Managing 50 sites vs 5: When is SD-WAN worth considering?

If you're responsible for a growing organisation, it's easy to assume that Software-Defined Wide Area Networking (SD-WAN) only becomes relevant once you've reached a certain number of locations. In reality, SD-WAN is not defined by how many sites you have. It's worth considering when your network becomes harder to manage, secure or scale using traditional approaches.

Managing 50 sites can certainly expose those challenges more clearly than managing five. But site count alone isn't the deciding factor. What matters is the level of visibility, resilience and control your organisation needs.

What changes when you go from 5 sites to 50?

The biggest difference isn't simply scale.

At five sites, most IT teams can still manage the network through a combination of monitoring tools, supplier relationships and team knowledge. At 50 sites, that informal approach becomes much harder to sustain.

The important point is that these challenges can also appear in smaller estates. Managing five sites that support revenue-critical operations can be more demanding than managing dozens of low-dependency locations.

Why traditional networking approaches become harder to scale

Most organisations don't intentionally create complex networks.

Growth often happens through:

• New site openings
• Acquisitions
• Relocations
• Business expansion
• Changing application requirements

Over time, that can leave organisations with:

• • Multiple connectivity providers
  • Different router and firewall models
  • Different support arrangements
  • Different service levels
  • Inconsistent configurations

None of these decisions are necessarily wrong.

The challenge is that complexity accumulates. Each variation adds another dependency that the IT team needs to understand, support and troubleshoot.

This is often the point where organisations start questioning whether their networking approach still matches their operational needs.

Visibility is usually the first warning sign

59% of IT leaders lack complete visibility into their IT infrastructure, and as a result 77% say they're unable to quickly meet the needs of the business due to a lack of internal resources and skills. (Daisy Corporate Services, survey of 250 UK senior IT decision-makers, via IT Reseller Magazine)

One of the clearest indicators that a network is becoming difficult to manage is when teams spend more time finding information than fixing problems.

Questions that should be simple become difficult to answer:

• Which sites are experiencing issues?
• Which applications are affected?
• Is the problem isolated or widespread?
• Which provider owns the affected circuit?
• Does that site have resilient connectivity?

Without a central view, answers may be spread across monitoring systems, supplier portals, spreadsheets and internal documentation.

For time-poor IT leaders, that creates operational friction long before it becomes a technical problem.

This is where people get caught out

Many organisations assume they'll know when it's time to modernise their network.

In reality, complexity tends to build gradually. A new office is added using the supplier available locally. An acquired business retains its existing connectivity. A temporary workaround becomes part of the permanent estate. Different teams own different contracts.

None of these decisions creates a problem by itself. Collectively, they can leave the network increasingly difficult to understand and support.

One warning sign is when key knowledge sits with a small number of individuals. Another is when routine questions require information from multiple systems before decisions can be made.

At that stage, the challenge is often operational complexity rather than network performance.

The hidden risk isn't downtime

When organisations think about networking, they often focus on outages.

The broader risk is inconsistency.

Over a quarter (33%) of UK businesses report revenue losses of up to £4 million due to network outages or poor performance, with an additional 18% losing more than that. (Expereo, Enterprise Horizons 2025, via Computer Weekly, July 2025)

One location may have resilient connectivity and excellent application performance. Another may rely on a single connection, experience slower response times and follow a completely different support process.

That inconsistency can affect:

• Employee productivity
• Customer experience
• Adoption of cloud services
• Business continuity planning
• Confidence in IT services
• Future expansion plans

The goal is not to make every site identical.

A head office, warehouse, retail branch and contact centre may all require different levels of connectivity and resilience.

The objective is to ensure those differences are intentional rather than accidental.

Is SD-WAN only for larger estates?

No. This is one of the most common misconceptions about SD-WAN.

Following a wave of IT disruptions across the sector, nearly half (50%) of UK businesses have been forced to re-evaluate their technology infrastructure, and 35% of UK tech leaders say networking has risen higher up the C-suite agenda as a result. Networking and connectivity is now the top technology investment priority for UK businesses. (Expereo, Enterprise Horizons 2025, via Computer Weekly, July 2025)

Managing 50 sites often makes the benefits easier to see because operational complexity is more visible. However, organisations with a smaller number of sites may still find value in SD-WAN.

For example, SD-WAN may be worth considering if:

• Downtime has a significant business impact
• Cloud applications are heavily relied upon
• Sites require resilient connectivity
• The IT team needs greater visibility
• Multiple connectivity services need managing

The question is not "How many sites do we have?". The better question is:

"How easy is our network to manage, monitor and scale?"