Iowa Code Chapter 26: Bid Thresholds, Bonds, and Awards

Iowa’s construction bidding procedures are set by Iowa Code Chapter 26, the Construction Bidding Procedures Act. The rule at the center of it is simple: when a public improvement project is estimated to cost more than $100,000 (a figure that adjusts periodically), the governmental entity has to advertise for and open sealed competitive bids before awarding the contract.¹ Everything else in the chapter — notice timing, bid security, hearings, how the winner is chosen — flows from that requirement, and skipping any of it can void the contract.

Which Projects Are Covered

Chapter 26 applies to building or construction work built under the control of a governmental entity and paid for wholly or partly with public funds. That includes the state, counties, cities, and public school corporations. It does not include the Iowa Board of Regents or the Iowa Department of Transportation, both of which follow their own procurement rules.²

Several types of work are excluded from the definition of a “public improvement” and therefore fall outside Chapter 26 altogether:

Emergency work that must be done immediately to protect public safety or prevent further damage.
Maintenance or repair work performed by the governmental entity’s own employees.
Highway, bridge, and culvert projects, which are governed by separate chapters of the Iowa Code.
Construction, repair, or maintenance performed by employees of a city utility under Chapter 388 or a rural water district under Chapter 357A.
Urban renewal demolition, low-rent housing, and industrial aid projects, each with its own procurement framework.

The emergency work carveout is the only route around competitive bidding, and it works by definition rather than by exception. There is no separate provision that lets an entity skip the process after the fact.² If the work does not genuinely qualify as emergency work, urgency alone will not excuse a failure to bid.

The Two Thresholds: Competitive Bids and Competitive Quotations

The statutory base threshold for full competitive sealed bidding is $100,000. Iowa Code Section 314.1B directs the Iowa DOT director to review that number periodically and adjust it for construction cost changes. Adjustments are published by September 1 and take effect the following January 1, can go up but never below the base amount.³ Before you rely on $100,000, check the current adjusted figure.

Projects below the sealed-bid threshold but still involving meaningful public spending fall under Section 26.14, which requires competitive quotations. That is a lighter process than full sealed bidding, but it still requires price competition, and its thresholds are adjusted under the same Section 314.1B mechanism.³ The result is a two-tier system: larger projects go through sealed bidding, mid-range projects go through competitive quotations, and only the smallest projects escape both.

Design services are outside both tiers. Architectural, landscape architectural, and engineering design services procured for a public improvement are not subject to competitive bidding or competitive quotation requirements.²

Advertising the Project and Holding the Public Hearing

Once a project crosses the sealed-bid threshold, the governmental entity has to publish notice in three places: a contractor plan room service with statewide circulation, a construction lead generating service with statewide circulation, and an internet site sponsored by a governmental entity or a statewide association representing it. The notice must be posted at least 13 days, but no more than 45 days, before the deadline for filing bids.¹

Under Section 26.7, the notice has to state when and where sealed proposals are filed, when and where they will be opened, a description of the project, a general timeline for when work must begin and end, and a statement that each bidder must submit bid security. The entity can add anything else it considers relevant.²

Local governmental entities — not the state — have to clear one more step before signing. Under Section 26.12, the entity cannot enter into a contract until it holds a public hearing and formally approves the plans, specifications, form of contract, and estimated total cost. Notice of the hearing is published, anyone can appear and file objections, and the entity’s decision after hearing objections is entered by resolution.⁴

Bid Security and Performance Bonds

Every bidder submits bid security with its proposal. The governmental entity sets the required amount before publishing the notice, and it must be between 5 percent and 10 percent of either the estimated total contract cost or the bid amount. Acceptable forms are a cashier’s check or certified check drawn on a bank or credit union, or a bidder’s bond with a corporate surety.⁵

The bid security is there for one purpose: to guarantee that the winning bidder will actually sign the contract and provide a performance bond. That performance bond, due after award, must equal 100 percent of the contract amount.⁵ Surety premiums for performance and payment bonds on public work typically run between 0.5 and 4 percent of the contract value, with most in the 2.5 to 3.5 percent range, and larger projects often use a sliding scale where the rate drops as the contract grows. The bond is non-negotiable, so contractors need to build the premium into the bid.

