Terms of Trade for Engineering Firms in New Zealand

Engineering firms often do high value work under tight timelines, changing scopes and technical assumptions that are not always obvious to the client. That is exactly why weak or outdated terms of trade can become expensive. Common mistakes include relying on a quote alone, using generic terms copied from another industry, and starting work before the customer has agreed who carries the risk for delays, design changes, defective inputs or unpaid invoices.

Good terms of trade for engineering firm work should do more than say when payment is due. They should explain what you are supplying, what sits outside scope, how variations are approved, what happens if a client delays the project, and where your liability stops. For New Zealand engineering businesses, this guide explains what terms of trade are meant to cover, the legal issues to check before you sign, and the drafting traps that commonly cause disputes with commercial clients, contractors and developers.

Overview

Terms of trade are the contract rules that sit behind your quotes, proposals, purchase orders and ongoing supply arrangements. For engineering firms, they are most useful when they clearly allocate payment risk, project risk and responsibility for technical assumptions before work starts.

• Make sure your terms say exactly what services, deliverables and materials are included, and what is excluded.
• Set clear payment rules, including deposits, milestone billing, late payment consequences and when you can suspend work.
• Deal with variations properly, including who can approve them and how pricing will be calculated.
• Address client delays, site access, third party information and reliance on client supplied data.
• Limit liability in a way that is fair, clear and suitable for the type of engineering work you do.
• Check whether any consumer law protections or fair trading rules affect your wording.
• Align your terms with insurance, subcontracting arrangements and any design responsibilities you accept.

What Terms of Trade for Engineering Firm Means For New Zealand Businesses

For a New Zealand engineering business, terms of trade are the practical contract terms that govern how work is quoted, accepted, delivered and paid for. They are not just back office paperwork. They are the document you rely on before you sign, before you accept the customer's purchase order, and before you rely on a verbal promise about scope or timing.

Many engineering firms use the phrase terms of trade to cover their standard customer terms attached to quotes, proposals, credit applications or service agreements. In some jobs, those terms will operate as the main contract. In others, they will sit alongside a more detailed consultancy agreement, design contract, fabrication agreement or supply contract.

The core job of your terms is to answer the questions that usually cause arguments later. That includes:

• What exactly are you being engaged to do?
• What assumptions have you priced on?
• What information are you relying on from the client or other consultants?
• What happens if the scope changes?
• When do you get paid?
• What rights do you have if the client causes delay or fails to cooperate?
• How far does your liability extend if something goes wrong?

Why engineering firms need more than a basic quote

A short quote can work for simple jobs, but it rarely covers the issues that matter on engineering projects. If your quote only lists a price and broad description of work, you may still be exposed to disputes over rework, unpriced variations, site conditions, testing, compliance responsibilities or who wears the cost of delays.

This is where founders often get caught. The customer says the work was meant to include one more site visit, one more revision or one more certification step. The engineer says it was never in scope. If your terms do not tie down the scope and variation process, that argument can become a debt recovery issue very quickly.

Typical situations where terms of trade matter

Engineering businesses use terms of trade in a wide range of situations, including:

• design consultancy and advisory work
• fabrication and manufacture of custom components
• installation, commissioning and maintenance services
• supply of engineered products or systems
• civil, mechanical, electrical or structural project work
• ongoing service relationships with commercial clients

The exact wording should match the work. A firm providing professional design advice has different risk points from a business fabricating and installing equipment. A business selling engineered products online or through order forms may also need its terms to align with sale of goods obligations, delivery terms and acceptance procedures.

How New Zealand law affects your terms

New Zealand contract law generally allows businesses to decide their commercial terms, but your wording still needs to be clear, incorporated properly and consistent with laws that cannot be avoided in every situation.

For example, the Fair Trading Act 1986 affects how you describe your services and what you promise in quotes, proposals and negotiations. You should not overstate performance, certification status, timeframes or outcomes. Statements made before the contract is signed can still matter later.

The Consumer Guarantees Act 1993 may also be relevant if you deal with consumers, although many engineering firms work mainly business to business. Where services are supplied to consumers, certain guarantees may apply and cannot simply be contracted out of. In some business to business arrangements, parties can agree to contract out of the Consumer Guarantees Act if the statutory requirements are met and the contracting out is fair and recorded properly.

