Construction Law & Contracts FAQ

Construction law is the area of legal practice concerned with the contracts, legislation, and disputes that arise from building and infrastructure projects. It applies to owners, builders, subcontractors, architects, engineers, and project managers involved in residential, commercial, and civil works. Construction law covers matters including contract formation, payment obligations, variations, delay claims, defects, and statutory payment regimes such as security of payment legislation.

ABIC contracts are the suite of building contracts published jointly by the Australian Institute of Architects and Master Builders Australia for architect-administered building work. The suite covers simple works, major works, and cost-plus arrangements, and is written for projects where an architect administers the contract between the owner and the builder. The contracts allocate roles to the owner, the builder, and the architect as contract administrator, and set out the process for progress claims, variations, extensions of time, and practical completion.

Special Conditions are drafted amendments that attach to a standard-form building contract to adjust or add to its terms without rewriting the contract from scratch. They are used to reflect the requirements of a particular project or jurisdiction, to align the contract with state or territory residential building legislation, and to address matters the standard form leaves open. They sit alongside the published form and keep the familiar structure of the standard contract while tailoring specific clauses to the transaction at hand.

Editing the body of a standard-form contract can introduce inconsistencies between clauses and make the amended form harder to review. Attaching Special Conditions keeps the published contract intact and records the changes in one identifiable place. This makes the amendments easier to read, negotiate, and check against the standard form. It also keeps the contract recognisable to the parties and their advisers, who can compare the Special Conditions against the clauses they modify.

Security of payment legislation provides a statutory right to progress payments for anyone who carries out construction work or supplies related goods and services. Each Australian state and territory has its own Act, including the Building and Construction Industry Security of Payment Act 1999 (NSW) and equivalent legislation in Victoria, Queensland, South Australia, Western Australia, and the ACT. The legislation establishes a rapid adjudication process for resolving payment disputes without the cost and delay of court proceedings.

Adjudication is a statutory dispute resolution process triggered when a payment claim is disputed or unpaid. The claimant applies to an authorised nominating authority, an adjudicator is appointed, and both parties make written submissions. The adjudicator determines the amount payable within a compressed timeframe, typically 10 to 15 business days. The determination is binding on an interim basis and enforceable as a debt, though either party may later pursue the dispute through court or arbitration.

Yes. A construction contract should be reviewed before signing to identify risk allocation, payment terms, variation procedures, and compliance with the residential building legislation in the relevant jurisdiction. Where changes are needed, they can be incorporated through Special Conditions rather than by rewriting the standard form. This keeps the published contract intact while recording the amendments in one identifiable place, and allows the changes to be checked against both the clauses they modify and the applicable legislation.

Under a monthly progress payment arrangement, the builder submits a claim on a regular cycle for the value of work carried out during the period. The process for assessing and certifying that claim depends on the contract form used. Under an ABIC contract, the architect acts as contract administrator: the architect assesses the claim, issues a payment certificate stating the amount due, and the owner pays the certified amount within the time the contract allows. Under a Master Builders contract such as BC3 (commercial) or BC4 (residential), there is no independent contract administrator: the builder submits the progress claim directly to the owner (or principal), who assesses the claim and makes payment in accordance with the contractual timeframe. In all cases, monthly progress payments give the parties a regular, predictable rhythm for claiming and paying for work as it advances. Where a contract administrator is appointed, the certification step provides the owner with an independent assessment of the amount payable before payment falls due; where no administrator is appointed, the owner bears direct responsibility for verifying that the claimed amount reflects the work actually completed.

Progress payments are claimed on a regular calendar cycle for the value of work completed in the period, while stage payments are claimed when defined milestones are reached, such as base, frame, and lock-up. Progress claims track the actual advancement of the work over time, whereas stage payments tie payment to specific deliverables. The choice between these approaches should be checked against the residential building legislation in the applicable jurisdiction, as some states restrict or prescribe the payment structures available for domestic building work.

A cost-plus contract pays the builder for the actual cost of the work plus an agreed margin, rather than a fixed lump sum. This pricing model is common on luxury and high-end residential projects where the scope evolves during construction or where bespoke finishes make fixed pricing impractical. Residential building legislation in several states and territories restricts or conditions the use of cost-plus arrangements for domestic building work. Cost-plus residential compliance means drafting or amending the contract to meet the requirements of the relevant jurisdiction, including disclosure, estimate, and record-keeping obligations that apply to cost-plus domestic work.

