Most Regulated Contractor Trades

Contractor trades ranked by the number of U.S. states (including DC) that require a license to work, across all 51 jurisdictions and 20 trade categories tracked from state licensing boards and NASCLA. Trades requiring licenses in 45+ states are effectively universally regulated. See our methodology.

Universally Required Licenses

45+ states
# Trade States Requiring License
1 Electrician
Installs and maintains electrical wiring, equipment, and fixtures
 51 of 51
2 Pest Control
Eliminates and prevents infestations of insects, rodents, and other pests using chemicals
 51 of 51
3 Plumber
Installs and repairs water, gas, and drainage systems
 47 of 51

Widely Required Licenses

30–44 states
# Trade States Requiring License
4 HVAC Technician 40 of 51
5 Carpenter 36 of 51
6 Demolition 36 of 51
7 Elevator Mechanic 36 of 51
8 Excavation 36 of 51
9 Flooring Installer 36 of 51
10 General Contractor 36 of 51
11 Glazier 36 of 51
12 Insulation Installer 36 of 51
13 Landscaper 36 of 51
14 Mason 36 of 51
15 Painter 36 of 51
16 Tile Setter 36 of 51
17 Fire Protection 32 of 51

Partially Required Licenses

Under 30 states
# Trade States Requiring License
18 Roofer 28 of 51
19 Pool Contractor 25 of 51
20 Solar Installer 25 of 51

Source: State contractor licensing board regulations and published licensing requirements State contractor licensing board regulations and published licensing requirements "51 states" includes Washington D.C. Requirements change — always verify with the relevant state licensing board before working