In construction, a tender is a formal process where a client invites builders to submit a price and proposal to deliver a project. The submission itself is also commonly called “a tender.” Tendering is the structured way of asking:
-How much will this project cost?
-How long will it take?
-How will you deliver it?
For clients, tendering matters because it’s often the point where a project shifts from idea into real commitments around budget, scope, timeline, and risk.
Tender vs quote – what’s the difference?
People sometimes use “quote” and “tender” interchangeably, but in practice they often differ in formality and detail.
A quote is a simpler price offered for a defined scope which is common in smaller residential builds.
A tender is more formal and detailed, often used for larger residential builds and most commercial projects. A tender typically includes not only a number, but also the builder’s methodology, assumptions, exclusions, program, and capability info.
If you’re a homeowner, you may still go through a tender phase even if it doesn’t look like a government-style tender. Your builder may present a tender document that summarises the inclusions, allowances, and costs before your sign.
What tendering means
Tendering is the process of preparing and evaluating offers. The client provides information to be costed. Builders then assess the documents, obtain subcontractor pricing, and submit a tender response. The client compares submissions, clarifies differences, and chooses a builder to work with.
Common types of tenders
Clients will come across different tender approaches depending on the project size and procurement style.
An open tender is where many builders are invited to submit. This is common in public sector procurement and some large private projects. It can create strong competition, but it can also produce wide price differences if builders interpret the scope differently.
A select tender invited tender is where only a shortlist of builders is asked to price. This is common for private clients who want builders with relevant experience such as a commercial investor choosing contractors with proven track record in similar projects.
A negotiated tender is where the client works with one builder to develop scope and price, often iterating until it’s ready for contract. This can be efficient when time matters or when early contractor input is valuable.
What a tender usually includes
Tender documents vary, but a good tender response usually gives you enough information to compare apples with apples, not just totals. Typically, you’ll see the price, scope notes, and details that explain what’s included and what assumptions were made.
Information often includes:
- what is explicitly included and excluded
- any allowances such as provisional sums or prime cost items
- the proposed timeline and any constraints
- key assumptions about site conditions, access, working hours, or approvals
- how variations will be handled if scope changes after signing
A quick note on variations: In construction, a variation is a change to the original contract scope after the contract is signed. It can be initiated by the client regarding upgrading finishes or changing the layout or required due to site conditions or compliance requirements such as unexpected ground conditions, engineering changes, or authority requests.
Variations usually affect cost, time, or both. A well-managed variation process clearly documents what is changing, the price difference, and any impact on the construction schedule, then gets written approval before the work proceeds.
Why the cheapest tender isn’t always the best value
Clients often assume tendering is about finding the lowest price. The goal is usually to find the best overall outcome price, quality, timing, and certainty.
Two tenders can have the same total price but very different risk profiles. One might have clear inclusions and realistic allowances, while another might look cheaper because important items are excluded, which can surface later as variations. Tender comparisons only work when you understand what each builder assumed.
Tendering for home builds vs commercial projects
For homeowners, tendering is often about what you’re getting, how finishes are defined, and how variations are controlled. Many of the biggest budget issues in residential construction come from decisions made at tender stage when allowances are set and inclusions/exclusions are agreed.
For commercial investors and developers, tendering tends to be more structured. You’ll often evaluate capability, program, methodology, safety systems, and reporting cadence alongside price. Commercial tendering is also where clients set expectations around site access, disruption management, after-hours work, and how claims/variations will be documented.
Conclusion
A good tender process helps you make a confident decision on which builder to choose for your project.
If you’re planning a custom home build or a commercial project and want to find out the best way forward, including cost estimating, time to build, approvals and more, contact IQ Construction today!
(08) 9399 6715