A construction zone traffic control contractor prepares or removes lane closures, flagging, or traffic diversions, utilizing portable devices, such as cones, delineators, barricades, sign stands, flashing beacons, flashing arrow trailers, and changeable message signs, on roadways, including, but not limited to, public streets, highways, or any public conveyance.

A plumbing contractor provides a means for a supply of safe water, ample in volume and of suitable temperature for the purpose intended and the proper disposal of fluid waste from the premises in all structures and fixed works. This classification includes but is not limited to: A. Complete removal of waste from the premises or the construction and connection of on-site waste disposal systems; B. Piping, storage tanks and venting for a safe and adequate supply of gases and liquids for any purpose, including vacuum, compressed air and gases for medical, dental, commercial and industrial uses; C. All gas appliances, flues and gas connections for all systems including suspended space heating units. This does not include forced warm air units; D. Water and gas piping from the property owner's side of the utility meter to the structure or fixed works; E. Installation of any type of equipment to heat water, or fluids, to a temperature suitable for the purposes listed in this section, including the installation of solar equipment for this purpose; and F. The maintenance and replacement of all items described above and all health and safety devices such as, but not limited to, gas earthquake valves, gas control valves, back flow preventers, water conditioning equipment and regulating valves.

The C-61 Limited Specialty License is for contractors who perform specialized work that doesn’t fall under traditional licensing categories. It’s designed for trades that are limited in scope but require proven expertise—such as tree trimming, metal polishing, signage installation, or pre-fabricated equipment setup. This license is commonly used by subcontractors and small business owners offering niche services. Rather than covering a broad field, the C-61 allows professionals to legally operate in very specific areas of construction and maintenance work within California.

A pole installation and maintenance contractor installs wood or precast poles to support the wiring or cable that is installed by others or installs and maintains flag poles.

A non-electrical sign installation contractor fabricates and installs all types of nonelectrical signs, including but not limited to: post or pole supported signs, signs attached to structures, painted wall signs and modifications to existing signs.

A tree service contractor prunes trees, removes trees, limbs or stumps (including grinding) and engages in tree or limb guying.

A construction cleanup contractor cleans up and/or removes from building grounds or structures any debris resultant from any construction project including but not limited to: concrete, dirt, scrap lumber, plaster, drywall, any paint or adhesive products from windows, floors, ceramic tile and bathroom fixtures.