What Is the CF1R for a House?
The CF1R is the Certificate of Compliance — the document showing the design meets the Energy Code. On a house, which variant of it applies depends on whether the work is new construction, an addition or an alteration.
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One name, several forms
People talk about "the CF1R" as a single document, but it is a family. New construction and additions use the main compliance forms. Alterations use the ALT series, and which one depends on the scope: there is a form for prescriptive alterations generally, and a separate one for altered space-conditioning systems, which is the form that carries the HVAC and duct requirements.
This matters because a homeowner asked for "the CF1R" on a furnace changeout is being asked for something quite different from the CF1R on a new house, and the two take different amounts of work to produce.
What it records
The geometry and conditioned floor area, the envelope assemblies and their insulation, the glazing schedule with performance values and orientation, and the heating, cooling, ventilation and water-heating equipment. It then demonstrates compliance, either against the prescriptive requirements or by modelling the design against a reference building.
It is produced in software the Energy Commission has approved for the current code cycle, and the documentation author signs it. Where the design relies on measures needing field verification, the form is registered with a HERS provider's data registry rather than simply printed, and it carries a registration number.
Why it comes back at plan check
Nearly always because the certificate and the drawings have stopped describing the same building — a window resized, an equipment model changed, an assembly revised after issue. Reissuing it against the current drawings resolves it, and two revisions are included so that is a normal part of the job rather than a new one.