What Are the Different Types of Building Contracts Recognised Under QLD Law?

Oct 6

7 min read

Before a single brick is laid, a building contract sets the terms for everything that follows: price, scope, timeframes, defects, and what happens if something goes wrong. In Queensland, not every building contract looks the same, and the type of contract you're working under can significantly affect your rights if a dispute arises.

Whether you're a homeowner planning a renovation, a builder tendering for commercial work, or a subcontractor signing on to a project, understanding which category your contract falls into and what Queensland law requires of it is the first step in protecting your position. This blog breaks down the different types of building contracts recognised under Queensland law, including the legislation that governs them and the practical issues that most commonly trigger disputes.

Why the Type of Building Contract Matters

Queensland regulates building work more tightly than most people expect. The contract type determines which statutory warranties apply, what disclosure a builder must give, the cooling-off period (if any), and how a dispute is resolved.

Getting the contract type wrong, or using an ill-suited standard form for a non-standard project, is a common source of building disputes. Builders, developers and homeowners alike often only discover the gaps in their contract once a dispute is already underway, which is why our construction lawyers in Brisbane recommend a contract review before, not after, signing.

The Legal Framework: QBCC Act and the BIF Act

Two pieces of legislation sit behind almost every building contract in Queensland:

The Queensland Building and Construction Commission Act 1991 (QBCC Act) - sets out the licensing regime, mandatory contract content, implied statutory warranties, and the two-tier system for regulated domestic building contracts (Schedule 1B).
The Building Industry Fairness (Security of Payment) Act 2017 (BIF Act) - governs progress payments, payment claims, adjudication, and subcontractors' charges.

Any building work valued at more than $3,300 in Queensland requires a written contract. Below that threshold, a written contract isn't legally mandatory, but it's still the safest option for both parties.

1. Domestic (Residential) Building Contracts

Domestic building contracts cover work such as constructing a new detached dwelling or duplex, renovating, extending or repairing a home, and associated work like pools, driveways, carports and fencing. Under Schedule 1B of the QBCC Act, these contracts are split into two regulated levels based on price.

Level 1 Regulated Contracts ($3,301–$19,999)

Level 1 contracts must be in writing, dated, and signed by both parties. They must include the builder's licence number, a description of the work, the contract price, the date (or method of calculating the date) for practical completion, copies of plans and specifications, notice of the owner's cooling-off rights, and clear identification of the site.

Level 2 Regulated Contracts ($20,000 and above)

Level 2 contracts carry everything required for a Level 1 contract, plus additional protections given the higher stakes involved: a prominent price change warning on the first page of the contract schedule, the QBCC Consumer Building Guide provided to the owner before signing, a stated start date (or how it's determined), and a Commencement Notice provided within 10 business days of work starting on site.

Minor Works (Under $3,300)

For very small jobs under the $3,300 threshold, a written contract isn't legally required, but disputes over scope and payment on "handshake deal" minor works are still common, and a simple written agreement remains good practice.

Every regulated domestic contract also carries implied statutory warranties that materials will be new and fit for purpose, work will comply with the law and the plans, work will be carried out with reasonable care, skill and diligence, and the finished home will be suitable for occupation. Breach of these warranties triggers different limitation periods depending on whether the issue is a structural defect (six years) or a non-structural one (one year). Homeowners relying on these protections should also understand how the Queensland Home Warranty Scheme interacts with a builder's insolvency or failure to rectify; we've covered this in detail in our article on the Home Warranty Scheme. If you're preparing to sign a residential contract, our guide on how to create a residential building contract in QLD that meets QBCC requirements walks through what a compliant contract needs to include.

2. Commercial Building Contracts

Commercial building contracts cover work carried out or managed for developers, builders and subcontractors on non-residential projects, office fit-outs, retail developments, industrial builds and larger multi-unit projects. They aren't subject to the same Schedule 1B regulated contract levels as domestic work, but timing rules still apply: for projects priced above $10,000, a contract must be signed before work begins; for projects at or below that figure, it must be signed before the work is finished.

Commercial contracts typically involve more complex risk allocation than their domestic counterparts; retentions, security, extensions of time, liquidated damages, indemnities, and insurance obligations tend to be negotiated more heavily. Because the parties are usually sophisticated and the sums involved are larger, disputes are more often resolved through commercial negotiation or litigation rather than the QBCC's consumer-focused pathways. Our commercial litigation team regularly advises developers, head contractors and subcontractors on exactly this kind of dispute.

