If you only build to drawings someone else produced, professional indemnity (PI) insurance is advisable but not essential. The moment you draw up plans, specify structural elements or take over a designer's liability, you are acting as a designer, and you need a Design and Construct (D&C) PI policy. A standard PI policy will not extend to construction-specific design liability, and your CAR policy excludes design errors entirely.
What PI covers
PI insurance pays the compensation and legal costs when a client claims you were professionally negligent. For a contractor who also designs, D&C PI typically covers negligent design, specification or omission; errors that cause the client financial loss (a wall built to your faulty drawing collapses and you are sued for the rebuild); legal defence costs through investigations, adjudications and court; libel and slander arising from professional activities; and loss of or damage to documents.
What it does not cover matters just as much:
- Defective workmanship. Bad building (as opposed to bad design) is a CAR or warranty matter, not PI.
- Fitness-for-purpose obligations. Most policies exclude these unless specifically insured. If a contract says the design must be "fit for purpose", check your policy before signing.
- Fraud or deliberate wrongdoing, plus standard exclusions like asbestos, cyber and war.
Claims-made: the trap in the timing
PI is a claims-made policy: the claim must be made and notified during the policy period, not just relate to work done during it. Cancel your PI the day a project finishes and a claim arriving a year later is not covered, even though you were insured when you did the design. Keep the cover running for as long as a client could realistically sue, which can be years after completion.
When PI is contractually required
- Standard form contracts. Where you accept design responsibility under a JBCC or NEC contract, the contract typically requires PI. The JBCC suite is the dominant standard form in South African building work.
- Government and public-sector tenders. CIDB-regulated procurement increasingly lists PI, alongside public liability and NHBRC enrolment, as a due-diligence requirement on appointment.
- Design-and-build with employer's requirements. Where the employer specifies fit-for-purpose design, check the fitness-for-purpose exclusion carefully; a specialist extension may be needed.
- Collateral warranties after completion. If you sign a warranty to a funder or tenant, most PI policies can extend to it, but it must be declared to the insurer.
Does a small builder need PI?
It depends on whether you are taking on design responsibility, formally or informally.
If you simply follow drawings produced by an architect or engineer and claim no design role, PI is not essential, though claims can still arise from advice given casually on site, so it remains worth a quote.
If you draw up plans, specify lintels or beams, or novate (take over) the engineer's or architect's design liability, PI is essential. Without it you carry unlimited personal exposure, and some contracts are void or breached if the required cover is missing. Many small builders informally sketch their own plans for low-cost residential extensions; if anything goes wrong structurally, that builder is exposed as a de facto designer.
The practical rule: if you ever say "I'll work it out on site", or your sketch becomes the build specification, you are designing. Get PI.
What it costs
Honest answer: we could not verify premium ranges for small-contractor D&C PI from primary South African sources, so we will not publish a number as fact. Premiums turn on your turnover, the kind of design work you do, your limit of indemnity and your claims history. Excesses on small-builder policies are often quoted in the low thousands to mid five figures of rand, but that is an indicative range, not a verified figure; the only number that counts is the one on your policy schedule. Get quotes from a specialist SA construction broker.
A worked example
Thabo is a small builder. A homeowner asks him to extend her kitchen. Thabo draws his own plans and picks a lintel he believes is adequate. Six months after completion the lintel sags and the brickwork cracks. The homeowner sues for R85,000 demolition and rebuild plus R30,000 in engineer's fees.
Without PI, Thabo pays from his own pocket or faces sequestration. With a D&C PI policy carrying a R500,000 limit of indemnity, the insurer runs the defence and pays the claim, less his excess. The premium he paid is small against a R115,000 personal liability.
Common mistakes
- Assuming CAR covers design errors. It explicitly excludes them.
- Buying general PI instead of D&C PI. A standard professional policy does not extend to construction design liability.
- Cancelling PI when the project ends. Claims-made cover only pays for claims notified while the policy is live.
- Signing a fit-for-purpose obligation without checking the exclusion. It is one of the most common gaps in D&C policies.
- "It's just a sketch." If the build follows your sketch, you designed it.
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