10 things that residential builders need to get right

1. Contracts – make sure they comply with the requirements under the Home Building Act (HBA)

The contracts should:

• comply with the contract requirements under the HBA if the builder is carrying out work with a value of $5,000 (including GST) and above, for example the contracts should be in writing, provide a sufficient description of the work etc. Its best to use the standard forms as they contain all of the required information;

• not just be a quote or a purchase order as they do not comply with the HBA requirements and the builder will be in breach of the HBA and unable to rely on the quote or purchase order to get paid when contracting directly with a homeowner. Of course, there are exceptions to these requirements in the case of any emergency work concerning a hazard or a safety issue;

• ensure that builders don’t exceed the maximum deposits and maximum progress payments;

• ensure that the works are clearly defined in terms of scope and price and that any ambiguity is resolved before the contract is signed; and

• make it clear that the contract price can change for variations, PC and provisional sums etc.

2. Licencing – don’t carry out any residential building work that the builder is not licenced to do

Builders must ensure:

• that all of its sub-contractors that carry out specialist work (and any sub-contractors that are required to be licenced) such as its water proofers, plumbers and electricians are appropriately licenced;

• that the entity which has entered into the contract with the homeowner is licenced to carry out the work. It is not good enough for a builder to engage a licenced sub-contractor to carry out the work, the entity entering into the contract has to be licenced to carry out the work; and

• that there are no restrictions on the licence if the builder is contracting directly with homeowners. We have seen too many times to count, instances where the entity in the contract does not hold an open licence to carry out the work and has a condition on the licence which says that the entity is not licenced to carry out works for which HBCF insurance is required, that is, work with a value of over $20,000.

3. Insurance – no insurance = big problems

Remember that:

• the entity which is entering into the contract must have its insurance in place including insurance under the Home Building Compensation Fund (HBCF) if the value of the work is $20,000 or over;

• it is a breach of the HBA to take any money from a homeowner (including a deposit) when a certificate of HBCF has not been provided to the homeowner; and

• if HBCF insurance is not in place, the builder is not entitled to make any claims for payment even on a quantum meruit basis, unless the Court or Tribunal considers it “just and equitable” for the builder to recover money in the absence of insurance. Also, if there are defects in the work carried out, it would be much harder to satisfy a Court or Tribunal that the builder should be paid and also, harder to obtain retrospective insurance.

4. Increases in the contract price/variations/PC and provisional sums

• ensure that the builder complies with the variation procedure in the contract.

All variations should be approved in writing by the homeowner including not only the approval to carry out the variation itself but also approval of the cost of the variation. No variations should commence until written approval has been obtained from the homeowner. By taking this simple step will avoid a lot of headaches down the track in terms of getting paid; and

• All PC and provisional sums should be based on firm estimates or quotations to limit any surprise and of course disputes.

5. Quality of sub-contractors – find the good ones

• find good quality sub-contractors and pay them well.

Most defect claims will come down to the quality of the work carried out by the builder’s sub-contractors and so it’s a worthwhile investment to have quality trades carrying out the works.

• good quality water proofers are in hot demand carrying out rectification work and it’s easy to see why given that most defect claims include water ingress issues caused by failed waterproofing in wet areas, balconies and planter boxes [we could have a whole section dedicated to why planter boxes may look good but are a nightmare for builders in terms of defect claims but that’s for another day].

6. Practical Completion – what does it mean?

• clearly define what practical completion is as this can be a point of contention between builders and homeowners as homeowners may be under a misapprehension of what practical completion actually means; and

• as a practical suggestion, ensure that the works are practically complete and all minor defects are rectified before the homeowner inspects as this will help to avoid the common dispute about when PC has been reached and the homeowner withholding the final progress claim because they are unhappy with the works. Remember the homeowner is buying “the dream” and expects that the house will be ready to occupy. It is better in the long run, in terms of cost and time, to try and meet that expectation if possible.

