Comparisons1 min read
Piles or a raft? How to choose your building’s foundation
The choice between piles and a raft depends on the borehole report and the building loads — not on the contractor’s opinion. Here is the difference in full.
Eng. Ahmed El-Shennawy
Structural engineer · NSCO Construction
The short answer: the borehole report decides — not the contractor, and not the budget. Weak soil or high loads force piles; firm soil under moderate loads is well served by a raft.
When do you need piles?
- Weak soil, or deep fill
- A high water table
- A tall building with concentrated loads
- Adjacent buildings that are sensitive to settlement
A quick comparison
| Criterion | Raft | Piles |
|---|---|---|
| Suitable soil | Firm to medium | Weak or filled |
Frequently asked questions on this topic
01What does a borehole report cost?
Little, next to the cost of the foundations themselves — and it saves several times its cost by stopping you over-designing.
02Could I use isolated footings instead of either?
Yes, for small buildings on good soil. The choice depends on the loads, the spacing between columns and the bearing capacity of the soil.
Got a plot and want a real number for your project?
Send us the area, the location and the finishing level you have in mind, and we will come back with a preliminary offer within 48 hours.
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