7 Red Flags to Check Before Signing an HIA Building Contract in NSW
HIA building contracts routinely run past 60 pages, and the clauses most likely to cost you money are rarely on the first few. Before you sign, these are the seven areas we see catch NSW home owners out most often.
1. Prime cost items and provisional sums
Prime cost (PC) items and provisional sums are allowances for things not fully priced when the contract is signed — tapware, tiles, site works and the like. If the allowances are set unrealistically low, the contract price looks attractive but the real cost lands on you later as an adjustment.
Check every PC item and provisional sum against real market prices. An allowance of $30 per square metre for tiling, for example, buys very little in today's market.
2. Variation clauses
Variations are the single biggest source of disputes on residential builds. Look closely at who can initiate a variation, how it must be documented, what margin the builder adds, and whether you can be charged for variations you never approved in writing.
3. Delay damages and extension of time claims
Most contracts let the builder claim extensions of time for weather, supply delays and more. What matters is whether the notice requirements are enforced, and what compensation — if any — you receive when the build runs months past the contract period.
4. Cost escalation clauses
Some contracts include rise-and-fall or cost escalation clauses that let the builder pass on increases in material or labour costs. On a long build this can add tens of thousands of dollars. Make sure you understand exactly when and how the price can move after signing.
5. Progress payment schedule
NSW law caps the deposit and requires progress payments to reflect work actually completed. A payment schedule that is front-loaded — where you pay a large share of the price early in the build — shifts risk onto you if anything goes wrong.
6. Missing or vague inclusions
The contract documents should describe precisely what you are getting: brands, models, finishes and quantities. Vague wording like 'standard range' or 'builder's selection' leaves the door open for downgrades you never agreed to.
7. Special conditions that override your protections
Builders often attach special conditions that amend the standard HIA terms — and they rarely amend them in your favour. Special conditions deserve more scrutiny than any other page of the contract.
Frequently Asked Questions
Should I get a HIA contract reviewed before signing in NSW?
Yes. HIA contracts routinely run past 60 pages, and the clauses most likely to cost you money — variations, prime cost items, provisional sums, delay provisions and special conditions — are rarely obvious. An independent review before signing typically costs a few hundred dollars and routinely identifies risks worth tens of thousands. Helios Project Management offers a fixed-fee HIA contract review at $880 inc. GST with a written report within 48 hours of receiving your documents.
What are prime cost items and provisional sums in a HIA contract?
Prime cost (PC) items and provisional sums are allowances for parts of the build not fully priced when the contract is signed — tapware, tiles, site works and similar. If the allowances are set unrealistically low, the contract price looks attractive but the real cost lands on you later as an adjustment. Every allowance should be checked against realistic market pricing before you sign.
What is the biggest red flag in a building contract?
Special conditions that override the standard HIA protections are the most dangerous part of most contracts, because builders rarely amend the standard terms in the owner's favour. Close behind are vague variation clauses, cost escalation clauses, and front-loaded payment schedules that put your money ahead of the work.
Can a builder charge me for variations I never approved in writing?
Most residential building contracts require variations to be documented in writing, priced and approved before the work is done. Whether a builder can recover payment for unapproved variations depends on the contract wording and the circumstances — which is exactly why the variation clause deserves scrutiny before you sign, not after the first dispute.
How much does a HIA contract review cost in NSW?
Helios Project Management reviews HIA, MBA, ABIC and custom building contracts for a fixed fee of $880 inc. GST, NSW-wide. The review is clause-by-clause and includes a personalised written risk report within 48 hours of receiving your documents, plus phone and email support to walk through the findings.