How to negotiate with a builder in NSW

You can negotiate almost everything in a NSW home building contract before you sign it: the price, the inclusions, the allowances for prime cost items and provisional sums, the payment stages, the build time and the delay clauses. You can’t negotiate away the rules the Home Building Act 1989 sets for you, such as the 10% deposit cap, home building compensation (HBC) cover before any payment on work over $20,000, written and signed variations, and the statutory warranties.

By the BuilderVet team · Last reviewed 2 Nov 2026 · Sources checked 2 Nov 2026

This guide is general information, not legal advice. For a large build or a contract with special conditions, the NSW Government suggests getting legal advice before you sign.

What can you negotiate with a builder, and what’s fixed by law?

Most of a building contract is a commercial deal between you and the builder. A small part is set by NSW law, and no clause can change it. Knowing which is which stops you spending a negotiation on something that’s already yours.

Sources for this table are listed at the end of this guide, each checked on 2 Nov 2026.

What should you check on the public record before you negotiate?

Check who you are negotiating with before you spend time on the numbers. A good deal with the wrong entity is worth less than it looks. These checks take a few minutes on official registers, and our free builder check runs several of them in one place.

The licence holder is the business on the quote. Search the licence on Verify NSW. The NSW Government says a licence in an individual’s name doesn’t allow that person’s company or partnership to make the contract, even if the individual is a director. If the company is the contracting party, the company needs its own licence. Read the name on the licence, the name on the quote and the name on the draft contract. They should match.

The licence status and class. You want the status “Current” and a class that covers the work you’re hiring for. In NSW, residential building work over $5,000 needs a licence, and specialist work such as plumbing, electrical and gasfitting needs one at any value.

The ABN or ACN on the quote. Look it up on ABN Lookup and the ASIC registers. The number should belong to the licence holder, and the company should show as registered.

Regulator actions. Look for disciplinary records, fines, licence cancellations and building orders in the NSW Fair Trading online registers and the Building Commission NSW records. A record with a date gives you a specific, fair question to ask. It doesn’t tell you the outcome of an appeal or the full story.

HBC eligibility in practice. If your job is over $20,000, the builder will need HBC cover for your site before taking any money. You can see certificates already on record for an address with our HBC check (NSW only), or search the official HBC Check register. Certificates at other addresses show the builder has obtained cover before. They are not cover for your job.

Our step-by-step version of these checks is in How to check a NSW builder in 5 minutes. If the builder holds a licence in another state, see Check a builder licence in any Australian state.

How to read what you find

BuilderVet shows records and the date we read each one. We don’t rate builders, and a clean result isn’t a guarantee. Here is how we suggest using what the records show in a negotiation:

• A record with a date is a question, not a verdict. If a regulator action appears, ask the builder about it in writing and keep the answer.
• “No record found” means no match on the day. It doesn’t prove anything happened or didn’t happen.
• A name mismatch comes first. If the licence, the quote and the contract name different entities, sort that out before talking price. Every other term depends on who signs.
• Write down the source and the date. If something changes during the build, a dated record from before you signed is useful evidence.

How do you negotiate the price with a builder?

Negotiate the scope first and the price second. Most “discounts” that appear late in a negotiation come from something quietly leaving the inclusions list or moving into a provisional sum.

1. Get comparable quotes. Give two or three builders the same plans, the same specification and the same inclusions list. If they quote on different specs, you can’t compare the numbers.
2. Ask for an itemised breakdown. Ask what is fixed price, what is a PC item, what is a provisional sum and what is excluded. A quote with a large share of allowances isn’t really a fixed price yet.
3. Question an unusually low quote. The NSW Consumer Building Guide warns about a quote that is extremely low compared with others. It may mean the builder hasn’t understood the job, or that quality is being cut.
4. Ignore deadline pressure. The same guide warns about sales pitches that push you to sign quickly to avoid a price increase. A builder who won’t hold a price for a reasonable review period is telling you something about how variations will go later.
5. Trade, don’t just ask. Builders are more likely to move on price for something that helps them: a flexible start date, your own selections made early so they can order, or accepting a product they get a better rate on. Put whatever you agree in writing in the contract.
6. Check the price rise clause. On contracts over $20,000, the NSW Government says the builder can’t increase prices unless the contract contains a clause allowing it. If there is one, negotiate it: what triggers it, what it’s measured against, whether there’s a cap, and how much notice you get.

The NSW Government also notes that you have the right to ask for changes to a contract before you sign, and that you shouldn’t sign if you’re unhappy with it.

