1. No person shall practice as a professional engineer in Missouri, as defined in section 327.181 unless and until there is issued to such person a professional license or a certificate of authority certifying that such person has been duly licensed as a professional engineer or authorized to practice engineering in Missouri, and unless such license or certificate has been renewed as provided in section 327.261.

2. Notwithstanding the provisions of subsection 1 of this section, the following persons may engage in actions defined as the practice of professional engineering in section 327.181, provided that such persons shall not use the title “professional engineer” or “consulting engineer” or the word “engineer” alone or preceded by any word indicating or implying that such person is or holds himself or herself out to be a professional engineer, or use any word or words, letters, figures, degrees, titles, or other description indicating or implying that such person is a professional engineer or is willing or able to practice engineering:

(1) Any person who is an employee of a person holding a currently valid license as a professional engineer or who is an employee of a person holding a currently valid certificate of authority pursuant to this chapter, and who performs professional engineering work under the direction and continuing supervision of and is checked by one holding a currently valid license as a professional engineer pursuant to this chapter;

(2) Any person who is a regular full-time employee of a person or any former employee under contract to a person, who performs professional engineering work for such employer if and only if all such work and service so performed is done solely in connection with a facility owned or wholly operated by the employer and occupied or maintained by the employer of the employee performing such work or service, and does not affect the health, safety, and welfare of the public;

(3) Any person engaged in engineering who is a full-time, regular employee of a person engaged in manufacturing operations and which engineering so performed by such person relates to the manufacture, sale or installation of the products of such person, and does not affect the health, safety, and welfare of the public;

(4) Any holder of a currently valid license or certificate of authority as an architect, professional land surveyor, or professional landscape architect who performs only such engineering as incidental practice and necessary to the completion of professional services lawfully being performed by such architect, professional land surveyor, or professional landscape architect;

(5) Any person who renders engineering services in connection with the construction, remodeling, or repairing of any privately owned building described as follows, and who indicates on any drawings, specifications, estimates, reports, or other documents furnished in connection with such services that the person is not a licensed professional engineer:

(a) A dwelling house;

(b) A multiple family dwelling house, flat, or apartment containing no more than two families; or

(c) Any one building or structure, except for those buildings or structures referenced in subdivision (8) of this subsection, which provides for the employment, assembly, housing, sleeping, or eating of not more than nine persons, contains less than two thousand square feet, and is not part of another building or structure;

(6) Any person who renders engineering services in connection with the remodeling or repairing of any privately owned, multiple family dwelling house, flat, or apartment containing three or four families, provided that the alteration, renovation, or remodeling does not affect architectural or engineering safety features of the building, and who indicates on any drawings, specifications, estimates, reports, or other documents furnished in connection with such services that the person is not a licensed professional engineer;

(7) Any person or corporation who is offering, but not performing or rendering, professional engineering services if the person or corporation is licensed to practice professional engineering in the state or country of residence or principal place of business;

(8) Any person who renders engineering services in connection with the construction, remodeling, or repairing of any building or structure used exclusively for agricultural purposes.