2.3 Contract Administration: Change Orders, Force Account & Project Documents

Reading plans and understanding the specification hierarchy prepares an inspector to interpret the contract as written. Contract administration is what happens when the contract needs to change, when a contractor submittal needs review, or when a material needs to be accepted without testing every single unit — the day-to-day paperwork that keeps a project's official record aligned with what was actually built.

Addenda vs. Change Orders: Before vs. After Award

Two related terms describe contract modifications, and NICET distinguishes them by timing. An addendum is issued by the owner or engineer during the bidding period, before the contract is awarded, to correct, clarify, or modify the original bid documents. Addenda are distributed to every prospective bidder so that all bids are prepared on the same, current information, and once issued they become part of the contract exactly as if they had appeared in the original bid package. A change order, by contrast, can only happen after the contract has been executed and work is already underway; it is a formal, signed modification that adds, deletes, or revises scope, quantity, price, or time on a contract that already exists. The distinction an inspector should keep straight: if a document is correcting the bid package before anyone has signed a contract, it is an addendum; if it is modifying a contract that is already in force, it is a change order — and change-order work should not proceed until the change order, or an authorized interim field directive, has been properly executed.

Force Account: Paying for Work With No Contract Price

Not every item of work has a bid unit price. When the engineer directs work that was not anticipated in the original contract and no fair unit price can be negotiated in advance, the work may be authorized on a force account basis, sometimes called cost-plus or time-and-materials. Under force account, the contractor is paid for the actual, documented cost of labor, equipment, and materials used, plus a specification-defined percentage markup for overhead and profit, rather than a pre-agreed lump sum or unit price. Because there is no unit price to check the work against, force account depends entirely on daily documentation: signed labor and equipment time sheets, material delivery tickets, and a daily force-account report that both the contractor's representative and the inspector sign before the crew leaves the site each day. Missing or unsigned daily force-account documentation is one of the most common sources of payment disputes on a highway project, because there is no other record available to reconstruct the true cost after the fact.

Shop Drawings and Submittals

Certain items — precast structures, structural steel connections, prestressed beams, signal and lighting foundations — require the contractor to submit shop drawings: detailed fabrication or erection drawings prepared by the contractor or a supplier, showing exactly how that contractor intends to build the item within the geometry and performance requirements the design plans establish. The engineer reviews shop drawings and returns them marked approved, approved as noted, revise and resubmit, or rejected. This review is for general conformance with the design concept only. Approval of a shop drawing does not revise the contract, and it does not relieve the contractor of responsibility for dimensions confirmed in the field, for coordinating the work with other trades, or for the means and methods used to build it — unless the engineer's markup explicitly authorizes a specific deviation in writing. An inspector should never treat a stamped shop drawing as license to accept work that contradicts the contract plans or specifications on a point the shop drawing did not explicitly address.

Certificate of Compliance and Materials Acceptance

Many manufactured or catalog materials — guardrail hardware, pipe, geotextile fabric, prefabricated drainage structures — are accepted using a Certificate of Compliance: a written statement from the manufacturer or supplier certifying that the specific lot of material meets the applicable specification, sometimes accompanied by mill or batch test data. A Certificate of Compliance is a legitimate and commonly used basis for materials acceptance, and it substantially reduces the number of items that must be sampled and tested on a given project. However, a Certificate of Compliance supports acceptance; it does not replace verification or acceptance testing the specification specifically requires. Where the specification calls for independent sampling — concrete cylinder breaks, HMA density cores, or aggregate gradation, for example — the agency retains the right, and often the obligation, to sample and test regardless of what a certificate states, and a Certificate of Compliance never overrides a failing field or laboratory test result.

The Job Mix Formula and Contract Administration

Asphalt mixtures are governed by a similar submittal-and-verification logic through the Job Mix Formula (JMF). Before production begins, the contractor submits a JMF establishing the single target aggregate gradation, asphalt binder content and type, and mixing temperature range for that specific mix, and the engineer approves it against the specification's mix-design requirements. Once approved, the JMF becomes the standard an inspector checks daily production against — not the broader specification range on its own — and a shift outside the JMF's stated tolerance is a nonconformance the inspector documents and reports, even if the material would still fall within the general specification limits.

Project Documents Tie It Together

Change orders, force-account reports, shop drawing submittal logs, certificates of compliance, and the approved JMF are all project documents an inspector helps generate or maintain. Together with the daily inspection report, they form the official record the agency relies on to resolve disputes, process progress payments, and certify final acceptance. An inspector's contract-administration responsibility is less about interpreting legal language and more about generating an accurate, contemporaneous paper trail — the contract document that governs a dispute is only useful if daily records prove what was actually built.

Change Instruments at a Glance