7. OC – clearly specify the builder’s obligations in relation to obtaining the OC?

• clearly specify in the contract what the builder’s obligations are in relation to providing the certificates and documents required in order to obtain the OC (which is usually the homeowner’s responsibility to obtain from Council or a private certifier) and also stipulate whether the builder has an ongoing obligation to assist the homeowner in obtaining the OC.

8. Claims by the builder – have the paperwork in order

• if the builder is making claims for the payment of money due under the contract, ensure that the contractual provisions are complied with concerning the builder’s entitlement to those moneys and that all supporting documentation is provided; and

• ensure that progress claims are not issued prematurely when the work the subject of the claim has not been completed (as this could be deemed to be a breach of the contract and a breach of the HBA).

9. Claims by homeowner – defects/incomplete work/negligence

• use the defences available under the HBA if the builder has been instructed to carry out works by the homeowner or a professional such as an architect or engineer, contrary to the builder’s advice. The builder must put any objection to carrying out any such works in writing to the homeowner;

• use every opportunity to rectify defects to limit the issues in dispute. There is no strategic advantage in delaying rectification in exchange for the payment of money as this will only end up in litigation as builders are liable to fix defects regardless of whether payment has been made; and

• any items not agreed can be resolved with the assistance of NSW Fair Trading, mediation or proceeding to a Court of Tribunal to determine as a last resort.

10. Keep up to date with the changes in legislation

By way of example, some of the recent changes (some of which apply to class 2 buildings only) include:

• From 10 June 2020, owners with defects will benefit from the statutory duty of care that applies to new buildings, and existing buildings where an economic loss first became apparent in the previous 10 years;

• From 1 September 2020, the NSW Building Commissioner will be able to stop an occupation certificate from being issued, order developers to rectify defective buildings, and issue stop work orders;

• From 1 March 2021, residential builders can rely upon the Building and Construction Industry Security of Payment Act (SOPA) and issue payment claims against homeowners. See our attached article here; and
• From 1 July 2021, there will be compulsory registration for practitioners involved in design and building work, including professional engineers

If you would like to discuss any of the above, please contact us.


Mining owners and operators in most Australian States[1] will be aware of the “mining exception” in security of payment legislation.  The mining exception excludes ‘the extraction (whether by underground or surface working) of minerals, including tunnelling or boring, or constructing underground works for that purpose[2] (Mining Exception) from the definition of the term “construction work” and, consequently, the ambit of statutory interim progress payment mechanisms.

However, in a decision handed down on 11 November 2020, the NSW Supreme Court[3] followed the approach of the Queensland courts[4] by construing the Mining Exception narrowly in favour of contractors and subcontractors.  In short, the Mining Exception does not  extend generally to some broad category of mining industry operations.[5]


Downer EDI Mining Pty Ltd (Downer) was engaged by Cadia Holdings Pty Ltd (Cadia) the operator of the Cadia East underground panel cave mine south-west of Orange, under a “Works Contract” dated 16 November 2018 (Contract), to perform “development phase” works, being (for the most part) underground works to provide access to the proposed undercut and extraction levels for future extraction of minerals in the “production phase”[6]

Downer proceeded to adjudication on a payment claim served on Cadia.  An adjudicator appointed under the Building and Construction Industry Security of Payment Act 1999 (NSW) (SOPA) determined that Cadia pay Downer $1,017,741.72.[7]

Cadia challenged the determination on two grounds:

  1. the Mining Exception applied so the Contract was not a “construction contract” within the meaning of the SOPA; and
  2. there was no available reference date to support Downer’s payment claim.


Cadia’s challenge to the adjudication determination was unsuccessful on both grounds.

Stevenson J framed the effect of the Mining Exception as excluding ‘from the definition of “construction work”, the following works:

  • extraction (whether by underground or surface working) of minerals;
  • tunnelling or boring for the purpose of extraction (whether by underground or surface working of minerals; and
  • constructing underground works for the purpose of extraction (whether by underground or surface working) of minerals.[8]

His Honour held that the heart of the question of the application of the Mining Exception to a contract is what a contractor undertakes to do under the contract in question, not what work that contractor actually does[9] (which comes to be answered later).