Opening the Bids and Awarding the Contract

At the time and place stated in the notice, the governmental entity opens all bids, announces the amounts, and files every proposal received.² Reading the amounts aloud in public is what keeps the process honest.

The contract must go to the lowest responsive, responsible bidder. “Responsive” means the bid met the specifications; “responsible” means the bidder can actually perform. The entity can ask the lowest responsive bidder about experience, workforce, and financial capacity, but it cannot demand confidential or proprietary information as a precondition for being considered responsive and responsible.⁶

Chapter 26 also allows enhancement payments for early completion, but with strings attached. The availability of enhancement payments has to be disclosed in the notice to bidders, the payments must be competitively neutral, they have to be considered as a separate item at the public hearing, and their total value cannot exceed 10 percent of the contract.⁶

Retainage on Progress Payments

Iowa caps retainage lower than many states. Under Iowa Code Section 573.12, the governmental entity may retain no more than 3 percent of each monthly progress payment as determined by the project architect or engineer. General contractors, in turn, may retain from each subcontractor payment no more than the lesser of 3 percent or whatever amount the subcontract specifies.⁷ Retainage in other states commonly runs 5 to 10 percent, so contractors new to Iowa should plan cash flow around the lower cap.

Prevailing Wage and Federally Funded Projects

Iowa has no state prevailing wage law.⁸ On purely state or locally funded projects, wage floors come from ordinary minimum wage and overtime rules.

Federal money changes that. When a public improvement receives federal financial assistance, the Davis-Bacon Act applies to construction contracts over $2,000, and contractors and subcontractors must pay laborers and mechanics at least the locally prevailing wage and fringe benefit rates for similar work in the area.⁹ Federal assistance includes grants, loans, loan guarantees, and insurance. Because many Iowa public improvements pick up some federal funding, the lack of a state prevailing wage law does not mean prevailing wages are off the table.

Buy America Content Rules

Federally assisted projects also face domestic content requirements. For projects obligated on or after October 1, 2026, manufactured products permanently incorporated into the work must be manufactured in the United States, and the cost of domestically produced components must exceed 55 percent of the total component cost.¹⁰ The requirements are phased in, so what applies depends on when the federal funding was obligated.

Disadvantaged Business Enterprise Participation

Federal rules set a national aspirational goal of 10 percent DBE participation in DOT-assisted contracts.¹¹ That 10 percent is not a mandate for any individual project. Each recipient sets its own overall goal based on the actual availability of qualified DBEs in its area.

What Happens When the Rules Are Broken

Chapter 26 does not carry its own penalty section. Enforcement comes through contract law: a contract awarded without following the required competitive bidding procedures is vulnerable to being voided, and an aggrieved bidder can challenge the award in Iowa district court.

The heavier consequences for deliberate misconduct come from federal antitrust law. Bid rigging, price fixing, and market allocation on public construction projects are felonies under the Sherman Act. A convicted corporation faces fines up to $100 million, and an individual faces up to $1 million in fines and 10 years in prison, with courts able to raise those fines to twice the gain or loss involved. Victims can pursue civil recovery of up to three times their damages.¹² The DOJ’s Antitrust Division prosecutes construction bid-rigging schemes actively, and convicted contractors typically face debarment from future public work on top of the criminal penalties.

1
Iowa Legislature. Iowa Code 26.3 – Competitive Bids for Public Improvement Contracts
2
Iowa Legislature. Iowa Code Chapter 26 – Iowa Construction Bidding Procedures Act
3
Iowa Legislature. Iowa Code 314.1B – Adjustments
4
Iowa Legislature. Iowa Code 26.12 – When Hearing Necessary
5
Iowa Legislature. Iowa Code 26.8 – Bid Security
6
Iowa Legislature. Iowa Code 26.9 – Award of Contract
7
Iowa Legislature. Iowa Code 573.12 – Payments and Retention from Payments on Contracts
8
U.S. Department of Labor. Dollar Threshold Amount for Contract Coverage
9
U.S. Department of Labor. Davis-Bacon and Related Acts
10
Federal Register. Buy America Requirements for Manufactured Products
11
eCFR. Part 26 – Participation by Disadvantaged Business Enterprises in Department of Transportation Financial Assistance Programs
12
U.S. Department of Justice. Price Fixing, Bid Rigging, and Market Allocation Schemes