Going out on your own
How to start an interior design practice in Ontario
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)
You must be licensed first. A practice can only offer interior designer services to the public once it holds the regulator’s firm authorization, which requires a licensed principal and professional liability insurance. Sort the firm authorization before you take work.
The steps to start your practice
- 1
Set up your design practice
There is no separate firm licence — but to present your firm as offering interior design you need ARIDO-registered designers and professional liability (E&O) insurance. Incorporate, set up your accounts, and carry E&O before you take on clients.
Full guide: Insurance - 2
Incorporate (or form a professional corporation)
Most professionals incorporate to limit liability and for tax efficiency. Several regulated professions (architects, engineers) can form a professional corporation with a Certificate of Authorization — confirm the right entity type with your regulator before filing.
Full guide: Incorporation - 3
Set up your CRA accounts
Register for a Business Number, HST/GST (mandatory above $30,000 in revenue), payroll if you will hire, and corporate income tax. Professional service fees are HST-taxable.
Full guide: CRA Registration - 4
Carry professional liability (E&O) insurance
Errors & omissions insurance is the core coverage for a professional practice — and a firm-authorization condition for regulated professions. It protects against claims arising from your professional advice, designs, or certifications.
Full guide: Insurance - 5
Stand up your practice operations
Business banking, professional accounting, engagement letters and contracts, and the project and document workflows a practice runs on. This is the back office that keeps you paid and protected.
Full guide: Operational Setup
Your launch checklist
The whole page in one list.
- Set up your design practice
- Incorporate (or form a professional corporation)
- Set up your CRA accounts
- Carry professional liability (E&O) insurance
- Stand up your practice operations
Turn authorization into a working practice
Once the firm can practise, the next work is commercial: define the fee, prepare a credible proposal, and put a repeatable operating rhythm behind the professional work.
Put the guide to work
Use the setup on a real opportunity.
A business or practice becomes real when it can follow a lead, prepare a pursuit, and carry commercial work forward.