If your engineering firm collects personal information, such as contact details, site access details or customer representative information, your contract practices should also line up with the Privacy Act 2020. That usually means being transparent about what information you collect, why you need it, and who you share it with, especially if you use cloud systems, subcontractors or external project management platforms, and whether you have a clear privacy notice.

Legal Issues To Check Before You Sign

The main legal question is not whether you have terms, but whether your terms actually match the way you take on work. A solid set of engineering terms should reflect your quoting process, project risk and commercial reality, not just generic wording from another supplier.

Scope of services and deliverables

Your scope clause should state exactly what you are supplying and what the client is paying for. If the job includes design only, say that. If it includes supply, installation, testing or certification, spell that out as separate components where possible.

It also helps to state what is excluded. Exclusions might include:

• consenting or regulatory approvals
• geotechnical investigations or specialist reports
• third party certification
• site supervision beyond specified visits
• project management services
• as built documentation unless separately listed

Clear scope wording reduces the chance that your client assumes broader responsibilities sit with you.

Assumptions and client supplied information

Engineering work is often priced on assumptions. Those assumptions should not stay buried in emails or internal notes. Put them into the contract or the accepted quote.

This may include assumptions about:

• site access and working hours
• availability and accuracy of plans
• load data, dimensions or specifications supplied by the client
• existing infrastructure conditions
• timely decisions from the client and other consultants
• availability of materials or specialist subcontractors

If your design or advice depends on client supplied information, say that you are entitled to rely on it unless you agree otherwise. This does not remove all professional responsibility, but it can make the commercial position much clearer.

Variations

Variation clauses matter because engineering scopes change constantly. Your terms should say that any change to scope, timing, deliverables, quantity, specifications or assumptions may result in a variation to price and programme.

The clause should also deal with process. For example:

• who can request a variation
• who in your business can approve it
• whether approval must be in writing
• how you price additional work, such as fixed price, schedule of rates or time and materials
• whether you can continue urgent work before formal approval if safety or project continuity requires it

Without a proper variation mechanism, firms often end up doing extra work first and arguing about payment later.

Price and payment terms

Your payment clause should be specific and operational. If the customer reads it on a Friday afternoon, they should know exactly when invoices are issued, when they fall due, and what happens if they are not paid.

Points commonly worth covering include:

• deposit requirements
• progress or milestone billing
• payment due dates
• whether prices are estimates or fixed for a stated scope
• disbursements and reimbursable expenses
• interest on overdue amounts
• recovery costs for overdue debts
• your right to suspend work for non payment

If you supply goods as well as services, title and risk clauses may also be relevant. Those clauses should be drafted carefully, especially if products are customised, installed on site or combined with other equipment.

Timing, delay and extensions

Project timing disputes usually start with assumptions that were never written down. If your delivery dates depend on site readiness, customer approvals, access, information or third party work, your terms should say so clearly.

A useful delay clause may cover:

• your right to extend time where the client or others cause delay
• storage or standby costs if goods are ready but cannot be delivered or installed
• rescheduling costs for labour and subcontractors
• what happens if delays continue for an extended period

This is especially important where your team is booking specialist staff, fabrication capacity or site crews in advance.

Liability, warranties and insurance alignment

Your liability clause should be realistic, clear and consistent with your insurance. A clause that is too aggressive may not hold up well in practice, while a clause that is too loose can leave you exposed to claims far beyond the value of the job.

Depending on the work, your terms may address:

• limits on indirect or consequential loss
• overall caps on liability
• time limits for bringing claims
• client obligations to inspect and notify defects promptly
• limits on liability where the client modifies your work or ignores your recommendations
• whether you give express warranties, and if so, their scope and duration

If you provide professional engineering design services, be careful not to promise a result that goes beyond what you can reasonably stand behind. Insurance wording, professional standards and client expectations should all line up.

Termination and suspension rights

You need a workable exit position before you sign a contract. If the client does not pay, repeatedly changes scope, fails to cooperate or becomes insolvent, your terms should let you suspend work or terminate with clear consequences and termination rights.

That clause should also deal with payment for work already performed, costs incurred, and ownership or use of partially completed work product.

Intellectual property and use of designs

Engineering firms often create drawings, calculations, specifications, software configurations or technical documentation. Your terms should say who owns that intellectual property and what licence the client gets to use it.

In many cases, the client only needs a licence to use the deliverables for the specific project and purpose paid for. If you want to stop reuse on other sites, unauthorised modification or sharing with third parties, your terms should say so.

