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National Building Authority serves as a public reference directory for the construction services sector across the United States. This page covers the scope of inquiries the directory supports, what information to include when submitting a message, realistic response timelines, and supplementary contact options for specific professional or regulatory needs. Requests related to contractor listings, permitting questions, and directory classification fall within the scope this reference handles.

Service area covered

National Building Authority maintains directory coverage across all 50 states, with listings and reference content organized by construction service category, license classification, and geographic jurisdiction. The directory addresses the following professional and regulatory domains:

Construction service categories covered:

1. General contracting — commercial, residential, and industrial
2. Specialty trades — electrical, plumbing, mechanical (HVAC), roofing, and structural
3. Building inspection services — including third-party inspection firms and licensed inspectors operating under International Code Council (ICC) certification frameworks
4. Permitting consultants and plan review professionals
5. Code compliance services — referencing model codes including the International Building Code (IBC), International Residential Code (IRC), and National Electrical Code (NFPA 70)
6. Design professionals — licensed architects and engineers involved in permit-required construction

Geographic scope: Inquiries are accepted for any of the 50 states. State-specific licensing authority names, such as the California Contractors State License Board (CSLB) or the Texas Department of Licensing and Regulation (TDLR), may be referenced in directory listings and content. The directory does not administer licensing and does not represent any state regulatory body.

Out-of-scope topics: Federal workplace safety enforcement under OSHA 29 CFR 1926 (Construction), active code violations, legal disputes between contractors and clients, and insurance claims are outside the scope of directory inquiries. Those matters belong with the relevant state contractor licensing board, local authority having jurisdiction (AHJ), or legal counsel.

What to include in your message

Incomplete inquiries delay responses. Submissions with full context receive faster routing and more useful replies.

For listing-related inquiries (additions, corrections, removals):

• Business or individual name as it appears or should appear in the directory
• State of licensure and license number, as issued by the relevant state licensing board
• Construction trade or specialty (e.g., licensed general contractor, ICC-certified building inspector, NFPA-compliant fire protection contractor)
• The specific listing page or URL in question, if a correction is being requested
• A description of the inaccuracy or the nature of the requested update

For content or regulatory reference inquiries:

• The specific building code, standard, or regulatory body in question — for example, a reference to IBC Chapter 16 (Structural Design) or ASHRAE Standard 62.1 (Ventilation for Acceptable Indoor Air Quality)
• The state or jurisdiction the question pertains to
• Whether the inquiry involves new construction, renovation, change of occupancy, or demolition — these carry distinct permitting and inspection thresholds under most adopted code frameworks

For research or data inquiries:

• The construction vertical, trade category, or geographic scope of interest
• Whether the request is for directory listings, regulatory reference data, or both
• Institutional affiliation, where applicable (academic institution, government agency, trade association)

A minimum of 3 identifying details per inquiry — such as state, trade type, and specific issue — reduces back-and-forth and accelerates resolution.

Response expectations

Directory inquiries are handled in order of submission. Turnaround varies by inquiry type:

• Listing correction or addition requests: Review within 5 to 7 business days. Complex corrections that require license verification against a state database — such as cross-referencing a contractor's status with the Florida Department of Business and Professional Regulation (DBPR) or the New York Department of State Division of Licensing Services — may require additional time.
• General reference and content questions: Responses within 3 to 5 business days.
• Data and research requests: Scoped individually. Requests requiring compilation across multiple states or trade categories may take 10 or more business days.

Submissions that involve active construction permit disputes, enforcement actions, or complaints against licensed contractors will not receive substantive responses through this channel. Those matters belong with the AHJ for the project jurisdiction or the relevant state licensing board. For example, complaints against licensed contractors in Texas are processed through TDLR's formal complaint portal; in California, through the CSLB's enforcement division.

Additional contact options

The directory's reference content is organized across several structured areas that address specific professional use cases. Before submitting a contact inquiry, the following resources may resolve the question directly:

• Building Listings — The primary index of contractor and construction service listings, organized by trade category and state. Listing status, classification, and license information are displayed within individual entries.
• Building Directory Purpose and Scope — Defines the classification boundaries used in the directory, including how general contracting is distinguished from specialty trade work, and how inspection services are categorized separately from contractor listings.
• How to Use This Building Resource — Covers navigation, search filters, and the criteria applied when listing construction professionals under specific trade and licensure categories.

For state-specific regulatory questions that fall outside directory scope, the authoritative sources are the relevant state contractor licensing board, the state-level AHJ, or the model code organization — the International Code Council (ICC) publishes code adoption maps and jurisdiction-specific adoption status for all 50 states at iccsafe.org. NFPA publishes the adoption status of NFPA 70 (National Electrical Code) by state through nfpa.org.