A restaurant kitchen is the most mechanically complex space in commercial construction. The combination of commercial ventilation, Type I and Type II hood systems, grease interceptors, fire suppression, specialized plumbing, and health department requirements means that mistakes made early in the design phase are expensive to correct once construction is underway.
This guide covers the key decisions in restaurant kitchen layout and the construction sequencing that prevents costly errors.
The Kitchen Layout Types and Their Construction Implications
Restaurant kitchen layouts follow established operational patterns, each with different construction implications:
Assembly line (linear). Equipment arranged in a straight line or parallel lines, ideal for high-volume quick-service operations. Construction advantage: HVAC and plumbing runs are concentrated, reducing the linear footage of services. Disadvantage: requires a long, uninterrupted wall run, not always achievable in irregular spaces.
Zone layout. Equipment grouped by function (prep zone, cook line, plating zone, dishwash zone). The most common layout for full-service restaurants. Construction implication: each zone may require its own ventilation and plumbing rough-ins; coordination of multiple independent service clusters adds complexity.
Island layout. Cooking equipment centered in the island with prep and service on perimeter counters. Allows workflow from multiple directions. Construction implication: island cooking requires structural ceiling work to drop ventilation to the island hood position; this affects the structural and mechanical design significantly.
Type I and Type II Hood Systems
This is the single highest-impact decision in restaurant kitchen construction. Getting it wrong creates code compliance problems, fire hazard, and expensive retrofit work.
Type I hoods are required over cooking equipment that produces grease-laden vapors: fryers, griddles, ranges, broilers, woks. Type I hoods are constructed with grease filters, a grease collection system, fire suppression, and exhaust fans rated for grease-laden air. The exhaust duct must be constructed of minimum 1.58mm (16-gauge) steel with liquid-tight continuous external welds, no exposed fasteners that grease can accumulate on.
Type II hoods are used over equipment that produces heat and moisture but not grease: dishwashers, steamers, ovens without open flames, coffee equipment. Type II hoods are less restrictive in construction but still require proper exhaust.
Makeup air. Every commercial exhaust system must be balanced with makeup air, fresh air introduced to replace the air exhausted. In most restaurant kitchens, the makeup air system is the most expensive HVAC component in the build-out. The design must balance the exhaust volume (which is significant for high-BTU cooking lines) against the need to condition the incoming air in a Canadian climate, heating it in winter without freezing the kitchen, and not over-cooling it in summer.
Grease Interceptors
Ontario municipalities require grease interceptors (also called grease traps) on all kitchen drains that discharge grease-laden wastewater. The interceptor captures grease before it enters the sanitary sewer system.
The size and location of the grease interceptor must be designed before the kitchen plumbing layout is finalized, it affects how drains are routed throughout the kitchen. A floor drain at the far end of the kitchen draining to a grease interceptor at the opposite end, under a concrete slab, is not a change you want to discover after the slab is poured.
For new restaurant build-outs in leased commercial spaces, the interceptor is typically located either:
- Inside the kitchen (often under a floor access panel), easier to service but takes floor space
- Outside the building in a vault, preferred for larger operations, less intrusive to kitchen operations, but requires exterior excavation and concrete work
The local municipality's sewer use bylaw specifies the required interceptor size based on the number of fixtures and the type of cooking operation. Confirm requirements with the city prior to finalizing the design.
Fire Suppression Systems
Type I hoods require an integrated fire suppression system, a wet chemical system that discharges over the cooking equipment and in the hood plenum in the event of a fire. These systems must be:
- Designed and installed by a licensed fire suppression contractor
- Integrated with the gas shutoff (the system must automatically shut off gas supply to cooking equipment upon discharge)
- Connected to the fire alarm system where required
- Inspected and certified semiannually
The fire suppression contractor must be engaged early in the design process, as the placement of nozzles, fusible links, and actuation hardware affects hood dimensions and equipment placement.
Health Department Requirements
In Ontario, new restaurant food service operations require approval from the local public health unit before opening. The health inspector reviews the kitchen layout for:
- Handwash sinks within required reach of food prep areas (typically one per 9 square metres of food prep area)
- Adequate refrigeration capacity for the menu
- Three-compartment sink for manual warewashing, or a commercial dishwasher
- Separation of raw and ready-to-eat food storage
- Sufficient dry and cold storage
- Floor and wall finishes that are smooth, non-porous, and washable
Engaging the health unit during the design phase, before permit drawings are finalized, allows you to confirm the layout meets requirements and avoid design revisions after permit submission.
The Right Sequence to Avoid Expensive Mistakes
The sequencing of restaurant kitchen design and construction determines whether you discover problems on paper or in the field:
- Finalize menu concept and equipment list, before the kitchen layout is drawn
- Engage equipment supplier, get rough-in drawings and specifications for each piece of equipment
- Design hood system around the cook line, hood size and position is determined by the cooking equipment lineup
- Design plumbing rough-ins, locate grease interceptor, floor drains, handwash sinks, and dishwasher drain before slab work begins
- Engage fire suppression contractor, confirm nozzle layout against hood and equipment placement
- Engage health unit, pre-submission review before permit drawings are finalized
- Submit for building permit, once all of the above are resolved
- Rough-in inspection before walls close, mechanical and plumbing rough-in must be inspected and approved before drywall
A contractor who does not follow this sequence will be making changes after walls are framed, pipes are in, and slabs are poured.
VNG has completed multiple restaurant build-outs across the GTA, managing the coordination between equipment suppliers, mechanical contractors, fire suppression specialists, and health authorities. Contact us to discuss your project.
Building a restaurant in Toronto or the GTA? VNG manages full restaurant fit-outs from commercial kitchen MEP to front-of-house millwork. Request a restaurant renovation quote with a realistic timeline for your opening date.
Ready to start your project?
Tell us what you're building. We'll come back with a clear scope, honest timeline, and a number you can trust.