This is the part that does not fit in a brochure. It is also the part that decides whether the module ships legal.
There Is No National Approval
Each state runs its own industrialized or modular program. A module accepted in one state is not automatically legal in the next. Reciprocity is real in some programs and absent in others. It gets checked. It is not assumed.
The Agency Has to Be Theirs
Design review and in-plant inspection have to be done by an agency that state accepts. A capable third party that is not on that list does not get the module approved. We start by confirming the agency, not by submitting and hoping.
Their Code, Not the Last Job
The adopted code is that state’s code, including amendments. Wind, snow, seismic, energy, and accessibility change the LOD 300 package. The last project’s code edition is not a template.
Review Closes Before the Bay Opens
Plan review comes back in rounds. Comments, responses, then approval. Production starts on the released package. Building through open comments is how finished modules get cut open.
Closed Construction Does Not Unsee Itself
Once a wall or a skid is closed, the inspector cannot accept what they did not see. Miss the hold point and the repair is to open it. The QMS puts the inspector there first.
The Local Official Does Not Re-Review the Factory
The state program covers the factory-built scope. The local official covers the site: foundation, set, and connections. Shops that blur that line turn installation day into a second plan review.
No Label, No Legal Shipment
The insignia is not a decal for the photo. It is issued against the approved design. A module without the right label does not ship into that state, no matter how finished it looks.
A Shop Change Is a Revision
After approval, a change goes back through engineering, quality, and the program. It is not a field fix that the state hears about when the module is already on the truck.
UL Does Not Replace the State
A UL program is the listing path when the product needs one. It is not a substitute for the state modular program, and the state program is not a listing. Projects that need both get both. Projects that need one are not dragged through the other.