{{ propApi.closeIcon }}
Our industry
Our industry $vuetify.icons.faArrowRight
Economic research and forecasting Economics Housing outlook Tailored market research Economic reports and data Inspiring Australia's building professionals HOUSING The only place to get your industry news Media releases Member alerts Submissions See all
Business support
Business support $vuetify.icons.faArrowRight
Become an apprentice host Hire an apprentice Why host a HIA apprentice? Apprentice partner program Builder and manufacturer program Industry insurance Construction legal expenses insurance Construction works insurance Home warranty insurance Tradies and tool insurance Planning and safety services Building and planning services How can HIA Safety help you? Independent site inspections Solutions for your business Contracts Online HIA Tradepass HIA SafeScan HR Docs Trusted legal support Legal advice and guidance Professional services Industrial relations
Resources & advice
Resources & advice $vuetify.icons.faArrowRight
Building it right Building codes Australian standards Getting it right on site See all Building materials and products Concrete, bricks and walls Getting products approved Use the right products for the job See all Managing your business Dealing with contracts Handling disputes Managing your employees See all Managing your safety Falls from heights Safety rules Working with silica See all Building your business Growing your business Maintaining your business See all Other subjects COVID-19 Getting approval to build Sustainable homes
Careers & learning
Careers & learning $vuetify.icons.faArrowRight
A rewarding career Become an apprentice Apprenticeships on offer Hear what our apprentices say Advice for parents and guardians Study with us Find a course Get your builder's licence Learn with HIA
HIA community
HIA community $vuetify.icons.faArrowRight
Join HIA Sign me up How do I become a member? What's in it for me? Get involved Become an award judge Join a committee Partner with us Get to know us Our members Our people Our partners Mates rates What we do Mental health program Charitable Foundation GreenSmart
Awards & events
Awards & events $vuetify.icons.faArrowRight
Awards Australian Housing Awards Awards program National Conference Industry networking Events
HIA products
HIA products $vuetify.icons.faArrowRight
Shop @ HIA Digital Australian Standards Contracts Online Shipping and delivery Purchasing terms & conditions Products Building codes and standards Hard copy contracts Guides and manuals Safety and signage See all
About Contact Newsroom
$vuetify.icons.faMapMarker Set my location Use the field below to update your location
Change location
{{propApi.text}} {{region}} Change location
{{propApi.successMessage}} {{region}} Change location

$vuetify.icons.faPhone1300 650 620

Variations and extensions of time

Members often find themselves in dispute relating to recovery for unsigned variations and delays in completing construction. These issues may be avoided by adopting better contract administration procedures. The information below will focus on these two common areas of dispute. It will also outline how a builder can claim for an extension of time and variation.

Extensions of time 

How can a builder claim for an extension of time? 

A builder can claim for an extension of time by giving written notice to an owner. An extension of time notice should include the following information: 

  • The period of time claimed for the extension of time – for example, 10 days 
  • Reason/s for the extension of time. For example, a variation to works, a suspension of works, inclement weather, owner’s delay or circumstances beyond the builder’s control. Any document supporting the reasons should also be included to show the owner that the entitlement is genuine. 
  • The owner’s name and address along with the job address. 

Extension of time forms are available to purchase from the HIA bookshop or your local stationary supplier. The forms are called ‘Notification of extension of time’. 

Giving the owner notice of an extension of time 

This notice can be given either by: 

  • delivering it to the owner in person 
  • posting it to the owner at the address which is set out in the Particulars of Contract (and the notice is deemed to have been given two clear business days after it was posted) 
  • faxing it (if that service is available): See clause 6 of the New Homes Contract (January 2020 version) and Alterations, Additions and Renovations (January 2020 version), or
  • emailing it to the owner's email address which is set out in the Particulars of Contract or last notified in writing.

The relevant clauses in the HIA Contracts for claiming an extension of time are as follows: 

  • Clause 34 – New Homes Contract (January 2020 version), and 
  • Clause 36 – Alterations, Additions and Renovations (January 2020 version). 

Disputes and extensions of time 

An owner has seven days (from receiving the builder’s notice) to dispute an extension of time. An owner must give the builder written notice, including detailed reasons why the owner disputes the claim. The onus is placed on an owner to dispute the extension of time being sought. 

If an owner fails to respond in the relevant form and within the timeframe the builder can argue that any objections was not valid. 

You should communicate an extension of time in accordance with the terms of the contract as soon as being aware of a possible delay. 

All documents and records of telephone conversations should be kept in the event the matter is referred to the Tribunal at some later stage. 


How can a builder claim for a variation? 

A variation to the scope of works (i.e. plans and/or specifications) can take place either at the request of the owner or builder. Once a request for a variation has been made the builder needs to follow up with a written variation notice. All variation requests must be signed and dated by an owner and builder prior to the works being undertaken. 

A variation notice should include the following information: 

  • Detail of the work(s) to be carried out or excluded from the contract, including any additional costs and credits due to the owner 
  • The period of time claimed for the additional works to be carried out – for example, 10 days 
  • Reason/s for the variation (required only if the variation has been requested by the builder). 

Variation forms are available to purchase from the HIA bookshop or your local stationary supplier. The forms are called ‘Variation document‘. 

The relevant clauses in the HIA Contracts for claiming a variation are as follows: 

  • Clause 23 – New Homes Contract (January 2020 version) 
  • Clause 26 – Alterations, Additions and Renovations (January 2020 version). 

What if the owner doesn’t agree to the variation?

If an owner refuses to sign a variation then the builder is not obliged to carry out the variation works, and can refuse to do so. 

The only times builders may do extra works without the owner signing the variation are in the following circumstances:

  • Where the works and/or materials are designated in the contract as a prime cost item or a provisional sum item (and this work is not a variation).
  • Where the owner asks for a variation in writing and the builder reasonably believes that the variation will not require a variation to the building permit, will not cause any delay and will not add more than 2% to the original contract price.
  • Where a builder is required out of circumstances beyond the builder’s control to carry out a variation by a building surveyor or other authorised person under the Building Act and the owner does not dispute the notice within five business days.

What if the builder carries out work without a signed variation?

Where a builder has failed to obtain a signed variation a builder risks not being paid for the work. Builders should naturally avoid being in such a situation.

To seek to enforce unsigned variations you may have to make a claim at VCAT. 

There are limited situations in which you may get paid for unsigned variations including:

  • if there are exceptional circumstances, or
  • the builder would suffer significant or exceptional hardship and it would not be unfair to the building owner,
  • there is a valid excuse why the paperwork was not done at the time and
  • there is irrefutable evidence that the owner knew of the exact work to be done and agreed to payment of the approximate amount payable for this work.

To find out more, contact HIA's Workplace Services team

Email us

Share with your network:

More articles on:

{{ tag.label }} {{ tag.label }} $vuetify.icons.faTimes
Find guides, how-tos, resources and more

Contracts Online 

The industry’s go-to digital platform. 

No matter the size of the job, a watertight building contract is critical to protect your business, and the current climate presents a great opportunity to go digital with your contracts.

Take me there

Business support


Supporting building professionals with custom built services and products.

  • Legal support
  • Contracts Online
  • Host an apprentice
  • Insurance services
  • Managing safety

Explore Business support