What should be on the inclusions list?

The inclusions list is where most later arguments start. The NSW Government suggests choosing fittings and appliances before you sign, and listing brand names and models where possible, so the prices quoted in the contract are accurate.

Ask for these in writing, attached to the contract:

• Every finish named. Tiles, flooring, benchtops, tapware, appliances, light fittings, joinery, paint. Write “brand, model, colour” rather than “standard” or “builder’s range”.
• Site works. Excavation, retaining, drainage, connection to services, and what happens if they find rock or poor soil.
• Approvals and fees. Who pays for development consent or a complying development certificate, and who engages and pays the certifier. In NSW the certifier is your responsibility, and it’s an offence for the contractor to unduly influence your choice.
• Exclusions. A list of what isn’t included is as useful as the inclusions. Driveways, fencing, landscaping, window coverings and clean-up are common gaps to ask about.
• Termite control. The NSW Government suggests checking that nothing in the contract makes you responsible for termite control instead of the builder.

Compare the lists from each builder line by line, not just the totals.

How do you negotiate prime cost items and provisional sums?

Prime cost (PC) items and provisional sums are allowances: amounts the builder puts into the price for things that can’t be costed exactly when you sign. They’re the most common reason a “fixed” price grows.

Prime cost items are things you choose after you sign, such as a stove or special fittings. The NSW Government says these are listed as PC items in the contract and the builder should allow a price that covers their expected cost.

Provisional sums are allowances for work that can’t be priced exactly yet, such as excavation where the ground conditions aren’t known. They usually cover labour and materials.

How to negotiate them:

• Reduce the number of allowances. Every item you can select before signing becomes a fixed price instead of an allowance.
• Test each allowance against a real quote. If the tapware allowance is lower than any tapware you would actually choose, the contract price is understated. Ask the builder to raise the allowance to a realistic number, or get a supplier quote yourself.
• Ask how overruns are charged. Ask the builder to show you, in the contract, how the price changes if the actual cost is above or below the allowance, and whether a margin is added to any overrun. Get the margin percentage written in.
• Ask for evidence. Agree that any adjustment comes with the supplier invoice or receipt.
• Add up the allowances. Total the PC items and provisional sums and look at them as a share of the contract price. The larger that share, the less certain your final price is.

How do you negotiate the payment schedule?

You can negotiate how many stages there are and how much each one is, within the rules. You can’t negotiate a larger deposit than the law allows, and you can’t agree to pay before HBC cover is in place on a job that needs it.

What NSW law and the NSW Government say:

• Deposit. The maximum deposit you can be asked to pay before work starts is 10% of the contract price. You can agree to less. Our deposits and progress payments guide covers the detail.
• HBC first. For work that needs HBC cover, it’s illegal for the contractor to ask for a deposit or any other payment under the contract until the cover is in place and you’ve been given the certificate.
• Schedule required. All contracts over $20,000 must have a progress payment schedule.
• What the schedule can contain. Fixed payments after specified stages of work, described in plain language and set as an amount or a percentage of the contract price; or payments as work is done and costs are incurred, supported by invoices, receipts or other documents; or a mix of the two.
• Work done, not time on the job. The NSW Government says progress payments should be for work actually done and not time on the job, and that the dollar value on each stage should be realistic.

Negotiating points that stay within those rules:

• Front-loading. Compare each stage payment with the work it pays for. If the early stages ask for a much larger share of the price than the share of work done, ask for the money to move to later stages.
• Plain-language stage definitions. “Frame complete” is clearer than “stage 3”. Ask for each stage to say what must be finished and how you’ll confirm it.
• Independent inspections. The NSW Government suggests considering a progress inspection by an independent building consultant or architect before each payment, and gives $250 to $500 per inspection as a guide. Ask for the right to inspect before each stage payment to be written into the contract.
• Your lender. Check with your bank about its requirements for progress payments before you agree the schedule, so the two match.
• Upfront fees for plans. The NSW Government notes builders often seek a separate agreement and upfront payment for plans before the building contract. This payment is generally not covered by HBC cover. Keep it small, and ask whether it’s credited against the contract price.

How do you handle variations?

A variation is a change to what you’ve already agreed. You can negotiate the price and timing of each one. The process for agreeing it is set.

