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restaurant fit-out is not a commercial renovation with a kitchen in it. It is several approval processes running at once, and the one that most often derails a project has nothing to do with construction quality. We have seen operators sign a five-year lease on a promising unit, pay for design, then discover the building has no viable route for a kitchen exhaust duct, the zoning does not permit a restaurant, or a grease interceptor has to go into a slab that cannot be cut. By then every option is expensive. This guide covers what a GTA fit-out requires, in the order the requirements arrive, with a focus on the three areas carrying the most cost and risk: health approval, grease management and kitchen exhaust.
Phase One: Four Checks Before You Sign
Most delays trace back to work done in the wrong order. Answer these four questions before a lease is executed; each is difficult or impossible to fix afterward:
- Does zoning permit a restaurant here? Not all commercial zoning allows food service, and some allows it only with conditions on size, hours, patios or parking. A former retail unit may need a change of use, its own approval process.
- Is there a route for kitchen exhaust? The most common deal-breaker. A grease duct must run from the hood to a discharge point, usually a roof-mounted upblast fan. In a multi-tenant building that means a dedicated shaft or the landlord’s written permission to penetrate the roof and pass through space you do not lease. Get it in writing before signing.
- Is there enough gas and electrical capacity? Cooking equipment and a make-up air unit are large loads, and service or gas meter upgrades run on utility timelines often measured in months.
- Is there existing grease infrastructure? A former restaurant may already have an interceptor. A retail unit almost certainly does not.
| Protect yourself in the lease. Wherever possible, make the lease conditional on zoning confirmation and approvals, and make sure the rent-free fixturing period reflects a realistic approval timeline, not an optimistic one. |
Public Health Approval
Food premises in Ontario are regulated under the Health Protection and Promotion Act and the Food Premises Regulation (O. Reg. 493/17), enforced locally by Toronto Public Health and the Peel, York, Halton, Durham and Hamilton health units, each with its own process. Most offer or expect a plan review before construction. Building first and asking later is how operators end up demolishing finished work.
- Sinks are where reviews get sent back. Expect dedicated hand sinks in food preparation areas, a multi-compartment sink or commercial dishwasher for washing and sanitizing, typically a separate food preparation sink, and a mop or service sink. Designers unfamiliar with food premises draw too few, and the fix means moving plumbing.
- Finishes must be smooth, non-absorbent and cleanable on floors, walls and ceilings in food areas: quarry tile or sealed commercial flooring with coved bases, washable panels behind wet and cooking areas, and washable ceiling systems. Residential-grade finishes will not pass.
- Equipment, storage and washrooms are also reviewed: adequate refrigeration with temperature monitoring, dry storage separate from chemicals, garbage storage, pest control, and staff and patron washrooms.
Expect a pre-opening inspection after construction and before you serve a single customer, and build it into the schedule.
Grease Interceptors
Every GTA municipality regulates restaurant sewer discharge through a sewer-use bylaw, because grease congeals in municipal lines and causes blockages. Enforcement is real.
- What connects to it. Fixtures that discharge grease, such as pot and prep sinks, wok stations and kitchen floor drains, generally go through the interceptor; whether a dishwasher connects depends on the interceptor type and local rules. Toilets and washroom sinks must not. Get this separation right at rough-in, because correcting it later means opening the slab.
- Two types, very different costs. Hydromechanical interceptors are compact units near or under sinks, sized by flow rate, for smaller kitchens, typically a few thousand dollars installed. Gravity interceptors are large tanks, usually in-ground outside, sized by volume for higher-volume kitchens, and far more expensive, especially when excavation runs through an existing slab or parking lot.
- Sizing is calculated, following CSA standards and based on connected fixtures and flow rates. An undersized unit passes grease straight through, fails inspection and invites enforcement.
- Maintenance is a legal obligation. Bylaws require regular servicing with records kept and produced on request. Plan access for a pump truck or technician at design; an interceptor that cannot be serviced is a problem for the life of the lease.
Kitchen Exhaust and Make-Up Air
Commercial kitchen ventilation is the most technically demanding and expensive mechanical system in a restaurant, and where cutting corners has the most serious consequences.
| Element | What It Requires |
| Grease hood (often called Type I) | Over any appliance producing grease-laden vapour: fryers, griddles, charbroilers, ranges and woks. A listed assembly with baffle filters and a welded grease duct. Using a light-duty heat and steam hood here is a fire hazard and will fail inspection. |
| Heat and steam hood (often called Type II) | Over dishwashers and some ovens. Much simpler and cheaper. |
| Grease duct | Liquid-tight and continuously welded, sloped to drain back toward the hood, with cleanouts, required clearances or a listed wrap or rated enclosure, no shared shaft and no dampers. Cost is driven largely by route length. |
| Fire suppression | A wet chemical system with nozzles over appliances and in the duct, shutting off gas and power to the line on activation, with a manual pull station and fire alarm connection where present. Moving appliances later means re-engineering it. |
| Make-up air | Replaces exhausted air. Without it the space goes negative, the hood stops capturing, doors stick and gas appliances can backdraft. In Ontario it must be heated in winter. |
| Discharge location | Minimum distances from air intakes, operable windows, neighbouring properties and the roof surface. In dense areas, this is where odour complaints start. |
A make-up air unit is often the largest single mechanical cost in the project, and the item most often missing from an inexpensive quote.
The Other Approvals You Will Meet
- A building permit, and a change of use if converting from another occupancy, which can trigger exits, washroom counts, fire separations and sprinklers based on occupant load
- TSSA requirements for gas piping and appliance connections
- An ESA notification for electrical work
- Barrier-free requirements under the Building Code and AODA for the entrance, path of travel, washrooms and service counters
- Backflow prevention under municipal cross-connection rules
- AGCO liquor licensing if you serve alcohol, which depends on building and fire compliance being complete
Timeline and Cost in the GTA
| Item | Typical Range |
| Design and drawings | 4 to 8 weeks |
| Plan review and permits | 4 to 12 weeks, varying by municipality |
| Construction, full fit-out | 8 to 20 weeks |
| Signed lease to opening | About 6 to 9 months, longer with a service upgrade or change of use |
| Full fit-out from a bare or retail shell | $200 to $450 per sq. ft. |
| Exhaust and make-up air package | $30,000 to $80,000 |
| Fire suppression | $7,000 to $18,000 |
| Hydromechanical interceptor, installed | Low thousands |
| In-ground gravity interceptor | $15,000 to $45,000+, driven by excavation |
These are planning ranges, and every one of them is driven by decisions made in Phase One.
Planning a Restaurant Fit-Out in the GTA?
At Maple Leaf Quality Renos, commercial fit-out work is coordinated across all of these streams rather than treated as construction with approvals attached. We assess base building capacity and exhaust routing before you commit to a space, coordinate health plan review alongside permit applications, and manage the trades and sign-offs through to occupancy.
Contact us for a free, no-obligation consultation and a detailed written estimate.
📞 +1 (647) 496-3360
✉ contact@mapleleafqualityrenos.ca
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