What Is a Special Inspector?
A special inspector is an independent inspector required by building code for critical construction elements — structural steel, concrete, masonry, deep foundations, and certain MEP systems. They're separate from the city's building inspector and are hired by the owner.
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When special inspection is required
IBC Chapter 17 mandates special inspection for structural steel connections, concrete placement and reinforcement, masonry construction, driven piles and drilled piers, spray-applied fireproofing, and EIFS. The building official can require additional inspection for unusual conditions. Most commercial projects trigger at least some special inspection.
Who hires and pays
The owner hires the special inspector (not the contractor — this ensures independence). The inspector must be approved by the building official and qualified for the specific inspection type. Costs typically run $5,000-$25,000 depending on project size and inspection scope.
What they actually do
Special inspectors verify that critical work matches the approved drawings and specifications. They observe rebar placement before concrete pours, witness bolt tensioning on steel connections, verify weld quality, and document everything. Their reports go to the building official and become part of the permit record. Work cannot be covered until the special inspector signs off.
The bottom line
Special inspectors are code-required independent verifiers for critical structural work. The owner hires them, and work can't be covered until they sign off.
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