How to Bid Plumbing on New Construction

Start with the current plans and specifications

• Confirm you have the current drawing set, specifications, addenda and fixture or equipment schedules.
• Identify the building areas, floors, phases and plumbing systems included in the request.
• List missing details, conflicts or unclear connections and request clarification before finalizing the scope.
• Check whether the documents identify the required materials, equipment, testing and inspection sequence.

Define the plumbing scope and quantities

• Separate underground piping, water distribution, waste and vent, fixtures and equipment connections so the work can be reviewed by phase.
• Estimate quantities from the plans, including pipe sizes and routes, fittings, fixtures, equipment and connection points.
• Review site access, existing conditions, staging, excavation needs and work that may be concealed by later trades.
• Confirm whether the bid request includes only installation or also coordination, submittals, testing, documentation or closeout.

Account for schedule and trade coordination

Review milestone dates, rough-in and finish sequences, inspection points, site access windows and the work of other trades. A plumbing scope can be priced accurately only when its sequence and dependencies are understood.

Ask who provides access, layout information, utility locations and inspection coordination. Record assumptions that affect labor, materials or sequencing.

Write down assumptions and exclusions

State what the price includes and identify unresolved items that may change the scope. Clarify responsibility for permits, excavation, demolition, concrete or wall patching, utility work, temporary services, after-hours work and supplied equipment instead of assuming they are included or excluded.

Separate confirmed work from allowances or items that need a site visit, revised drawing or written clarification.

What to send with a bid request

• Project address and property type
• Current plumbing plans, specifications and addenda
• Fixture and equipment schedules
• Requested scope, bid form and submission deadline
• Construction schedule, access instructions and site-contact details
• Known existing conditions or questions about the drawings

Common questions

What affects a new construction plumbing bid?

The defined scope, quantities, selected materials and equipment, access, schedule, existing site conditions, inspections and coordination requirements all affect the work to be priced.

Can plumbing work be priced from plans alone?

Plans provide a basis for estimating, but unclear documents, access limits or existing conditions may require clarification or a site review before the scope is final.

Should assumptions be included in a bid?

Yes. Written assumptions and exclusions make the scope easier to review and help identify items that need confirmation before work begins.