What makes a contract valid in South Africa? (Plain-English guide)
5 min read · General information, not legal advice
Quick answer
A contract is valid in South Africa when there is consensus (both parties agree), contractual capacity, a lawful purpose, performance that is possible, any required formalities, and certainty about the terms. Most service agreements don't need to be in writing — but a written, signed contract is far easier to enforce.
1. Consensus
Both parties must genuinely agree to the same terms. Misrepresentation, duress or a material mistake can undo that.
2. Capacity
Parties must be legally able to contract — adults, or companies acting through an authorised person. Contracts with minors usually need a guardian's assistance.
3. Lawfulness
The agreement can't be illegal or against public policy. Clauses that contradict the Consumer Protection Act may be unenforceable against consumers.
4. Possibility
What's promised must be possible to perform when the contract is made.
5. Formalities
Some contracts must be in writing and signed (e.g. sale of land, suretyships). Service agreements generally don't, but writing protects you.
6. Certainty
The price, scope and timelines must be clear enough to enforce. This is where templates help: every key term is a blank you must fill.
Can I sign electronically?
Yes. The ECT Act 25 of 2002 recognises electronic signatures for most agreements, including typed names and signing apps, as long as the intention to sign is clear.
