Staircase Engineering in North Carolina — Comprehensive Inspection and Appendix G

A North Carolina homeowner reached out to us with a post-construction problem that is more common than you would guess: the staircase in a recently renovated home did not obviously match the approved drawings, and the county inspector left a correction notice tied to a broader Appendix G submittal. The owner needed an engineer to verify conformance, document it formally, and issue the Appendix G form for the file.

The scope of work

The investigation covered the full stair run:

• Rise and run geometry. Under the NC Residential Code, maximum riser height is 7¾” and minimum tread depth is 10”. Variation between the largest and smallest riser (and between the largest and smallest tread) cannot exceed 3/8” within a flight.
• Headroom. Minimum 6’-8” measured vertically from the tread nosing line.
• Handrails. Continuous handrail at a height of 34”–38” above the tread nosing, with a graspable profile per NCRC R311.7.8.
• Guards. Minimum 36” above the walking surface on open sides where the drop is greater than 30”, with opening limitations that resist a 4-inch sphere.
• Structural. The stringers, treads, and connections were field-verified against the approved framing plan; any deviations were reconciled with documented capacity.

What Appendix G captured

Appendix G provides the administrative record: the engineer’s name and license number, the specific code edition, the investigation date, the sealed finding, and a photographic log referenced back to the narrative. The form is the deliverable the inspector files; the narrative is what we archive for our records and make available if the finding is ever questioned.

The outcome

The staircase met code with two minor deviations on a single riser that were within tolerance after the rounding convention applied by the code commentary. We documented the finding, sealed the letter and Appendix G form, and the correction notice cleared within the same inspection cycle.

Staircase letters are one of the higher-frequency structural letters we write. If you are mid-renovation or mid-sale and a stair geometry or guard-rail question is blocking the permit, reach out. Most of these close in 24–48 hours.