A lump-sum contract fixes the contract price for a defined scope, which suits projects where the scope is settled and the owner wants price certainty. A cost-plus contract reimburses the actual cost of the work plus a margin, which suits projects where the scope is uncertain or expected to change. The right choice depends on how well the scope is defined, how the parties want to share cost risk, and whether the residential building legislation in the jurisdiction conditions or restricts cost-plus arrangements for domestic work.

Choosing the right contract starts with the nature of the work and how the price is set. Consider whether the project is simple works or major works, whether the price is a lump sum or a cost-plus arrangement, the jurisdiction the work is in, and whether the project needs additional provisions for matters such as monthly progress payments, force majeure, or supply-chain risk. For luxury and high-end residential projects, contract selection also involves careful attention to bespoke finishes, long lead-time materials, and detailed provisional sum and prime cost structures. Matching those factors to the appropriate contract form, then adding Special Conditions for the jurisdiction and the project, produces a contract suited to the work.

Yes. Residential building legislation differs across the Australian states and territories, so Special Conditions drafted for one jurisdiction will not necessarily suit another. For example, conditions written for New South Wales address the Home Building Act 1989 (NSW), while conditions for Western Australia address the Home Building Contracts Act 1991 (WA). Using Special Conditions that are scoped to the jurisdiction the work is in keeps the contract aligned with the legislation that applies to that project.

Under an ABIC contract the architect acts as the contract administrator between the owner and the builder. The architect assesses progress claims and issues payment certificates, decides on variations and extensions of time within the contract framework, and administers the process through to practical completion. This administration role is a defining feature of the ABIC suite and distinguishes it from head contracts that do not provide for architect administration.

Construction disputes in Australia can be resolved through negotiation, mediation, adjudication under security of payment legislation, arbitration, or court proceedings. Adjudication provides a rapid interim determination of payment disputes. Mediation is a voluntary, non-binding process that can resolve broader disputes without the cost of a hearing. Arbitration and litigation are formal processes that produce binding outcomes but take longer and involve higher costs. The appropriate path depends on the nature of the dispute, the amounts involved, and the terms of the contract.

Risk allocation refers to how a construction contract distributes responsibility for events such as delays, cost overruns, site conditions, design changes, and force majeure between the parties. A well-drafted contract allocates each risk to the party best placed to manage it. Poor risk allocation can lead to disputes, inflated pricing, or uninsured losses. Reviewing and, where appropriate, amending the risk allocation through Special Conditions is a standard part of front-end contract structuring.

Master Builders Australia publishes its own suite of building contracts. BC3 is a lump-sum head contract for commercial or industrial building work that does not provide for architect administration. BC4 is a lump-sum head contract for residential work that does not provide for architect supervision. The ABIC contracts differ in that they are written for architect-administered work, with the architect assessing claims, certifying payments, and administering the contract. The choice between a Master Builders form and an ABIC form depends on whether the project will be architect-administered and on the procurement model the parties have agreed.

Christopher Larcos advises owners, builders, architects, and consultants on construction contracts and related matters. His advisory work covers contract drafting and review, front-end project structuring, tendering and procurement strategies, security of payment, and dispute resolution. He works across residential and commercial projects, including luxury and high-end residential developments where contract precision and risk allocation are particularly important. He also works with international architecture practices on the building contracts that govern their Australian projects.

A construction contract specialist is a legal practitioner with specific expertise in construction contracts, as distinct from a general commercial lawyer who occasionally handles building matters. A contract specialist understands the standard-form contracts used in the industry (such as ABIC, AS, and Master Builders forms), how they allocate risk, and where their standard terms need amendment for particular projects or jurisdictions. In the ABIC context, a contract specialist is typically someone who understands both the legal framework and the architect-administered contract model, and who can draft special conditions that work with the contract rather than against it. Christopher Larcos is a construction contract specialist with a dual qualification as a solicitor and architect, which gives him practical insight into how contracts are administered on building projects.

A contract administrator is the person appointed under the building contract to administer the agreement between the owner and the builder. Under ABIC contracts, the contract administrator is the architect. The contract administrator assesses progress claims and issues payment certificates, decides on variations and their value, assesses claims for extensions of time, administers practical completion and the defects liability period, and acts independently in making assessments and decisions, rather than as the owner’s agent. The contract administrator’s role is a defining feature of ABIC contracts and distinguishes them from forms like Master Builders BC3 and BC4, which do not provide for independent contract administration. When the contract administrator gets the role wrong (by acting outside their authority, failing to certify within time, or treating their decisions as advocacy rather than assessment), it is one of the most common triggers for construction payment disputes and security of payment applications.