Can a Business Change a Quote in New Zealand?

A fixed quote can turn into a margin problem fast. A subcontractor increases their rate, timber costs jump, the client asks for extra work on site, or your team discovers that the job is bigger than expected. The hard question is whether you can pass that cost on after the customer has already accepted your price.

Many New Zealand businesses get into trouble by calling an estimate a quote, starting variation work without written approval, or advertising a low price that does not reflect what customers will realistically pay. Those mistakes can create contract disputes and Fair Trading Act pricing risks.

The right answer depends on what you promised, what your written terms of trade say, how the customer approved the job, and whether the extra cost is genuinely outside the original scope. With clear wording and a practical approval process, you can protect your margin without surprising customers.

Quote vs Estimate in New Zealand

A quote is usually a firm offer to do defined work for a stated price, while an estimate is an informed approximation that may change once the job is scoped properly.

The label you use matters, but it is not the only thing that matters. A document headed estimate can still look like a fixed price promise if it gives a specific scope, fixed amount and acceptance process. A document headed quote may still allow price changes if it clearly states the assumptions, exclusions and variation process.

For a quote to become binding, there generally needs to be an offer, acceptance, consideration and an intention to create legal relations. In practical terms, that might happen when a customer signs your quote, clicks accept in your job management system, replies by email saying to go ahead, pays a deposit, or lets you start work after you have provided the quote.

The phrase quote vs estimate NZ often comes up for trades and service businesses because customers may use both words casually. Your documents should not. If the price is fixed for the stated scope, call it a quote. If the price may move because you need to inspect the site, confirm quantities, or wait for supplier pricing, call it an estimate and say why.

A clear quote should usually set out:

• The specific goods, services or works included in the price.
• What is excluded, such as permits, after-hours work, freight, waste removal, travel, access equipment or third-party charges.
• Any assumptions, such as normal ground conditions, available power, accurate plans, or customer-supplied measurements.
• How long the quote remains open for acceptance.
• Whether prices include or exclude GST.
• How variations, provisional items and unexpected costs will be handled.
• Payment timing, deposits, progress claims and late payment consequences.

An estimate should be just as clear, but it should avoid language that sounds final. For example, a plumber might say that replacing pipework is estimated at $2,800 to $3,400, subject to opening the wall cavity and confirming the pipe route. A software consultant might estimate a build in a statement of work at 80 to 120 hours, subject to final acceptance criteria and integrations being confirmed.

Problems usually start when the customer hears one thing and your team assumes another. A homeowner might believe the kitchen installation was fixed at $18,000. Your project manager might believe it was always subject to a benchtop supplier confirming final measurements. If your quote did not say that, it becomes much harder to justify a later increase.

For business customers, the customer contract wording often carries more weight because both sides are expected to manage commercial risk. For consumer customers, the Consumer Guarantees Act 1993 and the Fair Trading Act 1986 can affect how pricing promises are assessed, especially if the customer was led to expect a firm price.

When You Can Charge More Than the Original Price

You can usually charge more after a quote if the extra charge is allowed by the contract, the customer agrees to a variation, or the extra work falls outside the original scope.

The safest position is written approval before you do the additional work or order the additional materials. That approval can be a signed variation form, an email, a text message, a purchase order, or confirmation through your project software. The key is that the customer knows what is changing, why it is changing and how much it will cost.

A price increase after quote is more likely to be valid where:

• The customer changes the brief, specifications, plans, quantities or timing.
• The site conditions differ from what was reasonably visible or disclosed when you quoted.
• The original quote included provisional sums or prime cost items that are later finalised.
• A supplier or freight cost changes and your contract clearly allows that cost to be passed on.
• The customer delays the work and your quote stated that prices are only fixed for a set acceptance or commencement period.
• The work is emergency work and the customer has authorised you to proceed on a time and materials basis.

For example, an electrician quotes to install lighting based on provided plans. Once on site, the client asks for additional exterior lights and smart switches. That is a variation. The electrician should price the additional work and get approval before installing the extra items.

Another example is a landscaper quoting based on normal soil conditions. Excavation reveals buried concrete that could not reasonably have been identified without digging. If the quote excluded hidden ground conditions or allowed variations for unexpected site issues, the landscaper is in a stronger position to charge for the additional machinery and labour.

There is a difference between a genuine variation and an underquoted job. If you simply underestimated labour hours, forgot to include a component, or priced your margin too low, the customer may not have to pay more. A quote is not usually adjustable just because the job is less profitable than expected.

If no price was agreed for extra services, the Consumer Guarantees Act 1993 may be relevant for consumer transactions. Where a consumer has not agreed on a price for services, there are rules around paying a reasonable price. That does not give businesses a free hand to charge anything; the amount should be supportable by time records, supplier invoices, market rates and the work actually performed.

For business-to-business work, your terms may exclude or limit some consumer-style protections where the law allows and the requirements are met. For example, where the Consumer Guarantees Act would otherwise apply, parties can only contract out in limited business transactions. The contracting-out term should be in a written agreement, the goods or services must be acquired for business purposes and supplied and acquired in trade, and it must be fair and reasonable for the parties to be bound by the term. That kind of clause needs careful drafting and should not be copied blindly from another business.

