Builders Insurance NZ

Specialized insurance for New Zealand builders and construction companies. Comprehensive protection for your projects, equipment, and business.

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Essential Insurance for Builders

Specialized coverage tailored to the unique risks faced by builders and construction companies in New Zealand.

Public Liability Insurance

Essential

Protection for third-party injuries and property damage on construction sites. Required by most construction contracts.

From $25/month Learn more →

Contract Works Insurance

Essential

Coverage for materials, works in progress, and temporary structures during construction projects.

From $50/month Learn more →

Professional Indemnity

Recommended

Protection against design errors, specification mistakes, and construction defects claims.

From $30/month Learn more →

Tools & Plant Insurance

Recommended

Cover for theft, loss, and damage to your tools, power tools, plant, and equipment on site or in your vehicle.

From $20/month Learn more →

Statutory Liability

Recommended

Covers fines and legal defence costs for unintentional breaches of the Health and Safety at Work Act 2015.

From $15/month Learn more →

Business Vehicle Insurance

Optional

Commercial cover for work utes, vans, and trucks used to transport tools and materials to site.

From $40/month Learn more →

Common Risks & Claims

Illustrative examples of common business risks. Amounts shown are hypothetical.

Construction Site Accident

Passer-by injured by falling debris on a residential build. Public liability covered $120,000 in medical and legal costs.

Illustrative example: $120,000

Structural Defect Claim

Design flaw in a retaining wall led to remediation work three years after completion. Professional indemnity covered $280,000.

Illustrative example: $280,000

Materials Theft from Site

$35,000 of building materials and copper wiring stolen from an unsecured site overnight. Contract works insurance provided replacement.

Illustrative example: $35,000

Third-Party Property Damage

Excavation work caused subsidence damage to a neighbouring property. Public liability covered $95,000 in structural repairs.

Illustrative example: $95,000

Health & Safety Prosecution

WorkSafe prosecution after a scaffolding incident. Statutory liability covered $55,000 in fines and legal defence costs.

Illustrative example: $55,000

Storm Damage to Works in Progress

Cyclone damaged a partially completed roof and framing. Contract works insurance covered $68,000 in rebuild costs.

Illustrative example: $68,000

Why Builders Need Insurance

Contract Requirements

Most construction contracts require builders to have comprehensive insurance before work begins. Without it, you cannot tender for most projects.

High-Risk Industry

Construction is one of the highest-risk industries in New Zealand. A single liability claim can easily exceed $100,000 in costs.

Project Protection

Contract works insurance ensures your projects stay on track even if materials are damaged, stolen, or destroyed by weather events.

Insurance by Builder Type

Different types of builders face different risks and have different insurance requirements. Here is what each type typically needs.

Residential Builders

Building new homes, renovations, and extensions. You work on or near occupied properties, often in established residential areas where neighbouring properties are at risk.

Key coverage needs:

  • ✓ Public liability ($1M-$2M minimum)
  • ✓ Contract works (full contract value)
  • ✓ Professional indemnity (if providing design)
  • ✓ Tools and plant cover

Commercial Builders

Commercial construction projects — offices, retail, industrial, and multi-storey. Higher contract values, more complex risk profiles, and stricter contractual insurance requirements.

Key coverage needs:

  • ✓ Public liability ($5M-$10M common)
  • ✓ Contract works (project-specific)
  • ✓ Professional indemnity (typically required)
  • ✓ Statutory liability
  • ✓ Employer's liability

Owner-Builders

Building or renovating your own home. While you may not need the same level of cover as a commercial builder, you still need to protect against liability to visitors, contractors, and neighbours.

Key coverage needs:

  • ✓ Public liability ($1M minimum)
  • ✓ Contract works (value of the build)
  • ✓ Material damage during construction

Subcontractors

Working under a head contractor on larger projects. You may be covered under the head contractor's contract works policy, but you typically still need your own public liability and tools cover.

Key coverage needs:

  • ✓ Public liability ($1M-$2M, check contract)
  • ✓ Tools and plant cover (your own equipment)
  • ✓ Professional indemnity (trade-specific)
  • ! Confirm contract works coverage with head contractor

Contract Requirements for Builders

Before you can start work on most construction projects, the principal or client will require you to hold specific insurance. Here are the most common contractual requirements builders face in New Zealand.

Minimum Public Liability

Most contracts require a minimum of $2 million in public liability cover. Commercial and government projects often require $5M or $10M. You will typically need to provide a Certificate of Currency before starting on site.

Contract Works Cover

Standard construction contracts (NZS 3910, NZS 3915) place the obligation on the head contractor to arrange contract works insurance for the full contract value. This covers the physical works, materials on site, and temporary structures against fire, storm, theft, and accidental damage.

Defects Liability Period

Contracts typically include a 12-month defects liability period after practical completion. Under the Building Act 2004, structural defect claims can arise for up to 10 years after the building work is completed. Maintaining adequate run-off cover is essential.

Professional Indemnity

If you provide design, specification, or project management services — not just labour — many contracts will require professional indemnity insurance. This is increasingly common as more builders take on design-and-build contracts.

Guaranty Building Products

Some contracts and building product manufacturers require builders to hold specific cover for products installed — particularly cladding systems, membrane products, and waterproofing. Check product warranties for insurance conditions.