The works under the Contract did include “tunnelling or boring” as well as “constructing underground works”.  However:

  1. these activities were not for the “purpose of” extraction of minerals; and
  2. the Contract required Downer to undertake work beyond these activities which fell within the meaning of “construction work” or the supply of “related goods and services”.

On considering generally whether activities performed by a contractor are for the “purpose of” extraction of minerals, His Honour:

  1. agreed with Fryberg J in Thiess that the relevant purpose should be decided ‘by reference to what a reasonable person in the position of the parties would conclude as to the object of what purpose of the contract[10];
  2. held that the Mining Exception is to be construed narrowly to benefit the subcontractor[11];
  3. held that a close “proximity” between the act of extraction and the tunnelling and boring or construction of underground works was required (and this was not so in this case, where the extraction phase would not begin until 2022 after subsequent works)[12];
  4. considered that “extraction” does not include work “associated with” or “preparatory to” extraction[13]; and
  5. noted that the SOPA expresses where there is an intention to bring in ancillary activities, which is not the case with the Mining Exception[14].

Further, in this case, His Honour considered that some works under the Contract required of Downer were “construction work” or supply of “related goods and services”, meaning the SOPA applied.  Relevantly, His Honour stated (accepting Downer’s counsel’s submission):

…if there is a contract which contains undertakings to carry out construction work and undertakings to carry out work that it not construction work, the contract remains a construction contract. If a payment claim includes a claim for work that is not construction work, the payment claim is valid, but the adjudicator should not award an amount for work that is not construction work. Thus, the Mining Exception has an important role to play in limiting the amount that the adjudicator should award.[15]

On the reference date point, His Honour determined that there was an available reference date under the Contract for the service of the payment claim.  Most of the points raised were of limited significance for general application.  One point of general interest was that a clause of the Contract required Downer to invoice ‘in respect of the Services performed’ of the proceeding month.[16]  Downer’s works were performed not in the preceding month, but at an earlier time.

His Honour relied on s.13(4) of the SOPA which allows a contractor to serve a payment claim within the period determined under the construction contract or 12 months after construction work to which the claim relates was last carried out.  The payment clause in the Contract attempted to restrict the operation of s.13(4) and was a void provision, by operation of s.34 of the SOPA.

Take Home Tips

Contractors who consider that they are not entitled to have recourse to security of payment legislation simply because they work on a mine site should re-examine closely the terms of their contract.  Can it really be said that the contract works are for the “purpose of” extraction?  Or is there some distance between the works to be performed and the eventual act of extraction?

Perhaps there are portions or stages of works under the contract to which the Mining Exception would apply, but this would not necessarily mean that the entire contract is not a “construction contract” within the meaning of the security of payment legislation.



[1] Queensland, Victoria, South Australia, Tasmania and the Australian Capital Territory.  However, Western Australia is likely to shortly follow suit once the Building and Construction Industry (Security of Payment) Bill 2020 (WA) passes through Parliament.

[2] Section 5(2) of the Building and Construction Industry (Security of Payment) Act 1999 (NSW).

[3] Cadia Holdings Pty Ltd v Downer EDI Mining Pty Ltd [2020] NSWSC 1588 per Stevenson J.

[4] HM Hire Pty Limited v National Plant and Equipment Pty Ltd [2012] QSC 4 and Thiess Pty Ltd v Warren Brothers Earthmoving Pty Ltd [2012] QCA 276 (Thiess)

[5] At [133].

[6] At [92] and [93].

[7] At [3].

[8] At [34].

[9] At [70].

[10] At [96], quoting Fryberg J in Thiess at [76].

[11] At [102]

[12] At [103] and [91].

[13] At [104].

[14] At [105].

[15] At [134].

[16] At [171].