Accessible ventilation duct repair estimate scope checklist in Australia

By Estimates editorial team · Published 2026-09-25 · Australia edition

This guide follows one damaged duct run in Ballarat, Victoria. The matching itemised estimate and PDF show how the job brief becomes measured quantities and separate AUD amounts. The responsible role in this scenario is mechanical contractor. Check the actual site, selected products, supplier figures and labour plan before issuing a client quote.

1. Define the measured job

Repair an identified accessible ventilation duct section and reinstate insulation and supports without redesigning the full system. Measure damaged run, duct size, joint count and access height. Record the measurements and existing condition in the estimate before turning quantities into line items. The scope should make clear why this is a separate project from a broader renovation or maintenance quote.

Measure for this job: Measure damaged run, duct size, joint count and access height. Put that measured basis beside the relevant PDF lines so area, fitted length and product purchase quantities stay distinct.

2. Build a product and labour schedule

Separate replacement duct, sealant and insulation allowances. This example has 7 distinct lines, including duct inspection and access, damaged duct removal, replacement duct allowance. Use actual supplier prices and labour inputs for a customer job; the displayed amounts are fictional document inputs.

Choose before pricing: Separate replacement duct, sealant and insulation allowances. The fixture separates duct inspection and access, damaged duct removal and replacement duct allowance rather than hiding all work in one figure.

3. Sequence the work and handoffs

Inspect adjacent joints before cutting and verify airflow after repair. Show which task depends on access, a selected product or another trade. If that dependency is still open, label the price preliminary and identify the information needed before a firm quote.

Plan the handoffs: Inspect adjacent joints before cutting and verify airflow after repair. Note which stage needs access, a selected product or another trade before the next stage can be priced confidently.

4. Set a change boundary

Further inaccessible damage requires investigation beyond this local repair. The example excludes air-handler replacement, full duct cleaning or concealed ceiling restoration. Record the discovery, agree the revised work and update the estimate before adding it to the job.

Change trigger: Further inaccessible damage requires investigation beyond this local repair. Record the revised task and quantity before it changes the amount your client sees.

Review the Australian job

Inspect the existing surface, access, product schedule and handoff conditions. Resolve unknown work and confirm any specialist requirements before giving a client a final quote.

The damaged duct removal line uses 9.75 m. Keep the site measurement and supplier's selling unit together; a material purchase allowance can differ from installed coverage. The amounts are fictional AUD inputs, not current prices for Ballarat, Victoria or another location.

Worked project calculation

The paired PDF has 7 cost lines. For example, Damaged duct removal is 9.75 m × A$51.40 = A$501.15; Replacement duct allowance is 10.97 m × A$103.00 = A$1,129.91. Each amount comes from the stated quantity and unit rate, so you can trace the arithmetic back to the job scope.

Adding every exact-cent line gives A$3,879.34. The PDF uses a 0% tax input only to make its fictional arithmetic visible. Confirm the GST treatment that applies to the actual job and set your own markup before sharing a client quote. A fictional rate is a document input, not a market quote or a recommended selling price.

Scope and pricing boundaries

Repair an identified accessible ventilation duct section and reinstate insulation and supports without redesigning the full system.

Outside this example: No air-handler replacement, full duct cleaning or concealed ceiling restoration.

Separate product allowances, supply, installation, disposal and any specialist work where the actual project needs them. If access or a hidden condition changes, document the affected scope and agree a revised price instead of silently extending the base amount.

Before you send the estimate

• Measure damaged run, duct size, joint count and access height.
• Separate replacement duct, sealant and insulation allowances.
• Inspect adjacent joints before cutting and verify airflow after repair.
• Further inaccessible damage requires investigation beyond this local repair.

Check business and client details, address, dates, scope, units, line amounts and PDF notes. The accessible ventilation duct repair PDF example shows how this fictional project is presented. Its short PDF note is not a substitute for the detailed exclusions above.

Questions about this estimate

Which quantity controls this accessible ventilation duct repair estimate?

Measure damaged run, duct size, joint count and access height.

When should this accessible ventilation duct repair quote be revised?

Further inaccessible damage requires investigation beyond this local repair. No air-handler replacement, full duct cleaning or concealed ceiling restoration.

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