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Profession Playbook

Interior Designer

Licensed profession, reserved title

In Ontario the title "Interior Designer" is legally reserved — only Registered members of ARIDO may use it. Becoming one means an accredited degree, thousands of supervised hours, and the NCIDQ exam.

Interior Designer at a glance

Credential
Reserved title — only ARIDO Registered members may use "Interior Designer" in Ontario
Path in
Bachelor of Interior Design → 3,520 supervised hours → NCIDQ (or RIDA)
Regulated by
Association of Registered Interior Designers of Ontario (ARIDO)
Insurance baseline
Professional liability (E&O) for a design practice
Professional body
Association of Registered Interior Designers of Ontario (ARIDO)

Where are you right now?

Qualify. Practise. Own it. Pick the door that matches where you are.

Getting inBecome an interior designerThe real path: degree, supervised experience, and the licensing or designation exam.Open Going out on your ownStart an interior design practiceFrom qualified professional to your own authorized, insured practice.Open Just lookingCommon questionsCredentials, timelines, and how-to questions, answered straight.Open

The credential, explained

Interior design is a title-protected profession in Ontario: under the Interior Design Act, only ARIDO Registered members can call themselves an "Interior Designer". Registration requires a four-year accredited interior design degree, a minimum of 3,520 hours of supervised work experience, and the examination requirement — the NCIDQ exams or (as of March 2025) ARIDO's Examination Alternative (RIDA). Anyone can do decorating, but the professional title is reserved.

Designations in this profession

  • InternARIDO Intern member (during supervised experience)
  • ARIDOARIDO Registered Interior Designer: Reserved title under the Interior Design Act

Insurance to expect

A design practice carries professional liability (E&O) for its specifications and drawings — particularly where work touches life-safety elements like egress, fire separations, and accessibility. E&O is the core coverage.

Go to the source

The official bodies that govern this profession. Bookmark these, they are the final word on requirements, exams, and fees.

Keep reading

IncorporationCRA RegistrationInsuranceOperational Setup

Ready to start an interior design practice?

AEC Stack handles the business side (incorporation, registrations, insurance, and operations) so you can focus on the professional work.

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