Building Without a Permit in Ontario: 6 Assumptions That Stop Projects
Nobody plans on building without a permit in Ontario. It happens through a reasonable sounding assumption: the work is small, the vendor said it was fine, or someone else is handling it. By the time the assumption is tested, the furniture is ordered and a move date has been announced.
This post covers the six assumptions we hear most on commercial interior projects, what happens when they are wrong, and how to check before anyone starts. If you want the general rule first, start with does my Toronto office project need a building permit.
Six assumptions that lead to building without a permit in Ontario
"It is only demountable walls, so no permit."
Demountable partition systems are still partitions. If they interrupt sprinkler coverage, affect exiting, or create rooms that change the occupant load calculation, the Code treats them like walls. Some systems are exempt and some are not, and the answer depends on how they are installed, not what the manufacturer's brochure calls them. Do not rely on the vendor's assurance, because the vendor is not the party who receives the stop work order.
"It is just a kitchenette."
People think of a kitchenette as furniture. If there is a sink, there is plumbing, and plumbing is permit work.
"It is just a cooling unit for the server room."
Supplementary cooling is almost always mechanical work and almost always a permit. It is frequently discovered after the IT team has already ordered the equipment, which is the worst moment to learn it.
"The landlord is handling it."
Sometimes true. Often the landlord is handling base building work and the tenant is responsible for the tenant permit. These are two different permits with two different applicants. Our post on base building vs tenant work covers the scope split. Confirm in writing who is applying and for what.
"We are not changing anything structural."
Structure is one trigger among many. Walls, doors, ducts, pipes and sprinklers can each trigger a permit without touching the structure.
"We are not building anything, only changing how we use the space."
You can change how a space is used without touching a wall and still need a permit, because the occupancy classification drives exiting, ventilation and washroom counts. Turning storage into occupied office, or office into an assembly or medical use, is a permit matter even if the layout stays identical.
What the six have in common
Each assumption treats the work as belonging to a safer category than it really does: furniture, finishes, someone else's scope, or a change that is invisible because nothing was built. The Building Code does not sort work by how it feels. It sorts by effect on life safety, exiting, ventilation, plumbing and use.
A simple habit catches most of these. Before any work starts, ask what the work touches, not what it is called.
Why people skip the permit, and why it does not work
The usual reason is schedule. A permit takes time, the tenant has a lease commencement date, and someone decides to start and apply in parallel. Occasionally that works. When it does not, the outcomes are a stop work order, a requirement to open up completed work for inspection, and in a change of use situation, the possibility that the space cannot be occupied at all.
Not sure whether your plan is a permit project? Book a call and we can talk it through before anyone starts.
The penalties
Under the Building Code Act, an individual found guilty of building without a permit can be fined up to $50,000 for a first offence and up to $100,000 for later ones. For a corporation the maximums are $500,000 and $1,500,000 (Government of Ontario).
Insurance and sale risk
Unpermitted work can complicate an insurance claim. It can also surface during due diligence when the building is sold or refinanced, and then it becomes the current owner's problem.
If schedule is what worries you, our post on building permit timelines in Ontario sets out what to plan for, and how to shorten a commercial permit timeline covers what is in your control.
How to find out for certain
Bring a designer in before you commit to a schedule. A test fit costs a fraction of a week of delay, and the person who draws it will tell you immediately whether the layout is a permit project.
If the answer is unclear, Toronto Building runs preliminary zoning reviews. A zoning use review is the narrower option, for confirming whether a use is allowed at all. A Zoning Applicable Law Certificate combines a zoning and applicable law review before you apply, and the City says an issued certificate enables a complete building permit application. It replaced the older Preliminary Project Review service in March 2022 (City of Toronto). Your designer or contractor can tell you which one fits.
Questions to ask before anyone starts
What does this work touch: walls, doors, ducts, pipes, sprinklers, electrical or use?
Who is applying for the permit, and for which scope?
Has the vendor's claim been confirmed by the designer, not only by the vendor?
Is the use of the space changing, even if the layout is not?
The honest summary
Most unpermitted work starts with a sensible sounding assumption, not with an intent to avoid the rules. Each of the six above sounds smaller than it is.
When the answer is genuinely borderline and the work is significant, applying is usually cheaper than the alternative. A permit you did not strictly need costs a fee and some time. Unpermitted work that should have been permitted costs a stop work order, opened-up finishes, and a problem that surfaces during a sale or refinancing.
Carolee Turner
Bringing affordable commercial construction back to the Canadian market through client advocacy, practical project value, and relationships that move opportunities forward.
construction@caroleeturner.com 416 575 6869 linkedin.com/in/carolee-w-turner-2002417
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