3. Standard Form Contracts Used in Queensland

Rather than drafting from scratch, most Queensland building projects use a recognised standard form contract, amended to suit the specific job. The main options include:

QBCC standard contracts: commonly used for domestic new home construction and renovations, drafted to comply with Schedule 1B requirements.
Housing Industry Association (HIA) Queensland contracts: a widely used alternative for residential and light commercial building work.
Master Builders Queensland contracts: another common residential and commercial industry form.
Australian Standard (AS) contracts: including AS4000, AS4300 and AS2124, generally used for larger commercial, civil and infrastructure projects.

There are also purpose-built standard forms for renovations and extensions, subcontracting, natural disaster repairs, demolition work, and small building projects. Standard forms are useful because they're familiar to industry participants. However, they are rarely a perfect fit "off the shelf", most still need amendments to reflect the specific project, and the party who drafted the standard form (often the builder's industry association) tends to weigh it in their own favour. A contract review before signing is the cheapest insurance most builders and owners will ever buy.

4. Contracts by Pricing Structure

Beyond the domestic/commercial split, building contracts in Queensland are also commonly categorised by how the price is calculated, a distinction that matters enormously when a dispute over cost overruns arises.

Fixed price (lump sum) contracts: The builder quotes a single price for the defined scope of work. These offer cost certainty but shift risk onto the builder for unforeseen conditions, unless the contract allows for specific variations.
Cost-plus contracts: The owner pays the actual cost of labour and materials plus a builder's margin. These offer flexibility for projects where scope isn't fully defined upfront, but expose the owner to open-ended cost risk if the contract doesn't cap spending.
Guaranteed maximum price (GMP) contracts: A hybrid model, often used on larger commercial projects, where costs are passed through up to an agreed ceiling, giving the owner some of the flexibility of cost-plus with a cap on total exposure.

Disputes over pricing structure, particularly what counts as a legitimate variation versus a builder simply underquoting, are one of the most frequent triggers for building litigation in Queensland.

5. Contracts by Delivery Method

Larger and more complex Queensland projects are often structured around how the work is delivered and managed, rather than just how it's priced:

Construction management contracts: the owner engages a construction manager (in addition to, or instead of, a single head contractor) who coordinates multiple trade contractors directly engaged by the owner.
Design and construct contracts: a single contractor takes responsibility for both design and construction, giving the owner one point of contact but less direct control over design decisions.
Novated contracts: commonly used where an owner initially engages a design consultant directly, then "novates" that consultant's engagement across to the building contractor once construction begins, transferring the consultant's obligations to the builder.

6. Subcontracts and the Security of Payment Regime

Subcontracts sit underneath the head contract and are subject to their own set of protections under the BIF Act, including the statutory right to make payment claims, pursue adjudication for unpaid progress claims, and in some circumstances, lodge a subcontractor's charge over money owed to the contractor above them. Subcontractors who don't understand how the Security of Payment regime interacts with their specific contract terms often miss critical deadlines for making a valid payment claim or adjudication application, which can be fatal to an otherwise legitimate claim.

Common Building Contract Disputes We See in Queensland

Regardless of contract type, most building disputes in Queensland trace back to a handful of recurring issues:

Ambiguous or missing variation clauses, leading to disagreement over extra costs
Disputes over what constitutes "practical completion" and when defects liability periods start
Unpaid progress claims and disputes over the Security of Payment adjudication process
Defective or incomplete work claims, including Directions to Rectify issued by the QBCC
Contracts that don't clearly allocate risk for delays, site conditions, or price escalation

Because the applicable warranties, notice periods and dispute pathways differ depending on the contract type, the first question in almost any building dispute is: what kind of contract are we actually dealing with, and does it comply with the QBCC Act and BIF Act? Getting early advice on QBCC disputes or broader construction dispute resolution options can materially change the outcome.

FAQs

Do I need a written building contract in Queensland?

Any building work valued over $3,300 legally requires a written contract. For anything below that threshold, a written agreement is still strongly recommended.

What's the difference between a Level 1 and Level 2 regulated contract?

Level 1 applies to domestic work priced between $3,301 and $19,999. Level 2 applies to work priced at $20,000 or more and carries extra requirements, including a Commencement Notice and a prominent price change warning.

Can I use a standard form contract without amendments?

You can, but standard forms are rarely a perfect fit. Most benefit from amendments to reflect the specific project, and it's worth having a construction lawyer review the terms before signing.

What should I do if I think my building contract doesn't comply with the QBCC Act?

Get advice as early as possible. Non-compliant contract terms can affect your rights in a dispute, and some issues are far easier to fix before work starts than after.

Need Advice on a Building Contract or Dispute?

Whether you're reviewing a contract before you sign, or already dealing with a dispute over defective work, unpaid claims or a QBCC notice, the team at Roberts Litigation has deep experience across every type of building contract recognised under Queensland law. Contact our litigation team today for an obligation-free consultation.