Common Mistakes With Terms of Trade for Engineering Firm

The biggest mistake is treating terms of trade as a standard form that never needs review. Engineering work changes, customer types change, and risk can shift quickly from one project to the next.

Using broad wording that does not match the job

Many firms use one set of terms for all work, from design advice to fabrication to maintenance. That often creates gaps. A maintenance job needs service response and access wording. A fabrication job needs product acceptance and delivery wording. A design consultancy engagement needs reliance and liability language that reflects professional advice risk.

Letting the client's purchase order override your terms

A common founder moment goes like this: you send a quote with your terms attached, the client sends back a purchase order with its own terms, and your team starts work immediately. If no one checks which document actually governs the deal, you may end up bound by the customer's standard terms instead.

This is where contract formation and contract review matter. Your acceptance process should be consistent. Staff should know what must happen before work starts, especially on larger jobs or where the customer is a developer, head contractor or large manufacturer with procurement paperwork.

Leaving variation approval too informal

If your project managers regularly act on phone calls, site discussions or text messages, unpaid variation disputes become much more likely. Informal approvals are common in practice, but your contract should still set a minimum standard for evidence and authority.

Even a simple requirement that variations must be confirmed by an authorised representative can make a big difference.

Overpromising on timeframes or outcomes

Sales pressure can lead to optimistic commitments about delivery, performance or certification. The legal risk is not only breach of contract. Overstatements made during negotiations can also create issues under fair trading rules if the client says they were misled.

Descriptions should be accurate, qualified where necessary, and tied to stated assumptions.

Forgetting downstream contracts

Your customer contract should fit your subcontractor and supplier arrangements. If your contract gives the client a fixed completion date or a broad warranty, but your own suppliers do not accept equivalent obligations, your margin can disappear fast when something goes wrong.

Check consistency across:

• subcontractor scopes and back to back obligations
• supply lead times
• warranty periods
• insurance requirements
• defect response procedures

Not updating terms as the business grows

A small engineering business may begin with one off jobs and simple quotes. Later it may take on larger commercial work, recurring service contracts, online sales of engineered products or software enabled systems. Your legal documents should evolve with those changes.

If you are now selling online, using digital acceptance flows, storing customer details in project systems, or licensing software or data interfaces as part of your offering, your contract set may need more than basic trade terms. Privacy wording, software licence terms and platform conditions may also become relevant, along with website terms and conditions.

FAQs

Do engineering firms in New Zealand need written terms of trade?

Written terms are not legally mandatory for every job, but relying on verbal agreements or a short quote is risky. For most engineering firms, written terms are the safest way to record scope, payment, variations and liability before work begins.

Can an engineering firm limit its liability in standard terms?

Often yes, but the clause needs to be drafted carefully and applied in the right context. The wording should be clear, reasonable in a commercial setting, and consistent with any laws that cannot be excluded and with your insurance arrangements.

Are quotes and terms of trade enough, or do we need a longer contract?

That depends on the project. Simple repeat work may be covered by a well drafted quote and standard terms. Higher value, design heavy or project specific work often needs a fuller agreement that deals with technical risk, programme, deliverables and intellectual property in more detail.

Can we contract out of the Consumer Guarantees Act?

Sometimes, in business to business transactions where the legal requirements are met and the contracting out is fair and properly recorded. If you also deal with consumers, you should be careful because statutory guarantees may still apply.

What if the client sends their own standard terms after receiving ours?

You should not assume your terms still apply. This needs to be resolved before work starts. If you proceed without clarifying the governing terms, you may end up accepting the client's document by conduct.

Key Takeaways

• Terms of trade for engineering firm work should do more than cover price and payment, they should allocate scope, variation, delay and liability risk clearly.
• Your terms should match the type of engineering services or products you actually supply, not generic wording borrowed from another business.
• Key clauses usually include scope, assumptions, client supplied information, variations, payment, delay, suspension, liability, intellectual property and termination.
• New Zealand businesses should make sure their terms also align with fair trading obligations, any relevant Consumer Guarantees Act issues, privacy practices and insurance settings.
• The practical risk is often not missing terms entirely, but failing to get them properly accepted before work starts or allowing the client's terms to take over.
• Regular review matters, especially if your firm is moving into higher value projects, repeat service agreements, online sales or software connected engineering offerings.

If you want help with scope and variation clauses, liability limits, payment terms, and customer contract negotiations, you can reach us on 0800 002 184 or team@sprintlaw.co.nz for a free, no-obligations chat.