Most tenants who sign a lease for a restaurant space believe they are waiting on one permit. They are waiting on two, from two agencies, with two separate sets of drawings and two separate clocks — and the one they usually forget is the one that decides whether the kitchen they drew can actually be built.
In DuPage County, a food service facility goes through a plan review at the county health department in addition to the municipal building permit. It is not a rubber stamp on the City's approval and it does not start when the City's finishes. It is its own submittal, with its own required schedules, its own review period, and its own inspections at the end — and the health department's own manual is explicit that approval of your plans is contingent upon City/Village approval, not the other way round.
We wrote about the municipal half of this in our guide to Naperville tenant build-out permits, and promised a closer look at the food service track. This is it: what the county actually asks for, what it sends back, and how to run the two reviews beside each other instead of one after the other.
Two Reviews, Two Clocks, and They Are Not Sequential
Here is the timing that decides your opening date. DuPage County's food service plan reviews typically take up to 20 business days. If the plans are not approved, an itemized list of corrections goes to you or your architect, and review of the revised set may take up to 10 additional business days.
Read that as a calendar rather than a number. Twenty business days is a month. A single correction round pushes it to six weeks before anyone has cut a stud — and that is running alongside the City's review, not after it. The tenants who lose a season are the ones who wait for the building permit to be issued before they think about the county.
Two more scheduling details from the county's manual are worth knowing before you sign anything. First, prior approval of the plans is required before any on-site construction starts; food service construction begun before final plan approval can generate unexpected costs and delays. Second, any plan review submittal older than 60 days that is still missing required documentation or fees is considered abandoned. Half-submitting to "get in the queue" does not work here — the paperwork and the fee go in together or the clock does not start.
There Is No Grandfather Clause
This is the sentence that costs people the most money, and it is stated plainly in the county's construction manual: a grandfather provision is not provided for in the DuPage County ordinance. Establishments that are newly built, remodeled, or under new ownership must meet current construction, equipment, facility and operational regulations.
So the classic plan — take over a closed restaurant, keep the kitchen exactly as it is, open in six weeks — is not a plan. The previous operator's kitchen was approved against the standards in force when it was built, and it may have drifted since. Under new ownership, it gets measured against today's standards: the hand sink locations, the finishes, the coving, the hood, the indirect waste connections, all of it.
That does not mean every takeover is a gut. It means the honest version of the budget has to be built after somebody walks the space against the current requirements, not from the listing photos. It is the same category of surprise we described in our piece on the hidden costs of remodeling, except that in food service the surprises are enforced by two agencies instead of one.
What You Actually Submit
The county wants one complete, readable set of plans. What makes food service submittals different from an ordinary tenant improvement package is the number of separate schedules that have to be in it:
- Food service equipment layout — the whole kitchen, sited
- Equipment specifications for equipment certified or classified for sanitation by NSF or equivalent
- Shop drawings for all millwork and custom-built equipment
- Finish schedule of complete interior finishes for each room — floors, walls, ceilings, countertops and coved juncture bases
- Plumbing schedule — location and size of the hot water heater, fixtures, drains and floor sinks, waste water line connections, and grease trap size and location
- Lighting schedule
- Site plan showing the dumpster and trash area, outdoor bars, patios and outdoor food operations, with every openable exterior opening identified by the type of door, window screen or air curtain serving it
Notice how much of that is millwork, finishes and plumbing — the general contractor's scope, not the equipment dealer's. A set assembled entirely from the kitchen supplier's layout will be missing the coving detail, the finish schedule and the floor sink locations, and it will come back.
The Menu Is Part of the Drawing Set
A proposed menu covering both food and beverages is a required submittal, and the county calls menu analysis a critical part of the review. The type of food, the method of preparation and the service style determine what equipment is required — which in turn determines the hood, the refrigeration, the prep sink and the ventilation.
This is the single most useful thing a first-time operator can understand early. Adding one fried item to the menu can convert your hood from a Type II to a Type I, which brings a fire suppression system, a different mechanical scope and a different fire department review with it. Menu decisions are construction decisions. Make them before the drawings are stamped, not during the build.
