Why This Happens
Mid-project price increases are a frequent source of conflict between South African homeowners and contractors. Some increases are legitimate — genuinely unforeseeable conditions (a structural problem hidden in a wall, rock encountered during excavation, materials that are suddenly unavailable and must be substituted at higher cost). Others are opportunistic — a contractor who underquoted to win the job, who misquoted due to carelessness, or who is deliberately gaming the process.
Handling this correctly requires distinguishing between the two, understanding your contractual rights, and responding in a way that either resolves the dispute or builds the paper trail for a legal claim if it comes to that.
Step 1 — Review the Contract
The first response to any mid-project price demand is to read the signed contract carefully. What you are looking for:
- Is there a variation clause? A well-drafted contract allows for variations to scope — additional or changed work — at agreed rates, but requires a signed variation order before the additional work proceeds.
- What does the contract say about price escalation? A fixed-price contract means the contractor absorbs materials cost increases and cannot pass them on unless there is a specific escalation clause.
- Was the additional cost caused by something that was clearly within the original scope, or by something genuinely unforeseen?
Legitimate vs Illegitimate Increases
Legitimate basis for additional cost:
- Work genuinely outside the original scope — you asked for something new or changed the design after work started
- Unforeseeable site conditions — asbestos discovered, rock encountered below the soil that was not in the brief, a burst water main within the walls
- Statutory requirements that became apparent only once work started — building inspector requiring an additional structural beam not originally specified
Not legitimate:
- Materials cost increases on a fixed-price contract where the contract does not include an escalation provision
- Labour cost increases because the job took longer than the contractor expected
- A claim that the contractor "forgot" to include an item in the original quote
- Additional work that is a direct consequence of the contractor's own defective work
How to Respond
Respond in writing (email). State clearly: "I have received your request for additional payment of R[X] relating to [description]. I am reviewing this against the contract. Please provide a written itemised breakdown of the additional costs and the specific reason each is outside the original contracted scope. I will revert within [5 business days]."
Do not agree to additional payments verbally or without a written variation order. Do not make payment in excess of the contracted milestone amount while the dispute is live.
If the Claim Is Legitimate
If you agree the additional cost is valid, issue a signed variation order specifying the additional work, the additional cost, and the revised total project price before any additional work proceeds. Never authorise additional costs verbally.
If the Claim Is Not Legitimate
Write a response explaining why you believe the claim is not covered by the contract and that you do not intend to pay it. Be specific — reference the contract clause and the original scope of work. If the contractor stops work in response to a disputed payment, this may constitute a breach of contract on their part. Keep a record of all communication.
If the dispute cannot be resolved directly and the amount is significant (above R20,000), get legal advice. An attorney's letter often produces resolution. For amounts below R20,000, the Small Claims Court is accessible without a lawyer.