Structured Cabling for a New Build: What the GC Wishes IT Told Them Sooner

Every other trade on the job has a plan set. The electrician has panel schedules and a lighting layout; the mechanical contractor has ductwork drawings. Low voltage often shows up as a single line on a note that says “data by others.” That gap is where budgets blow up, because the cabling crew needs the same three things everyone else needs: a route through the building, a home for the equipment, and a sequence that lets them work before the walls close.

Getting a cabling partner into the design conversation early does not mean more meetings. It means one walkthrough of the floor plan to mark drop locations, one decision about where the telecom room lives, and one agreement about who is stubbing conduit. That hour saves days later.

1. Drop count and locations

A “drop” is a cabling run to a specific spot — a desk, a wall-mounted display, a camera, a wireless access point. You want them placed against how the space will actually be used, not where the furniture happens to sit on move-in day. Under-provisioning is the classic mistake: it is cheap to pull an extra pair of cables to a wall during rough-in and expensive to add one after the tenant is in. For wireless access points, those locations should come from a predictive WiFi survey done before the ceiling grid goes in.

2. Pathways and the ceiling

Cable needs a legal path: cable tray, J-hooks, conduit sleeves through fire-rated walls, and stub-ups from the telecom room. Where cable crosses a rated wall or floor, the penetration has to be firestopped to preserve the rating. None of this can be improvised after the ceiling is closed.

3. The telecom room (the IDF)

Racks and switches need a real home — a room or closet with dedicated power, enough cooling to handle the heat the gear throws off, and a plywood backboard on the wall. A common oversight is a data closet with a single outlet and no ventilation. Decide its location early, because every cable run measures back to it.

4. Cable category and the 90-meter rule

Copper structured cabling follows the ANSI/TIA-568 standard, which caps a permanent cable run at 90 meters (about 295 feet), with a total channel of 100 meters once you add patch cords at each end. If a corner of the building sits farther than that from the telecom room, you either add a second room or plan a fiber backbone. For new construction, Category 6A is the sensible default: it carries 10-Gigabit Ethernet across the full 100-meter channel, where standard Cat6 only reaches 10G for roughly the first 55 meters. Pulling 6A now is cheaper than opening the ceiling again in five years.

5. Plenum versus riser

If the ceiling space is used to return air to the HVAC system — a “plenum” ceiling, which is common in commercial buildings — code requires plenum-rated cable, which resists flame spread and low smoke. It costs more than riser cable, and inspectors check for it. Guessing wrong means pulling it all out.

Cabling happens in the same three beats as the rest of the job. Rough-in is pulling cable through open framing and ceilings before insulation and drywall. Trim is terminating jacks, mounting racks, and dressing the runs once devices and the ceiling grid are in. Finish is testing, labeling, and handing over documentation. Miss the rough-in window and every later step gets harder and more expensive. We break the sequencing down in data and telecom rough-in on a construction schedule.

The same pathways that carry your data also feed the cameras, the card readers, the paging speakers, and the conference-room displays. Planning those systems together means the ceiling is opened once, the labeling is consistent, and nobody discovers a pathway conflict after the drywall is up. That is the argument for treating structured cabling, physical security, and audio/video as one physical-layer scope rather than three separate afterthoughts. Sorting out the line between the low-voltage crew and the electrician early avoids the most common change orders — we cover that in low voltage versus the electrician.

When should structured cabling be planned on a new build?

During design, alongside the electrical and mechanical drawings. The cabling crew needs to mark drop locations, agree on pathways, and set the telecom room before framing closes. Bringing them in at that stage costs almost nothing; bringing them in after drywall means cutting into finished walls.

What is the maximum length for a network cable run?

Under the ANSI/TIA-568 standard, a permanent copper run is capped at 90 meters (about 295 feet), with a 100-meter total channel including patch cords. Distances beyond that call for a second telecom room or a fiber backbone.

Should a new office use Cat6 or Cat6A cabling?

For most new construction, Category 6A is the better long-term choice because it supports 10-Gigabit Ethernet across the full 100-meter channel, while Cat6 reaches 10G only for roughly the first 55 meters. The material cost difference is small compared with the cost of re-cabling later.

Who is responsible for the cabling pathways — the GC or the cabling contractor?

That should be spelled out in the scope before the bid. Often the electrician stubs conduit through rated walls and the low-voltage contractor runs the cable and installs J-hooks or tray. Agreeing on this in advance prevents the most common source of change orders.

Planning a build or a tenant improvement in Texas? Our team can review the floor plan and mark up a cabling plan before the walls close. See structured cabling services, explore the full network technology practice, or call our Houston office at 713-571-2390. We work with construction and general contracting firms across Texas.