Building Contracts in Tasmania: What You Must Know Before You Sign

Before a single piece of timber goes up on your new home, you'll sign a building contract. In Tasmania, residential building contracts are governed by the Residential Building Work Contracts and Dispute Resolution Act 2016, which sets out what must be in your contract, caps your deposit, gives you a cooling-off right, and spells out your statutory warranty entitlements. Understanding what you're signing protects you throughout the build — and matters most if something goes wrong.

What Law Governs Your Building Contract?

The Residential Building Work Contracts and Dispute Resolution Act 2016 (Tas) applies to any residential building work contract worth $20,000 or more. It covers new homes, renovations, extensions, alterations, and conversions of non-residential buildings. Companion legislation includes the Building Act 2016 (the technical and licensing framework) and the Building and Construction Industry Security of Payment Act 2009 (which protects a builder's right to progress payments and, indirectly, your interest in not being asked to pay everything upfront).

Consumer, Building and Occupational Services (CBOS) is the regulator. They administer the Act, license builders, publish consumer guidance, and handle disputes before they escalate to the Tasmanian Civil and Administrative Tribunal (TASCAT).

Types of Building Contracts

Fixed-Price (Lump Sum) Contract

The builder agrees to complete the project for a predetermined total price covering all labour, materials, and overhead. This is the most common contract type for residential new builds in Tasmania, and the one that gives owners the greatest cost certainty. However, read the fine print: some "fixed-price" contracts include price escalation clauses that allow the builder to increase the price if material costs rise beyond a defined threshold. If your contract contains one, understand exactly what triggers it and how the adjustment is calculated.

Cost-Plus Contract

The owner pays all actual costs — labour, materials, subcontractors — plus a builder's margin, typically expressed as a percentage (commonly 15–25%). Cost-plus is used where a fixed price cannot be determined at the time of contracting: highly complex projects, remote sites, or builds where the scope isn't fully defined. The risk for the owner is that there is no price ceiling unless the contract specifies a guaranteed maximum. Under the Act, cost-plus contracts must be in writing and must specify: the scope of work, how costs are defined and calculated, the markup percentage, the progress payment schedule, variation procedures, and warranty obligations.

What Your Contract Must Include

Under the Act and the Director's Determination on Mandatory Contract Provisions, a residential building contract for $20,000 or more must:

• Be in writing, dated, and signed by both parties before work begins
• Include the builder's licence number under the Occupational Licensing Act
• Include a clear description of the work, including plans and specifications — vague descriptions are a leading cause of disputes
• Specify the contract price or a fair and reasonable estimate, with the method of calculation
• Specify the date of practical completion or the method for determining it
• Include a progress payment schedule linked to defined completion milestones
• Include variation procedures — how scope changes are documented and priced
• State the statutory warranties (these are implied by law regardless, but must appear in the contract)
• Include dispute resolution procedures
• Have a signed copy of the CBOS Residential Building Consumer Guide attached by the builder at signing

Always verify your builder's licence at the CBOS online licence register before signing. Engaging an unlicensed builder voids many of the Act's consumer protections and makes warranty claims significantly more difficult.

The 5% Deposit Cap

The Act prohibits a builder from accepting a deposit exceeding 5% of the contract price unless specific exceptions apply. This protects owners from losing a large sum if a builder fails before construction begins. The deposit is the first payment in the progress payment schedule — but it's capped at 5% regardless of what a contract may say.

If a builder asks for a deposit above 5%, this is a breach of the Act. It's also a warning sign about how the rest of the contract may be structured.

Progress Payment Stages

Progress payments must be tied to defined stages of completed work. The law requires a written progress payment schedule in the contract specifying what must be complete before each payment is made. The HIA standard contract uses the following stages, which are widely used across the Tasmanian industry:

The percentage splits above are from HIA standard form contracts and represent common industry practice — they are not prescribed by Tasmanian legislation. The parties can negotiate different proportions, but the schedule must be fair and genuinely linked to work completed at each stage. Watch for front-loaded schedules that require large payments early relative to work done — these increase your risk significantly if the builder encounters financial difficulty.

Your Cooling-Off Right

Under section 33 of the Act, you have a cooling-off period of 5 business days from the day you receive a signed copy of the contract. During this period you can withdraw from the contract without significant financial penalty by giving written notice to the builder. The builder must return your deposit within 14 calendar days of receiving a valid cancellation notice; they may retain documented, reasonable out-of-pocket expenses incurred before the cancellation.

Written notice can be given: personally, by leaving it at the builder's address with a person apparently over 16, or by pre-paid certified mail. The cooling-off right cannot be waived by contract. If the builder fails to return the deposit within 14 days, TASCAT can make enforcement orders including interest penalties and legal cost recovery.

Statutory Warranties: Your Six-Year Protection

All residential building contracts carry statutory warranties implied by law, regardless of whether they appear in the contract. Your builder warrants that:

• All materials supplied are suitable for their purpose and of good quality
• All materials are new (unless otherwise stated)
• Work will be performed in accordance with all relevant laws and legal requirements (including the National Construction Code)
• Work will be carried out with reasonable care and skill
• Work will be in accordance with the plans and specifications in the contract

Importantly, if you sell the property, the new owners benefit from the warranties for the remainder of the original period. A claim must be made within the warranty period.

Home Warranty Insurance in Tasmania: What You Need to Know

Tasmania is the only Australian state without a currently operational compulsory home warranty insurance scheme. Tasmania had a housing indemnity insurance scheme from 1992 until it was abolished in 2008. The Residential Building (Home Warranty Insurance Amendments) Act 2023 passed in October 2023 and introduced a framework for a new scheme — but as at mid-2026, the operative provisions have not yet been proclaimed and the scheme has not commenced.