Timing also matters. Asking for approval after the extra work is finished is risky. The customer may say they would have declined, found a cheaper supplier, reduced the scope or asked for evidence.

A simple rule for your team is useful: no approved variation, no extra work, unless there is a genuine safety or emergency reason to proceed.

Fair Trading Act Pricing Risks

The Fair Trading Act 1986 makes misleading pricing a serious issue, especially where a customer is led to believe a price is fixed, complete or available when it is not.

Fair trading act pricing issues can arise even before a contract is signed. The Act applies to conduct in trade and is enforced by the Commerce Commission. It prohibits misleading or deceptive conduct, false or misleading representations, and unfair sales practices. For a business owner, the practical message is simple: your advertised prices, quotes, invoices and sales conversations should match what you are actually prepared to supply.

Common pricing risks include:

• Advertising a headline price that most customers cannot realistically obtain.
• Describing a quote as fixed while reserving a broad right to change it without clear limits.
• Failing to state that GST, freight, travel, disposal, booking fees or third-party charges are extra.
• Using a low estimate or unclear customer terms to win the job when you know the final price is likely to be materially higher.
• Charging for variations the customer did not request or approve.
• Adding a surcharge or administration fee that was not clearly disclosed before acceptance.

For example, a garage door business advertises installation from $1,999. If almost every ordinary installation needs extra tracks, freight and labour that lift the price to $2,800, the advertisement may create a misleading impression unless the limits are made clear. A low starting price is not automatically unlawful, but the customer should not be drawn in by a price that does not reflect the usual offer.

Quotes can also become misleading through silence. If you know that steel prices are volatile and your supplier will only hold pricing for five days, do not provide a 30-day fixed quote without explaining the condition. If you know that scaffolding may be needed for most two-storey jobs, do not bury that cost until the invoice stage.

Digital quoting tools can create their own risks. A website calculator, booking form or instant estimate should say whether the figure is binding, indicative or subject to inspection. If your system automatically sends a price that staff later change, your process should explain when and how final pricing is confirmed.

The Fair Trading Act also matters when dealing with other businesses. A trade customer can still be misled. If your quote is for a commercial fit-out, the customer may have their own deadlines, budgets and client obligations. A surprise increase can cause real commercial loss and damage the relationship, even if the legal position is arguable.

Your internal sales process should support your legal documents. Train staff not to say that is definitely all-inclusive unless it truly is. If a cost is provisional, staff should use consistent language such as this allowance may change once final measurements are confirmed. Your quote template, emails, scripts and invoices should tell the same pricing story.

Variation Clauses and Materials Price Increases

A well drafted variation clause in a New Zealand contract gives you a process for changing price, scope and timing without arguing from scratch every time something changes.

A variation clause contract NZ approach is especially useful for builders, tradies, manufacturers, wholesalers, agencies, consultants and IT providers. It turns a stressful conversation into an agreed procedure. Instead of saying we need to charge more, you can say this is a variation under our agreed terms, here is the reason, price impact and approval request.

A practical variation clause should cover:

• What counts as a variation, including customer changes, additional work, site conditions, specification changes and third-party cost changes.
• Who can approve a variation for the customer and your business.
• Whether approval must be in writing, and what forms of written approval count.
• How variations will be priced, such as fixed price, time and materials, cost plus margin, or agreed rates.
• How variations affect project timelines, delivery dates and milestones.
• What happens if urgent work is needed to protect safety, property or the project.
• Whether you can suspend additional work until approval is received.

Materials price increases need careful wording because they sit somewhere between ordinary business risk and genuine market volatility. If you promise a fixed price for six months, the customer may expect you to absorb supplier increases. If your quote says pricing is subject to supplier confirmation, exchange rate movements or increases in specified inputs, you have a clearer basis to adjust the price.

Clauses that allow price increases should not be so broad that they feel unfair or misleading. A term saying you can change any price at any time for any reason may be hard to rely on, and it can damage trust. Better wording identifies the triggers, the evidence you will provide and the customer's options.

For example, a joinery business might include a clause stating that timber, hardware and benchtop prices are fixed only to the extent suppliers hold their prices, and any supplier increase after the quote date may be passed on with supporting evidence before the relevant order is placed. The customer can then decide whether to approve, choose an alternative product, or adjust the scope.

A supplier business might use a clause that allows price changes for foreign exchange movements, freight increases or manufacturer price updates before dispatch, provided the customer is notified before the order is fulfilled. The clause should fit how your business actually buys and supplies goods.

For construction work, your quote or contract should be aligned with the way the project will be managed. Larger jobs may need detailed schedules, progress claims, retention wording, insurance requirements, health and safety obligations, and a clear process for variations. Smaller residential-style jobs still need plain language that a customer can follow. If the client is a consumer, transparency is especially important.

There are also practical records to keep. Save supplier notices, screenshots of updated material pricing, emails approving substitutions, site photos, signed scope changes and time records. If a dispute arises six weeks later, the business with clear records usually has a much easier conversation.