The NSW Government says:

• variations must be in writing, attached to the contract, and signed by you and the builder (or their nominated supervisor or agent)
• the document must explain the cost of the variation and its effect on the overall contract price, showing the calculation rather than a single dollar figure
• before work on a variation starts, the builder should give you a written description of the work, any plans or specifications, the extra cost and any extra time
• if the variation is needed because of the builder’s fault, you don’t have to pay for extra work to fix the problem
• where there is likely danger to someone or damage to property, the written variation can be done after the work

What to negotiate before you sign:

• A variation form in the contract, with fields for the description, the price calculation, the time impact and both signatures.
• The margin on variations. Ask what margin the builder adds to variations and write it in.
• No work before signature, except in the safety situations above.
• Credits for deletions. Ask for removed work to be credited using the same method as additions.

How do you negotiate the build time and delay clauses?

Build time is negotiable, and the NSW Government suggests talking about the timeframe and budget before you sign and adding reasonable allowances to the start and finish dates.

What the NSW Government says about delays:

• if the builder agrees, you can add clauses such as a time limit for construction and procedures to follow if there is a delay
• if the builder can’t meet the deadline, they’d need to ask you for an extension of time, and if they don’t, you could be owed money for damages or breach of contract
• if the builder asks for an extension, they should tell you why, and you should check the contract’s delay clauses before agreeing
• during delays, you should keep paying as agreed in the contract, and only for work that has been completed

What to negotiate:

• A clear start date and a building period, in days or weeks, with a definition of what counts as “started”.
• What allows an extension. Ask which causes allow an extension of time, how and when the builder must notify you, and how you can dispute it.
• A daily amount for late completion. Some standard contracts include a daily amount the builder pays if they finish late without an agreed extension. If yours does, the figure is negotiable. If it’s blank, ask what applies.

What can’t you negotiate away?

Some protections apply whatever the contract says. If a draft contract tries to change them, that’s a reason to stop and get advice.

• The 10% deposit cap. A deposit above 10% isn’t allowed for NSW residential building work, and the NSW Government says any amount above 10% may not be recoverable under HBC cover.
• HBC cover before payment. On work that needs it, no deposit or payment until the cover is in place and you hold the certificate.
• Statutory warranties. These apply even if they’re not written into the contract. They include work done with due care and skill, materials that are suitable and new unless otherwise stated, work that complies with the law, and work done with due diligence and within the contract time or a reasonable time. Legal action on them must start within 6 years for major defects and 2 years for other defects.
• Written, signed variations.
• The cooling-off period on contracts over $20,000, which the contract must state.
• No arbitration clause. The NSW Government says these aren’t permitted in a home building contract and are void.
• A copy of the signed contract within five business days after you sign.

A negotiation script you can use

Send it by email so you have a dated record. Change the details to suit your job.

Hi [name],

Thanks for the quote dated [date]. Before we go further, can you confirm a few things in writing:

1. The contracting party will be [entity name], ABN/ACN [number], licence [number]. That’s the name I see on the licence register.
2. Can you send an itemised breakdown showing fixed-price items, prime cost items, provisional sums and exclusions?
3. For each PC item and provisional sum, what does the allowance cover, and how is the price adjusted, including any margin, if the actual cost differs?
4. I’d like to fix [list of items] now so they’re priced, not allowances.
5. Please propose a payment schedule tied to completed stages of work, with each stage described. I’ll pay no deposit until I have the HBC certificate for this address, and the deposit will be no more than [agreed]% of the contract price, and never more than 10%.
6. What building period are you offering, what can extend it, and what daily amount applies if it runs late without an agreed extension?
7. Does the contract allow the price to rise? If so, on what basis, and is there a cap?
8. I’d like the right to have an independent inspector check the work before each stage payment.

I’m happy to talk through any of this. I’ll have the contract reviewed before I sign.

Thanks, [your name]

Checklist before you sign

• The licence is “Current” and its class covers the work
• The licence holder, the quote and the contract name the same entity
• The ABN or ACN matches the licence holder, and the company is registered
• You’ve asked about any regulator record you found, and kept the answer
• You’ve received the Consumer Building Guide (required for contracts over $5,000)
• The contract price is on the first page, with a warning if it can change
• Plans, specifications and a named inclusions list are attached
• Every PC item and provisional sum has a realistic allowance and a written adjustment method
• The deposit is 10% or less, and payable only after you hold the HBC certificate
• You’ve confirmed the HBC certificate names your builder and your address, on HBC Check or with the insurer
• The payment schedule is tied to described stages of work, not time
• There’s a variation process with written, signed, priced variations
• There’s a start date, a building period and a written extension of time process
• Any price rise clause is understood and, if possible, capped
• There’s no arbitration clause
• You know the cooling-off period and when it ends
• You’ve had independent advice on any special conditions

Keeping watch after you sign

Most negotiations end at signing, but the builder’s records can change during a build that runs for months. If you want a dated record of what the registers showed when you signed, and a notice when the licence, ASIC company status or a NSW regulator record changes, Build Watch does that for one NSW builder for A$79 once. It covers 24 months of change notices from deposit to handover. It doesn’t certify a builder or predict financial trouble.

