What Does a Commercial Kitchen Hood and Grease Trap Really Cost in a Buildout in 2026?

The moment the fryer wrecked the pro forma

Picture a 2,400-square-foot second-generation retail space in a neighborhood strip center. The listing says "restaurant-ready." There is a floor drain, a gas meter, and a hole in the roof where somebody's exhaust fan used to sit. The tenant is a first-time operator opening a fast-casual sandwich concept, and the pro forma carries $110,000 for total buildout with $65,000 of that earmarked for equipment, furniture, and signage. Mechanical is a $30,000 line item, because a contractor friend once said "a hood runs about thirty grand."

Then the menu gets finalized. Somebody adds hand-cut fries. One fryer. That single decision converts the entire kitchen from a heat-and-moisture operation into a grease-laden vapor operation, and every code path downstream changes with it. The hood becomes a Type I grease hood instead of a Type II condensate hood. The duct becomes liquid-tight welded 16-gauge steel with an access-panel schedule and a fire-rated enclosure through the roof instead of galvanized seam duct. A wet-chemical suppression system with nozzles aimed at each appliance, a fusible-link pull station, and a gas-valve interlock becomes mandatory. Exhaust rises from roughly 1,200 CFM to somewhere between 3,000 and 5,000 CFM, which means a tempered make-up air unit has to push nearly that much conditioned air back into the room or the space goes negative, the front door becomes hard to open, and the hood stops capturing smoke.

The revised mechanical number comes back at $71,000. Then the plumbing plan review lands: the municipality requires a 1,500-gallon exterior gravity grease interceptor because the space has never operated as a food-service tenant and there is no interceptor on the sewer lateral. That is excavation through a shared parking field, a concrete tank set with a crane, re-trenching the kitchen waste line, traffic-rated lids, and a restoration of the asphalt. Bid: $28,000. The $30,000 assumption is now $99,000, the contingency is gone, and the opening date slides two months because the interceptor work requires a separate right-of-way permit.

None of this was a surprise to the code. All of it was a surprise to the operator, because the cost was decided at menu design and discovered at permitting. The distance between those two moments is where restaurant budgets die. The rest of this page walks the mechanism, the real ranges, the alternatives, and the specific lease and sequencing moves that keep the number from detonating.

How the classification cascade actually works

The entire cost structure hangs off one binary question that a mechanical code official answers, not your contractor: does the equipment under the hood produce grease-laden vapor? Fryers, griddles, char-broilers, open ranges, woks, salamanders, and tilt skillets do. Convection ovens, steamers, combi ovens in steam mode, warewashers, and proofers generally do not — they produce heat and moisture. Type I covers the first list. Type II covers the second.

That single classification then cascades into six dependent systems, and each one carries its own cost, its own permit, and its own inspection.

The hood itself changes construction. A Type I canopy is welded stainless with a grease gutter, removable baffle filters listed for grease extraction, and a listing under the applicable UL standard for exhaust hoods. A Type II condensate hood can be lighter-gauge, needs no baffle filters, and often uses simple mesh or nothing at all.

The duct changes construction. Type I grease duct is continuously welded, liquid-tight, sloped back to the hood, with cleanouts at every change of direction and enough clearance to combustibles that you frequently have to build a rated shaft or use a listed factory-built grease duct assembly through the roof. Type II duct can be ordinary galvanized ductwork with taped seams.

Fire suppression appears only on the Type I branch. The wet-chemical system is engineered per appliance — nozzle count and placement depend on your exact lineup — and it has to interlock with the gas supply so activation shuts the fuel off, plus a tie to the building fire alarm where one exists.

Air balance becomes a real engineering problem. Exhaust and make-up air have to be designed together, with a balancing report submitted at closeout. Under-supplying make-up air is the single most common reason a hood fails its capture-and-containment test at final inspection.

The plumbing branch runs in parallel and answers a different question: which fixtures discharge fats, oils, and grease, and does the authority having jurisdiction accept a hydromechanical interceptor near the fixtures or demand an exterior gravity interceptor on the lateral? That answer depends on fixture count, drainage fixture unit load, the local pretreatment ordinance, and sometimes just the sewer district's standing policy for new food-service connections.

The practical lesson from the diagram is that everything expensive sits on the right-hand branch, and you enter that branch the instant one grease-producing appliance appears on the equipment schedule. There is no partial credit. A single fryer costs the same classification as a full broiler line.

Real numbers, ranges, and where they actually land

Treat the following as planning ranges for a typical single-unit restaurant of roughly 1,500 to 3,000 square feet in a mid-to-large U.S. market. Every one of them moves with local labor rates, building age, and how far the kitchen sits from the roof and the sewer.

