The architect vs BCIN designer question comes down to licensing and building type. In Ontario, only a licensed architect (a member of the Ontario Association of Architects, or OAA) can use the title “architect” and stamp drawings for regulated buildings. A BCIN designer holds a Building Code Identification Number, which lets them prepare and submit permit drawings for certain building types, typically houses and small buildings. Many single-family homes, basements and small additions may fall into the second group, while larger or more complex buildings are generally expected to involve an architect. Exact thresholds depend on the Ontario Building Code and the Building Act, so confirm with the City of Toronto or the OAA before choosing a path. This guide explains where that line sits, how the two roles differ in cost and involvement, and how to decide for your own project.

The Short Answer: Licensing, Title and Legal Scope in Ontario

The two roles are not interchangeable labels for the same job. They are different credentials with different legal footprints. Which one your project needs depends on its size, use and complexity, so confirm with the City of Toronto or the OAA rather than relying on any general guide, including this one.

Architect. The title is protected by law in Ontario. Only professionals licensed through the OAA can call themselves architects and stamp drawings for regulated buildings. An architect’s education, competencies and professional responsibilities differ from a designer’s, and the licence is held through a regulating body.

BCIN designer. A Building Code Identification Number is what allows a designer to prepare and submit permit drawings for certain building types. A qualified BCIN designer knows how to apply municipal by-laws and the Building Code to a drawing set so that it can be reviewed and permitted.

Think of it this way: the BCIN answers the question “can this person submit permit drawings for this kind of building?” The architect licence answers a broader one: “is this person licensed to practise architecture, including for buildings the code reserves for architects?”

When Ontario Law Requires an Architect (Size, Use and Part 3 Buildings)

The Ontario Building Code organizes buildings into two main streams. As a general guideline, Part 9 covers houses and small buildings (often described as three storeys or fewer and under about 600 m² in building area), while Part 3 covers more complex buildings such as commercial, institutional and mixed-use projects. Drawings for buildings that fall under Part 3 are generally expected to be prepared and stamped by a licensed OAA architect (confirm the exact requirement with the OBC, the OAA or the City of Toronto). These figures are commonly cited rather than quoted from the Code itself, so confirm the exact definitions against the Ontario Building Code and the Building Act, or with the City of Toronto or the OAA.

Some practitioners also state that residential buildings over 600 m² (about 6,458 sq.ft.) require an architect. Treat that as a rule of thumb rather than a legal citation: exemptions and definitions in the Building Act and the Code are detailed, and the exact test depends on building area, number of storeys and use. If your project is anywhere near these numbers, ask the City of Toronto’s building department or the OAA to confirm before you commit to a design path.

These are not code tests, but they are useful questions to raise with the City of Toronto or the OAA early:

• Is the building intended for uses beyond a typical house?
• Does the project involve a change of use, and how does that affect which Code part applies?
• Is the building large, tall or complex enough that it may fall outside Part 9?

Getting this wrong can affect your permit timeline, so it is worth confirming rather than assuming.

What a BCIN Designer Can Do: Part 9 Houses, Basements and Small Additions

For work clearly within Part 9, a qualified BCIN designer can often handle the permit submission. Typical examples include a new single-family home within Part 9 limits, a rear or second-storey addition, an interior renovation with structural changes, and a basement alteration or second suite. For small residential renovations such as a bathroom or finished basement, a BCIN designer may be entirely appropriate, and an architect may not be proportionate to the scale of the work.

Keep in mind that structural work generally needs a building permit. Examples cited by practitioners include new construction, structures over 10 square metres, and renovations or changes of use of a building. Treat these as examples and confirm with the City of Toronto’s building department whether your project needs a permit. A BCIN designer’s job is to translate your goals into drawings that satisfy the Code and municipal rules so the permit can be issued. Depending on the project, additional consultants such as a structural engineer, or a zoning review or minor variance, may be needed; ask your designer how they handle these.

A BCIN designer is not a shortcut around the rules. They are bound by the same Building Code, and the word “may” matters: even small projects can have complications that push them toward an architect or additional consultants.

Architect vs BCIN Designer Side by Side: Scope, Cost, Involvement and Liability

The table below summarizes the practical differences. It describes typical patterns, not fixed rules; individual firms structure services differently.

Why costs differ. A BCIN designer is often more cost-effective, but the reason is scope, not quality. Fees generally reflect how much the professional is being asked to do: a permit-focused drawing set is a narrower deliverable than full design development with consultant coordination and construction-phase review. We have not quoted dollar figures here because they vary widely by project and firm; ask each for a written scope so you can compare like with like. For a Toronto-specific view of what drives drawing costs, see how much building permit drawings cost in Toronto.

Involvement and design depth. Beyond the stamp, an architect typically weighs your site, budget and long-term needs together, and coordinates structural, mechanical and electrical consultants under one design. That can matter on a custom home where layout, light and massing drive value. A designer working to a permit-focused scope may deliver exactly what you ask for, but you should confirm whether design exploration and construction-phase support are included.

Liability. Both professionals are accountable for the drawings they prepare and submit. The architect’s seal carries the weight of the licensing body. For specifics about insurance and responsibility, ask each professional directly and read the agreement before signing.

How to Decide: A Practical Checklist for Toronto and North York Projects

Use these hypothetical scenarios as starting points, then confirm details with the City of Toronto or a qualified professional.

• Basement apartment or second suite. Usually Part 9 work where a BCIN designer is commonly engaged, with attention to egress, fire separation, ceiling height and servicing. See legal basement design and permits for what is involved.
• Rear or second-storey addition to a house. Often Part 9; a BCIN designer plus structural engineer is a common team. Zoning limits on height, coverage and setbacks may require a minor variance.
• Garden suite or laneway suite. Small footprint, but zoning, servicing and fire-access rules are site-specific. Confirm the applicable Code part and approval path with the City or an architect before choosing your designer.
• Fourplex, sixplex or other multiplex. Size, number of storeys and use may affect which Code part applies, so do not assume Part 9. Ask the City of Toronto or an architect to confirm the applicable Code part early. Our overview of 4-plex and 6-plex design and permits explains the common considerations.
• Custom infill home. Depends on size and design ambition. A design-led custom home may benefit from an architect’s broader involvement even where Part 9 applies; a simpler home may be well served by a BCIN designer.

Then ask yourself:

1. Is the building clearly within Part 9 by size, storeys and use?
2. Do I want design exploration and construction-phase involvement, or primarily permit-ready drawings?
3. Will the project need a variance, severance or other planning approval first?
4. Do I need coordinated consultants (structural, mechanical, electrical) under one lead?

If you are still sorting out who does what on a build, interior designer, architect or contractor: who do you need gives useful context.

How Delvin Dream Homes Fits In: Design, Permits and Coordination

Delvin Dream Homes works in North York and Toronto, with services that include custom home design, legal basement projects and multiplex design and permits. Who prepares and stamps the drawings depends on your project, so please confirm directly with Delvin whether a BCIN designer or an architect would be involved in yours, and their licensing status, before you proceed.

If you are weighing an architect against a BCIN designer, the most useful first step is to share your site, goals and any zoning concerns so the right path can be identified early. You can learn about our custom home design approach, or contact Delvin for a no-pressure conversation about your project.