In short: Private 5G and Wi-Fi solve different problems. Wi-Fi is best for indoor, mostly-static use within a single building. Private 5G wins for wide-area coverage, mobility, dedicated capacity, sub-10ms latency, and SIM-based device authentication. Most real-world sites end up using both.
Key Takeaways
- Wi-Fi wins indoor, static, single-building — cheap, fast, ubiquitous, easy
- Private 5G wins outdoor, mobile, wide-area, mission-critical — predictable, secure, dedicated
- They're complementary, not competing — production sites typically run private 5G as the primary connectivity layer with Wi-Fi extending it indoors
In a nutshell
The Question Behind the Question
When someone asks "private 5G vs Wi-Fi", they're usually really asking one of these:
- Should I extend the Wi-Fi network we already have, or build something new?
- We tried Wi-Fi and it kept dropping out — is private 5G the answer?
- We're spending money on outdoor mesh Wi-Fi every year. Is there a better way?
The honest answer is "it depends on what you're connecting and where." Below is the framework we use when customers ask.
Coverage
Wi-Fi. Designed for short range. A typical access point covers 30 metres indoors, less through walls. Outdoor mesh Wi-Fi pushes that further but performance degrades with distance and interference. Adding new buildings or outdoor areas means more access points, more cabling, more controllers.
Private 5G. A single 5G radio covers hundreds of metres outdoors and can deliver useful signal indoors at the same time. One outdoor radio can replace 20 Wi-Fi access points across a large yard, farm, or holiday park.
Verdict: Wi-Fi if you're inside one building. Private 5G if your site is bigger than that, or has outdoor areas, or has buildings spread across a campus.
Capacity Under Load
Wi-Fi. All devices on an access point share the same radio. As more devices connect — guests at a hotel, workers on a shift change, IoT sensors waking up — throughput per device drops. There's no enforced fairness; one chatty device can starve others.
Private 5G. A 5G radio scheduler allocates time slots per device with predictable fairness. Add more devices and per-device throughput drops more gracefully. You can also reserve guaranteed capacity for specific devices (CCTV, autonomous vehicles, push-to-talk) using QoS.
Verdict: Wi-Fi for small device counts. Private 5G for sites with many devices, mixed device types, or use cases that need guaranteed bandwidth.
Latency
Wi-Fi. Typical latency is 5–30 ms but varies wildly under contention. Not predictable enough for time-sensitive applications.
Private 5G. Modern 5G Standalone delivers consistent 5–10 ms latency. Network slicing can reserve sub-5 ms for specific applications.
Verdict: Wi-Fi is fine for general use. Private 5G is the right choice for autonomous vehicles, robotics, AR overlays, push-to-talk voice, or any application where jitter matters more than peak speed.
Security
Wi-Fi. Can be made secure (WPA3, 802.1X, certificates) but requires effort, and the default posture is weak. Anyone with the password gets in. Devices can be easily spoofed.
Private 5G. Every device authenticates via a SIM card with a cryptographic key minted by the operator. SIMs are cryptographically tied to specific devices and policies. Traffic is encrypted on the radio interface by default. Removing access means revoking a SIM in the network — instant, central, auditable.
Verdict: For BYOD and guest access, Wi-Fi is fine. For fleets of operational devices, sensors, or anything you'd rather not see compromised, private 5G is structurally more secure.
Mobility
Wi-Fi. Roaming between access points works but is rough — 1–3 second drops are common, voice calls drop, video buffers. Building Wi-Fi to roam smoothly across a large campus is genuinely hard.
Private 5G. Designed for mobility from day one. Devices roam between cells the way phones roam between public mobile cells: invisibly, with no perceptible drop. Voice and video stay up.
Verdict: Wi-Fi for static devices. Private 5G for anything that moves between buildings, between floors of a large facility, or across a yard.
Cost
Wi-Fi. Cheap to start. A consumer Wi-Fi 6 router is £100. Enterprise Wi-Fi for a small office is a few thousand. Costs balloon when you scale to a large campus or outdoor area — the access point count grows linearly with coverage.
Private 5G. Higher entry cost than a single Wi-Fi access point, lower at scale. A managed private 5G subscription (like Aerix from £40/month for the customer end) avoids the capex spike entirely. The break-even versus dense Wi-Fi typically comes around the size of a medium hotel, a holiday park, a factory, or a multi-building campus.
Verdict: Wi-Fi if your site is small. Private 5G if it's large, outdoor, or grows over time.
When You Need Both
In practice, most production sites run both:
- Private 5G as the primary backbone — covering the whole site, connecting fixed buildings via routers, mobile devices via SIMs, and IoT/operational equipment via embedded modules.
- Wi-Fi inside buildings — fed by a private 5G router, providing local connectivity to laptops, tablets, phones and guests. The Wi-Fi router is connected to the internet via the private cellular network rather than a fixed line.
This pattern lets you use Wi-Fi where it shines (cheap, fast indoor coverage for end-user devices) and private 5G where it shines (wide-area coverage, mobility, mission-critical reliability) without choosing between them.
Quick Decision Guide
| If you need... | Choose |
|---|---|
| Connectivity inside one building | Wi-Fi |
| Connectivity across a campus or outdoor area | Private 5G |
| Static laptops and phones | Wi-Fi |
| Moving devices, vehicles, body cams | Private 5G |
| Sub-10ms latency at scale | Private 5G |
| Cheap broadband for guests in a small office | Wi-Fi |
| Managed broadband for a holiday park or rural community | Private 5G |
| Mission-critical CCTV, push-to-talk, or autonomous systems | Private 5G |
Wondering which fits your site? Talk to us — we'll tell you straight, including when private 5G is overkill. Or check our coverage map to see if you're in an area we already serve.