When someone says “IT infrastructure,” the phrase can mean everything from a single Wi-Fi router to a global network of data centers. For most midsize businesses, the reality sits somewhere in between, and understanding what your infrastructure should look like at your current size is one of the most practical things you can do for your organization.
This guide breaks down modern IT infrastructure by component, shows real-world examples at three company sizes, and provides budget benchmarks so you know whether your spending is in the right range.
The Core Components of IT Infrastructure
Every business IT environment is built from the same fundamental categories, regardless of size. The scale and sophistication change, but the categories remain constant.
Network Infrastructure
Your network is the foundation everything else runs on. It includes:
- Switches and routers that move data between devices and the internet
- Firewalls that control what traffic enters and leaves your network
- Wi-Fi access points that provide wireless connectivity
- Internet connections (often redundant for reliability)
- VPN or zero-trust network access for remote workers
A slow or unreliable network affects every employee, every application, and every customer interaction. It is the single most impactful infrastructure investment you can make.
Compute Infrastructure
Compute refers to the servers and processing power that run your applications and services:
- Cloud compute (AWS EC2, Azure VMs, Google Cloud) for scalable workloads
- On-premise servers for applications requiring local data or low latency
- Virtual desktop infrastructure (VDI) for remote or regulated environments
- Endpoint devices (laptops, desktops, thin clients) for individual users
The trend for the past decade has been toward cloud compute, but many businesses still maintain hybrid environments with on-premise servers for specific workloads.
Storage Infrastructure
Where your data lives and how it is protected:
- Cloud storage (SharePoint, Google Drive, Dropbox Business) for collaboration
- Network-attached storage (NAS) for large local file repositories
- Storage area networks (SAN) for high-performance database and application storage
- Backup systems (cloud-based and local) for disaster recovery
- Archival storage for long-term retention and compliance
Security Infrastructure
The tools and systems that protect everything else:
- Endpoint detection and response (EDR) on all devices
- Email security (filtering, phishing protection, encryption)
- Identity and access management (IAM) including multi-factor authentication
- Security information and event management (SIEM) for monitoring
- Vulnerability scanning and patch management
Communication Infrastructure
How your team communicates internally and with clients:
- Email and calendaring (Microsoft 365 or Google Workspace)
- Voice systems (VoIP platforms like Teams Phone, RingCentral, or Zoom Phone)
- Video conferencing (Teams, Zoom, Google Meet)
- Instant messaging and collaboration (Slack, Teams chat)
Management and Monitoring Infrastructure
The systems that keep everything running:
- Remote monitoring and management (RMM) tools
- Ticketing and service desk platforms
- Documentation systems for network diagrams and procedures
- Asset management for tracking hardware and software licenses
Infrastructure Examples by Company Size
The 25-Employee Company
A professional services firm with a single office in Manhattan, 25 employees, and standard business applications.
Network:
- Business-grade internet (500 Mbps fiber) with a secondary LTE failover connection
- A unified threat management (UTM) firewall appliance
- One or two enterprise-grade Wi-Fi access points
- A managed switch for wired connections in the office
Compute:
- No on-premise servers. All workloads run in the cloud
- Laptops for all employees (a mix of Windows and Mac)
- One or two shared monitors or conference room displays
Storage:
- Microsoft 365 with SharePoint and OneDrive for all file storage
- Cloud-based backup for Microsoft 365 data (a common oversight since Microsoft does not fully back up your data by default)
Security:
- EDR on all endpoints (CrowdStrike, SentinelOne, or Microsoft Defender for Business)
- Microsoft 365 built-in email security plus a third-party phishing simulation tool
- MFA enforced on all accounts via Azure AD / Entra ID
- Automated patch management through RMM tooling
Communication:
- Microsoft 365 for email, calendar, and Teams chat
- Zoom or Teams for video conferencing
- A cloud VoIP system with 10-15 phone lines
Estimated annual IT spend: $60,000-$100,000 (including managed services, licensing, and hardware refresh). That works out to roughly $2,400-$4,000 per employee per year.
The 75-Employee Company
A financial services firm with two offices (Midtown and Jersey City), 75 employees, compliance requirements, and a mix of cloud and legacy applications.
Network:
- Dedicated internet (1 Gbps fiber) at each location with automatic failover
- Enterprise firewalls with site-to-site VPN connecting both offices
- Multiple Wi-Fi access points per floor with separate guest and corporate networks
- Managed switches with VLANs to segment network traffic by department
Compute:
- Two small on-premise servers: one for a legacy line-of-business application, one for local Active Directory (hybrid with Azure AD)
- Cloud infrastructure (Azure) for newer applications and development environments
- Standardized laptops with full disk encryption for all employees
- Conference room systems with Teams Rooms or Zoom Rooms hardware
Storage:
- SharePoint and OneDrive for general collaboration
- An on-premise NAS for large media files and legacy data
- Enterprise backup covering both cloud and on-premise data with offsite replication
- Archival storage for 7-year compliance retention requirements
Security:
- EDR on all endpoints with centralized management
- Email security gateway with advanced threat protection
- SIEM or managed detection and response (MDR) service for 24/7 monitoring
- Annual penetration testing and quarterly vulnerability scans
- Privileged access management for IT administrators
- Security awareness training for all employees
Communication:
- Microsoft 365 E3 or E5 licensing for the full suite
- Teams Phone with direct routing for enterprise voice
- Conference room hardware at both locations
Estimated annual IT spend: $225,000-$375,000. Per employee, that is $3,000-$5,000 per year, reflecting the increased complexity of multi-site operations and compliance requirements.