In the interim, CBOS administers a Financial Assistance Package for consumers affected by construction company failures. If your builder dies, disappears, or becomes insolvent:

• Incomplete work: up to 20% of the contract price, maximum $200,000
• Deposits paid where work has not commenced: up to 5% of the contract price

This is a government-funded discretionary payment, not insurance — but it provides comparable protection to the proposed scheme in a builder insolvency scenario. Choosing a licensed, financially stable builder is still your best protection. Verify a builder's licence status through the CBOS online licence register, and ask for evidence of current public liability insurance.

Variations: Changes During the Build

A variation is any change to the agreed scope of work — an upgrade to a fixture, a layout change, an addition to the brief. The Act requires a written process for handling variations, and your contract must specify how they're documented, priced, and agreed before the change is made.

In practice: never authorise a variation verbally. A written variation document, signed by both parties, with an agreed price and timeline impact is the only way to avoid a dispute later about what was agreed and what it costs. This applies to owner-initiated changes and to any builder-initiated changes (such as a specified product becoming unavailable).

Common Contract Risks for Homeowners

• Price escalation clauses in "fixed-price" contracts. Read carefully — some contracts allow price rises if material or labour costs increase beyond a threshold.
• Vague scope and specifications. Ambiguous descriptions of finishes, materials, and inclusions generate most construction disputes. Ensure plans and specs are detailed, complete, and annexed to the contract before you sign.
• Front-loaded progress payment schedules. A schedule that pays a disproportionate amount before equivalent work is done significantly increases your exposure.
• Cost-plus contracts with no guaranteed maximum. Without a price cap, there is no limit to what the build can cost.
• Signing before plans are finalised. Committing to a contract before full design documentation is complete invites scope disputes later.
• Verbal variations. Not in writing, not enforceable. Always get a signed variation document.
• Not understanding "practical completion." Practical completion triggers the final payment — but it typically means the home is complete with minor defects noted, not defect-free. You should have a clear defects list and a rectification period spelled out in the contract.

If a Dispute Arises: CBOS Mediation and TASCAT

The Act establishes a two-stage dispute resolution pathway:

Step 1 — CBOS mediation (mandatory). Before any formal legal proceeding, disputes must first go through CBOS mediation. CBOS investigates complaints, facilitates mediation between owner and builder, and can recommend contract amendments. This service is provided at no cost to homeowners and is a genuine dispute resolution mechanism — many disputes resolve at this stage.

Step 2 — TASCAT. If CBOS mediation doesn't resolve the matter, it can be escalated to TASCAT's Civil and Consumer Stream, which can order contract modifications, award damages, and make other enforcement orders. TASCAT applies both the Act and general contract law principles.

Separately, CBOS can take regulatory action against a licensed builder for licence misconduct, which is distinct from any civil dispute process.

How the Contract Relates to the Build Process

The building contract is one half of the legal framework for your project. The other half is the statutory approval pathway — the Certificate of Likely Compliance (CLC) from your building surveyor, the building permit process (where required), and the mandatory stage inspections during construction. These are independent of the contract but run in parallel with it. A good builder manages both tracks as part of the same integrated project programme.

For a full explanation of how stage inspections work and what gets checked at each milestone, read our companion guide to building inspections in Tasmania. For the broader permit process, see our guide to building permits in Tasmania.

Common Questions About Building Contracts in Tasmania

Does a builder have to give me a written contract?

Yes — for any residential building work worth $20,000 or more. A contract that is not in writing, or that doesn't include the mandatory provisions, is a breach of the Act by the builder and can be reported to CBOS.

Can I negotiate the contract terms?

Yes. Even a standard-form HIA or MBA contract is a starting point, not a take-it-or-leave-it document. The scope of works, specifications, inclusions, progress payment percentages (within legal limits), and timeline are all negotiable. The statutory minimums — the deposit cap, cooling-off right, warranties, and mandatory contract provisions — cannot be watered down by agreement.

Should I have a lawyer review my contract?

For a custom new build — typically the largest financial commitment you'll make — it is worth having a construction solicitor review the contract before you sign, particularly if the builder is using a bespoke contract rather than a standard-form HIA or MBA document. A solicitor can identify price escalation clauses, ambiguous scope descriptions, or unusual variation provisions that aren't obvious to a non-specialist. The cost of a legal review is small relative to the contract value.

What happens if the builder doesn't complete the work?

If the builder abandons the project, becomes insolvent, or fails to complete within a reasonable time, you can terminate the contract and make a claim for your losses. If the builder is insolvent, the CBOS Financial Assistance Package provides some recovery — up to 20% of the contract price (maximum $200,000) for incomplete work. CBOS mediation and TASCAT are the dispute resolution avenues if the builder is still trading but refusing to complete.

How Davies Approaches Contracts

Davies Design & Construction uses a clear, fixed-price contract for all new home builds — no price escalation clauses, no ambiguous specifications. Before you sign, we walk through the contract line by line so you understand exactly what's included, how variations are handled, and what the payment schedule looks like at each stage of construction.

Our design and construction process means your contract is backed by complete documentation — detailed plans, specifications, and a full bill of materials — before anything is priced. That's what makes a fixed-price contract genuinely fixed.

If you're planning a new home in northern or north-west Tasmania and want to understand how the contract and build process works before you commit, get in touch with the Davies team.