Type I hood, canopy with baffle filters: $20,000–$50,000 installed. Length drives it — you are buying linear feet of hood, and an eight-foot single-wall canopy is a very different number from an eighteen-foot island canopy over a double cook line.

Wet-chemical fire suppression: $4,000–$10,000, driven by nozzle count and appliance mix, plus roughly $300–$600 per year for the semi-annual inspection cycle and periodic cylinder recharge.

Tempered make-up air unit: $8,000–$25,000 for the unit itself. Direct-fired gas heat is cheaper than indirect-fired; adding cooling or evaporative pre-cooling pushes you toward the top. Gas piping, electrical feed, roof curb, and controls for the MAU frequently add another $5,000–$15,000 on top of the equipment price, which is why this line is the one that most often blows past its budget.

Rooftop exhaust fan and welded grease duct: $6,000–$20,000. Duct footage and the number of offsets matter more than the fan. A kitchen sitting directly under an accessible roof section is cheap; a kitchen in the middle of a building that needs forty feet of rated shaft is not.

Roof curb, penetration, structural steel, fire-rated chase: $5,000–$20,000. If the existing roof structure cannot carry the fan and MAU dead load, you are into structural engineering and steel, and that is where this line runs to the top of the range or beyond.

Gas, electrical, controls, and interlocks: $4,000–$12,000. Includes the fan starters, the hood control panel, the gas solenoid valve, and the fire-alarm tie-in where the building has a monitored system.

Grease interceptor, hydromechanical: $500–$3,000 for the unit. Installed with the required vent, cleanout, and drain re-routing, the total commonly lands $2,500–$6,000.

Grease interceptor, exterior in-ground gravity: $10,000–$40,000 and up, installed. The tank is a small share of that. Excavation, shoring, crane set, traffic-rated lids, lateral re-trenching, and repaving are the bulk. Add right-of-way and pretreatment permit fees on top.

Design, permitting, and closeout: $5,000–$15,000 covering mechanical and plumbing engineering, the hood shop drawings, permit fees running roughly $500–$3,000, engineering stamps for exhaust calculations at roughly $1,000–$3,000, and the third-party air balance report the inspector will ask for.

Roll those together and a full Type I package with an exterior interceptor lands at roughly $60,000–$150,000. A Type II kitchen with a hydromechanical interceptor lands closer to $10,000–$25,000. That spread — call it a $50,000 to $125,000 swing — is the real answer to the question, and it is decided by the menu.

Geography moves the whole band. High-cost metros with strong mechanical trades push hood installation toward $35,000–$55,000 and interceptor work to the upper end of its range on labor alone. Mid-market cities sit meaningfully lower for identical scope. A second-generation space that already has a compliant hood, a sized interceptor, and adequate gas service can cut the mechanical and plumbing scope by half or more — which is exactly why second-generation restaurant space commands a rent premium and is worth paying for.

Operating costs continue after opening and belong in the pro forma, not the buildout budget: hood and duct cleaning on a schedule set by cooking volume, commonly monthly to semi-annually, at a few hundred dollars per visit for a typical single-unit kitchen; interceptor pump-outs every one to three months at roughly $150–$500 per service; and the suppression system inspection cycle noted above. A grease-heavy concept running a fryer bank and a char-broiler will sit at the frequent end of every one of those intervals.

Trade-offs worth pricing before you commit

There are only a handful of real levers, and each one trades money against menu, flexibility, or risk. Price all of them before the equipment order goes in, because after the hood is fabricated the decision is locked.

Design to Type II on purpose. If the concept can live on convection ovens, combi ovens, steamers, induction, and warewashing, you may legally qualify for Type II and avoid the suppression system, the welded duct, the rated chase, and most of the make-up air load. Realistic saving: $30,000–$60,000. The cost is menu range — no fries, no smash burgers, no char. For a bakery, a salad concept, a coffee-and-toast program, or a reheat-driven ghost-kitchen model this is genuinely viable. For anything that needs a flat-top it is not, and forcing it produces a kitchen that fails inspection or cannot execute the menu. Confirm the classification in writing with the mechanical official before you order equipment, because a verbal "that should be fine" is worth nothing at plan review.

Ventless or recirculating equipment. Some listed cooking appliances include integral catalytic and filtration systems and are permitted without a hood in some jurisdictions. The equipment costs more per unit and consumes more filter media, throughput is lower than an open fryer, and acceptance varies significantly by AHJ. Worth pricing for a very small footprint or a space where a roof penetration is impossible; not a general substitute for a hood line.