The layout itself is reviewed against HACCP flow: supplies, food and people should move from receiving to service without doubling back through utensil washing or restrooms. Receiving, dry storage and the walk-ins belong near the back door; prep belongs near the cook line but separate from warewashing.
Where Food Service Build-Outs Get Sent Back
Across the sets we have seen reviewed in this county, the corrections cluster in four places.
Hand sinks
Hand sinks must serve every work zone — food preparation, cooking, assembly, food and beverage dispensing, service and dishwashing — and they must be visible and within an unobstructed 25 feet of those areas. The county specifies designated wall-mounted hand sinks with a minimum 14-inch bowl width, and they may be used for nothing but handwashing. One sink can serve multiple zones, but "the prep sink is right there" is not an answer. Hand sinks are cheap on paper and expensive to add after the walls are closed and the plumbing is in the slab.
The three-compartment sink
Any facility offering open food or beverage service needs a standard NSF-approved, three-compartment, in-line sink with two integral drain boards and a minimum overall length of 84 inches — larger if the biggest item you wash demands it, and with drain boards equal in size to the bins. A convenience "C" style unit at 72 inches total length with two drain boards may substitute in limited food or beverage service operations.
Two things surprise people. A mechanical dish machine does not substitute for the three-compartment sink. And drop-in bins, built-in sinks and corner-style models do not meet the standard, however good they look in the rendering. The sink also has to be separated by walls or distance from prep, cook line and storage, with an NSF wall-hung wire shelf over or adjacent to it — so it needs real floor area allocated on the plan, not a leftover corner.
Where produce, pasta, meat or seafood is washed, thawed or cooled, a separate NSF food preparation sink with at least one bin and an integral drain board is required on top of that. Using the warewashing sink for prep will not be approved.
Finishes and coving
Finishes are where the designer's intent and the code most often collide. Walls in food prep, storage, warewashing, bars, beverage and wait stations, restrooms and janitorial areas must be smooth, durable, non-absorbent and easily cleanable — stainless steel, approved FRP, ceramic tile, or drywall painted in a quality semi-gloss or gloss. Raw or exposed wood is not acceptable, which is the note that lands hardest on the reclaimed-timber concepts. Wet zones — the three-compartment sink, mop sink, can wash, dish wash and prep sink areas — have to be finished smooth in durable waterproof material.
Ceilings under 12 feet must be smooth, durable and non-absorbent; acoustical fissured or perforated tile is not permitted in food storage, prep, service, warewashing or janitorial areas. Vinyl-faced tile or smooth painted drywall is acceptable. Floors must be commercial grade, durable, smooth, non-slip, non-absorbent, grease-resistant and easily cleanable — quarry, ceramic or porcelain tile, granite, marble, sealed concrete, terrazzo or commercial VCT. Sheet vinyl will not be approved.
Then there is coving, which fails more submittals than any other single line. A coved radius of 3/8 inch or greater with a tight seal is required at the floor-to-wall juncture, and the floor finish determines the coving material — a tile floor takes a tile cove base. Tile installed on top of tile or on wood does not meet the standard. Wait stations, buffets and salad bars need the compliant floor finish installed under them and a minimum of 3 feet beyond. Behind and adjacent to cook line equipment, stainless steel wall finishes are required unless the local fire protection district approves an alternate.
Indirect waste
Every drain line serving a dish machine, utensil or prep sink, pot and pre-rinse sink, bar sink, service sink, soda dispenser, ice machine, steam table, dipper well, tapper drip tray or walk-in condensate needs an open-site indirect waste connection with an air gap, through a floor sink or a through-the-floor hub drain. Those connections must be rigid and hard-piped — corrugated or flexible drain lines will not be approved, and a bucket under a drip line is not a connection.
Floor sinks live in the slab. If they are not on the plumbing schedule at submittal, they are a saw-cut later.
The Hood Decides Your Mechanical and Fire Scope
A Type I hood is required for commercial cooking or display equipment producing smoke, grease-laden vapors, particulate matter and odors — stoves, ranges, fryers, ovens, broilers, hot plates other than induction, and salamanders. It is defined as a stainless steel hood certified by UL, NFPA and NSF, with a fire suppression system.
