Cost Plus Contractor Agreement Template for New Zealand

A Cost Plus Contractor Agreement is a flexible contracting arrangement where you pay the contractor for their actual project costs plus an agreed markup or management fee. Unlike fixed-price contracts, this structure provides transparency in cost accounting while allowing for scope changes and unforeseen circumstances that commonly arise in complex projects.

When do you need this document?

You'll need this agreement when engaging contractors for projects where the final scope or costs cannot be accurately determined upfront. This commonly occurs in renovation projects with unknown structural issues, emergency infrastructure repairs, research and development projects, or complex construction where design specifications may evolve during execution. The cost-plus structure is also valuable when you want maximum transparency in project costs and prefer to retain control over project decisions rather than transferring all risk to the contractor. It's particularly useful for time-sensitive projects where you need to commence work before finalizing all specifications.

Key legal considerations

Your agreement must clearly define what constitutes reimbursable costs versus contractor overhead and profit. You should establish robust cost accounting procedures, including record-keeping requirements, receipt submission protocols, and your audit rights to verify expenses. The markup calculation methodology needs precise definition - whether it's a percentage of costs, fixed management fee, or tiered structure based on project value. Payment terms must align with the Construction Contracts Act 2002, including progress payment schedules and dispute resolution procedures. You'll also need clear change order processes, since scope variations are common in cost-plus arrangements. Risk allocation clauses should address cost overruns, schedule delays, and performance standards, while ensuring the contractor maintains appropriate insurance coverage.

Legal requirements in New Zealand

Under the Construction Contracts Act 2002, your agreement must include specific payment provisions, progress payment procedures, and dispute resolution mechanisms. The Act requires clear payment schedules and provides statutory rights for both parties regarding payment claims and responses. Health and Safety at Work Act 2015 obligations must be explicitly addressed, defining each party's safety responsibilities and compliance requirements. GST treatment requires careful consideration under the Goods and Services Tax Act 1985, particularly for separating reimbursable costs from contractor fees. The Contract and Commercial Law Act 2017 governs general contract formation and interpretation principles. You should ensure the agreement includes provisions for statutory warranties, lien rights, and compliance with relevant building codes and consent requirements. Professional indemnity and public liability insurance requirements should align with industry standards and regulatory expectations.