Summary
On-premises (often shortened to "on-prem") means running software and infrastructure in facilities owned or operated by the using organisation, instead of consuming it from a public cloud provider.
What is On-Premises?
In an on-premises setup, the servers, storage, networking, and software live in the organisation's own data centre, server room, or colocation rack. Hardware procurement, capacity planning, physical security, power and cooling, plus the full software lifecycle, are managed in-house or by contracted partners.
For some workloads, on-premises remains the default rather than an exception. Regulated industries, classified environments, latency-sensitive industrial setups, and very large steady-state workloads often run cheaper, simpler, or more compliant in their own data centre. Many "private cloud" deployments are on-premises Kubernetes or OpenStack environments that present cloud-style APIs on owned hardware.
The term overlaps with self-hosting, but is not identical. Self-hosting can also happen on a rented VM at a hosting provider; on-premises specifically implies physical premises and infrastructure controlled by the organisation. Modern compliance regimes (DORA, NIS2) and sovereignty considerations have brought on-premises back into serious discussion alongside hyperscaler cloud.
Why is On-Premises relevant?
- Data residency: Keeps data physically within a chosen jurisdiction or building
- Compliance: Easiest answer for "where does our data actually live"
- Predictable cost: Capex-heavy but stable, with no surprise egress or per-API fees
- Latency and control: Direct hardware access for low-latency or specialised workloads
Related Terms
- Self-Hosting: Broader concept that includes on-prem and rented-VM operation
- Bare Metal: Physical-server model commonly used in on-premises setups
- Control Plane: Often kept on-premises for sovereignty even when data planes span clouds
- Mesh VPN: Connects on-premises sites to private cloud workloads without a concentrator