Commercial Construction
Commercial Kitchen Construction in Orange County, California
6 min read
A commercial kitchen is an engineered ventilation and sanitation system that happens to contain cooking equipment. Where the hood can go decides where the cook line goes, the cook line decides the plumbing and gas layout, and the sanitation requirements decide every finish in the room. Benitez Contractors builds commercial kitchens across Orange County for restaurants, ghost kitchens, commissaries, grocery and prepared food operations, hotel and banquet facilities, schools and corporate cafeterias. The regulatory load is heavier here than on any other commercial interior: city building plan check, Orange County Health Care Agency Environmental Health plan check, fire authority review of the hood suppression system, sanitation district requirements for grease interception, and a mechanical design that has to move large volumes of air without depressurizing the building. This page explains what governs each of those, in the order the decisions have to be made.
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Type I or Type II: Which Hood Does Your Equipment Require?
The equipment schedule determines the hood, and the hood determines almost everything else. A Type I hood is required over appliances that produce grease and smoke, meaning fryers, griddles, charbroilers, ranges, woks, tilt skillets and solid fuel equipment. It is a listed grease hood served by listed grease-rated ductwork with welded liquid-tight seams, a defined slope back toward the hood or toward a grease reservoir, access panels at every change of direction, and either the required clearance to combustibles or a listed grease duct enclosure or field-applied wrap. The duct runs continuously to a listed exhaust fan that discharges above the roof at code-required distances from air intakes, operable openings and property lines. A Type II hood handles heat, steam, odor and products of combustion where no grease is present, so it serves dishwashers, most ovens, steam kettles and warewashing, and it can use standard galvanized ductwork. Putting a grease appliance under a Type II hood is a plan check rejection and a fire hazard, so the equipment schedule has to be final before the mechanical drawings are produced.
- Type I applications: Fryers, griddles, charbroilers, ranges, woks, tilt skillets and solid fuel equipment. Listed grease hood, welded grease duct, fire suppression and rooftop discharge required.
- Type II applications: Dishwashers, steam kettles, most ovens and warewashing. Heat, steam and odor only, standard ductwork acceptable, no grease suppression required.
- Duct construction: Grease duct requires liquid-tight welded seams, slope back to the hood or reservoir, access panels at direction changes, and clearance or a listed enclosure or wrap.
- Fire suppression: A separately permitted and inspected wet chemical system tied to automatic fuel shutoff, the building fire alarm and a manual pull station at the egress path.
How Does Grease Duct Routing Decide Where a Kitchen Can Go?
Hood placement is usually the single largest constraint on a kitchen layout, and it is decided by the path the duct can take to the roof. Grease duct wants a short, direct, sloped run with as few offsets as possible. Every horizontal run needs slope and access panels, every offset adds cost and cleaning difficulty, and any run through another tenant space, a corridor or a different fire area requires a rated enclosure or a listed wrap that adds thickness and coordination. In a multi-tenant building the duct may not be permitted to cross a demising wall at all. On the roof, the exhaust fan has to land at required distances from air intakes, operable windows and property lines, on a curb that the structure can carry, with a grease containment device and access for cleaning. In older Orange County multi-tenant retail, an existing hood shaft from a previous food tenant is worth more than the square footage around it. When we evaluate a shell for a kitchen, we look at the roof and the duct path before we look at the floor plan.
Why Does Makeup Air Make or Break the Exhaust System?
An exhaust hood removes a large volume of air from the building, and that air has to be replaced or the kitchen simply cannot exhaust. Without engineered makeup air, the space goes negative, the hood loses capture, smoke rolls out at the front edge, exterior doors become difficult to open, gas appliances can backdraft, and neighboring tenants get your cooking odors through the return path. Makeup air is a designed system: a dedicated unit that tempers and delivers replacement air near but not into the hood capture zone, interlocked to start with the exhaust fan, balanced so the kitchen sits slightly negative relative to the dining room and the dining room sits slightly positive relative to outside. Tempering matters in practice, because dumping unconditioned air onto a cook line in an Orange County summer is unpleasant and in winter it can push kitchen temperatures below comfortable working range. The system gets tested and balanced with documented readings before final inspection, and a hood that captures during the balance test but not during service usually means makeup air was undersized on paper.
What Does Orange County Health Plan Check Require?
Food facilities in Orange County submit to the Orange County Health Care Agency Environmental Health food facility plan check, and that review runs in parallel with city building plan check rather than after it. Both must clear, and neither substitutes for the other. Health review focuses on sanitation: floors, walls and ceilings that are smooth, durable, non-absorbent and easily cleanable in all food prep, warewashing, storage and restroom areas, coved base at every floor to wall junction, handwash sinks located within the required distance of food preparation and warewashing areas with hot water, soap and towels, a three-compartment warewashing sink sized to the largest utensil plus a separate mop or service sink and a separate food prep sink, indirect waste with proper air gaps on all food-related equipment, a water heater sized to recover for the full fixture and equipment load, adequate ventilation and lighting with shielded fixtures, and dedicated storage for chemicals away from food. A separate pre-opening inspection follows construction, and it is not the same visit as the building final.
