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TL;DR: Public liability insurance for builders and contractors pays the legal costs and compensation if your work injures a member of the public or damages someone else’s property, such as a neighbour’s wall, a passer-by’s car or underground services. It does not cover the building you are working on, your own plant or faulty workmanship itself, and damage caused by excavation next to a neighbouring property often needs a specific extension. The premium is set by the insurer after underwriting and depends mainly on the type of work you do, your contract values, the limit you choose and your claims history.
If you build, renovate or work on site in South Africa, sooner or later someone will ask for proof of public liability insurance. It might be the client, the principal contractor, an estate’s body corporate or the bank financing the project. The question behind the request is simple: if your work hurts someone or damages their property, can you pay for it?
This guide explains what public liability insurance covers for builders and contractors, where the usual gaps are, how much cover to carry and what drives the cost. It is general information, not advice on a specific policy or contract. The wording of your policy and your building contract always decide the outcome of a claim.
In this article
What public liability insurance covers for builders
Public liability insurance responds when a third party, meaning anyone who is not you or your employee, claims that your business activities caused them bodily injury or damaged their property. For a builder or contractor, that typically includes:
Injury to members of the public: a pedestrian hit by falling material, a homeowner who trips over equipment left in a passage, or a visitor injured on a site you control.
Damage to neighbouring property: a boundary wall knocked by a delivery truck, paint or concrete splashed on a neighbour’s car, or water damage to the unit below during a bathroom renovation.
Damage to the client’s existing property: on alterations, the parts of the house or building you are not working on, subject to the policy wording.
Damage to underground services: a cut water main, fibre or electrical cable, often subject to a specific condition or sub-limit.
Legal defence costs: the cost of defending a claim, which can be significant even when the claim is eventually unsuccessful.
The policy pays what you are legally liable to pay, up to the limit you choose. It is not a guarantee that every complaint will be paid; the insurer looks at whether you were legally responsible and whether the event falls within the cover. For a broader view of the cover itself, see our public liability insurance page.
What it usually does not cover
Most disputes about builders’ liability claims come down to a small number of exclusions. Knowing them in advance is the best way to avoid an uncovered loss:
The works themselves. Damage to the building you are constructing or altering is a contract works (contractors’ all risks) matter, not public liability. If a storm brings down the new roof trusses, it is the contract works policy that responds.
Faulty workmanship. The cost of redoing defective work is a business risk, not an insured liability. If the defective work then damages someone else’s property, that resulting damage may be covered.
Your own plant and tools. Excavators, scaffolding, compressors and hand tools need plant or equipment cover. Berkley Risk now offers a Plant All Risks application form online for this.
Injuries to your own employees. These fall under the Compensation for Occupational Injuries and Diseases Act (COIDA), which many employers supplement with separate employer’s liability cover.
Liability you take on by contract. Indemnities you sign that go further than the law would otherwise impose may not be covered unless the policy is extended.
Vibration, removal or weakening of support. Many standard policies exclude or limit this, which matters a great deal on any job involving excavation. More on this below.
Excavation, lateral support and neighbouring property
Excavation is where builders’ liability claims tend to become expensive. Digging foundations, basements, pool shells or retaining walls next to a boundary can cause a neighbour’s land to move, walls to crack or, in the worst cases, a structure to fail.
In South African law the duty to provide lateral support to neighbouring land is strict. In Petropulos and Another v Dias [2020] ZASCA 53, a case that began with excavation for a new house on a slope in Camps Bay, the Supreme Court of Appeal confirmed that liability for breaching the duty of lateral support does not depend on proving fault, and that the duty is owed to neighbouring buildings as well as the land itself. The project engineer was also drawn into the proceedings. An owner who is sued in this way will often look to the contractors and professionals who did the work.
Many public liability policies exclude or sub-limit damage caused by vibration or by the removal or weakening of support unless an extension is added and the insurer has assessed the work. If your projects involve excavation near boundaries, sloping sites or older neighbouring structures, raise it before work starts. Our page on lateral support insurance explains what insurers typically ask for, such as engineer’s reports, dilapidation surveys of the neighbouring buildings and the excavation method.
Extensions builders should ask about
Standard public liability wordings are written for a broad range of businesses. Builders and contractors usually need some of the following extensions, depending on the work:
Removal or weakening of support for excavation and underpinning work.
Underground services damage, often with conditions about obtaining service plans before digging.
Hot work such as welding, cutting and torch-on waterproofing, usually with conditions about fire extinguishers and fire watches.
Products and completed operations for claims that arise after you have finished and left site.
Contractual liability where your contract requires you to indemnify the employer or principal contractor.
Cross liabilities and indemnity to principal where more than one party is named on the policy.
Property in your care, custody or control for work inside an occupied home or building.
Each extension has its own conditions and sometimes its own lower limit. A policy that looks adequate at the headline limit can carry a much smaller sub-limit for the exact risk your project creates.
Who needs it on a project
On a typical South African building project, several parties carry their own liability exposure:
Main contractors need cover for their own work and, depending on the contract, for the subcontractors they appoint.