A Type II hood covers equipment producing steam, mist, heat and vapors — pizza ovens, gas convection ovens, pasta cookers, conveyor ovens, bain-maries and kettles — and usually does not require fire suppression.
A separate Food Service Ventilation Plan Review Application is completed for each new exhaust system or modification, one form per hood, submitted with the exhaust plans and the specifications for the equipment going under it. The hood must be NSF approved, stainless steel, factory engineered and fully credentialed; exposed horizontal piping may not sit below the filter bank; and black iron, galvanized or painted steel hoods do not meet current standards and have to be upgraded.
That last point matters in a takeover. An older hood you inherited may look serviceable and still be unapprovable. Have it identified before you price the deal.
The Grease Interceptor Is the Sanitary District's Call
This one confuses almost everyone, because it is decided by an agency neither the City nor the county controls. The local sanitary district determines the number and size of grease traps, interceptors or basins. If one is required, it is either an exterior grease basin or an interior interceptor recessed into the floor so the lid sits flush, with a minimum 3-inch inlet and outlet.
Two practical constraints follow. The interceptor has to be genuinely accessible for maintenance, and it must be located so it does not interfere with the legs of the three-compartment sink or other fixed equipment. On a tight kitchen footprint, that decision cascades into the whole layout — which is why the interceptor size and location are a required line on the plumbing schedule rather than a field decision.
Call the sanitary district that serves the address early. It is usually a short conversation and it occasionally changes where the kitchen can go.
Plumbing and Equipment Details Trades Assume
A few standards catch experienced commercial trades who do not work in food service every week:
- A 40-gallon commercial gas water heater is the minimum standard. If it is suspended, the support shelf must give a minimum 80 inches of clearance above the finished floor. Tankless systems must be NSF approved.
- All sewage must discharge to a public sewer — private sewage disposal systems are not permitted for food service. Underground waste piping follows the state plumbing code at a minimum 3 inches in diameter.
- Unprotected sewer, water and roof drain lines may not run directly above food prep, display, storage or warewashing areas.
- Table-mounted equipment goes on 4-inch legs unless it is genuinely portable — under 75 pounds with no rigid utility connections. Floor-mounted equipment goes on casters or 6-inch legs, and casters are required for cooking equipment under the hood. Curbs and raised platforms for cook line equipment are not approved, and equipment may not be sealed to the floor or counter.
- Exposed utility lines stay at least 6 inches off the floor and half an inch off the wall; electrical in grease, high-moisture or splash zones must be commercial-grade liquid-tight; gas connections use NSF poly-vinyl coated lines with quick disconnects.
- Work and prep surfaces must be NSF stainless or NSF Standard 51 material, with a minimum of four linear feet provided. Painted, galvanized, tiled, wood and laminate surfaces do not qualify.
Millwork, Lighting and the Front of House
Custom cabinetry is reviewed too, and shop drawings are a required submittal. Countertops must be smooth, durable solid-surface material meeting NSF Standard 51 — stainless, granite, quartz, engineered stone, sealed concrete and similar. Laminate and unfinished wood are not permitted in food and beverage storage and service areas, bars, wait stations, buffets, salad bars or restroom millwork. Base cabinetry needs an open-to-floor design with 6-inch stainless steel legs or a toe kick removable without tools.
Lighting above food storage, prep, service, display and warewashing must be shielded or shatter-resistant — and that includes inside refrigerators and display cases, at bar equipment, at coffee, soda and condiment stations, and under the vent hoods. Track, can and pendant fixtures have to fully encase the bulb, which is worth telling the lighting designer before the schedule is issued rather than after.
Dining room finishes are generally not regulated, with an important exception: anywhere splash and moisture are likely — bars, beverage areas, salad bars, buffets and server stations — the kitchen finish standards apply. That boundary is exactly where a beautiful front-of-house design meets a correction letter, and it is the sort of detail we resolve at drawing stage on restaurant and hospitality build-outs.
