Three states and D.C. license the practice of interior design. License requirements are highly uniform: All three states and D.C. require six years (2,190 days) of education or experience, between $1,120 and $1,485 in fees, and one exam. These requirements are the most burdensome of all 102 occupations studied here. However, because so few states license the practice of interior design, the occupation ranks as only the 87th most widely and onerously licensed.

All 50 states and D.C. require water well earth drillers to obtain licenses. On average, these laws require $356 in fees, over two years (837 days) of education and experience, and about two exams—the 13th most burdensome requirements of the 102 occupations studied here. And because water well earth drillers are also licensed everywhere, the occupation is the third most widely and onerously licensed.

License requirements vary widely across states. While 41 states require education or experience, the time required ranges from one to over six years. The number of required exams also varies widely, from zero in four states to five in Utah. Fees follow a similar pattern: Arizona and Nevada require over $1,000, but Illinois, Michigan and Nebraska require $50 or less.

Thirty-nine states require a license to work as a fire alarm installer. On average, these laws require $557 in fees, about two and a half years (915 days) of education and experience, and around two exams—the 10th most burdensome requirements of the 102 occupations studied here. The occupation is the 18th most widely and onerously licensed.

License requirements vary widely across states. For example, Connecticut and Tennessee each require six years (2,190 days) of education or experience, but five states require no education or experience. Similarly, five states require four exams, but two require none. Fees also vary, from $0 in Kansas to $1,665 in Louisiana.

Forty-four states require a license for family child care homes. On average, these licenses require $79 in fees and 48 days of education and experience, making family child care home the 70th most burdensome occupation of the 102 studied. However, because most states license the occupation, it ranks as the 25th most widely and onerously licensed.

License requirements vary widely across states. North Carolina requires operators of child family care homes to dedicate about 401 days to education and experience (one year of child care experience, 36 hours of training and a four-credit-hour class). However, 21 states require fewer than 10 days of education or experience, and another nine require none at all. Similarly, fees range from $0 in Vermont to $300 in D.C.

Rhode Island is the only state to license conveyor operators. The state mandates that candidates for licensure pay $117 in fees, pass an exam related to the trade and be at least 18 years of age. These burdens are the 81st most onerous of the 102 occupations studied here. Because only one state licenses the occupation, it ranks as the 100th most widely and onerously licensed.

Ten states require a license to work as a farm labor contractor. On average, these laws cost farm labor contractors $173 in fees. Three states require exams, while every state requires a fee. These relatively low barriers give the farm labor contractor occupation the 95th most burdensome requirements of the 102 occupations studied here. The occupation is the 79th most widely and onerously licensed.

Thirty states license cement finishing contractors working on residential properties. On average, states require 307 days of education and experience, $300 in fees, and about one exam. All in all, 15 states require at least one exam (California requires three). These requirements rank as the 51st most burdensome.

Thirty states license drywall installation contractors working on residential properties. On average, states require over a year (368 days) of education and experience, $313 in fees, and about one exam. All in all, 16 states require at least one exam (California requires three). These requirements rank as the 42nd most burdensome.

Forty-three states require commercial fishers to have a license. A fee is generally the only requirement for a license, except for in a handful of states that set a minimum age. Fees vary quite a bit, from $2 in Wisconsin to $500 in Montana and Nevada. In several states, license fees vary according to the type of fish being caught, the type of water being fished on (saltwater versus freshwater), the type of vessel being used, or the number and type of fishing tools being used (nets, traps, etc.). In such cases, when possible, the least restrictive options were observed. The average fee is $142, giving the occupation the 97th most burdensome requirements of the 102 occupations studied here. However, because it is widely licensed, commercial fisher is the 30th most widely and onerously licensed occupation.

Twenty-five states license insulation contractors working on commercial properties. Ten states require between two and five years of experience working under a licensed contractor. Alabama and Mississippi require completion of three contracted jobs. Thirteen states require no experience. On average, states require 458 days of education and experience, $366 in fees ($1,033 in Nevada), and around one exam. These high barriers give commercial insulation contractors the 35th most burdensome requirements of the 102 occupations studied.