The Real Cost of Self-Hosting: Electricity, Time, and What You Actually Save

There is a story self-hosters tell themselves, usually at about 1am while staring at a rack of blinking lights, and it goes like this: “I’m saving so much money by not paying for all these subscriptions.” It is a lovely story. It is also, in my experience, mostly fiction — or at least a great deal more complicated than the version we like to repeat at dinner parties to justify the noise coming from the cupboard.

I self-host a ridiculous amount of my life. I am not here to talk anyone out of it. But I am here to do the sums honestly, because the case for self-hosting is real and it does not need the inflated numbers we usually attach to it.

1 Electricity is the bill you forget

The hardware cost is a one-off you notice. The electricity is the cost you don’t, because it dribbles out a few pence at a time. So let’s actually measure it.

A box that idles at 40 watts and occasionally spikes higher will average, generously, around 50W over a day. The arithmetic is the same every time:

power (kW) x hours x days x price = annual cost

0.050 kW x 24 h x 365 days = 438 kWh/year
438 kWh x £0.28/kWh         = £122.64/year

That is one modest always-on machine. Add a NAS spinning eight drives, a second mini-PC, a managed switch and a UPS quietly wasting a few watts of its own, and a hundred-watt average is easy. At UK prices that is roughly £245 a year, every year, before you have hosted a single useful thing. A Raspberry Pi sips perhaps 4W and changes this maths entirely — which is rather the point of measuring rather than guessing.

2 Your time has a price even when you don’t charge it

The line item nobody puts in the spreadsheet is the hours. The initial build is fun, so we don’t count it. But self-hosting is not a purchase, it is a relationship, and relationships need maintenance.

Realistically, expect to spend time on:

• OS and container updates, and the occasional one that breaks something
• Certificate renewals that silently fail at the worst moment
• Backups, and the far rarer but more important act of testing a restore
• A drive that dies, a power cut that corrupts a database, an ISP that changes your IP

Even a tidy setup eats an hour or two a month once you account for the 3am “why is the reverse proxy returning 502” sessions. Call it twenty hours a year. You needn’t bill yourself consultant rates, but pretending the number is zero is how people end up resenting their own homelab.

3 So what do you actually save?

Now the other side of the ledger, honestly. Compare like for like against the SaaS you would otherwise pay for:

Stack a few of those and you are displacing perhaps £200–£350 a year of subscriptions. Against £245 of electricity and twenty hours of your life, the pure financial case is often a wash. If you are hosting one app to save a fiver a month, you are losing money and should feel no shame in admitting it.

4 Where the case genuinely holds up

The honest argument for self-hosting was never really about money, and the moment you stop pretending it is, the decision gets clearer. You self-host because:

• You’re already paying the fixed cost. Once the box is on for one thing, the marginal cost of the tenth service is nearly zero. Economies of consolidation are real.
• You own the data. No vendor deciding your photos now cost more, no service shutting down with ninety days’ notice, no quiet training of a model on your files.
• You learn things that have actual market value. The skills are transferable in a way a Netflix subscription is not.
• You enjoy it. This is allowed to be a reason. A workshop does not have to turn a profit.

5 The honest verdict

Self-hosting one or two services to save money is a bad trade once you price in power and time. Self-hosting a dozen, on hardware you already run, for the data ownership and the learning and the sheer pleasure of it — that is a fantastic trade, and the electricity bill is a hobby cost, not a saving.

So measure your watts, be honest about your hours, and then choose with your eyes open. Just stop telling yourself it’s free. It isn’t, and it doesn’t need to be.