The 200-Employee Company
A healthcare organization with three locations across the NYC metro area, 200 employees, HIPAA compliance, and a mix of clinical and administrative systems.
Network:
- Redundant internet connections at each site with SD-WAN for intelligent traffic routing
- Enterprise-grade firewalls with intrusion prevention at each location
- Centrally managed Wi-Fi with network access control (NAC)
- Network segmentation isolating clinical systems from administrative and guest traffic
Compute:
- On-premise servers in a small data center or colocation facility for electronic health records (EHR) and clinical systems
- Cloud infrastructure (Azure or AWS) for administrative applications, email, and collaboration
- Virtual desktop infrastructure for clinical workstations (enabling any-device access to patient systems)
- Standardized hardware fleet with automated provisioning
Storage:
- Enterprise file sync and share for administrative users
- High-performance storage for clinical databases and imaging
- HIPAA-compliant backup with encrypted offsite replication and tested disaster recovery
- Tiered storage with automated lifecycle management (hot, warm, cold)
Security:
- Full SIEM with 24/7 security operations center (SOC) monitoring
- EDR on all endpoints, including clinical workstations
- Network detection and response (NDR) for lateral movement detection
- Data loss prevention (DLP) for PHI and PII
- Annual risk assessments and penetration testing per HIPAA requirements
- Vendor risk management program for third-party access
- Incident response plan with regular tabletop exercises
Communication:
- Microsoft 365 E5 with advanced compliance features
- Enterprise voice with call center capabilities for patient scheduling
- Secure messaging for clinical staff (HIPAA-compliant)
Estimated annual IT spend: $700,000-$1,200,000. Per employee, that is $3,500-$6,000, with the higher end reflecting the cost of HIPAA compliance and clinical system management.
Cloud vs. On-Premise vs. Hybrid: Where Things Stand
The cloud-versus-on-premise debate is largely settled for most midsize businesses: hybrid is the practical reality.
Cloud-first makes sense for:
- Email and collaboration (Microsoft 365, Google Workspace)
- CRM and business applications (Salesforce, HubSpot, NetSuite)
- File storage and sharing
- Backup and disaster recovery
- New application development
On-premise still makes sense for:
- Legacy applications that cannot be migrated cost-effectively
- Workloads with extreme latency requirements
- Certain regulatory scenarios requiring physical data control
- Very large local datasets (media, engineering files, medical imaging)
The hybrid approach connects cloud and on-premise resources through secure networking, unified identity management, and consistent security policies. Most of the 75+ employee environments we work with at SBK Consulting operate in a hybrid model, even if the long-term trajectory is increasingly cloud-native.
If you are considering a migration, our cloud transformation services can help you evaluate which workloads to move and in what order.
Budget Benchmarks: What You Should Be Spending
Industry data and our own experience suggest the following benchmarks for total IT spend (infrastructure, support, licensing, and projects):
| Company Size | Annual IT Spend Per Employee | Total Annual IT Budget |
|---|---|---|
| 25 employees | $2,400-$4,000 | $60,000-$100,000 |
| 75 employees | $3,000-$5,000 | $225,000-$375,000 |
| 200 employees | $3,500-$6,000 | $700,000-$1,200,000 |
These ranges account for geographic variations (NYC costs run higher than national averages) and industry requirements (regulated industries like healthcare and financial services skew toward the higher end).
If your spending is significantly below these ranges, you may be accumulating technical debt that will cost more to address later. If you are significantly above, there may be optimization opportunities in licensing consolidation, vendor renegotiation, or architecture simplification.
Building Your Infrastructure Roadmap
Understanding what good infrastructure looks like is the first step. Building a plan to get there is the second. A solid infrastructure roadmap should include:
- Current state assessment documenting what you have today
- Gap analysis comparing your environment to the appropriate benchmark for your size and industry
- Prioritized project list addressing the highest-risk gaps first
- Budget forecast covering the next 3 years with quarterly milestones
- Refresh schedule for hardware and software lifecycle management
Frequently Asked Questions
What is the most important IT infrastructure component for a small business?
Network reliability and security. Every other system depends on the network, and a security breach can be an existential threat to a small business. Start with a business-grade firewall, reliable internet with failover, endpoint protection, and MFA on all accounts. Build everything else from that foundation.
How often should IT infrastructure be replaced?
Hardware like laptops and servers typically has a 3-5 year lifecycle. Network equipment can last 5-7 years. Cloud infrastructure eliminates hardware refresh cycles for those workloads. The key is having a planned refresh schedule rather than waiting for equipment to fail.
Is cloud infrastructure cheaper than on-premise?
For most midsize businesses, cloud infrastructure reduces capital expenditure and provides better scalability, but the monthly operating costs can exceed on-premise costs over time for stable workloads. The real savings come from reduced management overhead, built-in redundancy, and the ability to scale up or down as needed.
How do I know if my IT infrastructure is outdated?
Common signs include frequent outages, slow application performance, security tools that are out of support, inability to support remote work effectively, and compliance audit findings. If your staff regularly works around IT limitations rather than being enabled by technology, your infrastructure likely needs investment.
Should a small business use AWS, Azure, or Google Cloud?
For most small and midsize businesses, the choice depends on your existing ecosystem. If you use Microsoft 365, Azure integrates most naturally. If you use Google Workspace, Google Cloud offers the tightest integration. AWS is the most broadly capable platform but has a steeper learning curve. In practice, many businesses use a mix without even realizing it.