What Is Colocation? A Practical UK Buyer's Overview
Colocation explained without jargon — racks, power, remote hands and when 1U to full-cabinet colo in Cambridge beats the public cloud.
Colocation means you own or lease the servers; the provider supplies professional space, power, cooling, security and network in a data centre. You keep control of the hardware and software stack. We keep the facility and connectivity running.
At Fast2Host that facility is our privately owned Cambridge data centre on AS48825 — Tier III design, dual power paths and always-on DDoS on the edge.
Who colo is for
- Hardware you must control end-to-end (compliance, specialised NICs, GPUs, appliances).
- Predictable monthly costs instead of cloud bill shock from egress and managed extras.
- Hybrid designs: keep latency-sensitive or regulated kit in Cambridge and burst to the public cloud when needed.
- Teams that already own HPE, Dell or whitebox gear and do not want to re-buy the same capacity as cloud VMs.
If you are still weighing models, see Cloud vs colocation.
Typical footprints
| Size | Typical use |
|---|---|
| 1U–5U | Single servers, firewalls, edge appliances |
| Quarter rack (10U) | Growing stacks with room to expand |
| Half rack (21U) | Serious production + storage |
| Full rack (42U) | Private cabinets, bring-your-own gear |
Start where the hardware fits; grow U-count or amps when draw and ports demand it — not because a homepage package forced a jump.
What “good” colo includes in the UK
- Dual A+B power, N+ cooling, biometric access and logged entry
- Real remote hands on site — not a ticket that waits until Monday
- Carrier-neutral connectivity and peering (we operate AS48825 with LINX/LONAP membership)
- Always-on DDoS filtering at the edge
- Clear power capacity (amps), not “power included” with no number
Power and cooling drive serious colo cost more than empty U-count. We explain that model in why we charge in amps.
How UK colocation pricing usually works
Headline package prices cover a footprint plus a baseline of power feeds, a network port, a bandwidth commit and IPs. Quotes then move mainly with reserved amps and bandwidth. For current Fast2Host from-prices by size — and a fair quote checklist — read the UK Colocation Pricing Guide 2026.
Also walk the colocation buyers guide before you sign: density, contract term and dual-feed design matter as much as the monthly sticker.
Colo vs dedicated vs cloud (quick)
| Need | Often fits |
|---|---|
| Your own metal, your OS, facility ops shared | Colocation |
| Whole server, provider-owned hardware | Dedicated servers |
| Fast VMs, elastic experiments, no racking | Cloud VPS or public cloud |
Many UK teams land on hybrid: colo or dedicated for the steady core, cloud for burst and managed services.
Next step
Browse colocation packages, open the UK Server Colocation hub for the size finder and power calculator, or request a quote with your U-count and amp target.