the raw materials should be purchased by us to minimize costs etc).

I am a civil engineer by profession and had been a part of several small and large house construction projects in my locality.

purchase your own building materials, but don't stock it, keep regular supply as and when required. Material wastage is a big loss especially when cost are running high.
Appoint a labourer contractor for construction. Never pay them on daily basis. Fix the total cost of construction in advance based on sq. Ft basis.
Never pay to anyone in advance, always pay after material delivery and after work is completed.
Visit your construction site everyday, spend time with workers and understand the work so that they don't take you for a ride.

5 . Visit nearby construction sites to see there working and also have a survey of material shops to evaluate who is selling better material at reasonable price.

6. Get the plan of your house and cost finalised beforehand to ascertain everything is within budget.

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