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鈥斅犅4 min read

Construction Purchase Orders 101: A Contractor鈥檚 Guide to POs

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Last Updated Jul 25, 2025

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2 contractors wearing PPE at construction site surveying amount of concrete needed for concrete pour

Construction purchase orders are key financial elements of an overall project contract. In construction specifically, a purchase order (PO) is typically validated by two parties: the buyer and seller. The buyer (usually an owner or head contractor) issues a PO to the seller (usually a head contractor or speciality contractor) to cover the cost of the project. 

The document outlines the price and quantity of goods or services necessary to complete the project contract as agreed upon by both parties. 

Table of contents

Information in a Construction Purchase Order

In order to illustrate the contents of a construction purchase order and how they are relevant to the completion of a project, let鈥檚 use a hypothetical scenario featuring Jane and John. Let鈥檚 say Jane is a project manager at a HC hired to build a warehouse while John is a concrete contractor who won the tender to pour the foundation of that warehouse.

Description of Deliverables

Upon receiving the tender for the concrete pour, John and his team visit the site. They identify the tools, equipment, materials and labour needed to complete the project. Once he relays that information to the HC, Jane鈥檚 team will draft a PO for the deliverables outlined by John and his team. 

Number of Deliverables

As Jane鈥檚 team is drafting the PO, they have to be diligent with listing the quantities for each deliverable provided by John. This is important because a PO explicitly states the HC鈥檚 fiscal responsibility for the deliverables needed to complete the work expected of the speciality contractor. This document, therefore, protects both parties by ensuring that:

  1. The HC receives the amount and quality of work requested.
  2. The SC gets paid for the items needed to complete the work requested.

Agreed-Upon Cost

As Jane鈥檚 team lays out the itemised list of deliverables requested by John鈥檚 team, the two parties will agree on a cost per item and possible discounts for certain quantities of those items. 

Terms of Payment

The terms of payment for a construction purchase order are usually based on credit. The HC sends the PO to the SC to request a service on credit. This protects the HC in the event that payment is given before the completion of the project. 

The terms of payment can also be set in regards to a net payment term. It defines how many days after a progress claim is submitted the buyer has to make the payment. In this scenario, we will say that Jane approves a PO with a net 30 term, which means John will be paid within 30 days of submitting a progress claim for the completed work. 

Due Dates

Now that the parties have agreed to the terms of payment, Jane and Johns鈥 teams will decide on due dates for the deliverables requested in the PO. These dates will inform the date of delivery of those deliverables.  

Method of Delivery

One of John鈥檚 deliverables in the PO is an extra concrete mixer that has to be delivered from a different territory. The delivery method for that mixer will typically be defined as one of two FOB (Free On Board) shipping terms: FOB Shipping Point (or FOB Origin) and FOB Destination. If 鈥淔OB Origin鈥 is agreed upon, the HC will become responsible for any loss or damages incurred to the mixer as soon as it leaves the warehouse and is in transit to the worksite. If 鈥淔OB Destination鈥 is agreed upon, the SC will be responsible for any damage incurred to the mixer until it reaches the worksite. 

Reference Numbers

The reference number is one of the most important pieces of the construction purchase order鈥攊t helps track the document. Since a project can have hundreds of PO鈥檚 attached to it, they can commonly become lost or jumbled during a project鈥檚 lifetime. The only way to prove that a service or material was completed or delivered as requested is to be able to locate the respective PO by its reference number. 

Purchase Order vs Progress Claim

There is one main difference between a construction purchase order and a progress claim. A PO is submitted by the buyer (Jane the HC) to determine the cost of a contract before the work is completed. In contrast,  a progress claim is submitted by the seller (John the SC) after the work is completed to receive an agreed-upon payment.

Purchase Order vs Contract

The difference between a construction purchase order and a contract is that a contract is a legally binding document that covers products, agreed prices and payment terms, and conditions for the entirety of a construction project. It includes all necessary purchase orders (documents that outline the price and quantity of goods or services necessary to complete the project contract) and progress claims.

Pay Attention to PO Details

A construction purchase order is a key item in a project contract because it鈥檚 a legally binding document that protects both the buyer and seller of a product or service. When drafting a PO, it鈥檚 important to remember to be explicit and detailed when filling out the following sections:

  • Description of deliverables,
  • Number (or quantity) of deliverables,
  • Agreed-upon cost,
  • Terms of payment,
  • Due dates,
  • Method of delivery,
  • Reference Numbers.

See what鈥檚 coming in construction over the next decade.

Download the Future State of Construction Report for insights, trends, and innovations shaping the industry over the next 8鈥10 years.

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Written by

Emma De Francesco

18 articles

Emma is currently Strategic Product Consultant at 麻豆视频 where she loves partnering with clients to help them achieve the best possible results. She has worked as a Project Manager in previous roles, responsible for overseeing small to medium-sized projects across various sectors including commercial, health and lifestyle, retail, government and hotels. Throughout these projects, she managed everything from project costs, program and quality & safety, to design management, procurement, and authority approvals.

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