Colocation vs On-Premise Server Rooms: An Honest Guide from Someone Who Built Both

19 Jun 2026, by James Braunegg, CEO and Founder, Micron21

Most articles comparing colocation with on-premise server rooms are written by people who have only ever sold one side of the argument. I am in an unusual position: I have lived both. Micron21, today an Uptime Institute certified Tier IV data centre operator, did not start as a data centre at all. It started as an on-premise server room inside my father’s printing company, RA Printing. We had a need, that need grew, and twenty years later it had grown into Micron21.

So when I talk about what it takes to run your own server room, and what it takes to turn one into mission-critical infrastructure, it is not theory. It is twenty years of life lessons in infrastructure, some of them learned the expensive way. This guide lays out the real comparison: what an on-premise server room actually costs, what colocation actually gives you, and how to decide which is right for your business.

How a printing company's server room became a Tier IV data centre

In the early days, our server room did what most do: it ran the business systems, it sat in a spare room, and it worked, mostly. But as the hosting side of the business grew, every weakness revealed itself in turn. Power needed UPS protection, then generators. Cooling needed redundancy, because one failed air conditioner on a summer weekend is all it takes. Connectivity needed multiple carriers. Security needed to evolve from a locked door to monitored, logged, layered access. Every one of those lessons cost money, time and sleep.

Eventually we made the decision to go all in: the printing company was sold, and the infrastructure business became the business. We rebuilt the facility around a live customer workload into what became the first data centre in Australia to achieve Uptime Institute Tier IV Fault Tolerant Design Certification. My point is not that this is impossible. It is that it took twenty years, total commitment and a family willing to bet the company on it. That is the honest scale of the undertaking, and it is exactly why, for almost every business, colocation becomes the obvious choice.

What each option actually means

An on-premise server room means your hardware lives in your building: a converted office, a comms room, sometimes little more than a cupboard with an air conditioner. You own everything and you are responsible for everything: power, cooling, fire protection, security, connectivity and the 2am callout.

Colocation means your hardware lives in a purpose-built data centre. You still own and control your servers, but the facility provides the environment: physical security, continuous power, continuous cooling and around-the-clock monitoring. At Micron21 that means anything from a single 1RU server to a high-density 30kW rack of GPU hardware, housed in a certified Tier IV facility.

The true cost of "free": what an on-premise server room really involves

The biggest trap in this comparison is that the server room looks free. The space is already there, the power point works, and the first server hums along nicely. But the moment those servers matter to your business, the real bill arrives in instalments:

• Power protection: a proper UPS fleet, and then a generator, and then maintenance contracts and fuel testing for both, because batteries only buy you minutes.
• Cooling: redundant air conditioning running 24/7, sized for your densest rack on the hottest February afternoon, with someone watching for the day one unit fails.
• Fire protection: sprinklers protect the building by destroying the servers. Proper suppression systems for IT spaces are specialised and expensive.
• Connectivity: one carrier into one building is one backhoe away from an outage. Diverse paths from multiple carriers into an office building are often simply unavailable, or eye-wateringly priced.
• Security and compliance: access control, CCTV, logging and audit trails. Insurers and auditors increasingly ask hard questions about where data physically lives, and "an unlocked room near the kitchen" can jeopardise cyber insurance and fail compliance frameworks outright.
• People: someone has to respond at 2am, patch, monitor, and maintain it all, every weekend and every holiday, forever.

Each item is manageable on its own. Together, they are a second business hiding inside your business, and industry analyses consistently find colocation significantly cheaper than running equivalent on-premise infrastructure once these hidden costs are counted honestly. Worse, on-premise costs arrive as lumpy capital surprises: the failed UPS, the obsolete air conditioner, the renovation when you outgrow the room.

Colocation vs on-premise: head to head

The part nobody budgets for: keeping data flowing

Even a well-built server room shares one structural weakness with a bad colocation provider: connectivity. What is the use of a server that is powered on if the data is down? Your office building was built for desks, not diverse fibre. One carrier, one path, one cut.

This is exactly why Micron21 built AS38880 as a global network: to provide safe and secure data services that keep client services online, not merely powered. With more than 2,000 BGP peers, direct interconnection with every major network in Australia and worldwide, and our own global DDoS scrubbing platform absorbing attacks in real time, colocation with Micron21 upgrades not just your building but your entire path to the internet. That is a difference no office server room, and frankly few data centres, can match.

What you inherit on day one

Here is the way I encourage businesses to think about it: when you colocate in a certified facility, you inherit twenty years of infrastructure engineering in the time it takes to rack a server. At Micron21 that inheritance includes Uptime Institute certified Tier IV fault tolerance, SCEC Zone 4 physical security, ISO 27001 with the 27017, 27018 and 27019 extensions, IRAP assessment history since 2018, Essential Eight Maturity Level 2 across our organisation, and standing as a reporting entity under the SOCI Act. Reproducing even a fraction of that compliance posture in an office server room is not a project; it is a career.

And because Micron21 is also a cloud provider, colocation here comes with a growth path: when some workloads are better off elastic, mCloud and GPU as a service live in the same building, on the same network, a cross-connect away.

When does on-premise still make sense?

Honesty requires balance. A small on-site cache or print server, equipment physically tied to a factory floor, or workloads with hard real-time requirements to local machinery can all justify on-premise hardware. The sensible pattern for most businesses is a small on-site footprint for what must be local, with everything that matters living in a certified facility. What is increasingly hard to justify is the full mission-critical server room in an office building, carrying business-critical data without redundancy, certification or 24/7 eyes.

And if you truly want to build your own data centre: call me

This might be the strangest thing a data centre owner has ever put in a blog post, but I mean it. If you are reading this and you truly want to build your own facility, contact me. I would love to share personal stories and insights on how I did it: the mistakes, the costs, the certification journeys and the things I wish someone had told me twenty years ago. I am more than happy to welcome you to the community, because Australia needs more sovereign, safe and secure local data centre operators, not fewer. Just go in with your eyes open: it is a magnificent, brutal, twenty-year apprenticeship. For everyone else, that is precisely what colocation is for.

Frequently asked questions

Is colocation cheaper than running an on-premise server room?

Once you account for redundant power, cooling, fire suppression, diverse connectivity, security, compliance and after-hours staffing, colocation is usually significantly cheaper than building and operating equivalent on-premise infrastructure, and it converts unpredictable capital surprises into a predictable monthly cost.

Do I lose control of my servers with colocation?

No. With colocation you still own and fully control your hardware, operating systems and applications. The provider supplies the environment around them: power, cooling, physical security, connectivity and monitoring. You keep the control of on-premise without carrying the facility risk.

What happens to my server room kit if I move to colocation?

In most cases your existing servers move with you; that is the point of colocation. Micron21 accommodates anything from a single 1RU server to full high-density racks, and our team can assist with planning the migration so services stay online through the transition.

The bottom line

I am proof that a server room can become a data centre, and that journey is also my strongest argument for why yours probably shouldn’t have to. Every business needs to grow, but building mission-critical facilities is a twenty-year discipline, and your business almost certainly has better things to master. Colocation gives you everything the server room was trying to be: certified Tier IV power and cooling, SCEC Zone 4 security, an IRAP assessed environment, the AS38880 global network with built-in DDoS protection, and Australians watching it all 24/7, which is why we believe Micron21 is the best choice for colocation in Australia, particularly if you are in Melbourne.

Bring us the hardware; keep the control; lose the 2am callouts. Talk to the team or book a tour of our Melbourne facility. And if you are the one in a thousand who wants to build your own: seriously, call me.