Structured cabling and low-voltage installation in Chicago
Cablify installs network cabling, fiber, security cameras, access control and Wi-Fi in Chicago and the suburbs, from Loop towers and Fulton Market offices to data centers in Elk Grove Village and warehouses along I-55 and I-80.
- Plenum ceilings
- Cable runs in metal raceway
- City permit
- Low voltage/communication permit
- Licensing
- City electrical license, IDFPR for alarm work
- Suburbs
- Each sets its own rules
Chicago’s plenum rule changes the job
In most of the country, plenum-rated cable can run open above a return-air ceiling. The Chicago Electrical Code limits wiring in those spaces to metal raceway, such as EMT with compression fittings, or to metal-sheathed cable. Communications cable of every rating has to be inside that raceway.
Risers have their own rules. Plenum and riser-rated cable can run up through floors with firestops at each level, while lower-rated cable needs metal raceway or a fireproof shaft. Fire alarm conductors run in their own dedicated metal raceway.
Before we price a Chicago job, we confirm which ceilings are plenums, because that decides how much raceway the job needs.
Example
Open office under a return-air ceiling
- Most U.S. cities
- Plenum-rated cable supported on J-hooks above the ceiling
- Chicago
- Cable inside metal raceway through the whole plenum space, from the telecom room to each work area
- What changes
- More material and labor for raceway, and pathways planned before the ceiling grid goes in
An illustration, not a design. The building, the ceiling type and the drawings decide the method.
Licensing and permits
Chicago treats low-voltage wiring as electrical work. The suburbs each write their own rules.
City electrical contractor license
Contractors working in Chicago hold a General or a Low Voltage electrical contractor license from the Department of Buildings and employ a licensed supervising electrician.
Low voltage permit
Communications and other low-voltage jobs are filed under a low voltage/communication permit, which cannot include any line-voltage work.
Cameras, access control and alarms
Illinois licenses private alarm contractors through IDFPR, and the state’s definition of an alarm system includes access control and security video. Licensed alarm contractors can register with the city to pull alarm permits.
Suburbs
Naperville, for example, requires a permit and a city-registered electrical contractor for security and office data systems over 25 volts or 50 watts. We check the rules in each village before we quote.
Chicagoland by district
CBRE counted 910.6 MW of data center inventory in Chicago in the first half of 2026, one of the largest markets in North America. Offices and warehouses keep the rest of the metro busy.
The Loop and River North
Office towers where occupancy rose above 2024 levels in early 2026. Most jobs are tenant fit-outs and floor-by-floor upgrades in occupied buildings.
Fulton Market and West Loop
Converted warehouses and new office buildings, including McDonald’s global headquarters, with exposed ceilings that put pathways on show.
350 East Cermak
One of the most interconnected data centers in the Midwest, with more than a million square feet and over 70 network providers.
Elk Grove Village and O’Hare
A business park of about six square miles beside the airport, with around 20 data centers and more planned.
Oak Brook, Naperville and Schaumburg
Suburban office campuses and corporate headquarters along I-88 and I-90, including Zurich North America and Motorola Solutions.
Joliet and Elwood
The CenterPoint Intermodal Center at I-55 and I-80, with rail terminals and about 17 million square feet of warehouses.
Built for a Chicago January
The National Weather Service puts Chicago’s normal January low at 18.8°F, and the city’s record low is -27°F from January 1985. Snowfall averages about 38 inches a year.
- Outdoor cameras and housings specified for the cold, with heaters where the site needs them
- Exterior conduit sealed so meltwater does not follow the cable inside
- Rooftop and parking deck work scheduled around the weather, not left to the last week
- Batteries for door controllers and recorders kept inside heated space
Common questions
Why does Chicago cabling cost more in some buildings?
Because the Chicago Electrical Code requires metal raceway for cable in plenum ceilings. Where the ceiling is a return-air plenum, raceway adds material and labor. Ceilings that are not plenums can use standard supports.
Do you work in the suburbs?
Yes. Our Chicago market covers the metro area, including Naperville, Schaumburg, Oak Brook, Elk Grove Village, Elgin and Joliet. Each suburb has its own permit rules, and we confirm them per site.
Can you install cameras that work through winter?
Yes. We specify cameras and housings rated for the cold, add heaters where needed, and mount them so snow and ice do not block the view.
Do you work in data centers?
We install fiber trunks, racks, ladder rack and patch fields in data rooms and colocation suites, and follow the operator’s rules for access and labeling.
Request a quote in Chicago
Send the address, building type and what you need installed. Tell us if you know whether the ceiling is a plenum.