Exhibit 99.9



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|Stantec Inc. Code of Ethics Policy |  | LOGO

May 11, 2016

Policy

Stantec conducts business in accordance with high ethical, moral and legal standards, efficiently, in good faith, with due care, and in the best interests of the
Company, its employees, shareholders, and other stakeholders. Stantec maintains business practice standards that will earn the respect of everyone with whom the Company conducts business.

Practice

The following standards are intended to protect the
Companys reputation and the quality of its services, as well as to serve the best interests of its clients, employees, shareholders and other stakeholders.

Application

The Stantec Code of Ethics applies to all employees and is
not intended to be exhaustive. Employees are expected to conduct themselves in the performance of their duties with high ethical, moral, and legal standards.

Dealing with Each Other

Stantec understands that effective
relationships are based on the recognition of the value and worth of each individual and that it is necessary to provide a working climate that is conducive to the success and well-being of all employees. Stantec works to create an atmosphere of
mutual trust and respect by being honest, fair, and consistent. Stantec treats all employees fairly and impartially and strives to consistently follow Company policies and practices, Stantec employees listen to one another and foster open and honest
communications. Stantec values the opinion of employees, respects their diverse backgrounds, encourages communication among employees, and solicits ideas and suggestions to improve or benefit the Company.

Stantec prohibits the use by its employees of any social or other media to post or display comments about coworkers, supervisors, clients or the Company that (non-exhaustively)



| |  |  | Are vulgar, obscene, threatening, intimidating, harassing
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| |  |  | Portray the Company or individuals in a negative light
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| |  |  | Are a violation of Stantecs Conflict of Interest Policy or other workplace policies against discrimination,
harassment, and violence
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Posting or displaying such comments could result in disciplinary action being taken against an employee.

Dealing with Shareholders

Stantec is committed to protecting and
improving shareholder value through the prudent use of Company resources and by observing high standards of legal and ethical conduct in all its business dealings. The Company communicates with shareholders regularly, candidly, and promptly,
providing the information necessary to evaluate its management and investment value.

Dealing with Clients

Serving clients is the essence of Stantecs business. Meeting our clients expectations and providing good value are the best ways to ensure ongoing demand
for our services. Stantec will accurately represent its services and clearly communicate the terms under which these services are provided.

Dealing with
Subconsultants and Suppliers

Stantec is committed to the fair treatment of subconsultants and suppliers and will select subconsultants and suppliers who
provide the best value for the Company and its clients while also respecting its clients wishes.

Proprietary Information Belonging to the Company

Employees must maintain the confidentiality of the Companys proprietary information. Examples of proprietary information include strategic plans,
client lists, marketing plans, rate tables, and much of the technical information that the Company generates or uses in its business. The disclosure or misuse of Stantecs business information can harm the Companys competitive position
and/or reputation and may be a violation of applicable laws. Employees, therefore, must not disclose business information outside the Company unless they are authorized and legal to do so.

Proprietary Information of Others

Stantec regularly receives
proprietary information from its clients, subconsultants, and suppliers. The wrongful possession or use of any proprietary information of any third party is prohibited. Employees may use lawfully obtained proprietary information only for the purpose
for which it is provided. If an employee is offered, or comes into, unauthorized possession of



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third-party proprietary information, the employee must decline the offer and take appropriate steps, if applicable,
to return the information.

Abiding by the Law

Wherever Stantec
operates, it will at all times comply with applicable laws and regulations. In acting on behalf of Stantec, no employee shall, at any time, take any action which they know or reasonably should know to be in violation of any applicable law or
regulation. Any time an employee is uncertain about the application or interpretation of a law or regulation, they should consult their supervisor who, in case of doubt, should seek the opinion of the Companys Risk Management team.

Improper Payments

No payment will be made by, or improper benefit
conferred on behalf of, the Company either directly or indirectly to government officials, political candidates, or officers or employees of clients, subcontractors, suppliers, or competitors that violates applicable laws, Bribes, facilitation
payments and trading in influence are strictly prohibited. Employees working outside North America should familiarize themselves with Stantecs policy regarding foreign business practices.

Personal Business

Personal business should not be conducted during
normal working hours. Any/all personal business activities should be confined to after hours or lunch breaks and should be consistent with Stantecs Conflict of Interest Policy and Practice, paying particular attention to the Moonlighting
without Permission section.

Reporting Violations of the Stantec Code of Ethics

An employee who becomes aware of a violation of this code, or who believes that a violation may take place in the future, must report the matter. Ordinarily, the
report should be made to the employees immediate supervisor who, in turn, must report it to the Companys general counsel. If the supervisor takes no action or the employee feels that it would be appropriate to report to a person in
higher authority, the employee should bring the matter to the attention of the general counsel. Requests for anonymity will be respected to the extent that this does not result in the violation of the rights of another employee.



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Reporting Violations of the Law

In addition to reporting violations of the Companys Code of Ethics, it is Stantecs policy to protect employees against unlawful discrimination or
retaliation by their employer as a result of lawfully reporting information regarding, or participating in, investigations that involve corporate fraud or other violations of applicable law by the Company or its employees. For further information,
refer to Stantecs Integrity policy.

Compliance Responsibilities

Stantecs Code of Ethics is to be strictly followed at all times and under all circumstances. Any violation will subject an employee to disciplinary action up to
and including termination. To protect its employees, shareholders, and other stakeholders, the Company has designated its general counsel as the individual who is responsible for administering and overseeing the compliance and reporting process of
this code. The general counsel will report submitted, material complaints as he or she determines to be appropriate, or as required under the directives of the Stantec Board of Directors, to the chief executive officer, the chief operating officer,
the chief business officer, the chief human resources officer, the chair of the board, or an appropriate committee of the board.

Stantec and all of its employees
benefit from an atmosphere of good ethical conduct. Employees are encouraged to discuss with their supervisor or regional Human Resources coordinator, or, if they prefer, with the Companys general counsel, any situations of existing or
potential noncompliance involving themselves or others.



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