Office Buildout Checklist: 5 Things I'd Get Right Before Your Team Moves In

If you're the person who got handed the office buildout project — not in your job description, but there it is — this checklist is for you. It's also for the operations manager, the admin coordinator, and the IT person who keeps asking questions nobody's answered yet.

I've handled purchasing for a 400-person company across 3 locations since 2020. Roughly $400K in annual spend across eight vendors, reporting to both operations and finance. We went through a full office buildout in 2024, and I made enough mistakes that you don't have to repeat.

Before the steps, two warnings: every supplier's quoted lead time is optimistic, so plan for one and a half times whatever they say. And if someone suggests 'we'll figure it out as we go,' gently remind them that the electricians are already booked.

Five steps. Do them in this order. It'll save you at least one expensive rework.

Step 1: Map Your Outlet Locations Before You Buy a Single Outlet Box

Here's what I did wrong the first time: I counted desks, multiplied by two, and ordered that many outlet boxes. Then the team kept adding equipment. New monitors. A printer nobody told me about. A coffee machine that needed its own circuit.

I under-ordered by 20 boxes. That meant a second delivery, a rescheduled electrician, and about $380 in avoidable costs.

Do it properly. Walk the floor with a printed plan. Mark every workstation, every appliance, every wall where someone might plug something in. Then add 30% for what you haven't thought of yet.

The rule I use now is simple: one duplex outlet per desk, one for every piece of shared equipment, plus 30% buffer. Our original plan called for 110 outlets; the walk-through put us at 142. The 30% buffer covered the difference exactly.

We used Southwire outlet boxes for the buildout — the model with the cubic-inch capacity stamped on the back. They're not the cheapest, but the markings made the rough-in inspection faster, and the contractor commented on it. A contractor who isn't asking me questions is a contractor finishing the job on schedule.

Honestly, I'm not sure why some suppliers charge double for the exact same Southwire outlet box. My best guess is logistics cost, not product quality. Either way, we standardized on them across all three buildings.

Checkpoint: you should be able to point at every outlet location on a floor plan before the PO goes out.

Step 2: Use Plenum-Rated Cable for Ceiling Plenum Runs — and Check the Jacket Yourself

When network cable runs through the space between the ceiling tile and the floor above — the plenum — most building codes require plenum-rated cable. Plenum cable has a low-smoke jacket that won't accelerate fire spread the way standard PVC jackets can. That's a life-safety thing, not a technical preference.

For our main office ceiling drops, we used Southwire Cat 6 plenum. The jacket has PLENUM printed along its entire length. The inspector will look for that.

Here's something vendors won't tell you: they'll sell you non-plenum cable for a plenum run without asking too many questions. It's cheaper, and it looks nearly identical until you read the jacket text.

The price difference was noticeable — about 35% more per roll than the non-plenum equivalent. It's a code issue, not a performance issue; Cat 6 is Cat 6 electrically. The jacket material is what you're paying for.

I check the jacket before accepting delivery. Not after. One pallet of riser-grade cable in place of the plenum-rated SKU would've shut us down for a week while we sent it back.

To be fair, non-plenum cable is perfectly fine inside standard drywall walls. This only matters in air-handling spaces. But nobody wants to explain to an inspector why the wrong cable ended up above the ceiling.

Step 3: Buy a Voltage Tester Before Anyone Works on a Circuit

Short one, but non-negotiable. If anyone on your team — maintenance, IT, outside contractors — is working near live wiring, someone needs to verify that circuit is dead first.

We ordered the Southwire voltage tester for our maintenance guy and the IT team. It's a non-contact tester: hold it near a wire, and it beeps and lights up if there's AC voltage. There's also a built-in flashlight, genuinely useful when you're under a desk at 4 PM.

Cost: under $30. It paid for itself within a month when our maintenance guy was about to cut wires that were still hot — despite the breaker labeled OFF. The tester caught it. Nobody got hurt.

Also worth noting: the unit runs on two AAA batteries and fits in a shirt pocket. Small enough that the maintenance guy actually carries it around instead of leaving it in a drawer somewhere.

If you're buying one, get a model with CAT III safety rating and non-contact detection. Then test it on a known-live outlet before you rely on it.

Step 4: Configure Voicemail on Every Desk Phone (Don't Assume Anyone Did It)

After our buildout, the office phones worked. Lines were active, handsets on desks, calls went through. But voicemail was not configured on a single handset. Callers got a generic message. Employees pressing the voicemail button got a mailbox-not-configured error.

The phone vendor assumed our IT provider would configure it. The IT provider assumed the phone vendor did it during installation. Classic gap.

If you're wondering how to set voicemail on phone systems like ours, here's the short version:

1. Press the voicemail button or dial the voicemail access number the provider gave you.
2. Enter your extension number, then the temporary PIN.
3. Set a new PIN, record your name for the directory, and record a personal greeting.

That's it. About five minutes per handset.

What worked for us: I printed a half-page instruction sheet, cut it into strips, and taped one to each phone. It cut the number of how-do-I-set-up-my-voicemail questions to zero within a week.

Step 5: Add a Blood Pressure Monitor to the Office (Seriously)

This one looks out of place on an electrical/IT checklist. Stay with me.

We ordered the Platinum blood pressure monitor for the break room after a few employees in their 40s and 50s mentioned their doctors had asked them to track their numbers. They didn't want to make a pharmacy trip every morning before work.

The Platinum model is simple: it measures BP, stores recent readings in memory, and prints a small paper strip with the result. No app, no account, no setup. An employee takes a reading, keeps the printout, and brings it to their doctor appointment.

It takes about 30 seconds to get a reading. Employees use it during breaks, not instead of work. Nobody's complained that it's weird or intrusive.

That was roughly $60. The goodwill is worth more than that. It tells your team you're paying attention to them, not just to network uptime.

What I'd Do Differently — and Mistakes to Avoid

When I took over purchasing in 2020, I found a vendor quoting $2,000 below our regular supply house. I ordered 40 outlet boxes and several reels of wire. The materials arrived and were installed — then the invoice came in as a handwritten receipt with no itemization.

Finance rejected it. The vendor wouldn't reissue a proper invoice. I ate $2,400 out of my department budget. Now I verify invoicing capability before placing any order with a new vendor. That's a lesson you learn exactly once.

Other things I learned the hard way:

• Don't buy the cheapest outlet boxes. A $0.50 difference per box disappears when you pay for a single rework visit.
• Don't skip the plenum label check. Right cable, wrong place. Failed inspection, long delay.
• Don't trust the breaker label. Test it. Period.
• Don't assume voicemail is handled. It isn't, until you test it on day one.
• Don't scatter purchases across ten vendors. In our 2024 vendor consolidation project, we cut six suppliers down to two. Ordering turnaround dropped from 5 days to 2 days. Invoicing errors basically disappeared. Efficiency isn't a buzzword; it's a cost saver.
• Don't pay for same-day shipping and expect same-day delivery. Two different things. We learned that on a rush order for a server rack.

Procurement pro tip: when you consolidate vendors, request line-item invoices per delivery rather than monthly statements. It makes the accounting team's audit process significantly less painful.

To be fair, I still call the local supply house when I need one roll of wire tomorrow morning. There's no substitute for that. But anything planned? Online ordering, consolidated deliveries, and standard invoicing win every time.

Bottom line: an office buildout is a coordination game. Plan the outlet layout, order the right plenum cable, buy the voltage tester, configure the voicemail, and add the little things that show people you care. Do those five steps, and you'll survive the project — your reputation and expense report intact.