Per (225 ILCS 320/37) (from Ch. 111, par. 1135) of The Illinois Plumbing License Law
"A letter of intent shall be included with all plumbing permit applications. The letter shall be written on the licensed plumber of record’s business stationery and shall include the license holder’s signature and, if the license holder is incorporated, the license holder’s corporate seal. If the license holder is not incorporated, the letter must be notarized."
Renovation, Repair & Painting
In April 2010, U.S. Environmental Protection Agency’s (USEPA) new rule, the Renovation, Repair and Painting (RRP) rule, requires contractors performing renovation, repair and painting projects that disturb lead-based paint in homes, child care facilities, and schools built before 1978 to be certified by the USEPA and to follow specific work practices to prevent lead contamination.