Written by Five Star Roofing | Published on June 2025
Before signing any commercial roofing contract, business owners should confirm three things upfront: the contractor holds a valid licence in your state, the contract includes a detailed written scope of work, and all warranty terms are clearly documented. A poorly written contract is one of the most common reasons commercial roofing projects run over budget or end in disputes across NSW, QLD, and ACT.
This guide walks you through the key contract clauses to scrutinise, questions to ask your contractor, red flags to avoid, and what the law requires in each state. Whether your building is in Sydney, Brisbane, or Canberra, the same due diligence applies.
Verify Contractor Licensing and Insurance Before Anything Else
In Australia, roofing contractors must hold a valid trade licence issued by the relevant state authority. Signing with an unlicensed contractor voids most manufacturer warranties and can expose your business to serious liability.
Here is what to check in each state:
- NSW: Contractors must hold a licence issued by NSW Fair Trading. For commercial roofing work over $5,000, a contractor licence under the Home Building Act is required.
- QLD: The Queensland Building and Construction Commission (QBCC) issues contractor licences. Verify the licence category covers roofing work specifically.
- ACT: The ACT Planning and Land Authority oversees building work. Contractors must hold an appropriate licence under the Construction Occupations (Licensing) Act 2004.
- Public Liability Insurance: Require a minimum of $10 million in public liability cover. Ask for a current certificate of currency, not just a verbal assurance.
- Workers Compensation: Any contractor sending workers to your site must carry workers compensation insurance. No exceptions.
You can verify QBCC licences online through the QBCC licence search tool. NSW licences are searchable through the Service NSW portal. ACT licences are verifiable through the Access Canberra website.
Five Star Roofing carries all required licences and insurances across NSW, QLD, and ACT. We provide documentation before any contract is signed.
Understand What the Scope of Work Must Include
A vague scope of work is where commercial roofing disputes begin. Every contract should describe exactly what work will be done, what materials will be used, and what is excluded. If it is not written down, assume it is not included.
A properly written scope of work for a commercial roof should include:
- The specific roofing system being installed or repaired (e.g., TPO membrane, Colorbond steel, modified bitumen)
- Brand names and product specifications for all primary materials
- Thickness or gauge of materials where relevant
- Details on how existing roofing will be handled (removed, recovered, or left in place)
- Work on penetrations, flashings, gutters, and downpipes
- Drainage and fall compliance with AS/NZS 3500.3
- Who is responsible for scaffolding, access, and traffic management
- Clean-up and waste disposal obligations
In Queensland, cyclone-rated fixings are often required under the National Construction Code (NCC) for commercial buildings in certain wind zones. Your scope of work should reference compliance with local wind load requirements explicitly.
If a contractor hands you a one-page quote as a contract, that is a red flag. Push for a full written scope before signing anything.
Compare Common Contract Types Used in Commercial Roofing
Not all commercial roofing contracts are structured the same way. Understanding the type of contract you are signing helps you manage risk and budget more accurately.
| Contract Type | How It Works | Best For | Risk Level |
|---|---|---|---|
| Lump Sum (Fixed Price) | One set price for the entire job | Well-defined scopes with clear specs | Low for client |
| Cost Plus | Client pays actual costs plus a contractor margin | Complex or unknown scope jobs | Higher for client |
| Unit Rate | Priced per square metre or per item | Staged or phased roofing projects | Medium |
| Maintenance Contract | Ongoing service agreement with scheduled visits | Large commercial properties and strata | Low ongoing risk |
| Design and Construct | Contractor handles both design and installation | New builds or full roof replacements | Low if contractor is experienced |
For most commercial roof replacements or major repairs in NSW and ACT, a lump sum contract provides the clearest budget certainty. Cost-plus arrangements can work well for heritage buildings in areas like The Rocks in Sydney or older commercial precincts in Canberra where hidden structural issues are common.
Review Warranty Terms Carefully
Warranties on commercial roofing come in two forms: the manufacturer product warranty and the contractor workmanship warranty. Both matter. A product warranty alone does not protect you if the installation was poor.
| Warranty Type | Who Provides It | Typical Duration | What It Covers |
|---|---|---|---|
| Manufacturer Product Warranty | Material manufacturer (e.g., Lysaght, Derbigum) | 10 to 25 years | Defects in the roofing material itself |
| Workmanship Warranty | Roofing contractor | 2 to 10 years | Defects caused by installation errors |
| System Warranty | Manufacturer plus approved installer | 10 to 20 years | Combined material and installation coverage |
System warranties are the strongest option. They are only available when a certified installer uses approved products. Ask your contractor if they are an accredited installer for the brand they are quoting. Lysaght, Bluescope, and Derbigum all offer system warranties through approved contractors in Australia.
Check the warranty for exclusions. Common exclusions include damage caused by foot traffic, equipment installed post-construction, and extreme weather events classified as Acts of God. In Queensland, hail and cyclone damage exclusions are worth reading carefully given local weather conditions.