- Submit in parallel: Start the health submittal the same week as the city submittal. Sequential submissions are the most common reason food facility schedules slip by a month or more.
- Finish requirements: Smooth, non-absorbent, cleanable floors, walls and ceilings with coved base. Quarry tile, sealed epoxy, FRP panels and washable ceiling systems are the usual compliant choices.
- Sink count and placement: Three-compartment warewashing, a separate prep sink, a dedicated mop sink and handwash sinks within required travel distance of every prep and warewashing area.
- Pre-opening inspection: A separate health inspection after construction and before opening, distinct from the building final. Equipment must be in place and operating for it to pass.
How Do Grease Interceptors, Floor Sinks and Indirect Waste Work?
Kitchen waste plumbing has two jobs: keep grease out of the sewer and keep sewer risk out of the food. Grease interception is sized by the local sanitation district and the city, not by the equipment manufacturer, and the requirement varies across Orange County. Small operations may be allowed a point-of-use hydromechanical grease interceptor under the three-compartment sink. Larger kitchens are typically required to install an in-ground gravity grease interceptor sized in gallons based on fixture load, seating count and hours of operation, and that means excavation, a vault, an access lid rated for the traffic above it and a maintenance contract with manifested pumping records. Discovering an in-ground interceptor requirement after the slab work is complete is a genuinely expensive surprise, so we confirm it during feasibility. Inside, every food-related fixture drains indirectly. Prep sinks, ice machines, dipper wells, steam equipment, walk-in condensate and dish machine drains discharge through an air gap into a floor sink rather than connecting directly to the drainage system, which prevents any possibility of backflow into food contact equipment.
Scope
What's Included
Everything below is written into your scope of work before construction starts. Anything outside it requires a signed change order first.
- Feasibility and shell evaluation: Roof and duct path assessment, existing shaft evaluation, gas and electrical capacity check, and confirmation of grease interceptor requirements before design begins.
- Mechanical design coordination: Hood selection and sizing, exhaust and makeup air calculations, duct routing, rooftop fan and curb design, and structural review of new roof loads.
- Health and building plan check: Parallel submittal to city building plan check and Orange County Health Care Agency Environmental Health, with correction responses on both tracks.
- Hood, duct and suppression installation: Listed hood set, welded grease duct with access panels and required enclosure, rooftop exhaust fan, and coordination of the separately permitted suppression system.
- Sanitary finishes: Quarry tile or seamless epoxy flooring with integral coved base, FRP or sealed wall panels, and washable ceiling systems in all food handling areas.
- Process plumbing and gas: Floor sinks, indirect waste and air gaps, three-compartment and prep sinks, handwash sinks, mop sink, grease interception, water heater sizing and gas piping with shutoffs.
- Kitchen electrical: Equipment circuits, disconnects, GFCI protection, hood control panel, fan interlocks, and shielded fixtures in food areas at required light levels.
- Testing, balancing and inspections: Air balance with documented capture readings, suppression system acceptance test, fire final, health pre-opening inspection and building final.
How it works
Our Process
Every project follows the same structured sequence, so you always know what happens next and who to call.
Equipment Schedule and Feasibility
2 to 3 weeksThe final equipment list drives hood type and size. We verify duct routing to the roof, structural capacity for the fan and curb, gas and electrical capacity, and the grease interceptor requirement for that jurisdiction.
Design and Engineering
4 to 7 weeksKitchen layout, mechanical exhaust and makeup air calculations, plumbing and gas design, electrical loads, and the sanitation finish schedule are documented for both the city and health submittals.
Parallel Plan Check
5 to 12 weeksBuilding, mechanical, plumbing and electrical review at the city runs alongside Environmental Health food facility plan check and fire authority review of the suppression system.
Rough Construction
4 to 7 weeksUnderground plumbing and interceptor work, gas piping, hood and grease duct installation, rooftop fan and curb, makeup air unit, electrical rough and framing to the above-ceiling inspection.
Sanitary Finishes and Equipment Set
3 to 5 weeksFlooring with coved base, wall and ceiling systems, stainless steel installation, equipment set and connection, suppression system installation and hood control commissioning.
Balancing, Inspections and Opening
2 to 4 weeksAir balance with capture verification, suppression acceptance test, fire final, health pre-opening inspection, building final and certificate of occupancy.
Budget
What does it cost?
Real ranges, stated up front. Your written proposal replaces these estimates with fixed numbers for your actual scope.
Typical range
$175 to $500
square foot of kitchen area
2026 Orange County planning estimate for commercial kitchen construction, not a quote, and excluding owner-furnished cooking equipment. The low end assumes a second generation food space with a usable hood, duct shaft and interceptor. The high end assumes a new hood and grease duct, rooftop fan and structural work, an in-ground interceptor and full sanitary finishes.
