Contractor Encyclopedia
The reference library for commercial contractors
CSI divisions, NAICS & SIC codes, state license boards, federal procurement, local permits, prevailing wage, insurance & bonding — everything you need to register, bid, and win commercial and public work. Free. No signup required.
MasterFormat
CSI Codes — All 24 Divisions
The complete CSI MasterFormat reference for commercial construction bidding. Every division, every key trade, plus a free branded PDF download.
Open referenceNAICS 23
NAICS Construction Codes
Every NAICS code in construction (236, 237, 238) with SBA small-business size standards. Required for SAM.gov, GSA, and state vendor registration.
Open referenceLegacy SIC
SIC Codes — Major Groups 15, 16, 17
Every legacy SIC code in construction with NAICS crosswalk. Still required by D&B, banks, insurers, and many state portals.
Open reference50 States + DC
State Contractor License Boards
Every state licensing authority — board name, official URL, license threshold, and bond requirement for all 50 states and DC.
Open referencePSC + SAM.gov
Federal Procurement Walkthrough
Every construction PSC code (Y & Z), step-by-step SAM.gov registration, set-asides, and FAR Part 36 basics for federal contractors.
Open referenceTop 25 Metros
Local Permits by Metro
Building department, permit portal, and contractor registration entry point for the 25 largest US metros — bookmark-quality reference.
Open referenceDavis-Bacon
Prevailing Wage Basics
Davis-Bacon Act, wage determinations, certified payroll (WH-347), and state 'little Davis-Bacon' laws — explained in plain English.
Open referenceRisk Transfer
Insurance & Bonding Glossary
CGL, EMR, Builders Risk, OCIP, Miller Act, performance/payment bonds, SBA bonding — every term contractors need to read a contract.
Open referenceProcurement Checklist
10 Documents for Government Contracts
The exact prep checklist contractors need to bid federal, state, and municipal work.
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