Hiring an excavator operator without checking their insurance is one of the most common mistakes NZ homeowners make. If something goes wrong — a burst water main, a damaged boundary fence, or an injury on site — you could be left footing the bill if your contractor isn't properly covered. The good news is that verifying public liability insurance is straightforward once you know what to ask for.
What Is Public Liability Insurance and Why Does It Matter?
Public liability insurance protects you (and the public) if the contractor causes property damage or personal injury while working on your site. For excavation work, the risks are real: underground services can be struck, retaining walls can be undermined, and neighbouring properties can be affected by ground movement or flooding.
Without this cover, any damage caused during the job could become your financial problem — especially if the contractor is a sole trader with limited assets. Most reputable excavation contractors in NZ carry at least $1 million to $2 million in public liability cover, though larger commercial jobs may require more.
How to Ask for Proof of Insurance
The simplest step is to ask directly — before signing any contract or paying a deposit. A professional contractor will have no hesitation providing proof. Here's what to request:
- A current Certificate of Currency — this is a one-page document issued by the insurer confirming the policy is active, the level of cover, and the expiry date.
- The policy number and the insurer's name so you can verify it independently if needed.
- Confirmation that the policy specifically covers earthmoving and excavation work, as some general liability policies exclude certain high-risk activities.
Always check the expiry date on the certificate. A policy that lapsed last month offers you no protection today.
Verifying the Certificate Is Genuine
Unfortunately, fraudulent or outdated certificates do exist. To verify the certificate is legitimate:
- Contact the insurer directly — call the insurance company listed on the certificate and quote the policy number. Ask them to confirm the policy is current and active.
- Check the insured name matches — the business name or individual name on the certificate should match the contractor you're hiring and the name on their invoice or quote.
- Look for the broker's details — many NZ contractors use insurance brokers. You can contact the broker to confirm the certificate is valid.
This takes only a few minutes and gives you genuine peace of mind.
What to Look for in the Certificate
When you receive a Certificate of Currency, check these key details:
| Detail | What to Check |
|---|---|
| Insured name | Matches your contractor's trading name or legal name |
| Type of cover | Includes public liability (not just vehicle or equipment cover) |
| Level of cover | At least $1 million — more for larger jobs |
| Expiry date | Policy is current for the duration of your project |
| Activity covered | Earthmoving, excavation, or civil works included |
Other Insurance to Consider
Public liability is the most important, but it's worth asking about:
- Statutory liability insurance — covers fines or penalties arising from unintentional breaches of NZ law (such as accidentally striking a gas line).
- Contract works insurance — covers damage to the works themselves during construction.
- Vehicle and plant insurance — covers the excavator and associated machinery.
For larger projects, your own home and contents insurer may also want to know excavation work is taking place, so it's worth giving them a quick call.
Underground Services and Legal Obligations
Before any excavation begins, your contractor is legally and professionally obligated to locate underground services. In NZ, this means contacting Dial Before You Dig (0800 248 344 or beforeudig.co.nz) to identify the location of gas, water, electrical, and telecommunications lines. Striking a live service can cause serious injury or death, and liability can fall on the contractor — or the homeowner — if proper checks weren't carried out.
WorkSafe NZ sets out health and safety obligations for excavation work, and your contractor should be familiar with these requirements.
Building Consents and Excavation
Depending on the scope of work, excavation may require a building consent from your local council. Significant earthworks, retaining walls over certain heights, or work near boundaries often trigger consent requirements. Schedule 1 of the Building Act lists some exemptions, but always confirm with your council before work starts. MBIE Building Performance has useful guidance on when consents are required.
When to Call a Professional
Excavation work carries significant risks — to people, property, and underground infrastructure. Always hire a qualified, experienced excavation contractor rather than attempting significant earthworks yourself. A reputable professional will:
- Carry current public liability insurance and provide proof without hesitation
- Locate underground services before breaking ground
- Comply with WorkSafe NZ health and safety requirements
- Advise you on consent requirements
You can find qualified local excavation contractors on tradedirectory.co.nz — always ask for their Certificate of Currency before work begins.
Licensed Building Practitioner (LBP)
