Foundations · Soil Tests
Do I need a soil test for a villa extension?
If the extension has new foundations, yes. A soil test is required wherever a substructure is built.
The short answer
Yes, if the extension needs new foundations. A soil test is required wherever a substructure is built, such as the foundations of an extension, a garden suite, a pool, a pergola, a car shade or a boundary wall. The results are used to design the foundations, and the structural calculations are stamped for the developer NOC and the building permit.
NeededWherever a substructure is built
Used forFoundation design
ThenCalculations and approvals
What you need to know
- Substructures: Foundations for extensions, pools, shades and walls.
- Foundation design: Based on the soil test.
- Calculations: Stamped for approval.
- Shoring: Where the excavation needs it.
Documents you may need
- Title deed and owner ID
- Affection plan or site plan
- Existing drawings or as-built drawings
- Photos of the area
- Developer NOC (where the community has a developer)
Who does what
Step by step
We confirm the exact route for your project.
| Step | Approval route | Guides |
|---|---|---|
| Soil test Soil testing laboratory | Required wherever a substructure such as a foundation is built. | Soil tests |
| Foundation design Structural Solutions | Foundation and substructure calculations and drawings. | Structural calculations |
| Shoring, where needed Consultant → DM, DDA or Trakhees | Shoring design and approval where the excavation needs it. | Shoring |
| NOC and permit Developer and authority | The developer NOC first, then the building permit. | Approvals |
| Inspection Authority | Inspections and the completion certificate. | — |
Questions
Related questions
Do I need a soil test for a pergola?
If it has new foundations, yes.
Who carries out the soil test?
A soil testing laboratory.
Can I use an old soil test?
Ask us; we check whether it can be used for your plot.
What if I extend upwards only?
The existing foundations are checked by assessment.
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