Choosing the right professional matters more than choosing the right paint colour. When people plan a renovation, they often use “interior designer” and “interior decorator” as if the two jobs are the same. They are not. The real difference is not about who is “allowed” to do what; it is about training, and how deep that training goes.
Here is the short version: a decorator is trained in how a room looks, and a designer is trained in how a space is built as well as how it looks. Both can make a home better. They are simply trained for different work.
What an interior decorator does
An interior decorator focuses on the look and feel of a finished room. That covers paint colours, furniture, lighting choices, window treatments, rugs, art and styling. If your layout already works and you want the room to feel considered and pulled together, a decorator can be a good fit.
There is no formal education required to work as a decorator. Many take short courses or earn a decorating certificate centred on colour, materials and furnishings. That training does not cover building structure, mechanical systems or the building code, because that is not what the role is about.
What an interior designer does
An interior designer is trained on the space itself, not only its surfaces. In Ontario that path is long: several years of formal post-secondary education, thousands of hours of supervised experience, and professional exams. Many designers register with ARIDO, the Association of Registered Interior Designers of Ontario.
That education is the heart of the difference. A designer studies space planning, building structure, mechanical, electrical and plumbing systems, life safety and the building code, alongside the look of a space. So when a renovation involves more than furniture, a designer has been taught how the building actually works and where the limits are.
One related credential is the BCIN (Building Code Identification Number). It is an Ontario qualification earned by passing the Ministry’s building-code exams, and it is what lets someone prepare certain permit drawings. A BCIN is not tied to a job title, and anyone can sit the exams. But the building knowledge those exams test is exactly what interior-design training is built around. Studio Kimi holds a BCIN.
Designer and decorator, side by side
| Aspect | Interior Designer | Interior Decorator |
|---|---|---|
| Training | Years of formal design education, supervised experience and professional exams; many register with ARIDO | Optional short courses or a decorator certificate; no formal education required |
| What that training covers | Space planning, building structure, mechanical, electrical and plumbing systems, life safety and the building code | Colour, furniture, finishes, fixtures and styling |
| Main focus | How the whole space works and is built | How a finished room looks and feels |
| Best suited to | Renovations involving layout, building systems or construction | Refreshing a room that stays as it is |
So which one is right for your project?
A simple way to think about it: are you restyling a room, or changing how it works?
- Restyling a room that stays as it is, with new colours, furniture and finishes, is decorating.
- Changing how a space works through a new layout, a kitchen or bathroom, or anything that involves building systems, structure or the code, calls for the deeper training an interior designer has.
Most renovations fall into the second group. Once a kitchen is rebuilt or a wall becomes part of the conversation, you want someone trained in how the building works, not only how it looks.
Where a design-build studio fits
There is one more option worth knowing about. A design-build studio brings the design and the construction under one roof, so the same team that plans your renovation also builds it. You are not handing a designer’s plan to a separate contractor and hoping nothing gets lost in between.
That is how we work at Studio Kimi. We are a BCIN-qualified design studio based in Oakville, and we take renovations across Mississauga, Oakville and Burlington from the first drawing to the finished room.
We do both, decorating included
One last point: you do not have to come to Studio Kimi only for the big projects. We provide interior decorating as well, so if you just want help with colour, furnishings, lighting and styling for a room that already works, we are glad to do that. You can start with a full renovation or simply a refresh, and the same trained team guides both.
Common questions
What is the difference between an interior designer and an interior decorator?
It comes down to training. An interior designer completes years of formal education covering space planning, building structure, mechanical and electrical systems, life safety and the building code, plus supervised experience and professional exams. An interior decorator focuses on the look of a room: colour, furniture, finishes and styling. Both improve a home, but a designer is trained in how the space is built, not only how it looks.
Do I need a designer or a decorator for my renovation?
If your project involves a new layout, a kitchen or bathroom, or anything that touches building systems or structure, a designer’s training is what the work calls for. If you are keeping the layout and only refreshing the look, a decorator may be all you need.
Can an interior decorator do the same work as an interior designer?
A decorator can make a room look beautiful. The difference is depth of training: a decorator’s courses focus on styling and furnishings, while a designer is educated in building structure, systems, safety and the code. For work that affects how a home is built, that training is what matters.
What is a BCIN?
A BCIN (Building Code Identification Number) is an Ontario qualification earned by passing the Ministry’s building-code exams. It allows the holder to prepare certain building-permit drawings. It is not tied to any job title, but the building knowledge it tests is what interior-design training is built around. Studio Kimi holds a BCIN.
Does Studio Kimi provide interior decorating services?
Yes. Alongside our design and design-build work, we provide interior decorating, which covers colour, furnishings, lighting and styling for a room that already works. You can come to us for a full renovation or simply a refresh.