Your invoices should match the variation process. Rather than adding a vague line for extra materials, identify the variation number or date, describe the work and attach the approval if needed. That makes it easier for accounts teams, project managers and customers to reconcile what was agreed.

How to Set Up a Price Change Process

A reliable price change process combines clear documents, trained staff and a habit of pausing work until the customer approves changes.

Start with your quote template. It should be easy to read, not just legally protective. Customers are more likely to accept a variation later if they understood the assumptions at the beginning. Put high-risk pricing terms near the price, not hidden at the end of dense terms.

A strong workflow can look like this:

1. Scope the job carefully. Gather measurements, plans, photos, specifications and customer requirements before pricing.
2. State the price basis. Say whether the price is fixed, estimated, provisional, subject to inspection, or based on time and materials.
3. List assumptions and exclusions. Include the items that often cause disputes in your industry.
4. Set the quote validity period. Make clear how long the customer has to accept and whether supplier prices must still be available.
5. Use a written variation form. Record the reason for the change, the added or reduced price, and any timing impact.
6. Get approval before proceeding. Make approval part of your project management process, not a legal afterthought.
7. Invoice in line with approvals. Match each extra charge to an approved variation or clear contractual right.

Service businesses should also decide who has authority to approve changes. If a staff member on site casually agrees to do extra work, but the customer thinks it is included, the dispute may become a credibility issue. A policy that only certain people can approve unpaid extras or price changes can prevent confusion.

On the customer side, identify the decision-maker. A tenant, site contact, office manager or junior employee may not have authority to approve additional charges. For business clients, ask for a purchase order or written confirmation from the person named in the contract. For consumers, make the approval request clear and simple.

Deposits and progress payments can also help manage risk. If you order custom materials before receiving a deposit or signed acceptance, you may be exposed if the customer cancels or rejects a price change. Your terms should say when deposits are due, whether they are refundable, and what happens to special-order items.

Cancellation wording is worth considering where price increases are possible. If a customer does not accept a legitimate price adjustment, can either party cancel the affected work? Will the customer pay for work already performed, materials already ordered, or restocking fees? Clear terms give both sides a fair exit path.

Do not forget your online checkout, proposal software or booking platform. If customers accept work digitally, your standard terms should be presented before acceptance and your records should show what version applied. In New Zealand, electronic contracting is common, but you still need a clear acceptance trail.

A common mistake is relying on a single line such as prices subject to change. That phrase may help, but it is rarely enough on its own. It does not say when prices can change, how much notice the customer gets, what evidence you will provide, or whether the customer can decline the change.

Another mistake is treating long-standing customers too casually. Repeat customers can still dispute unexpected increases, especially when their own budgets are under pressure. A friendly relationship is not a substitute for written scope and variation approval.

FAQs

Can a Business Change a Quote in New Zealand After It Has Been Accepted?

Yes, but usually only if the contract allows it, the customer agrees to a variation, or the additional charge relates to work outside the accepted scope. If the quote was a fixed price for defined work and none of those apply, increasing the price can be difficult.

Can I Pass on Materials Price Increases After Giving a Quote?

You are in a stronger position if your quote says that specified materials are subject to supplier price changes and explains how those increases will be passed on. Without that wording, a customer may argue that material cost risk was already built into your fixed price.

Is an Estimate Binding Like a Quote?

An estimate is usually less fixed than a quote, but the wording and circumstances matter. If your estimate looks precise, has a defined scope and is accepted like a final price, a customer may argue it operated like a quote. Use ranges, assumptions and subject-to wording where the price is genuinely uncertain.

Do I Need Written Approval for Every Variation?

Written approval is the safest approach, especially for extra charges. The writing does not always need to be formal, but it should clearly show the changed work, price impact and customer approval. Email, text or project software approval can be useful if your terms allow it.

What If the Customer Refuses to Pay for Extra Work?

Start by checking the accepted quote, any terms and conditions, and the evidence of approval. If the work was outside scope but not approved, recovery may be harder. For future jobs, use a variation process that stops extra work from starting until the price change is agreed.

Key Takeaways

• A quote is usually treated as a firm price for a defined scope once accepted, while an estimate should be clearly marked as approximate and subject to stated assumptions.
• You can often charge more where the customer requests extra work, site conditions change, supplier costs increase under a clear clause, or the contract allows a variation.
• Misleading pricing can create Fair Trading Act 1986 risk, especially where headline prices, exclusions, surcharges or later increases are not disclosed clearly.
• A useful variation clause should explain what counts as a variation, who can approve it, how it is priced and how it affects timing.
• Good records, including supplier notices, approval emails, signed variations and itemised invoices, make price change conversations easier to resolve.
• A vague statement that prices may change is usually weaker than a tailored process that fits how your business quotes, orders materials and delivers work.

If your quotes are exposing you to margin pressure or customer disputes, Sprintlaw can help with your quote terms, variation wording, service agreement and supplier contract settings. Contact us on 0800 002 184 or team@sprintlaw.co.nz for a free, no-obligations chat.