What SO means
SO is a CIDB class of work meaning Water supply and drainage for buildings. Wet services and plumbing within buildings: water supply, drainage, sanitaryware, geysers and associated pipework. If you are a plumbing contractor bidding on government work, SO is usually the class you need.
On a tender you will usually see the grade and class written together. A requirement of 6SO means Grade 6 in the Water supply and drainage for buildings class. You are graded separately in each class you register for, so you can hold a high grade in one class and a low grade in another.
What each SO grade lets you bid for
| Grading | Maximum tender value |
|---|---|
| 1SO | Entry level, no financial qualifying criteria |
| 2SO | Up to R1 000 000 |
| 3SO | Up to R3 000 000 |
| 4SO | Up to R6 000 000 |
| 5SO | Up to R10 000 000 |
| 6SO | Up to R20 000 000 |
| 7SO | Up to R60 000 000 |
| 8SO | Up to R200 000 000 |
| 9SO | No limit |
CIDB revises these tender value ranges periodically, so confirm the current figures on the CIDB Register of Contractors.
Open tenders needing this work
There are currently 96 open Plumbing tenders in South Africa.
Browse Plumbingtenders →Other CIDB codes
For the full grading table and how CIDB registration works, read CIDB grades explained.