AEC definitions
VIF means verify in field. The dimension or condition is based on available information, and the contractor must measure the existing work before ordering or building the new piece that depends on it. It shifts the duty to check. It does not make a wrong drawing the contractor's design error if they reported the conflict.
Definition
Renovations use VIF because existing buildings do not match old drawings. A new opening, a piece of casework, or a piece of equipment that has to fit an existing bay is dimensioned as well as the documents allow, then marked VIF. The contractor measures, and if the field differs in a way that affects the work, they stop and issue an RFI before fabricating. A general note that says 'verify all dimensions in field' on a new building is not a substitute for dimensioning the drawings.
In depth
A dimension to an existing wall that nobody has surveyed is a fair VIF. A dimension between two new gridlines is the designer's job. Scattering VIF on new work dumps layout onto the field and produces RFIs the drawings should have answered.
If a whole elevation is unknown, the right step may be a field survey before CD issue, not a sheet of VIF notes.
The contractor measures the condition the note identifies, compares it to the drawing, and proceeds if it matches within the tolerance the spec states. If it does not, the RFI should include the measured value and the affected detail.
Ordering the casework the day the note is read, and discovering the wall is 2 inches out after delivery, is a failure to verify, not a drawing error.
The contract decides. Often the contractor must verify, and a differing existing condition that a reasonable bid could not have seen becomes a change. VIF is not an automatic contractor risk for every hidden condition. Differing site condition clauses still apply to what those clauses cover.
A note cannot silently transfer design responsibility. It can require a measurement.
Field dimensions that the work was built to belong in the record. The next trade and the as-built set need the number that was real, not the number that was marked VIF.
RFIs that resolved a VIF should be cited on the record drawing.
Reviewers should challenge 'contractor to verify all dimensions' on a new structure.
It conflicts with 'do not scale' and with the designer's duty to dimension. Keep VIF on the items that are genuinely existing.
Examples
A door in an existing masonry wall is dimensioned to the nearest existing pier and marked VIF. The contractor measures before ordering the frame and RFIs a 1 inch difference.
New grids are fully dimensioned. They are not marked VIF.
The measured opening is recorded on the as-built plan after the RFI is answered.
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