A plumbing tender price needs to reflect the actual scope, quantities, labour requirements, and material costs in the project documentation. 

Before submitting a tender, contractors can review the plumbing cost build-up to check whether the price reflects the current scope and includes the major cost components. 

This review matters on commercial projects where drawings, specifications, supplier quotations and revisions can all affect the tender price. 

Check the Quantities and Current Scope 

Start by confirming that the quantities used in the price reflect the current tender documentation. 

Check the takeoff against the latest drawings, schedules and addenda. Depending on the project, this can include water services, sanitary pipework, sewer and drainage, stormwater, fixtures, hydrants, underground services, pits and associated equipment. 

Trace each revision through the measured quantities. A change to a pipe route, fixture schedule or drainage layout can affect material quantities and labour requirements. 

Check the scope across the drawings and specifications. An item shown on a drawing may have additional requirements in the specification. A scheduled item may also require further review before you can price it correctly. 

Review Material and Labour Costs 

Reconcile material pricing against the products and installation requirements specified for the project. 

Supplier quotations can provide the basis for material costs. However, check them against the measured quantities and complete scope. Identify exclusions, substitutions, accessories, fittings, supports, insulation, freight and other items that the quotation does not cover before you finalise the price. 

Next, review labour against the actual installation conditions. 

Building height, access restrictions, service congestion, excavation conditions, installation methods, staging and coordination with other trades can all affect productivity. A standard labour rate can provide a starting point. It should not replace a project-specific assessment of the work. 

For example, services in an accessible commercial area may require a different labour allowance from work within congested ceiling spaces or restricted plant areas. 

Check for Missing Costs and Scope Gaps 

Check the completed plumbing cost breakdown for items that may have been missed across the drawings, specifications and schedules. 

Depending on the documented scope, these items can include testing and commissioning, connections, valves, penetrations, supports, excavation and backfilling, reinstatement, builder work and trade interfaces. 

Each item may represent a relatively small cost. Several omissions, however, can materially affect the final tender price. 

Also identify any unresolved assumptions. If the documentation is unclear or supplier pricing does not cover a required item, clarify the issue or address it through an appropriate tender qualification. Do not leave it as an unpriced assumption. 

Review the Price Before Tender Submission 

Apply the margin after reviewing the underlying project costs. 

If quantities are incomplete, supplier pricing is missing or labour allowances do not reflect the installation conditions; changing the margin will not correct the underlying pricing issue. 

The final review should confirm that the price reflects the current drawings, specifications, addenda, measured quantities, supplier pricing, labour requirements, exclusions, and commercial conditions. 

A useful final check is straightforward: does the price account for the work shown and specified in the current tender documentation? 

For commercial plumbing and civil drainage projects requiring detailed scope review, quantity measurement and project-specific pricing, ePlumbing Estimators provides tender estimating support across Australia.