Check a builder free: licence, company and NSW regulator records, with the source and date for each. BuilderVet is free to search for NSW and QLD builders.

Frequently asked questions

Can you negotiate with a builder on price in NSW?

Yes. The contract price is a commercial term and you can negotiate it before you sign. Compare quotes on the same plans and inclusions, ask for an itemised breakdown, and check whether a lower price comes from items moving into allowances. On contracts over $20,000, the builder can’t raise the price later unless the contract has a clause allowing it.

What is the maximum deposit a builder can ask for in NSW?

10% of the contract price. You can agree to pay less. For work that needs home building compensation cover, the builder can’t ask for any deposit or other payment until the cover is in place and you’ve been given the certificate.

What is the difference between a prime cost item and a provisional sum?

A prime cost item is an allowance for something you’ll choose after signing, such as an appliance or fitting. A provisional sum is an allowance for work that can’t be priced exactly yet, such as excavation. Both can change the final price, so check each allowance against a real quote and get the adjustment method written into the contract.

Can a builder charge for a variation I didn’t sign?

In NSW, variations must be in writing and signed by both parties, with the cost impact explained. The exception the NSW Government gives is urgent work where there’s likely danger to someone or damage to property, where the written variation can be done afterwards. If a variation is needed because of the builder’s fault, you don’t have to pay for the extra work.

Can I negotiate the progress payment schedule?

Yes, within limits. Contracts over $20,000 must have a schedule, and it can only include fixed payments after described stages of work, payments for work done backed by invoices or receipts, or a mix. Payments should match work actually done, not time on the job.

What happens if my builder finishes late in NSW?

Check the contract’s delay and extension of time clauses. The NSW Government says if the builder can’t meet the contract deadline they’d need to ask you for an extension, and if they don’t and you haven’t agreed one, you could be owed money for damages or breach of contract. Get independent advice before withholding any payment.

Can I add my own clauses to a NSW building contract?

Yes, if the builder agrees. The NSW Government gives a construction time limit and a delay procedure as examples, and says you have the right to ask for changes before you sign. It suggests getting legal advice before changing a standard contract or agreeing to special conditions.

Does a clean BuilderVet check mean the builder is safe to sign with?

No. We show public records and the date we read each one. A clean result means no matching record was found on that day. It doesn’t predict how a build will go, so still check the contract, the HBC certificate and the payment schedule.

Is there a cooling-off period on a NSW building contract?

For contracts over $20,000, the contract must set out a cooling-off period of five clear business days after you’re given a copy of the contract.

Sources

All checked on 2 Nov 2026.

1. NSW Government, Contracts for residential building work (last updated 29 Apr 2026): https://www.nsw.gov.au/housing-and-construction/building-or-renovating-a-home/preparing/contracts
2. Building Commission NSW, Consumer Building Guide (version 2025): https://www.nsw.gov.au/housing-and-construction/compliance-and-regulation/your-obligations-to-your-customers/how-to-use-consumer-building-guide/guide
3. NSW Government, Home building delays in NSW: https://www.nsw.gov.au/housing-and-construction/building-or-renovating-a-home/building-delays
4. NSW Government, Protecting yourself in case of builder insolvency (last updated 1 Sep 2026): https://www.nsw.gov.au/housing-and-construction/building-or-renovating-a-home/protecting-yourself-case-of-builder-insolvency
5. icare, What is icare HBCF and why do I need it?: https://www.icare.nsw.gov.au/builders-and-homeowners/homeowners/what-is-icare-hbcf
6. Service NSW, Use the Home Building Compensation (HBC) Check: https://www.service.nsw.gov.au/transaction/use-the-hbc-check
7. Verify NSW licence register: https://verify.licence.nsw.gov.au/
8. NSW Government, Resolving building disputes with your builder or tradesperson: https://www.nsw.gov.au/housing-and-construction/building-or-renovating-a-home/resolving-building-disputes

Last reviewed 2 Nov 2026