One jurisdictional note worth carrying: the health department states plainly that it has no enforcement authority over ADA regulations and directs you to the local building department for those requirements. Accessible restrooms, clearances and the path of travel are the City's review, not the county's — a separate obligation we covered in detail in our guide to accessibility on an Illinois commercial build-out, and part of the scope on ADA compliance work.
The Outside of the Building Counts
Two things regularly get missed because they are not on the floor plan.
Garbage. Interior garbage storage areas are not approved. Dumpsters, containers, compactors and grease containers go outside, as far as practical from the building's doors and windows, and they must sit on a smooth surface such as concrete or machine-laid asphalt — grass and gravel will not be approved. Grease containers should be on casters. Compactors are outside; a baler may be inside but not in a food service area. Your municipality may have its own enclosure requirements on top of that.
Openings. Every exterior opening needs an effective barrier against insects, rodents and birds: tight-fitting self-closing doors with sweeps, fixed or self-closing screens of #16 mesh or finer, or an approved air curtain on an automatic door-activated switch. Roller doors, sliding or bi-fold windows and movable wall systems that create a continuous opening to the exterior require an approved air curtain across the entire opening. If your concept includes a garage-door window wall onto the patio, that is a mechanical line item, and it belongs in the budget from day one.
Inspections, the 72-Hour Rule, and Who Lets You Open
Three site inspections sit at the end of the county's process: a plumbing location inspection (recommended, to verify underground plumbing and the location of fixtures and drains), a pre-operational inspection when the facility is roughly 90 percent complete with equipment and fixtures in place, and a final inspection that closes out the pre-operational items and issues the operating permit.
All inspections require 72-hour notice to schedule. On a build with a hard opening date and a staff already hired, three days is not a rounding error — it is the difference between a Friday opening and the following Wednesday.
And the last gate is a joint one: opening approval is contingent on the approval of City or Village building, plumbing, fire and municipal officials as well as the county. Separately, proof of ANSI-approved Certified Food Protection Manager certification for the person in charge is required before the permit is issued and before you open, and the person in charge on every shift must hold it. That is a training lead time, not a construction one — start it early.
How This Runs in Naperville
On the municipal side, Naperville issues a Tenant Build-Out Permit for businesses modifying the interior or exterior of a space, and a Business Occupancy Permit where a new business, name change or ownership change involves no modification. Minor updates such as painting and new carpet do not require a permit — but a restaurant build-out is never that.
Start at the City's pre-application open house, held Tuesday mornings from 8:30 to 9:30 a.m. at the Naperville Municipal Center, where staff from Building, Planning and Zoning, Fire and the Electric Utility take questions in one room. Bring drawings and a completed Letter of Intent for Business Occupancies. For a food concept, that hour is worth a fortnight of email — the fire representative alone will tell you what your hood and suppression scope looks like.
Applications are filed through the City's Civic Access portal. The permit desk is the TED Business Group at (630) 420-6100, Monday through Friday, 9 a.m. to 4 p.m. And note the code package: under the ordinance passed by the City Council in February 2026, permits submitted on or after April 1, 2026 are reviewed against the 2024 ICC family of codes. A drawing set produced from an older template will collect comments on that alone.
On the county side, the plan review application is submitted online through the health department's portal, and the food program's plan review staff can be reached at 630-221-7045. Talking to them during design — particularly about air curtains and anything unusual in the layout — is invited and it is free.
What It Costs and How Long It Takes
Restaurant build-outs are among the most expensive commercial construction projects: typically $150 to $350+ per square foot all-in including kitchen equipment, which puts a 2,500-square-foot fast casual build-out in the $250,000 to $500,000 range depending on kitchen complexity and finish level. We provide detailed construction estimates, excluding equipment, once we have reviewed your plans.
On schedule, most restaurant build-outs take 12 to 24 weeks from permit approval, depending on size and complexity. Health department plan review and fire marshal review sit in front of that, which is exactly why we start those submissions as early as the drawings allow.
The health department's plan review fee is tiered by review type and adjusted annually, so price it off the current published schedule rather than a number a friend paid two years ago. It is a small figure against the build — the expensive part is never the fee, it is the six weeks a correction round costs when the lease is already running.
