Contracts and variations

62 terms in contracts and variations

Written building contract

A written building contract is the signed document that records the scope, price, payment stages and obligations of residential building work. Australian domestic building legislation generally requires one above modest value thresholds, and the details protect the builder as much as the owner. General information, not legal advice. Written building contract guide.

Domestic building legislation

Domestic building legislation is the body of state and territory law that regulates residential building work in Australia, setting contract requirements, deposit and progress payment rules, implied warranties and insurance obligations. Each jurisdiction has its own Act, so the rules differ by state. General information, not legal advice. Residential building contracts reference.

Lump sum contract

A lump sum contract, also called a fixed price contract, sets one total price for the defined scope before work starts. The builder carries the risk of cost movement inside that scope, and the price only changes through variations and the adjustment of prime cost items and provisional sums. Fixed price vs cost plus reference. See also: Cost plus contract, Variation.

Cost plus contract

A cost plus contract charges the client the actual cost of the work plus an agreed fee or margin, so the client carries the risk of cost. It suits jobs whose scope cannot be fixed up front, demands disciplined record keeping, and some Australian jurisdictions restrict its use for domestic building work. General information, not legal advice. Fixed price vs cost plus reference. See also: Lump sum contract.

Design and construct contract(D&C)

A design and construct contract makes one party, usually the builder, responsible for both completing the design and building the work. The client gets a single point of responsibility, and the builder takes on design risk alongside construction risk. Building contract types reference.

Schedule of rates contract

A schedule of rates contract prices the work as agreed rates per unit of measured work rather than one fixed total. The final price depends on the quantities actually performed, which suits work whose extent cannot be known up front. Building contract types reference.

Guaranteed maximum price(GMP)

A guaranteed maximum price contract is a cost plus arrangement with a ceiling. The client pays actual cost plus a fee up to an agreed maximum, and the builder carries the cost risk above that cap. Building contract types reference. See also: Cost plus contract.

Standard form contract

A standard form contract is a pre-drafted contract suite maintained by an industry body and updated to remain compliant with each state’s domestic building legislation. In Australian residential building the two main families are the HIA suite and the Master Builders suite, and the state edition matters more than the badge. HIA vs Master Builders reference.

HIA contract

An HIA contract is a residential building contract from the suite published by the Housing Industry Association, one of the two main families of standard form contract used by Australian builders. Each state has its own edition aligned with that state’s domestic building legislation. HIA vs Master Builders reference. See also: Master Builders contract.

Master Builders contract

A Master Builders contract is a residential building contract from the suite published by the Master Builders associations, one of the two main families of standard form contract used by Australian builders. As with the HIA suite, the state edition carries the jurisdiction-specific requirements. HIA vs Master Builders reference. See also: HIA contract.

Variation(VO)

A variation is a documented change to the contracted scope and price of a building job, agreed in the sequence document, price, approve, then build. It differs from a prime cost or provisional sum adjustment, which trues up an allowance the contract already carried, and an approved variation propagates through the budget, the claim schedule and the programme. Variations reference. See also: Prime cost item, Provisional sum, Variation register.

Variation register

A variation register is the running record of every variation on a job, its status, its price and its approval. Kept as one system with the claim schedule, it is what stops approved extra work being delivered and never billed. Variations reference. See also: Variation.

Scope creep

Scope creep is extra work absorbed into a job without a documented variation, so the scope grows while the price does not. It is the informal cousin of the variation, and it erodes margin invisibly because the cost lands without the corresponding revenue. Variations reference. See also: Variation.

Extension of time(EOT)

An extension of time is a formal adjustment of the contract completion date for delay caused by qualifying events the contract defines. It moves the date but not automatically the money, it usually depends on written notice within the contract timeframes, and without one a late job can expose the builder to liquidated damages. Extensions of time reference. See also: Liquidated damages, Contemporaneous record.

Liquidated damages(LD)

Liquidated damages are a rate for delay agreed in the contract, payable when the work finishes after the contracted completion date without an extension of time. The rate must be a genuine pre-estimate of the loss rather than a penalty, and the same mechanism can protect a builder as easily as expose one. General information, not legal advice. Liquidated damages reference. See also: Extension of time.

Practical completion(PC)

Practical completion is the point under a residential building contract at which the work is complete except for minor omissions and defects, and the home can be used for its intended purpose. The final claim, handover, the defects liability period and several warranty clocks all hang off the date. In estimating, PC also stands for prime cost item, a different concept. Practical completion reference. See also: Defects liability period, Prime cost item, Occupation certificate.

