Rent is easy. It's a fixed number, written in a lease, and everyone knows it before they move in. Utilities are where flatmate friendships go to die. The electricity bill doubles in winter, someone works from home with three monitors, and someone else showers for 40 minutes. By month three, nobody is sure who paid the internet bill, and everyone feels quietly cheated.
Here's how to split utilities with roommates fairly, which method to pick for your flat, and how to keep it from turning into a monthly argument.
Step 1: Agree on what counts as a "utility"
Before you split anything, write a list. Most flats share some mix of:
- Electricity
- Gas or heating
- Water and sewage
- Internet and Wi-Fi
- Streaming subscriptions
- Trash or building maintenance fees
- Shared household supplies (toilet paper, dish soap, cleaning products)
Decide together which of these are shared and which are personal. A streaming service only one person watches isn't a utility. It's their subscription. Getting this list agreed on day one prevents most fights later.
Step 2: Pick a split method that matches your flat
There's no single "fair" split. Fair means everyone agrees the method makes sense for how you actually live. These are the four methods that work.
1. Even split
Total bill divided by number of people. Simple, fast, and it works well when everyone has a similar room, a similar schedule and similar usage.
Best for: flats where people live similar lives, and bills that don't vary much, like internet.
2. Split by room size
If one person has the master bedroom with an en-suite and the others have small rooms, many flats split rent and heating by square footage. A 55/45 or 40/30/30 split is common.
Best for: flats with clearly unequal rooms, and heating and cooling costs, which scale with space.
3. Split by usage
When usage is very different, like one person working from home all day while others are out, split electricity by estimated usage. You don't need smart meters. A rough agreement such as "remote worker covers 40% of electricity, others split the rest" is enough.
Best for: electricity, when one person runs heavy equipment, a home office or a gaming PC.
4. Split by days present
If someone travels half the month, a fair approach is to weight their share by nights at home. This works best for variable bills like water and gas, not fixed ones like internet.
Best for: flats with frequent travellers or partners who stay over often.
Tip: you can mix methods. Many flats split internet evenly, heating by room size and electricity by usage. That's fine as long as it's written down.
Step 3: Decide who pays the provider
Usually one person's name is on each account. That person pays the full bill and everyone else pays them back. Problems start when:
- The account holder forgets to tell everyone the amount.
- People pay back at different times, or partially.
- Nobody remembers whether last month was settled.
Spreading accounts across people helps. One person holds electricity, another internet. That way no single person is fronting all the money.
Step 4: Track every bill in one shared place
This is the step most flats skip, and it's the one that matters most. Memory and WhatsApp scroll-back aren't a ledger. You need one place where:
- Every bill gets logged with the amount and who paid it.
- The agreed split is applied automatically.
- Everyone can see a running balance of who owes whom.
A shared spreadsheet works if someone is disciplined about it. Most flats find a simple app easier, because nobody has to maintain formulas.
IPaid was built for exactly this. You add a bill, choose an even or custom split (like 55/45), and everyone sees what they owe. You can share a public settle-up page with your flatmates on WhatsApp, and they can join the flat in one tap. It's free, with no card needed.
Step 5: Settle up on a fixed day
Pick a day, like the 1st of each month or the day rent is due, and settle all balances at once. A fixed date turns "can you pay me back?" from a personal request into a routine. Nobody has to be the nag.
Step 6: Review the split every few months
Life changes. Someone gets a remote job, someone's partner moves in half-time, winter arrives. Every three months, look at the numbers and ask: does this still feel fair? Adjusting early is far easier than resenting quietly for a year.
Common situations, and fair answers
"My roommate's partner basically lives here." If they're over more than three or four nights a week, it's reasonable to ask them to chip in on utilities. Water, electricity and supplies are the usual ones. Raise it early and frame it around the bills, not the person.
"One of us uses way more electricity." Agree a usage-based split for electricity only, and keep everything else even.
"Someone moved out mid-month." Pro-rate by days for variable bills. For fixed bills, follow whatever the move-out agreement says. If it says nothing, pro-rating is the fairest default.
"Someone keeps paying late." A shared, visible balance does most of the work here. When everyone can see the number, late payers usually catch up without a confrontation.
The short version
- List which bills are shared.
- Pick a split method per bill: even, room size, usage or days present.
- Spread the accounts so no one fronts everything.
- Log every bill in one shared place.
- Settle on a fixed day each month.
- Review every quarter.
Fairness between roommates isn't about perfect maths. It's about a method everyone agreed to, and a record nobody has to argue about.
Ready to stop doing bill maths in your head? Set up your flat on IPaid for free. It takes about two minutes, and your flatmates can join from a link.
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