Defects Liability & Run-Off Cover

One of the biggest risks for builders is claims that arise years after a project is completed. Under the Building Act 2004, building defect claims can be brought for up to 10 years after the work was done. This means you could face a claim long after you have moved on to other projects — or even after you have retired.

What Is Run-Off Cover?

Run-off cover (also called tail cover) extends your professional indemnity and public liability protection after you stop trading or retire. Without it, claims arising from past work would be uninsured. This is particularly important for builders who are winding down their business or transitioning to retirement.

Common Defect Claims

Defect claims typically involve:

  • - Weathertightness failures (leaking cladding, roofing, windows)
  • - Structural issues (foundation settlement, framing failures)
  • - Non-compliant building work discovered during resale
  • - Moisture damage from inadequate waterproofing
  • - Drainage and stormwater issues

The 10-Year Limitation Period

Under the Building Act 2004, civil proceedings for defective building work must be brought within 10 years of the act or omission. This means you could face a claim up to a decade after completing the work. If you plan to retire or close your building business, discuss run-off cover options with your insurance adviser.

Indicative Pricing by Builder Type

Indicative monthly premiums for different types of builders. Your actual premium will depend on your turnover, claims history, cover limits, and specific circumstances.

Builder Type Public Liability Contract Works Professional Indemnity Typical Total
Residential Builder
New homes, renovations, extensions
 From $25/mo From $50/mo From $30/mo $120-300/mo
Commercial Builder
Offices, retail, industrial
 From $45/mo From $80/mo From $50/mo $250-600/mo
Roofer
Working at height, weathertightness
 From $30/mo From $40/mo From $25/mo $100-250/mo
Plumber
Water damage risk, compliance
 From $20/mo Often not needed From $25/mo $60-180/mo
Electrician
Compliance-driven, fire risk
 From $20/mo Often not needed From $25/mo $60-180/mo
Scaffolder
High risk, working at height
 From $35/mo Often not needed From $30/mo $80-250/mo

All prices shown are indicative only and represent starting points. Your actual premium will be determined by your insurer based on a full assessment of your business.

How to Reduce Your Builder's Insurance Premium

There are practical steps you can take to keep your insurance costs down while maintaining adequate cover.

Get Site Safe Certified

Site Safe certification demonstrates a commitment to health and safety. Many insurers view certified businesses as lower risk, which can help with premiums.

Maintain LBP Status

Being a Licensed Building Practitioner signals competence and regulatory compliance. It demonstrates you meet the professional standards set by the Building Practitioners Board.

Choose a Higher Excess

Increasing your excess (the amount you pay per claim) will lower your premium. Make sure you can afford the excess amount if you do need to make a claim.

Clean Claims History

A history of no claims over several years is one of the strongest factors in keeping premiums low. Document near-misses and address root causes to avoid claims.

Site Security

Fencing, cameras, lockable storage, and alarm systems on construction sites reduce theft risk. Insurers may offer better rates for well-secured sites.

Bundle Your Policies

Combining multiple cover types (public liability, tools, vehicle, professional indemnity) into a single package with one insurer can reduce your overall cost compared to separate policies.

Frequently Asked Questions

Common questions about insurance for builders in New Zealand.

Is insurance compulsory for builders in New Zealand?
There is no single law requiring all builders to hold insurance in NZ. However, most construction contracts — particularly NZS 3910 and NZS 3915 — require the contractor to hold public liability, contract works, and professional indemnity insurance before work begins. Licensed Building Practitioners (LBPs) are not legally required to hold insurance, but virtually all principal contractors and clients will refuse to engage an uninsured builder.
What is contract works insurance and do I need it?
Contract works insurance (also called construction all-risks) covers the physical works, materials, and temporary structures on a building project against damage from fire, storm, theft, vandalism, and accidental damage during construction. If you are the head contractor, you typically arrange contract works cover for the full contract value. Subcontractors may be covered under the head contractor's policy, but should confirm this in writing before starting work.
What is the difference between public liability and professional indemnity for builders?
Public liability covers physical damage and injury — for example, a wall collapse injuring a passer-by, or your work damaging a neighbouring property. Professional indemnity covers financial loss from errors in your professional advice or design — for example, a specification error that leads to a defective building requiring remediation. Builders who provide design input, project management, or sign off on building work typically need both.
How much public liability cover do builders need?
Most construction contracts require a minimum of $2 million in public liability cover. For commercial projects, $5 million or $10 million is common. Residential builders working on smaller projects may find $1-2 million sufficient, but should check each contract for specific requirements. Higher-risk work such as demolition, earthworks, or work near existing structures may require higher limits.
What is defects liability insurance and why does it matter?
Defects liability insurance (or run-off cover) provides protection after a project is completed, covering claims for defects that emerge during the defects liability period — typically 12 months, but sometimes up to 10 years for structural defects under the Building Act 2004. Without run-off cover, a builder who retires or closes their business could face personal liability for defects discovered years later.
Does ACC cover builders for all workplace injuries?
ACC covers personal injury to workers — including your employees and yourself. However, ACC does not cover damage to property, consequential losses (such as a client's lost rental income), legal defence costs from liability claims, or exemplary damages. If your work causes damage to a client's property or a third party sues you, you need public liability insurance — ACC will not respond to those claims.

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