How to Set Up Wi-Fi for a Small Office (10–50 People)

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Small offices usually start with the internet provider’s router and a couple of cheap extenders. It works for five people. At fifteen, calls start breaking up, the printer disappears, and someone says “the internet is slow again.” This guide explains how to set up Wi-Fi for a small office of about 10 to 50 people the right way, without enterprise prices.

The short version

1. Stop using the ISP router for Wi-Fi. Use it only as a modem (bridge mode) or turn its Wi-Fi off.
2. Get a proper router/firewall that you control.
3. Use ceiling or wall access points connected by cable, not extenders and not home mesh.
4. Cable every desk that doesn’t move. Wi-Fi is for laptops and phones.
5. Separate networks for staff, guests, and devices like printers and cameras.
6. Give voice calls priority if the office uses VoIP phones or softphones.

Step 1: Plan before you buy

Walk around the office with a floor plan and note:

• How many people and devices. Count about 2–3 devices per person (laptop, phone, sometimes a tablet or headset base).
• Where people actually sit. Access points go above the areas where people work, not in the corridor or the server cupboard.
• Walls. Concrete, brick and glass with metal coating block signal. Plasterboard is mostly fine.
• Where cables can run. False ceilings make life easy. Without them, plan cable trunking early.

A rough rule for open-plan offices: one access point per 15–25 active users, or one per room if the walls are heavy. It is better to have more access points running at lower power than one very powerful one.

Step 2: Choose the router (the “brain”)

The router connects the office to the internet, hands out addresses, separates the networks and runs the firewall. For small offices, look for:

• VLAN support (to separate staff, guest and device networks)
• Traffic prioritization (QoS) for voice
• VPN support for remote staff
• Regular firmware updates
• Gigabit or 2.5G ports

Good examples of this class:

• MikroTik RB5009 — very powerful for the price and extremely flexible. The trade-off is that it needs someone who knows networking to set it up. This is the kind of equipment I use at work. Check price on Amazon
• Ubiquiti UniFi Cloud Gateway — easier, with a clean management app, and pairs with UniFi access points. Check price on Amazon
• TP-Link Omada ER-series router — budget-friendly and managed from the same controller as Omada access points. Check price on Amazon

My advice: if nobody in the office knows networking, choose UniFi or Omada. The management app will save you more time than the price difference. If you have an IT person, MikroTik gives the most control for the money.

Step 3: Choose the access points

Business access points are different from home routers and mesh systems in ways that matter in an office:

• They are powered over the network cable (PoE), so you only need one cable to the ceiling.
• They are managed together from one place, and devices move between them smoothly.
• They handle many connected devices at once much better.

Examples:

• TP-Link Omada EAP650 / EAP670 (Wi-Fi 6) — best value for most small offices. Check price on Amazon
• Ubiquiti UniFi U7 Pro (Wi-Fi 7) — for new installs you want to last many years. Check price on Amazon
• MikroTik cAP ax — ceiling access point that fits into a MikroTik network. Check price on Amazon

Do you need Wi-Fi 7 for an office? Usually not yet. In a busy office the limit is the number of devices and interference, not top speed. A well-placed Wi-Fi 6 system is enough for most small offices in 2026.

Step 4: The switch and cabling

• Get a PoE switch with enough ports for access points, IP phones and cameras. Check that its PoE power budget covers all of them.
• Use Cat6 cable for new runs.
• Label both ends of every cable. It takes minutes now and saves hours later.
• Put the router and switch on a small UPS. A short power cut should not take the whole office offline.

See managed PoE switches on Amazon · See small UPS units on Amazon

Step 5: Separate the networks

Create at least three networks (VLANs), each with its own Wi-Fi name if needed:

This is the single most useful security step in a small office. A visitor’s infected phone, or a cheap camera with bad firmware, should never be able to see the accounting PC.

Step 6: Make voice calls reliable

If your office uses VoIP phones, softphones or Teams/Zoom all day, voice is the first thing people notice when the network is bad. From running a call-center network, these are the things that matter most:

1. Cable the phones and the PCs that make calls whenever possible. Wi-Fi calls work, but a cable removes a whole category of problems.
2. Prioritize voice traffic on the router (QoS), so a large download doesn’t break calls.
3. Put IP phones on their own VLAN. It makes prioritization and troubleshooting easier.
4. Check the upload speed of your internet line, not just download. Every call uses upload.
5. Consider a second internet line from a different provider with automatic failover if calls are your business.

Step 7: Security basics you should not skip

• Change every default admin password, and don’t allow management from the internet.
• Use WPA3 (or WPA2/WPA3 mixed) on staff Wi-Fi.
• Turn on automatic firmware updates, or put a monthly reminder in the calendar.
• Change the guest Wi-Fi password regularly.
• Keep a simple document: what equipment you have, where it is, admin logins stored in a password manager.

Common mistakes I see

• Wi-Fi extenders. They cut speed and cause dropouts when people walk around. Use cabled access points instead.
• Home mesh kits in a 30-person office. They are designed for families, not for many users at once.
• Everything on one flat network. Guests, cameras and the finance PC all together.
• The router hidden in a metal cabinet with Wi-Fi turned on.
• No one knows the admin password because the person who installed it left.

Example setups

10–15 people, one floor

• 1 router (UniFi Cloud Gateway or Omada router)
• 1 small 8-port PoE switch
• 2 ceiling access points
• Small UPS

30–50 people, open-plan or call center

• 1 stronger router (for example MikroTik RB5009 or a higher-end UniFi gateway)
• 1 24-port managed PoE switch
• 3–4 ceiling access points, placed above the seating areas
• Separate VLANs for staff, voice, guest and devices
• UPS for router and switch, and ideally a backup internet line

FAQ

Can I just buy a bigger home router?

For under ten people, often yes. Above that, the number of devices, the need for separate networks, and roaming between rooms make business equipment worth the small extra cost.

How many access points do I need?

Start with one per 15–25 active users in open space, or one per enclosed room with heavy walls. Then check coverage with a free Wi-Fi analyzer app on a phone and adjust.

Is MikroTik good for small offices?

Yes, if someone on the team knows networking. It is very capable and affordable, but the interface assumes you know what a VLAN and a firewall rule are. If not, UniFi or Omada is easier to live with.

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