Every commercial building has an electrical design drawn up before the first brick is laid. The data network rarely gets the same care — it becomes an afterthought, solved with whatever space is left above the ceiling. Brazil's own standard for this work, NBR 14565, sets out how to design, install, verify, and maintain the physical network of a commercial building: from the outlet on the desk to the equipment room, through cable routes, wireless access points, and the hierarchical star topology that ties it all together.
Cabling is not an afterthought item on a construction punch list: it's the layer that carries phone lines, data, cameras, and, increasingly, power for the network equipment itself. Decided on the blueprint, it's one line in the renovation budget. Decided afterward, with the wall already closed and the business already running, it usually turns into a whole extra job.
For whoever signs off on the budget, the decision that matters isn't technical — it's timing. Decided on the blueprint, cabling is a project. Decided after the move, it's a repair — and network repairs carry a specific side effect: the intermittent failure nobody can explain.
The cost of pulling cable later
It's a familiar scene for any company that has moved offices in a hurry: the move-in date is set, the new building is done on the construction side, and the network becomes the last item on the list. Someone runs cable over an already-closed ceiling, splices it in the middle of a hallway because the right route was never planned, and creates a network point wherever there's room — not where operations actually need it.
TechLink Services, a corporate cabling specialist, publishes budgeting reference ranges drawn from its own project experience: cabling decided during new construction costs 20% to 40% less per network point than the same work done later, as a retrofit. The reason is physical: with walls and ceilings still open, the cable route is planned alongside the rest of the build; in an occupied building, the installer faces a closed rigid ceiling, space already taken by other systems, and access restricted to hours that don't disrupt the business.
The same reference points to a second, less predictable effect: scope-change requests mid-project — discovering, once work is underway, that the planned route doesn't fit or a point is missing — run 10% to 30% over the original budget when cabling is decided in an already-occupied building. In new construction, planned from the blueprint, that overrun stays between 0% and 5%. That's the difference between a budget that holds and one that grows on its own every week of construction.
CommScope, a leading network infrastructure manufacturer, sums up why this rework rarely pays off: ripping out cabling that's already installed and replacing it with something more capable is almost never feasible or cost-effective once the business is up and running. In practice, the company lives with the network the rush left behind for years, only reopening walls once the pain becomes too big to postpone.
That rework is what shows up months later as the problem nobody can name: a computer that drops on its own, a network point that works fine at one desk and fails at the next, a support ticket closed with no root cause found because the cable that needed testing sits inside an already-painted wall.
Why the usual approach doesn't work
The usual approach isn't a failure of whoever runs the construction job — it's the absence of a cabling design on the renovation's list of plans. Electrical work has a design, HVAC has a design, the data network doesn't: someone "handles it" later, with whatever budget is left and a deadline that's already blown.
Without a design, every decision becomes individual improvisation. The electrician runs cable through whatever route is open that day, not the one that will support the next wireless access point. The network point lands wherever an electrical outlet already existed, not where the desk will actually be. And because there's no record of which cable goes where, any future change — moving a desk, adding an access point — means opening the ceiling and tracing cable by hand until the other end turns up.
The most expensive result of this improvisation isn't visible on move-in day: it shows up when the company tries to use real Wi-Fi. A Wi-Fi 6E access point needs, according to EdTech Magazine, at least two Category 6A cable runs, with four recommended — because the device carries more than one radio, each needing its own data capacity and power over the cable. For Wi-Fi 7, according to technical material from AnD Cable Products on wireless infrastructure, the market standard is two to four Category 6A runs per access point, for the same reason. A network pulled with one cable per point, in whatever category the installer had in stock, can't support that standard — and the practical effect is Wi-Fi that drops exactly where traffic is heaviest.
What has to be in place
A properly decided cabling job is recognized by concrete, verifiable mechanisms on the blueprint before construction closes up — not by a promise of quality.
A cabling design on the same blueprint as the electrical design. Cable routes, the position of every network point, and the location of every wireless access point go into the building's design before the walls close, not after the ceiling is already finished.
Cable sized for the Wi-Fi the company will actually use, not for whatever's in stock. Two to four Category 6A cables per access point, matched to the wireless standard the company plans to use, avoid a return trip when the next access point arrives.
Power-over-cable capacity built into the design from the start. Access points, cameras, and network phones increasingly draw power through the data cable — and that electrical load needs to be part of the plan, not discovered after the device won't turn on.
Identification and documentation of every network point. Every cable labeled on both ends and logged on a network map, so any future change starts with the blueprint, not a manual search behind the ceiling.
Room to grow without reopening a wall. Cable routes and rack capacity planned with spare room — moving a desk or adding a workstation shouldn't turn into a construction job.
One party responsible from design through installation and final testing. Someone who owns the network end to end, instead of an electrician who hands off the cable and a network technician who only shows up later to figure out what was done. This is how Skills IT works: the cabling design enters the conversation before construction closes, with every point documented and room built in for the growth the company already knows is coming.
What the company gains
The most direct gain is not paying twice for the same network. Decided on the blueprint, it's one line in the construction budget; decided later, it's a new job, a reopened ceiling, and production stalled during the work.
There's a second gain, less visible but costlier day to day: the end of unexplained failures. A documented network, with every cable identified and tested at handover, turns "the computer keeps dropping" into a ticket with a traceable cause — the technician follows the map to the right point instead of suspecting everything at once. Less staff time lost waiting for the problem to be found, fewer tickets reopened for the same unresolved cause.
The third gain is decision-making with real information. A company that knows exactly how many network points it has, where they are, and how much capacity is left can plan its next hire, its next workstation, or its next camera without depending on a technician opening the ceiling to find out what's already there.
A checklist for before construction closes
Before signing off on the renovation or move-in blueprint, it's worth bringing this checklist to the meeting with the engineer or construction manager:
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Ask for the cabling design alongside the electrical design, not after it. If the data network isn't on the same blueprint, it still has no defined route — and one will get improvised once construction is already underway.
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Define how many cables go to each wireless access point, not just how many network outlets exist. A Wi-Fi 6E or Wi-Fi 7 access point needs more than one cable; counting only desk outlets undersizes the design.
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Confirm the design already accounts for power over the network cable for the access points, cameras, and phones that will use it — finding out about this need after the equipment arrives means an extra job.
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Ask for identification and a map of every point before the ceiling closes. Without it, every future repair starts with someone tracing cable by hand.
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Reserve capacity beyond what move-in day requires. Spare room in the rack and conduit costs little now and avoids new construction once the company grows.
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Put in writing who owns the network from design through final testing. A cabling project with no single owner almost always ends with nobody able to explain why one specific point doesn't work.
