Roofing budget
Build a planning range using measured area and your own installed rates.
Quantity / scenario planning · Reviewed 7 October 2026Your inputs
Check all starting values against your project and product. Enter your own prices; keep costs on the same GST basis.
How to prepare your inputs
Use professional measurements or drawings. Roof surface area differs from horizontal catchment area; check which the tool needs.
How this calculation works
Net area = length × width. Budget range = area × your installed rates + extras.
24 m² at $200–$300/m² with $500 extras gives $5,300–$7,700.
Assumptions & exclusions
Enter measured roof surface dimensions, not the building footprint. Does not model roof pitch. Use professional measurements; do not climb onto a roof.
Your next step
Confirm pitch suitability, laps, flashings, access and drainage design with the roofing contractor.
Further reading
- Lysaght technical installation manual
These resources provide background information. Confirm current product specifications and project requirements with your supplier or trade professional.
What if my shape or product is different?
Use dimensions and product data that match the stated method. For complex work, calculate separate sections or obtain a project-specific take-off. Do not apply simple geometry to structural or compliance decisions.
Why are quantities rounded up?
Whole bags, packs, sheets or cartridges round up to purchasable units. Decimal area or volume results are planning figures; confirm order increments with the supplier.
Are my entries saved?
No. Entries remain in the current browser page and clear on reload. Printing can save your results and inputs as a PDF on your device.
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