What to include in a rainwater collection tank installation quote in Australia

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

This guide follows one garden water-storage tank in Toowoomba, Queensland. 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 plumbing contractor. Check the actual site, selected products, supplier figures and labour plan before issuing a client quote.

1. Define the measured job

Install one selected above-ground rainwater collection tank on a prepared base and connect it to a suitable downpipe for non-potable use. Measure tank footprint, overflow route, downpipe position and service access. 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 tank footprint, overflow route, downpipe position and service access. 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 tank, base materials and diversion fittings; document capacity as the selected product. This example has 7 distinct lines, including location and overflow survey, base preparation, tank allowance. Use actual supplier prices and labour inputs for a customer job; the displayed amounts are fictional document inputs.

Choose before pricing: Separate tank, base materials and diversion fittings; document capacity as the selected product. The fixture separates location and overflow survey, base preparation and tank allowance rather than hiding all work in one figure.

3. Sequence the work and handoffs

Confirm ground bearing and a safe overflow path before placing the tank. 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 ground bearing and a safe overflow path before placing the tank. Note which stage needs access, a selected product or another trade before the next stage can be priced confidently.

4. Set a change boundary

A poor base location or no suitable overflow can change siting and connection. The example excludes drinking-water connection, pump system or buried storage excavation. Record the discovery, agree the revised work and update the estimate before adding it to the job.

Change trigger: A poor base location or no suitable overflow can change siting and connection. Record the revised task and quantity before it changes the amount your client sees.

Review the Australian job

Verify the existing water and waste connections, access and selected fittings on site. Assign any specialist work and check approval requirements that apply to the actual address.

The tank placement labour line counts 5 hours. Verify the actual locations and product schedule rather than carrying this fictional count into another property. The amounts are fictional AUD inputs, not current prices for Toowoomba, Queensland or another location.

Worked project calculation

The paired PDF has 7 cost lines. For example, Tank allowance is 1 each × A$1,258.00 = A$1,258.00; Downpipe diversion kit is 1 set × A$236.80 = A$236.80. 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$3,307.80. 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

Install one selected above-ground rainwater collection tank on a prepared base and connect it to a suitable downpipe for non-potable use.

Outside this example: No drinking-water connection, pump system or buried storage excavation.

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 tank footprint, overflow route, downpipe position and service access.
• Separate tank, base materials and diversion fittings; document capacity as the selected product.
• Confirm ground bearing and a safe overflow path before placing the tank.
• A poor base location or no suitable overflow can change siting and connection.

Check business and client details, address, dates, scope, units, line amounts and PDF notes. The rainwater tank installation 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 rainwater collection tank installation estimate?

Measure tank footprint, overflow route, downpipe position and service access.

When should this rainwater collection tank installation quote be revised?

A poor base location or no suitable overflow can change siting and connection. No drinking-water connection, pump system or buried storage excavation.

Plain-text version · Browse all guides