There Is No Single Workmanship Code
People often ask which code a contractor violated. The honest answer is that workmanship is judged against a set of requirements that vary from project to project. A kitchen remodel in a single-family home and a tenant build-out in an office tower are governed by different contracts, different specifications and sometimes different codes. The first job of a workmanship expert is to identify which requirements actually applied, at the time the work was performed, to the specific item in dispute.
Contract Documents and Specifications
The contract is usually the most specific standard. It defines the scope, the products, the level of finish and sometimes the tolerances. Specifications may adopt industry references by name. Change orders, approved submittals and RFI responses can modify the original requirements, so Paul reviews them in date order to understand what the requirement was when the work was installed. This is covered in more detail on the document review page.
Adopted Building Codes
Building codes set minimum requirements for safety and performance. Most jurisdictions adopt a model code, often with local amendments. The City of Chicago, for example, adopted the Chicago Construction Codes, including the Chicago Building Code (Title 14B of the Municipal Code), which became mandatory for permit applications on August 1, 2020. Before referring to a code, Paul identifies the edition and local amendments in effect for the project's permit, because a later edition may not apply.
Code compliance is a minimum. A condition can meet code and still fail to meet the contract, and a code issue is not automatically a workmanship issue if the work was built as designed. Paul's opinions on code compliance are limited to installed conditions within his experience as a contractor and carpenter.
Manufacturer Installation Instructions
Manufacturers publish installation instructions for products such as flooring, doors, windows, drywall, adhesives and finishes. Those instructions often control fastener spacing, substrate preparation, acclimation, expansion gaps and environmental conditions. Many codes and specifications require installation in accordance with them, and product warranties frequently depend on it. Paul obtains the instructions that applied to the product and date of installation, not the current version, wherever the record allows.
Trade Practice and Published Guidelines
Where the documents are silent, recognized trade practice fills the gap: the way a competent tradesperson performs the work in that market at that time. Published references, such as residential construction performance guidelines and trade association installation standards, help describe that practice. Paul uses them as references, not as rules that override the contract, and he identifies the edition used.
For how these standards are applied to field conditions, see construction workmanship analysis.