Defects liability period(DLP)

The defects liability period is the contractual window after practical completion during which the builder must return and rectify defects that emerge. It is a contract mechanism, distinct from the statutory warranties implied by legislation and from warranty insurance, three different clocks that builders and clients routinely confuse. Practical completion reference. See also: Statutory warranties, Practical completion.

Handover

Handover is the moment the completed home passes to the client, typically at or after practical completion once the final claim is settled. A handover done well transfers the keys, the documents, the warranties and the operating knowledge of the home in one organised package. Practical completion reference.

Statutory warranties

Statutory warranties are the promises about workmanship, materials, compliance and fitness that Australian domestic building legislation implies into every residential building contract. They cannot be contracted out of, they run for periods set per state, and they sit apart from the defects liability period and from warranty insurance. General information, not legal advice. Statutory warranties reference. See also: Defects liability period.

Major defect

A major defect is the class of serious defect, typically one affecting a major structural element or making the home uninhabitable, that attracts the longer statutory warranty period. The precise definition and the periods are set by each state’s legislation and differ between jurisdictions. General information, not legal advice. Statutory warranties reference. See also: Statutory warranties.

Defect

A defect is work that does not meet the standard the contract, the plans, the National Construction Code or the relevant standards require. Managing defects means keeping one register, separating genuine defects from maintenance items and wishlist requests, and attributing rectification cost to whoever caused it. Defects management reference. See also: Defects list.

Defects list

A defects list is the documented list of incomplete or defective items identified at practical completion or during the defects liability period, each to be rectified before the relevant sign-off. One agreed list, with dates and evidence, is what turns the defects period from an argument into a workflow. Defects management reference.

Rectification

Rectification is the work of correcting a defect. On a well-run job the cost of rectification is attributed to whoever caused the defect, which is what back-charges and subcontractor call-backs exist to do. Defects management reference. See also: Back-charge.

Deposit (building contract)

The deposit is the initial payment made when a residential building contract is signed, before work starts. Australian domestic building legislation caps the deposit a builder may take, the cap differs by state and contract value, and in most states compulsory warranty insurance must be in place before a deposit is taken. General information, not legal advice. Residential building contracts reference.

Request for information(RFI)

A request for information is the formal query a builder raises when the drawings or specification do not answer a question the build needs answered. An unanswered RFI becomes a delay, a response can trigger a variation or an extension of time, and the register of RFIs is part of the job’s evidence trail. RFIs and site queries reference.

Specification

The specification is the contract document that describes the materials, products, finishes and standards of the work, complementing what the drawings show. The contract sets which document prevails when the drawings and the specification disagree, and an ambiguous specification quietly manufactures variations. Specifications reference.

Site diary

A site diary is the daily record of what actually happened on site, weather, labour, deliveries, delays, directions and progress. A contemporaneous record made on the day is the evidence that wins an extension of time, a variation or a dispute months later. Site diaries reference. See also: Contemporaneous record.

Contemporaneous record

A contemporaneous record is documentation created at the time of the event it records, such as a site diary entry, a dated photo or a delivery docket. Because it was made before any dispute existed, it carries far more evidentiary weight than a recollection assembled afterwards. Site diaries reference.

Subcontract

A subcontract is the agreement between a builder and a trade for a defined scope of work on a job, carrying obligations in both directions, scope, program, quality, payment terms and often retention. It is the right instrument where a purchase order is too thin, typically where labour, sequencing and workmanship obligations matter. Subcontractor management reference. See also: Purchase order, Trade package.

Back-charge

A back-charge is a cost the builder deducts from a subcontractor’s payment because the subcontractor’s work or damage caused that cost, for example rectifying defective work or cleaning up after a trade. Fair back-charging depends on evidence and notice, not just a deduction on the remittance. Subcontractor management reference.

Novation

Novation is replacing one party to a contract with a new party by the agreement of everyone involved, so the incoming party takes over the original party’s rights and obligations as if it had been there from the start. It is common where a design consultant engaged by the owner is novated to the builder on a design and construct job. General information, not legal advice. Residential building contracts reference. See also: Design and construct contract.

Time at large

Time at large is the situation where a contract’s completion date stops being enforceable, commonly because the owner caused delay and the contract had no working mechanism to extend the date. The builder is then obliged to finish within a reasonable time rather than by a fixed date, and liquidated damages generally cannot be claimed. General information, not legal advice. Extensions of time reference. See also: Extension of time, Liquidated damages.

