Cabling and IT support from one company: why it matters for a build-out

Yes, one company can do both the cabling and the IT setup. I do, in Dallas

If you are building out a new office in Dallas and want the cabling and the IT setup from one company, that is exactly how I work. I run the Cat6 from the IT room to every desk, printer, phone and access point, terminate and test it, install the rack and patch panel, configure the switch, firewall and Wi-Fi, coordinate the internet circuit, set up the computers and phones, and then support the office after you move in. One company, one quote, one phone number, and me as your contact throughout.

Most businesses do not get it that way, and not because they chose otherwise. The general contractor hires a low-voltage subcontractor for the cable as part of the construction, the business hires an IT company for the computers, and the two never meet. The cabler finishes and leaves before the IT company arrives. Whatever falls in the gap between them, and something always does, becomes your problem to sort out on move-in week.

This article explains what that gap looks like in practice, what changes when the same person does both jobs, how a build-out runs when it is planned that way, and where the limits of a small company are. If you would rather skip straight to a conversation about your space, send me the floor plan.

Why cabling and IT usually come from two different companies

The split is a habit of the construction industry, not a rule about what is best for the tenant. Office build-outs are organized by trade. The general contractor brings in framers, electricians, HVAC, painters, and a low-voltage contractor for anything that carries signal rather than power: data cable, phone cable, sometimes cameras and door access. The low-voltage contractor's job ends at the patch panel. Nobody on the construction side is responsible for the switch, the firewall, the Wi-Fi settings, the computers or the phone system.

Meanwhile, the business hires an IT company, usually later, once the lease is signed and the move date is real. The IT company arrives to a finished space with a rack full of cables it did not run, labeled in a scheme it did not choose, tested by someone who is no longer on site, with drops in the places the architect guessed rather than the places the desks ended up.

Both companies did their jobs. Neither of them owned the result, which is an office where everyone can sit down and work. That ownership is the thing you are actually buying, and it is what gets lost when the work is split by trade. I go into who does what in more detail in low-voltage contractor or IT company: who should run your cable?

What finger-pointing actually looks like on move-in day

Here is a scene I have walked into more than once. It is the first Monday in the new office. Three desks in the back have no network. The office manager calls the IT company. The IT company checks the switch, sees the ports are configured correctly, and says the cable must be bad. The office manager calls the cabling company. The cabling company says every run tested fine on the day and the IT company must have patched it wrong. Each is willing to send someone out, at a charge, to prove it is the other's fault.

The real cause is usually small: a patch cord in the wrong port because the panel labels did not match the wall labels, a drop that landed in a different office than the plan showed because a wall moved during construction, a jack that was punched down in the wrong wiring order, or a desk that was placed where there is simply no drop and nobody noticed until the furniture arrived.

None of that is hard to fix. What is hard is finding out which one it is when the person who knows the cable and the person who knows the network have never spoken. You pay two trip charges, lose a day or two of three people's work, and still end up with the answer "it was a bit of both". When the same company did both jobs, the same call ends with me walking to the rack, looking at the labels, and fixing it.

What changes when the same company does the cable and the network

The difference is not only fewer phone calls. The whole project is designed differently when the same person will run the cable and then live with the network that runs on it. Specifically:

• The drop count is designed around real equipment. I know which desks get a phone, where the printers will actually sit, how many access points the space needs and where the cameras go, so the drops go to those places instead of a generic two-per-room guess.
• The IT room is placed for the network, not for the leftover closet. Central location, dedicated power, airflow, a lockable door, and the internet provider's entry point all considered together.
• The cable is tested against the equipment it will serve. Not just "passes", but "this run powers that access point and this desk gets gigabit".
• Labels follow one scheme from the wall jack to the panel to the switch port to the documentation you receive.
• One quote and one schedule. Cabling, rack, equipment, internet coordination, computers and phones on one sheet, with the dates lined up against the construction milestones.
• One number to call afterwards, mine, and I already know every run in the ceiling, so future changes are quick.

The practical result is an office that works the first morning. The commercial result is that you are not paying two companies to overlap on the same job or to argue over the seam between them.

How a build-out plus IT setup runs, stage by stage

A new office is built in a sequence, and cabling has to happen at particular points in that sequence or it gets much more expensive. Here is how I fit the IT work into a typical Dallas tenant build-out, so you can see where each piece lands.

