Two quotes can carry different totals because they are pricing different information—not necessarily because one builder is dearer.
Before treating the bottom line as comparable, understand the scope, documentation, assumptions, allowances, exclusions and site knowledge that produced it.
This is general demonstration content, not legal, financial, engineering or building advice. Queensland contract and insurance requirements should be checked with the QBCC and appropriate advisers.
1. The drawings must describe the same building.
Concept drawings can communicate arrangement and appearance without resolving structure, waterproofing, services, selections or site works. A builder pricing at concept stage must either investigate, carry allowances or make assumptions. Those assumptions should be visible.
2. The site changes the price.
Access, slope, demolition, retaining, vegetation, services, soil and working space all affect how the same design is delivered. For renovations, existing condition adds another layer. A site visit, survey and appropriate investigation improve the usefulness of the price.
3. An allowance is not an inclusion.
Prime cost items and provisional sums can be necessary where a selection or scope is not final. They are not automatically a problem; the risk lies in an amount that is unrealistic or poorly explained. Ask what quantity, quality and work the allowance assumes.
4. Exclusions belong beside inclusions.
A clear proposal explains what is outside the price: professional fees, authority charges, landscaping, utility upgrades, window coverings, specialist equipment or owner-supplied work, for example. The list will vary by project.
5. Compare the process after the number.
Price does not describe how selections are recorded, variations approved, updates delivered, defects managed or handover organised. These activities have real value during a long project and should be assessed alongside the physical scope.
A useful next step
Before requesting a construction quote, ask whether the project has enough information to price reliably. A paid feasibility or pre-construction stage can be more honest—and ultimately more useful—than multiple premature free estimates.
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