Latent conditions

Latent conditions are physical site conditions that could not reasonably have been anticipated when the contract was priced, such as rock, contaminated ground, fill or unexpected services. Which party carries the cost and time of a latent condition depends on how the contract allocates that risk, and it is a frequent source of variations and delay claims. General information, not legal advice. Residential building contracts reference. See also: Variation, Extension of time.

Force majeure

A force majeure clause excuses a party from performing, or extends its time to perform, when an event beyond its reasonable control prevents the work, such as a natural disaster. It only operates on the terms the contract actually sets out, so what counts as force majeure and what relief it gives are matters of the specific clause. General information, not legal advice. Residential building contracts reference.

Sunset clause

A sunset clause sets a date by which a defined event must happen, failing which one or both parties may end the contract. It is most associated with off-the-plan sales, and it can cut both ways depending on who is entitled to rely on it. General information, not legal advice. Residential building contracts reference.

Cooling-off period

A cooling-off period is a short window after signing during which an owner may withdraw from a residential building contract, where the relevant state legislation provides one. Its availability, length and conditions differ by jurisdiction, so confirm current requirements with the relevant authority. General information, not legal advice. Residential building contracts reference.

Owner-builder

An owner-builder is a person who takes on the responsibilities of a licensed builder for work on their own property, usually after obtaining an owner-builder permit above a value threshold set by the state. It shifts supervision and warranty duties onto the owner, and the permit rules and thresholds differ by jurisdiction, so confirm current requirements with the relevant authority. General information, not legal advice. Residential building contracts reference.

Principal (contract)

The principal is the party that commissions the building work and for whom it is carried out, most often the owner on a residential job. The term matters in contracts and in security of payment, where obligations flow between the principal and the contractor. It is distinct from the principal contractor, a work health and safety role. Residential building contracts reference. See also: Principal contractor.

Head contract

The head contract is the main contract between the owner and the builder, sitting above the subcontracts the builder enters with its trades. Terms in the head contract, such as program, quality and payment, are commonly passed down into the subcontracts so the builder is not caught between mismatched obligations. Building contract types reference. See also: Subcontract.

Quantum meruit

Quantum meruit is a claim for the reasonable value of work performed where there is no enforceable agreed price for it, for example where the work was done outside the contract or the contract is unenforceable. It is a fallback based on the value of the work rather than on a contract rate. General information, not legal advice. Residential building contracts reference.

Set-off

Set-off is deducting an amount one party owes against an amount it is owed, so only the net difference changes hands. A builder relies on set-off when it back-charges a subcontractor, and the right to do it depends on the contract and the circumstances. General information, not legal advice. Retention and payment terms reference. See also: Back-charge.

Bank guarantee

A bank guarantee is an unconditional undertaking from a bank to pay a stated sum on demand, used as security in place of cash so a party’s own funds are not tied up. On building work it can secure performance or replace cash retention, and it is called on if the secured obligation is not met. General information, not legal advice. Retention and payment terms reference. See also: Retention.

Security deposit

A security deposit is money or a bank guarantee one party holds as security that the other will perform its obligations, released when those obligations are met. In subcontracting it overlaps with retention, and the contract sets how much is held and when it comes back. Retention and payment terms reference. See also: Retention, Bank guarantee.

Unfair contract terms

The unfair contract terms regime under the Australian Consumer Law can make a term in a standard form consumer or small business contract void where it creates a significant imbalance, is not reasonably necessary to protect a party and would cause detriment. It applies to many residential building contracts, and the current scope and penalties should be confirmed with the relevant authority. General information, not legal advice. Residential building contracts reference.

Entire agreement clause

An entire agreement clause states that the written contract is the whole of what the parties agreed, so earlier emails, quotes and conversations do not add to or vary it. It is why the terms that matter need to be inside the signed contract rather than in the correspondence around it. General information, not legal advice. Residential building contracts reference.

Time is of the essence

Time is of the essence is a contract term making strict compliance with a deadline an essential obligation, so that missing it can be a serious breach rather than a minor one. Whether it applies, and to which dates, is a matter of the specific contract. General information, not legal advice. Residential building contracts reference.

Superintendent

The superintendent is the person named in some building contracts to administer them, assess claims, value variations and grant extensions of time, acting fairly between the parties when certifying. The role is common on commercial and larger contracts and rare on small residential jobs, where the owner or builder handles the same functions directly. Building contract types reference.