The two lines that catch people out are the first and the second. The internet circuit needs to be ordered as soon as the lease is signed, because the provider's install date is often the longest lead time on the whole project; see getting internet into a new office. And the cable needs to go in while the walls are open, which means the IT person has to be on the project before framing, not after paint. If you bring me in at the plan stage, both of those take care of themselves.

What you receive at the end

A build-out done as one project ends with a handover, not just a working office. When I finish, you have:

1. A labeled port map: every wall jack, its panel port, its switch port and what is plugged into it.
2. Test results for every cable run.
3. A floor plan marked with access point locations and the IT room layout.
4. An equipment list with model numbers, serial numbers and where each item lives in the rack.
5. All the logins: firewall, switch, access points, internet provider account, phone system, stored where you control them.
6. A short written summary of how the network is built: the staff, guest and device networks, what the firewall allows, and how the backup power is arranged.

This is the paperwork that a two-vendor project rarely produces, because each vendor documents only its own half and neither documents the joins. It is also what protects you if you ever decide to move on from me: the next person can pick up the office from the documents instead of from scratch. I would rather keep clients by being good to work with than by being the only one who knows where the cables go.

What a small company cannot do, and how I handle it

I want to be straight about the limits, because "one company for everything" can be oversold. Cross River Tech is a small company, and there are parts of a build-out that are not mine:

• Electrical. The dedicated circuit for the IT room and the outlets at the desks are the electrician's job. I tell the general contractor what I need and where.
• Fire alarm and life-safety systems. These are specialist, regulated trades. I do not touch them.
• Very large jobs. A multi-floor build-out with several hundred drops on a tight construction schedule needs a crew. On a project that size I am the better fit as the IT lead who designs the network and manages the cabling contractor, rather than the person pulling every cable.
• Security cameras and door access. I run the cable for them and put them on the right network. The hardware itself often comes from a security vendor, and I coordinate with them.

For the typical Dallas professional office, from a solo practice to a suite of a few dozen people, the whole cabling and IT job is a comfortable fit for my company working with the general contractor's schedule. Above that, I still keep the design and the support in one place, and I bring in the extra hands for the pull. Either way you get one owner who is responsible for the outcome, and that is me.

How to set this up with your landlord and general contractor

Because the construction process defaults to a separate low-voltage subcontractor, you usually have to ask for the arrangement you want. Three things make it easy:

1. Tell the general contractor early that data cabling is being handled by your IT provider and should be carved out of their scope. Most are glad to remove it, because it is a coordination headache for them. Ask them to leave the ceiling open in the IT room and along the main cable path until the cable is in.
2. Check the tenant improvement allowance. Many Dallas leases include an allowance from the landlord for build-out costs, and data cabling is often an eligible item. Ask the landlord's representative whether cabling done by your own vendor qualifies; it usually does if it is invoiced and documented properly.
3. Ask about building rules. Some buildings require after-hours work, specific paperwork, escorted access or particular firestopping for penetrations. I handle all of that, but I need to know in advance.

If you are moving from an existing office rather than starting fresh, the same conversation applies, with the added job of disconnecting and moving what you already have. Office move and new office IT setup covers that side, and the office move IT checklist gives you the full timeline.

After move-in: support from the person who ran the cable

The last reason to have the same company do both halves shows up months after the build-out. Offices change. Someone joins and needs a desk where there was a plant. The printer moves. A conference room becomes two offices. A new phone system arrives. Each of those touches both the cable and the network, and each is a quick job for the person who ran the cable and a slow one for anyone else.

When you keep me on for ongoing support, I already know which panel ports are spare, which wall jacks are live, where the access points are and what the firewall allows. Most day-to-day requests are handled remotely because the network was built to be managed remotely, and when something needs hands on site, I am the one who shows up, not a technician reading a ticket about a building they have never seen.

That continuity is the whole argument in one sentence: the person who designed the office network, ran its cable and configured its equipment is the best person to support it, and in Dallas you can have that person be one individual you know by name. If you are planning a build-out, or you are in one now and the cabling question has just come up, get in touch and I will walk the space or read the plans and give you a single written quote for all of it.

Questions people ask

Written and reviewed by

Anthony Omini, founder of Cross River Tech

Over 15 years in IT across many industries, now running Cross River Tech, a small owner-led managed IT company in Dallas. Every article is written from his own client work and checked by him before it is published.

Building out an office in Dallas? Send me the plans and the move-in date. I will quote the cabling, the IT room, the network and the computers on one sheet, with me responsible for all of it.

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