Typical timeline: Plan five to nine months. Equipment selection and design take six to ten weeks, parallel city and health plan check five to twelve, construction ten to sixteen, and balancing plus the suppression, fire, health and building inspections another three to five weeks.
What moves the price
- Hood type, size and quantity: Type I hood length, capture height, listed construction and rooftop fan sizing scale directly with the cook line. Multiple hoods multiply the duct and suppression scope.
- Grease duct routing: A short vertical shaft is inexpensive. A long horizontal run with offsets, a rated enclosure or wrap, and structural coordination through occupied areas is not.
- Makeup air system: A tempered makeup air unit, its curb, gas or electric heat, controls and interlock is a substantial mechanical package that undersized budgets consistently omit.
- Grease interceptor: A point-of-use unit is a plumbing fixture. An in-ground gravity interceptor is excavation, a vault, a traffic-rated lid and site restoration.
- Sanitary finishes: Quarry tile with epoxy grout and coved base or a seamless troweled epoxy floor system costs several times what a standard commercial floor costs.
- Utility capacity: Gas meter and pipe sizing, electrical service capacity and hot water recovery frequently require upgrades that involve the utility and add weeks to the schedule.
Compare
Compare your options
Side by side, so you can weigh cost against how long it lasts and how much upkeep it needs.
| Option | Cost | Durability | Maintenance | Best for |
|---|---|---|---|---|
| Type I wall-mounted canopy hood | $400 to $750 per linear foot installed | Stainless steel listed assembly with a service life measured in decades | Filter cleaning weekly, certified duct cleaning quarterly to semiannually | Standard cook lines set against a wall with fryers, griddles and ranges |
| Type I island canopy hood | $600 to $1,100 per linear foot installed | Same construction, larger capture volume and higher exhaust rate | Higher, open perimeter capture requires more airflow and more frequent cleaning | Display and exhibition cooking where the line is visible from the dining room |
| Type I hood with UV or water wash | $900 to $1,600 per linear foot installed | High, active grease reduction extends duct cleaning intervals | Moderate, but the treatment system itself requires scheduled service | Long duct runs, odor-sensitive neighbors and high volume charbroiling operations |
| Type II condensate hood | $200 to $400 per linear foot installed | Stainless assembly with standard galvanized duct, long service life | Low, no grease filters or suppression system to service | Dish machines, steam kettles and ovens producing heat and steam without grease |
| Ventless hood with integrated equipment | $18,000 to $45,000 per unit | Good, tied to the service life of the listed appliance it serves | High, catalyst and filter replacement on a defined manufacturer schedule | Spaces with no viable duct path to the roof, subject to jurisdiction acceptance |
| Tempered makeup air unit | $22,000 to $60,000 installed | Rooftop packaged unit with a typical 15 to 20 year service life | Moderate, filter changes and seasonal service alongside the exhaust fan | Any kitchen with meaningful Type I exhaust, which is effectively all of them |
Answers
Frequently asked questions
Do I need a Type I or Type II hood?
Your equipment decides. Type I is required over anything producing grease or smoke: fryers, griddles, charbroilers, ranges and woks. Type II serves heat, steam and odor only, such as dish machines, steam kettles and most ovens. Finalize the equipment schedule before mechanical drawings begin.
Can a commercial kitchen go anywhere in a building?
No. The grease duct has to reach the roof on a sloped, accessible path with required clearances, and the exhaust fan must sit at code distance from air intakes and property lines. In multi-tenant buildings the duct often cannot cross a demising wall, which fixes the kitchen location.
What is makeup air and why does my hood need it?
Makeup air is engineered replacement air for the volume the hood exhausts. Without it the space goes negative, the hood loses capture, smoke rolls out, doors resist opening and gas appliances can backdraft. It is a designed, tempered, interlocked system, not an open door.
Does the health department review happen before or after the city?
In parallel, and both must clear. Orange County Health Care Agency Environmental Health runs its own food facility plan check alongside city building plan check. Waiting for city approval before submitting to health is the most common self-inflicted delay on food service projects.
What flooring is required in a commercial kitchen?
Smooth, durable, non-absorbent and easily cleanable, with coved base at every floor to wall junction. Quarry tile with epoxy grout and seamless troweled epoxy systems are the two standard compliant choices in Orange County. Sheet vinyl is accepted in some limited food handling areas.
Do I need an in-ground grease interceptor?
It depends on your sanitation district, your city, your fixture load, seating count and hours. Small operations sometimes qualify for a point-of-use hydromechanical unit. Larger kitchens typically require an in-ground gravity interceptor, which means excavation, so confirm the requirement during feasibility.
Is the hood fire suppression system part of the building permit?
No, it is separately permitted and separately inspected, usually through the fire authority. The system ties to automatic fuel shutoff, the building fire alarm and a manual pull station on the egress path. Its acceptance test sits directly in front of your certificate of occupancy.
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Next step
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