Dispute resolution clause

A dispute resolution clause sets out the steps parties must follow when they disagree, commonly negotiation, then mediation, then arbitration or a tribunal or court. Following the contract’s process in order matters, because skipping a required step can stall a claim. General information, not legal advice. Residential building contracts reference. See also: Mediation, Arbitration.

Mediation

Mediation is a without-prejudice process in which an independent mediator helps the parties reach their own settlement, rather than imposing a decision on them. It is often a required step before arbitration or a hearing, and its outcome binds only if the parties sign an agreement. General information, not legal advice. Residential building contracts reference. See also: Dispute resolution clause.

Arbitration

Arbitration is a private process in which an independent arbitrator hears a dispute and makes a binding award, as an alternative to going to court. Whether a dispute goes to arbitration depends on the contract, and the award is generally enforceable much like a judgment. General information, not legal advice. Residential building contracts reference. See also: Mediation.

Expert determination

Expert determination refers a defined question, often technical, to an independent expert whose decision the parties agree to accept, usually faster and narrower than arbitration. Its binding effect and scope come from what the contract says the expert may decide. General information, not legal advice. Residential building contracts reference.

Building tribunal

A building tribunal is the state body that hears many residential building disputes as a lower-cost alternative to court, such as VCAT in Victoria, NCAT in New South Wales and QCAT in Queensland. Jurisdiction, monetary limits and process differ by state, so confirm the current position with the relevant tribunal. General information, not legal advice.

Repudiation

Repudiation is conduct by one party showing it no longer intends to be bound by the contract, or is unable to perform it, which can entitle the other party to terminate. Getting it wrong is dangerous, because purporting to terminate without the right to do so can itself be a breach. General information, not legal advice. Residential building contracts reference. See also: Termination.

Termination

Termination is bringing a building contract to an end before completion, whether for a breach the contract allows termination for or under a right the contract gives. It has serious consequences for both parties, and the grounds and process set out in the contract and the law must be followed exactly. General information, not legal advice. Residential building contracts reference. See also: Repudiation.

Frustration of contract

Frustration is the ending of a contract by law when an unforeseen event makes performance impossible or radically different from what was agreed, through no fault of either party. It is a narrow doctrine and rarely applies just because a job has become harder or more expensive. General information, not legal advice. Residential building contracts reference.

Indemnity

An indemnity is a promise by one party to cover the other against defined losses or claims, shifting a risk from one to the other. Indemnity clauses are common in building contracts and subcontracts, and their reach depends closely on the wording. General information, not legal advice. Residential building contracts reference.

Contractual warranty

A contractual warranty is a promise written into the contract about the quality, materials or performance of the work, sitting alongside the statutory warranties that legislation implies and that cannot be excluded. The two are different sources of the same kind of protection, and a builder should know which promises come from the contract and which from the law. General information, not legal advice. Statutory warranties reference. See also: Statutory warranties, Defects liability period.

Defect and damage

The distinction between defect and damage decides who pays to fix a problem. A defect is work that fails to meet the required standard, which the builder or the responsible trade must rectify, while damage is harm to completed work from an outside event, which may be an insurance or a separate liability question. Keeping the two apart on one register stops rectification cost being misattributed. Defects management reference. See also: Defect.

Special conditions

Special conditions are the clauses added to a standard form contract to cover what the standard wording does not, tailoring it to the particular job. They override the general conditions where they conflict, which is why they deserve close reading, they are where the real risk allocation on a job usually sits. General information, not legal advice. Residential building contracts reference. See also: General conditions.

General conditions

The general conditions are the standard clauses of a building contract that apply to every job using that form, covering payment, variations, delays, defects and dispute resolution. They are read together with the special conditions and the schedules, and the special conditions prevail where the two disagree. Residential building contracts reference. See also: Special conditions.

Contract price

The contract price is the agreed amount payable for the contracted scope, before it is adjusted by variations and by the truing-up of prime cost items and provisional sums. It is the baseline every later adjustment is measured against, which is why the assumptions behind it need to be recorded, not just the number. Residential building contracts reference. See also: Variation, Allowance.

Rise and fall clause

A rise and fall clause allows the contract price to be adjusted for movements in the cost of labour and materials over the life of the job, rather than fixing the price at signing. Most residential contracts are fixed price without rise and fall, which is why long build times and volatile prices put the cost risk on the builder. General information, not legal advice. Residential building contracts reference. See also: Cost escalation.