Skylight replacement material and labour takeoff guide in Australia

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

This guide follows one existing roof opening in Melbourne, 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 roofing contractor. Check the actual site, selected products, supplier figures and labour plan before issuing a client quote.

1. Define the measured job

Replace one roof window or skylight in the existing suitable opening, with matching flashing kit and interior edge repair. Measure the structural opening, roof covering type, pitch and interior reveal. 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 the structural opening, roof covering type, pitch and interior reveal. 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

Keep unit, manufacturer-matched flashing and interior finish allowance separate. This example has 7 distinct lines, including opening and access survey, temporary roof protection, old skylight removal. Use actual supplier prices and labour inputs for a customer job; the displayed amounts are fictional document inputs.

Choose before pricing: Keep unit, manufacturer-matched flashing and interior finish allowance separate. The fixture separates opening and access survey, temporary roof protection and old skylight removal rather than hiding all work in one figure.

3. Sequence the work and handoffs

Confirm product and safe roof access before removing the old unit. 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: Confirm product and safe roof access before removing the old unit. Note which stage needs access, a selected product or another trade before the next stage can be priced confidently.

4. Set a change boundary

Rotten curb or incompatible opening changes framing and waterproofing scope. The example excludes new roof opening, ceiling renovation or concealed structural repair. Record the discovery, agree the revised work and update the estimate before adding it to the job.

Change trigger: Rotten curb or incompatible opening changes framing and waterproofing scope. Record the revised task and quantity before it changes the amount your client sees.

Review the Australian job

Check access, substrate, drainage and product delivery at the property. Record weather and site conditions that affect the work, and confirm any design or approval requirements for the real scope.

Count the actual products, site visits and specialist tasks separately. This fixture is a document example, not a substitute for inspecting the building. The amounts are fictional AUD inputs, not current prices for Melbourne, Victoria or another location.

Worked project calculation

The paired PDF has 7 cost lines. For example, Old skylight removal is 1 each × A$398.75 = A$398.75; Skylight unit allowance is 1 each × A$1,443.75 = A$1,443.75. 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$4,152.50. 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

Replace one roof window or skylight in the existing suitable opening, with matching flashing kit and interior edge repair.

Outside this example: No new roof opening, ceiling renovation or concealed structural repair.

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 the structural opening, roof covering type, pitch and interior reveal.
• Keep unit, manufacturer-matched flashing and interior finish allowance separate.
• Confirm product and safe roof access before removing the old unit.
• Rotten curb or incompatible opening changes framing and waterproofing scope.

Check business and client details, address, dates, scope, units, line amounts and PDF notes. The skylight replacement 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 skylight replacement estimate?

Measure the structural opening, roof covering type, pitch and interior reveal.

When should this skylight replacement quote be revised?

Rotten curb or incompatible opening changes framing and waterproofing scope. No new roof opening, ceiling renovation or concealed structural repair.

Plain-text version · Browse all guides