Gather the property location, what you know about the existing roof, useful ground-level photos, any plans or measurements you already have, and the outcome you want. Then compare quotes on what is included — removal, scaffold, flashings, underlay, repairs and GST — not only the final number.
1. Start with the problem, not the product
Describe what is happening: roof age if known, leaks, visible corrosion, damaged tiles, a planned extension, insurance work, or simply that the roof appears to be reaching the end of its serviceable life. The contractor can then assess whether the likely solution is repair, partial work or replacement.
2. Give enough context for the site visit
Useful information includes the suburb/town, building type, known roof material, number of storeys, approximate roof area, access constraints, existing solar/skylights/chimneys and photos taken safely from ground level. Plans are useful when available.
- Property location
- Roof type if known
- Approximate area or plans
- Safe ground-level photos
- Leaks or visible damage
- Timing constraints
- Access / hillside issues
- Renovation context
3. Compare the scope, not just the bottom line
Two totals can differ because one includes work the other leaves out. Check whether the quote includes removal and disposal, scaffold or edge protection, underlay, flashings, fixings, gutters/downpipes, penetrations, freight and GST.
For reroofing, RoofHub's re-roof cost guide shows why removal and access should remain separate cost layers.
4. Keep unknowns visible
Some issues cannot be confirmed before strip-off — rotten timber, hidden substrate damage or asbestos risk are common examples. A good quote or estimate should say how those unknowns will be handled rather than silently assuming they cost nothing.
5. Identify older roofing risks before disturbing them
WorkSafe lists roofing products such as Decramastic tiles among materials roofers may encounter with asbestos. If an older roof may contain asbestos, assessment/testing can be required before normal removal work proceeds.
6. Ask what happens if the scope changes
Clarify how variations are approved, how weather delays are handled, what warranties apply, how the site is protected, and whether specialist work or additional approvals may be needed.
Bring measurements if you have them
Turn the project into a structured estimate.
Use actual measurements or trace a plan, then keep the selected roof system, removal scope and access assumptions in one project.
Open detailed estimatorSource
- primaryWorkSafe — Check for asbestos before work on older roofs (2026) — Includes a decramastic-roof case and asbestos risk reminder · government