Demand-control kitchen ventilation. Variable-speed fan control with temperature and optical sensors modulates exhaust down when the line is idle. It adds a few thousand dollars to the control package and is required by energy code in some jurisdictions above certain exhaust volumes. It does not reduce first cost meaningfully — it reduces the conditioned air you throw away for the life of the lease, which on a kitchen running twelve hours a day is real money.

Untempered versus tempered make-up air. In mild climates a portion of make-up air can sometimes be untempered, which strips cost out of the MAU. In a cold or humid climate, untempered air makes the line unworkable and drives the building's own HVAC into a losing fight. This is a climate decision, not a budget decision, and pretending otherwise produces a kitchen nobody wants to work in.

Buying used. Used hoods and interceptors trade well below new. The traps are real: a used hood may not carry the listing your inspector wants to see, its length and appliance layout rarely match your line exactly, modification costs eat the discount, and the suppression system will be re-engineered and re-piped regardless. Consider it for a plain canopy of the right dimension from a known source; avoid it for anything where the paperwork matters.

Second-generation space versus shell. The largest single lever is not a product choice at all — it is which space you sign. A former restaurant with a compliant hood, a sized interceptor, adequate gas service, and existing roof penetrations can turn a $99,000 mechanical and plumbing scope into a $25,000 refresh. Even at a rent premium of several dollars per square foot, that math usually favors second-generation for an operator without deep capital reserves. This is the same logic any RevOps team applies when choosing to configure an existing system rather than build a new one: the integration work you inherit is worth more than the sticker discount you gave up.

Pitfalls that cost the most, and the specific move that avoids each

Assuming "restaurant-ready" means anything. It is marketing language with no code content. A space can be marketed as restaurant-ready with no interceptor, an undersized gas meter, and a roof that cannot carry a fan. The move: before the LOI is signed, get a written delivery specification into the lease naming the interceptor and its gallon capacity, the gas service and its BTU-per-hour capacity at the meter, the electrical service amperage and voltage, the roof structural capacity for the curb and equipment dead load, the grease waste line and its point of connection, and the HVAC stub. Vague "vanilla shell" language is how an operator inherits $80,000 of infrastructure they had budgeted at zero.

Treating permanent building infrastructure as tenant decor. An in-ground interceptor and a roof curb outlive your lease by decades and benefit every future tenant. Frame them as base-building work in negotiation. If the landlord will not fund them outright, ask them to fund and amortize the cost into rent at a stated rate — commonly in the 6–9% range — rather than paying cash from working capital you need for opening inventory and payroll. Restaurant tenant-improvement allowances commonly run in the $50–$100+ per square foot range for food and beverage space, higher for a credit tenant in a desirable center; anything above the allowance is exactly what amortization is for.

Discovering gas and roof capacity after signing. Total the connected BTU load of every gas appliance including the make-up air unit's burner, then confirm the meter and the utility's service can deliver it. A meter upgrade or a new service run from the street is a utility-scheduled item measured in months, not weeks. Same for structure: have the roof evaluated for the combined fan and MAU load before the lease is executed. Both belong in the lease as landlord representations, so a shortfall is the landlord's cost and not a change order against your contingency.

Ignoring the restoration clause. A standard restoration obligation can require you at lease end to remove the hood, demo the welded duct, patch and re-roof the penetration, cap the gas, and in some drafts abandon or remove the interceptor. That is a five-figure liability sitting at the far end of a ten-year lease, and it is entirely negotiable at signing and entirely non-negotiable afterward. Strike it, or cap it at a stated dollar amount, and get explicit written permission to leave the mechanical and plumbing infrastructure in place — it is an asset to the next tenant, which is the argument that usually wins.

Underestimating the schedule. A full commercial kitchen buildout with mechanical, plumbing, fire, and health plan review commonly runs four to eight months from lease execution to opening, and the interceptor's separate right-of-way permit can be the critical path all by itself. Rent that starts before revenue is pure loss. Negotiate abated rent covering the realistic construction and permitting window, and make the abatement clock start at permit issuance rather than lease execution where you can get it, so a slow plan review does not eat your free rent.

Routing the wrong fixtures through the interceptor. Only grease-bearing fixtures — three-compartment sinks, pre-rinse stations, mop sinks in some jurisdictions, floor drains under the cook line, and often the warewasher depending on local rules — discharge through the interceptor. Restroom and sanitary waste must bypass it. Plumbers who do not do food service regularly get this wrong, and the correction after the slab is poured is a demolition job, not a fix. Have a plumbing engineer who does restaurants stamp the waste plan.