Subcontractors and specialist trades such as electricians, plumbers, roofers, waterproofers and shopfitters are increasingly asked to carry their own cover rather than rely on the main contractor’s.
Developers and project owners can be held liable as the owner of the land, which is why many arrange principal’s liability or ask to be noted on the contractor’s policy.
Owner-builders managing their own build take on liabilities that a contractor would normally carry.
Estates and complexes often add their own requirements. On the KZN North Coast, many estates will not allow a contractor on site without evidence of liability cover at a set limit; our page on contractor project insurance on the North Coast covers this in more detail. In Cape Town, alterations beside existing and older buildings raise their own questions, which we deal with on our Cape Town contractor project insurance page.
How much cover do you need?
There is no single right limit. Start with the minimum your contracts require, then test it against a realistic worst case:
Contract and estate requirements. Building contracts and tender documents often set out the insurance the contractor must carry, sometimes with minimum amounts, and estates and body corporates may set their own. Treat these as a floor, not a target.
What could you damage? Working beside a high-value home, a commercial building or a busy public road raises the potential claim size sharply.
Several claims in one year. Check whether the limit applies to each event or to the whole policy year, and whether legal costs fall inside or outside the limit.
Sub-limits. Confirm the limit that applies to removal of support, underground services and products, not only the headline figure.
If you tender for larger or public sector work, the employer will usually also ask for other security, such as a performance guarantee, alongside proof of insurance.
What drives the cost
Builders often ask what public liability insurance costs. The honest answer is that the insurer sets the premium after underwriting, and two contractors with the same turnover can pay very different amounts. The main factors are:
The type of work. Painting and finishing work is viewed very differently from excavation, demolition, roofing at height or hot work.
Turnover and contract values. Larger and more numerous projects mean more exposure.
The limit and deductible. A higher limit costs more; a higher deductible can bring the premium down.
Claims history. Previous liability claims, and how they were handled, weigh heavily.
Where you work. Dense urban sites, sloping ground and work beside occupied buildings carry more third-party risk.
Subcontractor controls. Insurers look favourably on contractors who check that their subcontractors carry their own cover.
Extensions. Removal of support, hot work and contractual liability all add to the premium, because they add real cover.
The cheapest quote is rarely the best value if it leaves out the extension your work actually needs. Comparing policies on wording, sub-limits and conditions, not just price, is where a specialist broker adds value.
Annual policy or project cover?
Most contractors who work continuously arrange an annual policy that covers all their projects within agreed limits and turnover. It is simpler to manage and gives you a certificate to hand over at the start of each job.
Project-specific cover makes sense for a once-off build, an unusually large contract, or a project with requirements your annual policy cannot meet, such as a higher limit or a specific principal to be noted. It is often arranged together with contract works cover for the same project. Berkley Risk’s online application forms include a single-contract contract works form and a general liability form for this.
How it fits with the rest of your construction cover
Public liability is one part of a construction insurance programme. On a typical project, the main pieces are:
Contract works for loss of or damage to the works under construction.
Public liability for injury and damage to third parties.
Plant all risks for owned and hired-in plant and equipment.
Professional indemnity where you carry design or advisory responsibility.
Guarantees such as performance, advance payment and retention guarantees, arranged through bond and guarantee insurance.
To get a quote that reflects your actual risk, have the following ready:
A description of the work you do, including any excavation, demolition, roofing or hot work.
Your annual turnover and typical contract values.
The limits your contracts or estates require, and any parties to be noted on the policy.
Details of current or previous cover and any claims in the last five years.
How you use and check subcontractors.
Berkley Risk is an authorised financial services provider (FSP 54407) and specialist insurance broker whose services include construction and engineering, liability, and bonds and guarantees. We can review your current cover against your contracts and the work you actually do. Contact Berkley Risk to discuss your requirements.
Frequently asked questions
Is public liability insurance compulsory for builders in South Africa?
There is no general law that makes it compulsory for every builder, but most building contracts, principal contractors, estates and financiers require it before you can start work. In practice, it is very hard to win work without it.
Does public liability cover damage to the house I am building?
No. Damage to the works under construction falls under contract works insurance. Public liability covers injury and damage to third parties and their property.
Am I covered if my excavation cracks a neighbour’s wall?
Only if your policy includes cover for removal or weakening of support, or does not exclude it, and you meet its conditions. Because the duty of lateral support is strict in South African law, this is one of the most important extensions for builders who excavate.
Do my subcontractors need their own public liability cover?
It depends on your contract and your policy. Many main contractors now require subcontractors to carry their own cover, and insurers often expect you to check it. Relying entirely on the main contractor’s policy can leave gaps.
How much does builders’ public liability insurance cost?
The insurer sets the premium after underwriting. It depends mainly on the type of work, turnover and contract values, the limit and deductible, claims history and any extensions needed. A broker can obtain quotes that compare like for like.
What is the difference between public liability and professional indemnity for builders?
Public liability covers physical injury and property damage caused by your work. Professional indemnity covers financial loss caused by errors in design, specification or advice. Builders who design or advise often need both.
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