How to Set Up a Small Office Network from Scratch

The short answer

A reliable network for 10–30 people is built in this order: requirements → internet → router → switch → access points → IP plan and segments → printers and shared devices → documentation. Skipping the first and last steps is what usually turns a small office network into a constant source of complaints.

Step 1. Write down the requirements

Before buying anything, make a simple table:

• People and devices: laptops, desktops, phones, printers, IP phones, cameras, TVs in meeting rooms. Count roughly two to three devices per person.
• Services: cloud apps, video calls, file sharing, accounting software, remote access for staff working from home.
• Floor plan: rooms, walls, where desks and meeting rooms are, where cables can run.
• Growth: how many people may join over the next two years.

This list decides the number of switch ports, how many access points you need and how much bandwidth to order.

Step 2. Choose the internet provider

• Ask for business tariffs with a service level agreement and a support line that answers outside business hours.
• Prefer fibre where available; compare upload speed, not only download — video calls and cloud backups depend on it.
• Ask whether you get a static IP address; it simplifies VPN and remote access.
• If downtime is expensive, order a second line from a different provider, ideally using a different physical route into the building.

Step 3. Router or firewall

The router is the edge of your network. For an office, look for:

• Real throughput with NAT, firewall and VPN enabled, not only the headline number.
• VLAN support, a built-in VPN server and, ideally, two WAN ports for failover.
• Regular firmware updates from the vendor.

Avoid using the ISP-supplied home router as the main device: it rarely supports segments or proper logging.

Step 4. Switch

• Choose a managed (or "smart") switch so you can configure VLANs.
• Get PoE ports to power access points, IP phones and cameras without separate adapters.
• Take more ports than you need today — around 30–50% spare is a sensible margin.
• Gigabit ports are the baseline; uplinks to the router can be faster if your plan grows.

Step 5. Wi-Fi access points

• Use ceiling-mounted access points from one vendor with central management, not a set of separate home routers.
• Plan coverage by rooms and walls, not by the "range" on the box. Concrete and glass walls cut the signal sharply.
• Connect every access point by cable; wireless repeaters can roughly halve usable speed.
• Use the same network name (SSID) across all points so devices roam smoothly.

Step 6. IP plan and segments

Split the network into VLANs so a problem in one part does not affect the others. A typical plan:

• Give fixed addresses (DHCP reservations) to printers, servers and network equipment.
• Guests get internet only, with no access to other VLANs.
• Store the plan in a shared document, not in someone's head.

Step 7. Printers and shared devices

• Put printers in their own segment and allow access only from the staff VLAN.
• Connect printers by cable where possible; Wi-Fi printers are a common source of "printer not found" errors.
• Change default admin passwords and disable unused protocols on printers.

Budget: what drives the cost

Instead of a fixed number, estimate these factors:

• Equipment: router, switch, access points, a small rack or wall cabinet, UPS.
• Cabling: number of outlets, cable length, ceiling access — often the largest item in a new office.
• Internet: monthly tariff, second line, static IP.
• Work: design, installation, configuration and documentation.
• Support: who monitors updates and fixes problems after launch.

Buying cheaper access points and saving on cabling is the most common way to pay twice.

Common mistakes

• One flat network where guests, printers and accounting share the same subnet.
• Access points chained through repeaters instead of cable.
• No UPS for the router and switch: a short power cut drops the whole office.
• No documentation of passwords, addresses and cable labels.