Skipping the air balance until final inspection. The capture-and-containment test at final is where under-supplied make-up air surfaces, and by then the MAU is purchased, the curb is set, and the fix is expensive. Have the mechanical engineer size exhaust and supply together at design, require a third-party balancing report as a closeout deliverable in the contractor's scope, and hold retainage against it.

Carrying no contingency. Old buildings hide abandoned duct chases, unmarked sewer laterals, asbestos in floor mastic, and structural conditions nobody drew. Carry 10–15% contingency on the mechanical and plumbing scope specifically, on top of any general project contingency. On a $99,000 scope that is $10,000–$15,000 you will very likely spend, and the operators who survive their first buildout are the ones who budgeted it before they needed it.

Letting one contractor own the whole number. Get at least three bids from licensed mechanical and plumbing contractors who do food service specifically, and require them to bid the same engineered drawings rather than their own scope. Design-build with a single unnamed scope is how a $71,000 mechanical package becomes $95,000 in change orders, because there is no baseline to argue against.

Related questions

Does one fryer really trigger the full Type I package?

Yes. Classification is binary and driven by whether grease-laden vapor is produced, not by how much. One fryer puts you on the Type I branch with welded duct, wet-chemical suppression, and tempered make-up air — the same code path as a full broiler line.

Can I install the grease interceptor after opening?

Almost never. The pretreatment approval is typically a condition of the plumbing permit and the health department's operating permit, and the work sits under a slab or a parking field. Retrofitting after opening means closing the kitchen.

Who pays for the interceptor, landlord or tenant?

It is negotiable and worth negotiating hard. It is permanent building infrastructure that outlives your lease, so argue for base-building delivery. Failing that, ask the landlord to fund it and amortize the cost into rent rather than draining your working capital.

How long does the whole mechanical and plumbing scope take?

Plan four to eight months from lease execution to opening for a full Type I kitchen, including mechanical, plumbing, fire, and health plan review. The interceptor's right-of-way permit is frequently the longest single item on the schedule.

Is second-generation restaurant space worth the rent premium?

Usually yes for a capital-constrained operator. Inheriting a compliant hood, a sized interceptor, and adequate gas service can remove $50,000 or more from the buildout, which typically outweighs several dollars per square foot in additional rent over the term.

FAQ

What does a Type I hood cost by itself, without the rest of the system?

The canopy alone, installed, generally runs $20,000–$50,000 for a typical single-unit restaurant, driven mostly by linear feet and whether it is a wall-mounted or island configuration. That number excludes suppression, make-up air, the exhaust fan, duct, and roof work — which together usually exceed the hood itself.

Why is make-up air the line item that blows budgets?

Because people budget the exhaust and forget the supply. Every cubic foot per minute you throw out the roof has to come back in, tempered, or the space goes negative and the hood stops capturing. The unit runs $8,000–$25,000, and its gas, electrical, curb, and controls commonly add another $5,000–$15,000.

How is the grease interceptor sized?

Sizing follows the local plumbing code and pretreatment ordinance, based on the grease-bearing fixture count, drainage fixture unit load, and flow rate. Exterior gravity interceptors for a single restaurant commonly land at 1,000–2,000 gallons. The authority having jurisdiction has the final say — get the size confirmed in writing before you price the work.

What are the recurring costs after the system is installed?

Hood and duct cleaning on a frequency set by cooking volume, commonly monthly to semi-annually at a few hundred dollars per visit; interceptor pump-outs every one to three months at roughly $150–$500 per service; and suppression system inspections on a semi-annual cycle at roughly $300–$600 annually including recharges.

Can a Type II hood ever be upgraded to Type I later?

Practically, no. The duct, the shaft, the suppression system, and usually the hood itself all change, and the work sits inside finished walls and a finished roof. Converting after opening means demolition and a new permit set. Decide the classification at menu design, and if there is any chance of adding grease-producing equipment later, build for it now.

How much contingency should a first-time operator carry on this scope?

Carry 10–15% on the mechanical and plumbing scope specifically, separate from general project contingency. Old buildings hide abandoned chases, unmarked laterals, and structural conditions that were never drawn, and this is the trade where a discovery turns into a five-figure change order fastest.

Sources

• https://www.nfpa.org/codes-and-standards/nfpa-96-standard-development/96
• https://codes.iccsafe.org/content/IMC2021P1/chapter-5-exhaust-systems
• https://www.epa.gov/npdes/national-pretreatment-program
• https://www.iapmo.org/uniform-plumbing-code
• https://www.energy.gov/femp/commercial-kitchen-ventilation-systems
• https://www.rsmeans.com/
• https://www.cbre.com/insights
• https://www.us.jll.com/en/trends-and-insights
• https://www.boma.org/

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