Five Star Roofing provides a written workmanship warranty on all commercial roofing projects. Ask us about system warranty options when you request a quote.
Know Your Rights Around Payment Terms and Progress Claims
Payment disputes are one of the most common problems in commercial construction in Australia. Understanding your legal rights before you sign protects your cash flow and gives you leverage if things go wrong.
Key payment points to confirm in any commercial roofing contract:
- Deposit amount: A reasonable deposit for commercial roofing is 10 to 20 percent. Be cautious of contractors asking for more than 30 percent upfront.
- Progress payment schedule: Payments should be tied to measurable milestones, not arbitrary dates. For example, payment on completion of structural work, then on membrane installation, then on final inspection.
- Retention: It is common to hold back 5 to 10 percent of the contract value until the defects liability period ends. Ensure this is written into the contract.
- Security of Payment legislation: NSW, QLD, and ACT all have Security of Payment Acts that give subcontractors and contractors the right to make progress claims. Understand your obligations as a paying party.
- Variations: Any changes to the original scope should be approved in writing before work proceeds. Verbal approvals for variations are a common source of invoice disputes.
In NSW, the Building and Construction Industry Security of Payment Act 1999 applies to most commercial building contracts. QLD operates under the Building Industry Fairness (Security of Payment) Act 2017, and the ACT uses the Building and Construction Industry (Security of Payment) Act 2009.
If a contractor presents you with a payment claim under these acts, you have a strict timeframe to respond. Missing that window can result in the full amount becoming payable regardless of disputes.
Identify Red Flags in a Commercial Roofing Contract
Some contract terms seem routine but actually shift significant risk onto you as the business owner. Here are the clauses and situations that should give you pause before signing.
- No written scope: If the scope of work is vague or verbal, the contractor can charge extra for anything not explicitly listed.
- Unlimited variation rights: Some contracts allow contractors to raise the price for unforeseen conditions without a cap. Push for a provisional sum arrangement with a defined limit instead.
- No completion date: Without a documented completion date or milestone schedule, there is no mechanism to hold the contractor accountable for delays.
- Unlimited access rights: Broad access clauses can disrupt your business operations. Specify working hours, access routes, and areas off-limits to workers.
- Unclear defects liability period: The defects liability period (typically 12 months from practical completion) should be stated explicitly. If it is not, you may have limited recourse for post-completion issues.
- No dispute resolution clause: A good contract outlines how disputes will be handled, whether through mediation, adjudication under security of payment legislation, or a tribunal.
- Licence and insurance not provided upfront: If a contractor refuses to provide licence and insurance documentation before you sign, walk away.
Getting a commercial solicitor to review a contract before signing is worth the cost for projects over $50,000. The few hundred dollars spent on a legal review can save you significantly more in disputes down the track.
FAQs on Commercial Roofing Contracts
How long does a commercial roofing contract usually take to complete?
Timelines vary depending on roof size, system type, and site conditions. A standard commercial re-roofing project in NSW or QLD typically takes between one and six weeks. Larger or more complex builds can run longer. Your contract should include a documented program with key milestones.
Can I negotiate the terms of a commercial roofing contract?
Yes, and you should. Most contractors expect some negotiation on payment schedules, defects liability periods, and access arrangements. Negotiating does not mean driving the price down at the expense of quality. It means ensuring the contract is balanced and fair for both parties.
What happens if the contractor finds unexpected damage during the job?
Unexpected conditions such as rotted decking or corroded structural members are handled through variations or provisional sums. A well-written contract will include a process for identifying, pricing, and approving variations before the additional work begins. Never allow verbal approvals for extra work.
Is a manufacturer warranty enough to protect my commercial property?
No. A manufacturer warranty only covers defects in the product itself. If the roofing fails due to poor installation, the product warranty typically does not apply. You need a separate workmanship warranty from the contractor, or a system warranty that covers both material and labour.
Do commercial roofing contracts need to comply with the National Construction Code?
Yes. All commercial roofing work in NSW, QLD, and ACT must comply with the National Construction Code (NCC). Your contract should reference NCC compliance and specify which edition applies. Non-compliant work can create problems with building insurance and future property sales.
What should I do if there is a dispute with my roofing contractor?
Start with the dispute resolution clause in your contract. If that does not resolve the issue, NSW Fair Trading, the QBCC, and Access Canberra all offer complaint and mediation services for building disputes. Security of Payment legislation also provides a fast-track adjudication process for payment-related disputes.
Wrap Up and Next Steps
A commercial roofing contract protects both parties when it is written clearly and reviewed carefully. The key priorities are confirming licensing and insurance, insisting on a detailed scope of work, understanding warranty coverage, and knowing your rights under local security of payment legislation in NSW, QLD, or ACT.
Five Star Roofing works with commercial clients across Sydney, Brisbane, Canberra, and surrounds. We provide transparent contracts, licensed tradespeople, and full documentation before any project starts.
Call us today on +64211234567 to request a commercial roofing quote or to have one of our team review your current contract requirements. We are here to make the process straightforward for your business.