Outside DuPage: Will and Kane
Naperville straddles a county line, and the rest of our market crosses several. In Will County — Plainfield, Romeoville, Joliet — food service plan review runs through the Will County Health Department's Division of Environmental Health, with its own checklist and its own fee, and a proposal must be submitted before constructing or remodeling. Kane County communities including Geneva, Batavia and St. Charles have their own arrangements; the City of Geneva Building Division can be reached at (630) 232-0032.
The pattern holds everywhere: a municipal building permit plus a county food service review, both of which can be started the week the lease is signed. Our DuPage and Will County permit guide covers the municipal side across project types, our Naperville page lays out how we work in this market, and the locations directory covers the rest of the towns we build in.
A Sequence That Works
- Finalize the menu before the drawings are stamped — it sets the hood, the refrigeration and the prep sinks
- Call the local sanitary district about the grease interceptor before the kitchen layout is fixed
- Take the space to the City's Tuesday open house with drawings in hand
- Submit to the City and the county in the same week, not in sequence
- Make sure the set includes the finish schedule, the coving detail, the floor sinks and the millwork shop drawings — not just the equipment layout
- Budget a correction round: 20 business days plus 10 more is the realistic front end
- File a ventilation plan review application for each hood
- Start Certified Food Protection Manager certification during construction, not after
- Build 72-hour inspection notice into the closeout schedule
- On a takeover, price the space against today's standards — there is no grandfather clause
None of this is exotic. It is a long list of specific requirements that reward being read early, and the projects that open on time in this county are almost always the ones where somebody walked the space with the manual open before the lease was signed. We have taken commercial spaces from empty shell to finished operation across this market — our MRG build-out in Naperville is one example of what a fully custom commercial interior involves — and the pattern never changes: the schedule is decided in the first three weeks, not the last three.
Frequently Asked Questions
Do I need health department approval before construction starts?
Yes. DuPage County requires prior approval of the plans before any on-site food service construction begins, and warns that starting before final plan approval can produce unexpected costs and delays. Plan review typically takes up to 20 business days, and review of a revised set can take up to 10 additional business days. Health department approval is also contingent on City or Village approval, so both submittals should go in together.
I'm taking over a closed restaurant. Can I open with the kitchen as-is?
Usually not without work. The DuPage County ordinance provides no grandfather clause: establishments that are newly built, remodeled or under new ownership must meet current construction, equipment, facility and operational regulations. A kitchen approved a decade ago may not meet today's requirements for hand sink placement, finishes, coving, hood type or indirect waste connections. Have the space walked against the current standards before you price the deal.
What's the difference between a Type I and a Type II hood?
A Type I hood is required for equipment producing smoke, grease-laden vapors, particulate matter and odors — ranges, fryers, broilers, ovens, hot plates other than induction, and salamanders — and it is a stainless steel hood certified by UL, NFPA and NSF with a fire suppression system. A Type II hood covers equipment producing steam, mist, heat and vapors, such as pizza ovens, gas convection ovens, pasta cookers and kettles, and usually does not require suppression. A separate ventilation plan review application is filed for each hood.
Who decides the size of my grease interceptor?
The local sanitary district, not the health department and not the City. If an interceptor is required, it is either an exterior grease basin or an interior unit recessed into the floor with the lid flush and a minimum 3-inch inlet and outlet. It has to be accessible for maintenance and positioned so it does not interfere with the legs of the three-compartment sink or other fixed equipment, so ask the district early — the answer can change the kitchen layout.
Can a commercial dishwasher replace the three-compartment sink?
No. A mechanical dish machine may not be substituted for a three-compartment sink. Any facility offering open food or beverage service needs a standard NSF-approved, in-line three-compartment sink with two integral drain boards, at a minimum overall length of 84 inches — or a 72-inch "C" style unit in limited food or beverage service operations. Drop-in bins, built-in sinks and corner-style models do not meet the standard.
Have a question we haven't covered? Our remodeling FAQ page answers the broader set, or send us the floor plan and your menu and we'll tell you what the two reviews are likely to ask for before you sign the lease.