Most building delays do not begin with one dramatic moment. They start with a vague text, a promised Monday that turns into next week, or a stage that feels nearly done for far too long. Nobody wants to overreact too early, but waiting too long can leave you drifting through a job with no real dates and no clear explanation for where the time went.
Here’s how to handle a building job that feels like it is slipping, what the official guidance says about delays and extensions of time, and how to separate a reasonable delay from a job drifting without a plan.
First work out whether the job is actually late
The first trap is going by vibe instead of by contract. A job can feel slow without yet being contractually late. That is frustrating, but it is not the same thing. Consumer Affairs Victoria says a domestic building contract should state either the start date or how the start date will be determined. It also needs to make room for delays that were reasonably allowed for. So before you start arguing about delay, work out what the contract actually says about commencement, completion, and any stated allowances. If you do not know the contractual date you are measuring against, you are starting halfway through the problem.
Read the start date properly, not emotionally
This is where lots of customers get caught. The contract may not say “work starts on 12 May”. It may say the start date is a set number of days after finance approval, after the building permit, or after the builder gets the final document they need. Victoria’s guidance gives exactly that kind of example. So if the builder is saying the job has not formally started yet, check whether that is true before calling it a delay. At the same time, if all the preconditions were met weeks ago and nobody is moving, that is useful information too. Clarity beats annoyance here.
A good contract already allows for some delays
Not every delay is a breach. Victoria says builders must make reasonable allowance in the contract for things like inclement weather, public holidays, rostered days off, curing time, and other delays that are foreseeable from the nature of the work. Queensland says builders should allow for delays that are reasonably foreseeable and within their reasonable control when they set the contract dates. NSW home building contract guidance also expects progress payments to relate to work actually done and for time extensions to be dealt with under the contract. The practical point is simple: rain in wet season is not a surprise. Neither is time needed for concrete to cure.
An extension of time should come in writing
If the builder wants more time, that should not be handled as a loose verbal understanding. In Queensland, official guidance says an extension of time request must be given to the owner in writing within 10 business days of the builder becoming aware, or when they reasonably ought to have become aware, of the cause and extent of the delay. NSW standard contract guidance expects written notice of the cause and estimated length of delay. That is the standard you should expect generally, even outside those exact systems. If time is moving, the reason, the number of days, and the revised target should all be on paper.
Owner-caused delays still count as delays
This part matters because customers are not always innocent bystanders. Variations can cause delay. Late selections can cause delay. Slow finance, late access, missing owner-supplied items, and site interference can all cause delay too. Victoria’s construction checklist says if you fail to provide items on time, the builder may be entitled to suspend work and recover delay costs if they notify you properly. Queensland’s extension guidance also recognises owner-caused delays and variations as reasons a builder may seek more time. If you want the moral high ground in a delay argument, make sure you have actually earned it.
Reasonable cause is not the same as no explanation
Builders do not have to control the weather, product shortages, or every upstream problem in the industry. But they do have to communicate properly. A delay may be reasonable if it is beyond the builder’s control and could not have been foreseen when the contract was made. That does not entitle anyone to disappear into silence. If the answer to “what is causing the delay and what does it do to the date” is always fuzzy, you are no longer dealing with a reasonable delay. You are dealing with weak job management, which is a different problem entirely.
Keep a paper trail while the relationship is still repairable
The best time to tidy the paper trail is before the dispute becomes personal. Keep the contract, the program, the approved variations, the extension requests, and the message trail where dates were discussed. If the builder says the job slipped because of a variation, check that the variation was actually documented. If they say the delay is weather, ask how many days and against what contract allowance. If they say materials, ask what changed and when they first knew. Calm written questions are much more useful than heated phone calls built on memory.
Know when to stop waiting politely
There comes a point where patience stops being sensible and starts becoming permission. If the builder will not put the cause of delay in writing, will not identify the revised completion date, or keeps letting the explanation change, stop treating it like a minor wobble. Ask the question directly: what clause, what cause, how many days, and what is the new practical completion date. If you still do not get a clear answer, move to formal written notice and get advice on the dispute options in your state. Good jobs can hit trouble. They should still be able to explain themselves.
When a building job starts slipping, do not jump straight to panic, but do not let vagueness become the new normal either. Check the contract dates properly, insist that delay claims and time extensions be put in writing, and keep your own side of the job organised. A reasonable delay can usually be explained. A drifting job usually can’t.