Construction Listings

The construction listings on this directory cover installation contractors, specialty trades, and related service providers operating across the United States. Entries are organized by trade category, geographic market, and licensing classification. The listings function as a reference index for service seekers, procurement professionals, and researchers navigating the US construction installation sector — not as a ranked or endorsed provider list.

Geographic distribution

Construction installation services in the United States are regulated at the state and local level, producing a highly fragmented licensing landscape. Contractor licensing requirements differ across all 50 states, with states such as California (Contractors State License Board, CSLB), Florida (Department of Business and Professional Regulation, DBPR), and Texas (Texas Department of Licensing and Regulation, TDLR) maintaining distinct examination, bonding, and insurance thresholds.

This directory spans the national scope, with entries clustered in high-density construction markets including the Northeast corridor, the Sun Belt, and the Pacific Coast. Metro statistical areas with the highest volume of listed contractors include Los Angeles, New York City, Houston, Phoenix, and Chicago — reflecting Bureau of Labor Statistics data on construction employment concentration.

Entries are grouped by state, then by county or metro area, allowing searchers to filter the Installation Listings index by jurisdiction. Rural and low-density markets are represented where licensed contractors have submitted qualifying information, but coverage is denser in urban and suburban markets by default.

How to read an entry

Each listing entry is structured around a fixed data schema. The fields present in a standard entry are:

1. Business name — The legal or trade name of the contracting entity as registered with the relevant state licensing board.
2. License number and issuing authority — The state-issued contractor license number and the name of the issuing regulatory body (e.g., CSLB License #, Florida CGC number).
3. Trade classification — The specific installation specialty covered by the license, such as General Building, Electrical (C-10 in California's classification system), Plumbing, HVAC, Roofing, or Glazing/Windows.
4. Geographic service area — The counties, metro areas, or states in which the contractor is authorized to operate under the listed license.
5. Bonding and insurance status — Whether the contractor carries general liability insurance and a contractor's surety bond, as required by most state licensing statutes.
6. Verification date — The calendar quarter in which the listing data was last cross-referenced against the issuing state board's public license lookup database.

The Directory Purpose and Scope page provides additional context on how these fields are defined and maintained across the broader reference network.

What listings include and exclude

Listings include:

• Licensed general contractors holding Class A, Class B, or specialty (Class C) licenses as defined by state statute
• Specialty installation contractors in trade categories governed by named codes: the National Electrical Code (NEC, NFPA 70), the International Plumbing Code (IPC), the International Mechanical Code (IMC), and the International Building Code (IBC)
• Contractors whose primary business activity falls within the North American Industry Classification System (NAICS) subsector 238 — Specialty Trade Contractors
• Entities operating in commercial, residential, or mixed-use installation contexts

Listings exclude:

• Unlicensed handyman operators or exempt minor-work providers operating below statutory threshold project values (thresholds vary by state; California sets this at $500 for combined labor and materials)
• General engineering contractors whose scope does not include building installation work
• Manufacturers, distributors, and suppliers who do not perform installation services
• Design professionals (architects, engineers) not also holding a contractor's license
• Contractors with lapsed, suspended, or revoked licenses at the time of the verification check

The distinction between a General Building contractor and a Specialty contractor is operationally significant: a General Building contractor can coordinate and subcontract across trades on a single project, while a Specialty contractor is authorized to perform only the specific trade classification listed on the license. This boundary is enforced by state licensing boards and affects project bidding eligibility under public procurement rules.

For context on how to navigate these distinctions within the directory interface, see How to Use This Installation Resource.

Verification status

Listings in this directory are assigned one of three verification status designations:

• Verified — License number has been confirmed against the issuing state board's public database within the preceding 12-month period. Bond and insurance attestations are on file.
• Pending Review — Listing data has been submitted but cross-referencing against the state board database has not yet been completed for the current verification cycle.
• Unverified — Listing is present in the index based on self-submitted data only. No independent confirmation against a state licensing authority has been performed.

Verification is a data accuracy function, not an endorsement. A "Verified" designation confirms that a license number matches a record in the state board's public system at the time of the check — it does not confirm insurance coverage amounts, claim history, financial standing, or workmanship quality. State licensing board public lookups, including the CSLB license check portal and the Florida DBPR licensee search, remain the authoritative sources for real-time license status.

Permitting status is not tracked at the listing level. Permit issuance and inspection records are maintained by local Authority Having Jurisdiction (AHJ) offices — typically municipal or county building departments — and are not centralized in any national database accessible to this directory. Contractors listed here are expected to pull required permits under applicable codes, including those adopted from the International Code Council (ICC) family of model codes, but permit compliance verification falls outside the scope of this index.

References

• 28 CFR Part 35 — Nondiscrimination on the Basis of Disability in State and Local Government Services
• North American Industry Classification System (NAICS) under code 238990
• Advisory Council on Historic Preservation — Section 106 of the National Historic Preservation Act
• ADA Standards for Accessible Design — U.S. Department of Justice
• 2010 ADA Standards for Accessible Design — U.S. Department of Justice
• California Contractors State License Board — License Classifications
• Center for Universal Design, NC State University — 7 Principles of Universal Design
• US Bureau of Labor Statistics